Airworthiness Directives; McDonnell Douglas Corporation Model MD-11 and MD-11F Airplanes Equipped With General Electric CF6-80C2 Series Engines, 47203-47207 [2010-19156]

Download as PDF Federal Register / Vol. 75, No. 150 / Thursday, August 5, 2010 / Rules and Regulations the Federal Aviation Administration amends part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows: PART 39—AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: ■ Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. Section 39.13 is amended by adding a new airworthiness directive to read as follows: wwoods2 on DSK1DXX6B1PROD with RULES_PART 1 ■ 2010–15–03 Eurocopter France: Amendment 39–16369. Docket No. FAA–2010–0713; Directorate Identifier 2009–SW–63–AD. Applicability: Model EC 130 B4 helicopters that have been modified in accordance with MOD 073774, and have not had MOD 073591 nor the modification specified in Eurocopter Drawing No. 350A085340 incorporated, certificated in any category. Compliance: Required within 10 hours time-in-service (TIS), unless accomplished previously. To detect interference and prevent damage to an electrical harness by a lower structure fairing attachment screw (attachment screw), which could lead to short-circuiting of various warnings, inflation of the emergency floatation gear (emergency floats) during flight, and subsequent loss of control of the helicopter, accomplish the following: (a) Remove the lower forward right-hand, left-hand, and center fairings. (b) Inspect each electrical harness for chaffing, a tear, a hole, or other damage at the location of each attachment screw as depicted in Details B, C, and D in Figure 1 in Eurocopter Emergency Alert Service Bulletin No. 88A001 R1, dated April 17, 2007 (EASB), and as shown at point (a) in Figure 2 and Figure 3 in the EASB. (1) If there is no chaffing, tear, hole, or other damage to the electrical harness at any attachment screw: (i) Determine the length of each attachment screw that secures the fairings. Replace any attachment screw that is longer than 14mm with an airworthy attachment screw, part number (P/N) A0164TK050S014X; (ii) Install the spacer on the electrical harness in accordance with paragraph 2.B.3.a. of the Accomplishment Instructions of the EASB; (iii) Relocate the electrical harness on the cable holders in accordance with paragraph 2.B.3.b. of the Accomplishment Instructions of the EASB; and (iv) Install the harness clamp blocks in accordance with paragraph 2.B.4. of the Accomplishment Instructions of the EASB. (2) If there is chaffing, a tear, a hole, or other damage to an electrical harness at the location of an attachment screw, remove any protective tape from the electrical harness as shown at point (b) in Figure 2 of the EASB and inspect the insulation on each electrical wire and cable strand for chaffing, a tear, a hole, or other damage at the attachment screw location. VerDate Mar<15>2010 15:16 Aug 04, 2010 Jkt 220001 (i) If there is no chaffing, tear, hole, or other damage to the insulation on any wire or cable strand, wrap the electrical harness with protective tape and comply with paragraphs (b)(1)(i) through (b)(1)(iv) of this AD. (ii) If there is chaffing, a tear, a hole, or other damage to the insulation on any electrical wire or cable strand, but the electrical wire or cable strand is not damaged, wrap the electrical wire or cable strand that has damaged insulation with protective tape and wrap the electrical harness with protective tape, then comply with paragraphs (b)(1)(i) through (b)(1)(iv) of this AD. (c) If 3 or less electrical wires or cable strands in the same immediate area are damaged: (1) Repair each damaged electrical wire or cable strand with an extension lead, P/N E0541–10, in accordance with the Appendix to the EASB; test the electrical continuity of the repaired electrical wire or cable strand using an ohmmeter, continuity test light, or equivalent device; and functionally test the system affected by the repair; (2) Wrap the electrical harness with protective tape; and (3) Comply with paragraphs (b)(1)(i) through (b)(1)(iv) of this AD. (d) If 4 or more electrical wires or cable strands in the same immediate area are damaged: (1) Contact the Safety Management Group, Rotorcraft Directorate, FAA, ATTN: George Schwab, Aviation Safety Engineer, 2601 Meacham Blvd., Fort Worth, Texas, 76137, telephone (817) 222–5114, fax (817) 222– 5961, for an approved electrical conductor repair procedure; and (2) Comply with (b)(1)(i) through (b)(1)(iv) of this AD. (e) Reinstall the fairings. (f) Contact the Manager, Safety Management Group, Rotorcraft Directorate, FAA, ATTN: George Schwab, Aviation Safety Engineer, 2601 Meacham Blvd., Fort Worth, Texas, 76137, telephone (817) 222–5114, fax (817) 222–5961, for information about previously approved alternative methods of compliance. (g) The Joint Aircraft System/Component (JASC) Code is 3297: Landing Gear System Wiring. (h) The inspections, modifications and repairs, if needed, shall be done in accordance with the specified portions of Eurocopter Emergency Alert Service Bulletin No. 88A001 R1, dated April 17, 2007. The Director of the Federal Register approved this incorporation by reference in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from American Eurocopter Corporation, 2701 Forum Drive, Grand Prairie, TX 75053–4005, telephone (800) 232–0323, fax (972) 641–3710, or at https://www.eurocopter.com. Copies may be inspected at the FAA, Office of the Regional Counsel, Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202–741–6030, or go to: https://www.archives. gov/federal_register/code_of_federal_ regulations/ibr_locations.html. PO 00000 Frm 00033 Fmt 4700 Sfmt 4700 47203 (i) This amendment becomes effective on August 20, 2010. Note: The subject of this AD is addressed in European Aviation Safety Agency (France) AD No. 2006–0344 R1, dated May 10, 2007, which revises European Aviation Safety Agency Emergency AD No. 2006–0344–E, dated November 13, 2006. Issued in Fort Worth, Texas, on July 8, 2010. Scott A. Horn, Acting Manager, Rotorcraft Directorate, Aircraft Certification Service. [FR Doc. 2010–17282 Filed 8–4–10; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2008–0403; Directorate Identifier 2007–NM–166–AD; Amendment 39–16379; AD 2010–16–03] RIN 2120–AA64 Airworthiness Directives; McDonnell Douglas Corporation Model MD–11 and MD–11F Airplanes Equipped With General Electric CF6–80C2 Series Engines Federal Aviation Administration (FAA), DOT. ACTION: Final rule. AGENCY: We are adopting a new airworthiness directive (AD) for certain Model MD–11 and MD–11F airplanes. This AD requires revising the airplane flight manual to advise the flightcrew to use certain procedures during descent in certain icing conditions. This AD results from reports of several in-flight engine flameouts, including multiple dual engine flameout events, in icecrystal icing conditions. We are issuing this AD to ensure that the flightcrew has the proper procedures to follow in certain icing conditions. These certain icing conditions could cause a multiple engine flameout during flight with the potential inability to restart the engines, and consequent forced landing of the airplane. SUMMARY: DATES: This AD is effective September 9, 2010. Examining the AD Docket You may examine the AD docket on the Internet at https:// www.regulations.gov; or in person at the Docket Management Facility between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this AD, the regulatory evaluation, any comments received, and E:\FR\FM\05AUR1.SGM 05AUR1 47204 Federal Register / Vol. 75, No. 150 / Thursday, August 5, 2010 / Rules and Regulations other information. The address for the Docket Office (telephone 800–647–5527) is the Document Management Facility, U.S. Department of Transportation, Docket Operations, M–30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590. FOR FURTHER INFORMATION CONTACT: Samuel Lee, Aerospace Engineer, Propulsion Branch, ANM–140L, FAA, Los Angeles Aircraft Certification Office, 3960 Paramount Boulevard, Lakewood, California 90712–4137; telephone (562) 627–5262; fax (562) 627–5210. SUPPLEMENTARY INFORMATION: Discussion We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to include an airworthiness directive (AD) that would apply to certain Model MD–11 and MD–11F airplanes. That NPRM was published in the Federal Register on April 7, 2008 (73 FR 18719). That NPRM proposed to require revising the airplane flight manual (AFM) to advise the flightcrew to use certain procedures during descent in certain icing conditions. Other Relevant Proposed Rulemaking NPRM, Docket No. FAA–2008–0402, Directorate Identifier 2007–NM–165–AD (73 FR 18721, April 7, 2008), proposes to require similar actions for Model 747 airplanes and Model 767 airplanes, certified in any category, equipped with General Electric Model CF6–80C2 or CF6–80A series engines. These airplanes have been determined to be subject to the identified unsafe condition addressed in this AD. wwoods2 on DSK1DXX6B1PROD with RULES_PART 1 Comments We gave the public the opportunity to participate in developing this AD. We considered the comments received. Support for the NPRM The Air Line Pilots Association, International supports the intent and language of the NPRM. The National Transportation Safety Board (NTSB), based on the success of similar AFM requirements to address this unsafe condition on Hawker Beechcraft Corporation Model 400, 400A, and 400T series airplanes and Model MU–300 airplanes, supports the adoption of the proposed requirements. Request for FAA To Actively Pursue Research To Develop a Permanent Solution The NTSB notes that the NPRM is intended as interim action, and points out that it has issued Safety VerDate Mar<15>2010 15:16 Aug 04, 2010 Jkt 220001 Recommendation A–06–59, dated August 25, 2006. In this safety recommendation the NTSB asked the FAA to ‘‘* * * work with engine and airplane manufacturers and other industry personnel as well as the appropriate international airworthiness authorities to actively pursue research to develop an ice detector that would alert pilots to internal engine icing and require that it be installed on new production turbojet engines, as well as retrofitted to existing turbojet engines.’’ Therefore, the NTSB hopes the FAA pursues research in concert with the multinational Aircraft Icing Research Alliance that might develop an ice detector to alert flightcrews to the accretion of ice crystals on internal engine surfaces, so that flightcrews can take the appropriate actions. We partially agree with the commenter’s request. We agree that the General Electric (GE) CF6–80C2 series engine needs to be modified to mitigate the risk of flameouts caused by ice crystal accretion. However, at this time, we do not agree to pursue research to develop an ice detector that would alert flightcrews to the internal engine icing, or with requiring manufacturers to install ice detectors internal to the engines. In addition, no such designs have been proposed to the FAA. Instead, for future designs, we are developing rulemaking to show acceptable engine operation in an ice crystal environment. For engines that currently demonstrate a susceptibility to ice crystals, we are working with manufacturers to develop engine design changes to make engines more robust during ice crystal accumulation and shedding encounters. We will continue to provide feedback to the NTSB through the established process for addressing safety recommendations. For this AD, if different methods to address the unsafe condition are developed, under the provisions of paragraph (h) of this AD, we will consider requests for approval of an AMOC if sufficient data are submitted to substantiate that the method would provide an acceptable level of safety. No change to the AD is necessary in this regard. Request To Require Demonstration of Non-Susceptibility in Future Designs The NTSB states that it hopes the FAA will require future engine designs to demonstrate that they will not be susceptible to the accretion of ice crystals on internal surfaces. The NTSB points out that this request is in keeping with information provided to the NTSB by an FAA icing expert during a briefing with the Safety Board. PO 00000 Frm 00034 Fmt 4700 Sfmt 4700 From these statements, we infer that the NTSB is requesting that we revise the NPRM to include a statement of our intent to require manufacturers to demonstrate that future engine designs are not susceptible to the accretion of ice crystals. We partially agree. We agree that current FAA regulations addressing engine and airplane icing do not apply to the ice crystal environment; therefore, we are working with the aviation industry to develop appropriate regulations that address operation in an ice crystal environment. As we determine the necessary requirements to address this issue, we will consider additional rulemaking. We do not agree to revise this AD to include a statement regarding future regulations that have not yet been determined. No change to the AD is necessary in this regard. Request To Withdraw the NPRM GE acknowledges that a small number of inclement weather or significant weather system encounters have resulted in short-duration multiple engine power loss. GE points out that these few events occurred out of 14 million flights over 20 years of total service experience on the Model CF6– 80C2 series engine. GE states that a forced landing resulting from one of these in-flight ice-crystal icing events is extremely improbable (including demonstrated relight performance). Therefore, GE asserts that the proposed condition does not meet the definition of ‘‘unsafe condition,’’ as defined by FAA Advisory Circular 39–8, ‘‘Continued Airworthiness Assessments of Powerplant and Auxiliary Power Unit Installations of Transport Category Airplanes,’’ dated September 8, 2003. From these statements, we infer that GE requests that we withdraw the NPRM. We do not agree. We have evaluated the unsafe condition and find that sufficient data exist to demonstrate that the environment that causes the engine flameout would likely cause engine damage that potentially would prevent an engine from relighting. The condition could exist on all of an airplane’s engines, resulting in a forced landing. The advisory circular referenced by the commenter merely provides guidance. We have determined that an unsafe condition exists, and the appropriate vehicle for correcting an unsafe condition is an AD. We have not changed the AD regarding this issue. Request To Revise Wording of the Unsafe Condition Boeing proposes that we revise the wording of the unsafe condition from, ‘‘These certain icing conditions could cause a multiple engine flameout during E:\FR\FM\05AUR1.SGM 05AUR1 Federal Register / Vol. 75, No. 150 / Thursday, August 5, 2010 / Rules and Regulations wwoods2 on DSK1DXX6B1PROD with RULES_PART 1 flight without the ability of the engines to be relit * * *’’ to ‘‘These certain icing conditions may cause a multiple engine flameout during flight, with the potential inability to restart the engines * * *.’’ Boeing asserts that the wording in the NPRM overly conveys the likelihood of not being able to restart the engine(s) after flameout. While the possibility exists, Boeing confirms that all engines involved in all of the flameout events to date have been restarted in flight with subsequent normal landings. We agree. We acknowledge that none of the flameout events on this engine model to date have resulted in a forced landing due to the inability to restart the engines. We agree that the inability to restart the engines following flameout is possible, not probable. Therefore, we have revised the unsafe condition statement in the Summary section and paragraph (e) of this AD (specified as paragraph (d) of the NPRM) as proposed by Boeing. Requests To Revise Wording in the Discussion Section of the NPRM Boeing proposes that we revise the Discussion section of the NPRM to state that there have been seven engine flameout events, not six. Boeing states that it has received seven reports of flameout events on Model MD–11 airplanes due to ice-crystal icing conditions. We acknowledge that Boeing has received seven reports, instead of the six specified in the NPRM. However, the Discussion section of the NPRM is not restated in the final rule; therefore, no change to the AD is necessary in this regard. GE suggests that we revise the wording of the Discussion section of the NPRM to remove the word ‘‘core,’’ or, if that is not acceptable, to change ‘‘core flow path’’ to ‘‘booster and core flow path.’’ GE points out that the term ‘‘core’’ can be interpreted to mean just the highpressure spool portion of a turbofan. We partially agree. We do not agree with GE’s suggestion to remove the word ‘‘core’’ from the Discussion section. We do agree that the phrase ‘‘booster and core flow path’’ is more accurate; however, because the Discussion section of the NPRM is not restated in this AD, there is no need to revise the AD in this regard. GE suggests that we revise the Discussion section of the NPRM to change the word ‘‘usually’’ to ‘‘often’’ in the following sentence: ‘‘Therefore, it [ice-crystal icing] is usually undetected by the flightcrew.’’ GE states that this change would make the NPRM consistent with a similar NPRM VerDate Mar<15>2010 15:16 Aug 04, 2010 Jkt 220001 (Directorate Identifier 2007–NM–165– AD, Docket FAA–2008–0402 (73 FR 18721, April 7, 2008)), which addresses the same unsafe condition on certain Model 747 and 767 airplanes. From this statement, we infer that GE is requesting that we revise the Discussion section of the NPRM to clarify that ice-crystal icing is often undetected by the flightcrew, not usually undetected. We partially agree. We agree that the wording change suggested by GE would make this AD consistent with a similar NPRM that addresses the same unsafe condition on certain Model 747 and 767 airplanes. However, as previously noted, the Discussion section in the NPRM is not restated in this AD, therefore, there is no need to revise the AD in this regard. Requests To Revise the Costs of Compliance Section of the NPRM GE suggests that there should be an operational cost of compliance included in the proposed Costs of Compliance provided in the NPRM. GE states that, while increasing engine off-take or bleed does provide additional margin against flameout, doing so requires somewhat increased fuel burn. GE believes the proposed procedure would be required on a significant percentage of flights. Federal Express (FedEx) believes that the total cost of the NPRM has either not been fully considered, or has not been properly communicated. FedEx asserts that the cost of using wing and tail antiice increases fuel burn and exposes the airplane to additional reliability risks associated with increased use of the anti-ice system, while only providing a small incremental amount of effectiveness. FedEx also states that it estimates the increased fuel consumption to be 40 pounds for a descent from flight level (FL) 400 to landing. From these statements, we infer that GE and FedEx are requesting that we revise the Costs of Compliance section of the NPRM to provide an operational cost for increased fuel burn necessitated by use of the proposed AFM procedure. We do not agree. The cost information in AD actions describes only the direct costs of the specific action required by the AD: an AFM revision in this case. The estimated cost of this action represents the time necessary to perform only the actions actually required by this AD. We recognize that, in doing the actions required by an AD, operators might incur operational costs in addition to the direct costs. The cost analysis in AD rulemaking actions, however, typically does not include incidental or operational costs such as the time required for planning or other PO 00000 Frm 00035 Fmt 4700 Sfmt 4700 47205 administrative actions, and, in this case, possible additional fuel costs. Those costs, which might vary significantly among operators, are almost impossible to calculate. Additionally, we have determined that the additional fuel burn necessitated by the AFM procedure would be insignificant. However, as we explain under ‘‘Request to Revise the Proposed AFM Text,’’ we have revised the procedure to allow the ANTI–ICE switches to be placed in the OFF position when icing conditions are no longer present or anticipated. This allowance will further reduce any additional fuel burn caused by the use of the anti-ice system. We have not changed the Costs of Compliance section of this AD in this regard. Request To Include Alternative AFM Requirements FedEx recommends that we revise the NPRM to allow alternative AFM requirements based on the full authority digital engine control (FADEC) electronic control unit (ECU) installed software version. FedEx states that GE has documented six flameout events suspected to be a result of ice-crystal accretion. FedEx points out that GE Service Bulletin 73–21–07, Engine fuel and control—Electronic Control Unit Introduction of Software Version 8.3.K (8322), was introduced to improve the flameout margin in ice-crystal conditions. FedEx explains that this software change will create new engine control configurations with enhanced variable bypass valve (VBV) scheduling logic for inclement weather, and will change the scheduling of the VBVs at high altitude to increase ice extraction from the booster-core flowpath transition to the fan exit stream. FedEx believes there have been no suspected flameout events on airplanes using the combination of engine anti-ice and ECU software version 8.3.K on Model MD– 11s, and indicates that it is upgrading its fleet to ECU software version 8.3.K in accordance with AD 2007–22–07, Amendment 39–15243 (72 FR 60227, October 24, 2007), applicable to GE CF6–80C2D1F turbofan engines. Therefore, FedEx proposes that airplanes with ECU software version 8.3.J or previous should follow the AFM requirement proposed in the NPRM, and airplanes with software version 8.3.K or subsequent should be allowed to follow alternative AFM requirements. FedEx provides suggested wording for an alternative AFM requirement. We do not agree to revise this AD to allow alternative AFM requirements based on the installed software version. Based on a recent multiple engine flameout incident on a Model 747–400 E:\FR\FM\05AUR1.SGM 05AUR1 47206 Federal Register / Vol. 75, No. 150 / Thursday, August 5, 2010 / Rules and Regulations airplane equipped with CF6–80C2B1F engines and ECU software equivalent to the version 8.3.K, we have determined that ECU software version 8.3.K alone will not necessarily provide an adequate margin of safety against engine flameout in all environments. We note that the nacelle anti-ice had been switched on prior to engine flameout. Increasing the bleed flow and engine idle speed by placing the ENG, WING, and TAIL ANTI-ICE switches in the ON position will provide additional margin for engine flameout. We have not revised the AD in this regard. Request To Remove Part of the AFM Requirement FedEx requests that additional justification be made available to support the proposed AFM requirement to use wing and tail anti-ice systems. FedEx states that both its flight operations and engineering staffs agree that increasing the flameout margin to buffer against possible core shedding of ice-crystal accretion is an important requirement, and fully support activation of the ENG IGN OVRD switch and engine anti-ice as effective means of reducing flameouts. However, FedEx feels strongly that part of the proposed AFM requirement is of limited value and might not be justifiable. FedEx asserts that selection of wing anti-ice would result in a small or incremental increase in core temperature, while increasing fuel flow and unnecessarily exposing the airplane to additional reliability risks. FedEx further notes that the NTSB, in its comments to the NPRM, made no mention of wing and tail anti-ice systems being part of the successful recommendations on Model 400A airplanes. We do not agree to remove the requirement to use wing and tail antiice. As discussed previously, despite having the nacelle anti-ice switched on, a Model 747–400 airplane experienced a multiple engine flameout. Therefore, the use of nacelle anti-ice alone is not sufficient to prevent a multiple engine flameout. Increasing the bleed flow and engine idle speed by placing the ENG, WING, and TAIL ANTI-ICE switches in the ON position will provide additional margin against engine flameout. We have not revised the AD in this regard. Request To Revise the Proposed AFM Text Boeing proposes that we revise the proposed AFM text provided in the NPRM as follows: Prior to reducing thrust for descent, when icing conditions (defined by visible moisture in the air and TAT is 6 Deg C or below) are present, the ENG IGN OVRD switch and the ENG, WING, and TAIL ANTI-ICE switches must be placed in the ON position. When icing conditions are no longer present or anticipated, place the ENG IGN OVRD switch and the ENG, WING, and TAIL ANTI-ICE switches in the OFF position. Boeing states that this AFM text provides additional procedural information, as noted in the current Interim Operating Procedures for icing conditions that exist or are anticipated prior to descent. We agree that the AFM text changes suggested by Boeing do provide helpful procedural information. We have also determined that there is no additional benefit to having the engine, wing, and tail anti-ice switched on once icing conditions are no longer present or anticipated. Therefore, we have revised the AFM text provided in paragraph (g) of this AD (specified in paragraph (f) of the NPRM) to include the supplemental procedural information provided by Boeing, and to allow engine, wing, and tail anti-ice to be switched off once icing conditions are no longer present or anticipated. Explanation of Additional Paragraph in This AD We have added a new paragraph (d) to this AD to provide the Air Transport Association (ATA) of America subject code 30: Ice and rain protection. This code is added to make this AD parallel with other new AD actions. We have reidentified subsequent paragraphs accordingly. Explanation of Additional Change Made to the AD We have revised this AD to identify the legal name of the manufacturer as published in the most recent type certificate data sheet for the affected airplane models. Conclusion We reviewed the relevant data, considered the comments received, and determined that air safety and the public interest require adopting the AD with the changes described previously. We also determined that these changes will not increase the economic burden on any operator or increase the scope of the AD. Interim Action We consider this AD interim action. If final action is later identified, we might consider further rulemaking then. Explanation of Change to Costs of Compliance Since issuance of the original NPRM, we have increased the labor rate used in the Costs of Compliance from $80 per work-hour to $85 per work-hour. The Costs of Compliance information, below, reflects this increase in the specified hourly labor rate. Costs of Compliance There are about 118 airplanes of the affected design in the worldwide fleet. The following table provides the estimated costs for U.S. operators to comply with this AD. ESTIMATED COSTS Work hours Average labor rate per hour Parts Cost per airplane Number of U.S.-registered airplanes Fleet cost AFM revision ............................................ wwoods2 on DSK1DXX6B1PROD with RULES_PART 1 Action 1 $85 $0 $85 70 $5,950 Authority for This Rulemaking Title 49 of the United States Code specifies the FAA’s authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. ‘‘Subtitle VII: Aviation Programs,’’ describes in more VerDate Mar<15>2010 15:16 Aug 04, 2010 Jkt 220001 detail the scope of the Agency’s authority. We are issuing this rulemaking under the authority described in ‘‘Subtitle VII, Part A, Subpart III, Section 44701: General requirements.’’ Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in PO 00000 Frm 00036 Fmt 4700 Sfmt 4700 air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on E:\FR\FM\05AUR1.SGM 05AUR1 Federal Register / Vol. 75, No. 150 / Thursday, August 5, 2010 / Rules and Regulations products identified in this rulemaking action. Regulatory Findings This AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government. For the reasons discussed above, I certify that this AD: (1) Is not a ‘‘significant regulatory action’’ under Executive Order 12866, (2) Is not a ‘‘significant rule’’ under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979), and (3) Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. You can find our regulatory evaluation and the estimated costs of compliance in the AD Docket. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Safety. Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: ■ PART 39—AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: ■ Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. The FAA amends § 39.13 by adding the following new AD: ■ 2010–16–03 McDonnell Douglas Corporation: Amendment 39–16379. Docket No. FAA–2008–0403; Directorate Identifier 2007–NM–166–AD. Effective Date (a) This airworthiness directive (AD) is effective September 9, 2010. wwoods2 on DSK1DXX6B1PROD with RULES_PART 1 Affected ADs (b) None. Applicability (c) This AD applies to McDonnell Douglas Corporation Model MD–11 and MD–11F airplanes, certified in any category, equipped with General Electric CF6–80C2 series engines. Subject (d) Air Transport Association (ATA) of America Code 30: Ice and rain protection. VerDate Mar<15>2010 15:16 Aug 04, 2010 Jkt 220001 Unsafe Condition (e) This AD results from reports of several in-flight engine flameouts, including multiple dual engine flameout events, in icecrystal icing conditions. We are issuing this AD to ensure that the flightcrew has the proper procedures to follow in certain icing conditions. These certain icing conditions could cause a multiple engine flameout during flight with the potential inability to restart the engines, and consequent forced landing of the airplane. 47207 Issued in Renton, Washington on July 16, 2010. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 2010–19156 Filed 8–4–10; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration Compliance 14 CFR Part 39 (f) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. [Docket No. FAA–2009–1215; Directorate Identifier 2009–NM–126–AD; Amendment 39–16364; AD 2010–14–19] Airplane Flight Manual (AFM) Revision (g) Within 14 days after the effective date of this AD, revise the Limitations Section of the McDonnell Douglas MD–11/MD–11F AFM to include the following statement. This may be done by inserting a copy of this AD into the AFM. ‘‘Prior to reducing thrust for descent when icing conditions (defined by visible moisture in the air and TAT is 6 °C or below) are present, the ENG IGN OVRD switch and the ENG, WING, and TAIL ANTI-ICE switches must be placed in the ON position. When icing conditions are no longer present or anticipated, place the ENG IGN OVRD switch and the ENG, WING, and TAIL ANTI-ICE switches in the OFF position.’’ Note 1: When a statement identical to that in paragraph (g) of this AD has been included in the general revisions of the AFM, the general revisions may be inserted into the AFM, and the copy of this AD may be removed from the AFM. Alternative Methods of Compliance (AMOCs) (h)(1) The Manager, Los Angeles Aircraft Certification Office (ACO), FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Samuel Lee, Aerospace Engineer, Propulsion Branch, ANM–140L, FAA, Los Angeles Aircraft Certification Office, 3960 Paramount Boulevard, Lakewood, California 90712– 4137; telephone (562) 627–5262; fax (562) 627–5210. (2) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. Before using any approved AMOC on any airplane to which the AMOC applies, notify your principal maintenance inspector (PMI) or principal avionics inspector (PAI), as appropriate, or lacking a principal inspector, your local Flight Standards District Office. The AMOC approval letter must specifically reference this AD. Material Incorporated by Reference (i) None. PO 00000 Frm 00037 Fmt 4700 Sfmt 4700 RIN 2120–AA64 Airworthiness Directives; Airbus Model A330–200 and –300 Series Airplanes, and Model A340–200, –300, –500 and –600 Series Airplanes Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Final rule; correction. AGENCY: The FAA is correcting airworthiness directive (AD) 2010–14– 19, which published in the Federal Register on July 13, 2010. That AD applies to certain Model A330–200 and –300 series airplanes, and Model A340– 200, –300, –500 and –600 series airplanes. A certain service bulletin number in Note 3 of the regulatory section is incorrect. This document corrects that service bulletin number. In all other respects, the original document remains the same. DATES: This correction is effective August 5, 2010. The effective date of AD 2010–14–19 remains August 17, 2010. ADDRESSES: You may examine the AD docket on the Internet at https:// www.regulations.gov; or in person at the Docket Management Facility between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this AD, the regulatory evaluation, any comments received, and other information. The address for the Docket Office (telephone 800–647–5527) is the Document Management Facility, U.S. Department of Transportation, Docket Operations, M–30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590. FOR FURTHER INFORMATION CONTACT: Vladimir Ulyanov, Aerospace Engineer, International Branch, ANM–116, Transport Airplane Directorate, FAA, 1601 Lind Avenue, SW., Renton, Washington 98057–3356; telephone (425) 227–1138; fax (425) 227–1149. SUMMARY: E:\FR\FM\05AUR1.SGM 05AUR1

Agencies

[Federal Register Volume 75, Number 150 (Thursday, August 5, 2010)]
[Rules and Regulations]
[Pages 47203-47207]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2010-19156]


-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-0403; Directorate Identifier 2007-NM-166-AD; 
Amendment 39-16379; AD 2010-16-03]
RIN 2120-AA64


Airworthiness Directives; McDonnell Douglas Corporation Model MD-
11 and MD-11F Airplanes Equipped With General Electric CF6-80C2 Series 
Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: We are adopting a new airworthiness directive (AD) for certain 
Model MD-11 and MD-11F airplanes. This AD requires revising the 
airplane flight manual to advise the flightcrew to use certain 
procedures during descent in certain icing conditions. This AD results 
from reports of several in-flight engine flameouts, including multiple 
dual engine flameout events, in ice-crystal icing conditions. We are 
issuing this AD to ensure that the flightcrew has the proper procedures 
to follow in certain icing conditions. These certain icing conditions 
could cause a multiple engine flameout during flight with the potential 
inability to restart the engines, and consequent forced landing of the 
airplane.

DATES: This AD is effective September 9, 2010.

Examining the AD Docket

    You may examine the AD docket on the Internet at https://www.regulations.gov; or in person at the Docket Management Facility 
between 9 a.m. and 5 p.m., Monday through Friday, except Federal 
holidays. The AD docket contains this AD, the regulatory evaluation, 
any comments received, and

[[Page 47204]]

other information. The address for the Docket Office (telephone 800-
647-5527) is the Document Management Facility, U.S. Department of 
Transportation, Docket Operations, M-30, West Building Ground Floor, 
Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Samuel Lee, Aerospace Engineer, 
Propulsion Branch, ANM-140L, FAA, Los Angeles Aircraft Certification 
Office, 3960 Paramount Boulevard, Lakewood, California 90712-4137; 
telephone (562) 627-5262; fax (562) 627-5210.

SUPPLEMENTARY INFORMATION: 

Discussion

    We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR 
part 39 to include an airworthiness directive (AD) that would apply to 
certain Model MD-11 and MD-11F airplanes. That NPRM was published in 
the Federal Register on April 7, 2008 (73 FR 18719). That NPRM proposed 
to require revising the airplane flight manual (AFM) to advise the 
flightcrew to use certain procedures during descent in certain icing 
conditions.

Other Relevant Proposed Rulemaking

    NPRM, Docket No. FAA-2008-0402, Directorate Identifier 2007-NM-165-
AD (73 FR 18721, April 7, 2008), proposes to require similar actions 
for Model 747 airplanes and Model 767 airplanes, certified in any 
category, equipped with General Electric Model CF6-80C2 or CF6-80A 
series engines. These airplanes have been determined to be subject to 
the identified unsafe condition addressed in this AD.

Comments

    We gave the public the opportunity to participate in developing 
this AD. We considered the comments received.

Support for the NPRM

    The Air Line Pilots Association, International supports the intent 
and language of the NPRM. The National Transportation Safety Board 
(NTSB), based on the success of similar AFM requirements to address 
this unsafe condition on Hawker Beechcraft Corporation Model 400, 400A, 
and 400T series airplanes and Model MU-300 airplanes, supports the 
adoption of the proposed requirements.

Request for FAA To Actively Pursue Research To Develop a Permanent 
Solution

    The NTSB notes that the NPRM is intended as interim action, and 
points out that it has issued Safety Recommendation A-06-59, dated 
August 25, 2006. In this safety recommendation the NTSB asked the FAA 
to ``* * * work with engine and airplane manufacturers and other 
industry personnel as well as the appropriate international 
airworthiness authorities to actively pursue research to develop an ice 
detector that would alert pilots to internal engine icing and require 
that it be installed on new production turbojet engines, as well as 
retrofitted to existing turbojet engines.'' Therefore, the NTSB hopes 
the FAA pursues research in concert with the multinational Aircraft 
Icing Research Alliance that might develop an ice detector to alert 
flightcrews to the accretion of ice crystals on internal engine 
surfaces, so that flightcrews can take the appropriate actions.
    We partially agree with the commenter's request. We agree that the 
General Electric (GE) CF6-80C2 series engine needs to be modified to 
mitigate the risk of flameouts caused by ice crystal accretion. 
However, at this time, we do not agree to pursue research to develop an 
ice detector that would alert flightcrews to the internal engine icing, 
or with requiring manufacturers to install ice detectors internal to 
the engines. In addition, no such designs have been proposed to the 
FAA. Instead, for future designs, we are developing rulemaking to show 
acceptable engine operation in an ice crystal environment. For engines 
that currently demonstrate a susceptibility to ice crystals, we are 
working with manufacturers to develop engine design changes to make 
engines more robust during ice crystal accumulation and shedding 
encounters. We will continue to provide feedback to the NTSB through 
the established process for addressing safety recommendations. For this 
AD, if different methods to address the unsafe condition are developed, 
under the provisions of paragraph (h) of this AD, we will consider 
requests for approval of an AMOC if sufficient data are submitted to 
substantiate that the method would provide an acceptable level of 
safety. No change to the AD is necessary in this regard.

Request To Require Demonstration of Non-Susceptibility in Future 
Designs

    The NTSB states that it hopes the FAA will require future engine 
designs to demonstrate that they will not be susceptible to the 
accretion of ice crystals on internal surfaces. The NTSB points out 
that this request is in keeping with information provided to the NTSB 
by an FAA icing expert during a briefing with the Safety Board.
    From these statements, we infer that the NTSB is requesting that we 
revise the NPRM to include a statement of our intent to require 
manufacturers to demonstrate that future engine designs are not 
susceptible to the accretion of ice crystals. We partially agree. We 
agree that current FAA regulations addressing engine and airplane icing 
do not apply to the ice crystal environment; therefore, we are working 
with the aviation industry to develop appropriate regulations that 
address operation in an ice crystal environment. As we determine the 
necessary requirements to address this issue, we will consider 
additional rulemaking. We do not agree to revise this AD to include a 
statement regarding future regulations that have not yet been 
determined. No change to the AD is necessary in this regard.

Request To Withdraw the NPRM

    GE acknowledges that a small number of inclement weather or 
significant weather system encounters have resulted in short-duration 
multiple engine power loss. GE points out that these few events 
occurred out of 14 million flights over 20 years of total service 
experience on the Model CF6-80C2 series engine. GE states that a forced 
landing resulting from one of these in-flight ice-crystal icing events 
is extremely improbable (including demonstrated relight performance). 
Therefore, GE asserts that the proposed condition does not meet the 
definition of ``unsafe condition,'' as defined by FAA Advisory Circular 
39-8, ``Continued Airworthiness Assessments of Powerplant and Auxiliary 
Power Unit Installations of Transport Category Airplanes,'' dated 
September 8, 2003.
    From these statements, we infer that GE requests that we withdraw 
the NPRM. We do not agree. We have evaluated the unsafe condition and 
find that sufficient data exist to demonstrate that the environment 
that causes the engine flameout would likely cause engine damage that 
potentially would prevent an engine from relighting. The condition 
could exist on all of an airplane's engines, resulting in a forced 
landing. The advisory circular referenced by the commenter merely 
provides guidance. We have determined that an unsafe condition exists, 
and the appropriate vehicle for correcting an unsafe condition is an 
AD. We have not changed the AD regarding this issue.

Request To Revise Wording of the Unsafe Condition

    Boeing proposes that we revise the wording of the unsafe condition 
from, ``These certain icing conditions could cause a multiple engine 
flameout during

[[Page 47205]]

flight without the ability of the engines to be relit * * *'' to 
``These certain icing conditions may cause a multiple engine flameout 
during flight, with the potential inability to restart the engines * * 
*.'' Boeing asserts that the wording in the NPRM overly conveys the 
likelihood of not being able to restart the engine(s) after flameout. 
While the possibility exists, Boeing confirms that all engines involved 
in all of the flameout events to date have been restarted in flight 
with subsequent normal landings.
    We agree. We acknowledge that none of the flameout events on this 
engine model to date have resulted in a forced landing due to the 
inability to restart the engines. We agree that the inability to 
restart the engines following flameout is possible, not probable. 
Therefore, we have revised the unsafe condition statement in the 
Summary section and paragraph (e) of this AD (specified as paragraph 
(d) of the NPRM) as proposed by Boeing.

Requests To Revise Wording in the Discussion Section of the NPRM

    Boeing proposes that we revise the Discussion section of the NPRM 
to state that there have been seven engine flameout events, not six. 
Boeing states that it has received seven reports of flameout events on 
Model MD-11 airplanes due to ice-crystal icing conditions.
    We acknowledge that Boeing has received seven reports, instead of 
the six specified in the NPRM. However, the Discussion section of the 
NPRM is not restated in the final rule; therefore, no change to the AD 
is necessary in this regard.
    GE suggests that we revise the wording of the Discussion section of 
the NPRM to remove the word ``core,'' or, if that is not acceptable, to 
change ``core flow path'' to ``booster and core flow path.'' GE points 
out that the term ``core'' can be interpreted to mean just the high-
pressure spool portion of a turbofan.
    We partially agree. We do not agree with GE's suggestion to remove 
the word ``core'' from the Discussion section. We do agree that the 
phrase ``booster and core flow path'' is more accurate; however, 
because the Discussion section of the NPRM is not restated in this AD, 
there is no need to revise the AD in this regard.
    GE suggests that we revise the Discussion section of the NPRM to 
change the word ``usually'' to ``often'' in the following sentence: 
``Therefore, it [ice-crystal icing] is usually undetected by the 
flightcrew.'' GE states that this change would make the NPRM consistent 
with a similar NPRM (Directorate Identifier 2007-NM-165-AD, Docket FAA-
2008-0402 (73 FR 18721, April 7, 2008)), which addresses the same 
unsafe condition on certain Model 747 and 767 airplanes.
    From this statement, we infer that GE is requesting that we revise 
the Discussion section of the NPRM to clarify that ice-crystal icing is 
often undetected by the flightcrew, not usually undetected. We 
partially agree. We agree that the wording change suggested by GE would 
make this AD consistent with a similar NPRM that addresses the same 
unsafe condition on certain Model 747 and 767 airplanes. However, as 
previously noted, the Discussion section in the NPRM is not restated in 
this AD, therefore, there is no need to revise the AD in this regard.

Requests To Revise the Costs of Compliance Section of the NPRM

    GE suggests that there should be an operational cost of compliance 
included in the proposed Costs of Compliance provided in the NPRM. GE 
states that, while increasing engine off-take or bleed does provide 
additional margin against flameout, doing so requires somewhat 
increased fuel burn. GE believes the proposed procedure would be 
required on a significant percentage of flights.
    Federal Express (FedEx) believes that the total cost of the NPRM 
has either not been fully considered, or has not been properly 
communicated. FedEx asserts that the cost of using wing and tail anti-
ice increases fuel burn and exposes the airplane to additional 
reliability risks associated with increased use of the anti-ice system, 
while only providing a small incremental amount of effectiveness. FedEx 
also states that it estimates the increased fuel consumption to be 40 
pounds for a descent from flight level (FL) 400 to landing.
    From these statements, we infer that GE and FedEx are requesting 
that we revise the Costs of Compliance section of the NPRM to provide 
an operational cost for increased fuel burn necessitated by use of the 
proposed AFM procedure. We do not agree. The cost information in AD 
actions describes only the direct costs of the specific action required 
by the AD: an AFM revision in this case. The estimated cost of this 
action represents the time necessary to perform only the actions 
actually required by this AD. We recognize that, in doing the actions 
required by an AD, operators might incur operational costs in addition 
to the direct costs. The cost analysis in AD rulemaking actions, 
however, typically does not include incidental or operational costs 
such as the time required for planning or other administrative actions, 
and, in this case, possible additional fuel costs. Those costs, which 
might vary significantly among operators, are almost impossible to 
calculate. Additionally, we have determined that the additional fuel 
burn necessitated by the AFM procedure would be insignificant. However, 
as we explain under ``Request to Revise the Proposed AFM Text,'' we 
have revised the procedure to allow the ANTI-ICE switches to be placed 
in the OFF position when icing conditions are no longer present or 
anticipated. This allowance will further reduce any additional fuel 
burn caused by the use of the anti-ice system. We have not changed the 
Costs of Compliance section of this AD in this regard.

Request To Include Alternative AFM Requirements

    FedEx recommends that we revise the NPRM to allow alternative AFM 
requirements based on the full authority digital engine control (FADEC) 
electronic control unit (ECU) installed software version. FedEx states 
that GE has documented six flameout events suspected to be a result of 
ice-crystal accretion. FedEx points out that GE Service Bulletin 73-21-
07, Engine fuel and control--Electronic Control Unit Introduction of 
Software Version 8.3.K (8322), was introduced to improve the flameout 
margin in ice-crystal conditions. FedEx explains that this software 
change will create new engine control configurations with enhanced 
variable bypass valve (VBV) scheduling logic for inclement weather, and 
will change the scheduling of the VBVs at high altitude to increase ice 
extraction from the booster-core flowpath transition to the fan exit 
stream. FedEx believes there have been no suspected flameout events on 
airplanes using the combination of engine anti-ice and ECU software 
version 8.3.K on Model MD-11s, and indicates that it is upgrading its 
fleet to ECU software version 8.3.K in accordance with AD 2007-22-07, 
Amendment 39-15243 (72 FR 60227, October 24, 2007), applicable to GE 
CF6-80C2D1F turbofan engines. Therefore, FedEx proposes that airplanes 
with ECU software version 8.3.J or previous should follow the AFM 
requirement proposed in the NPRM, and airplanes with software version 
8.3.K or subsequent should be allowed to follow alternative AFM 
requirements. FedEx provides suggested wording for an alternative AFM 
requirement.
    We do not agree to revise this AD to allow alternative AFM 
requirements based on the installed software version. Based on a recent 
multiple engine flameout incident on a Model 747-400

[[Page 47206]]

airplane equipped with CF6-80C2B1F engines and ECU software equivalent 
to the version 8.3.K, we have determined that ECU software version 
8.3.K alone will not necessarily provide an adequate margin of safety 
against engine flameout in all environments. We note that the nacelle 
anti-ice had been switched on prior to engine flameout. Increasing the 
bleed flow and engine idle speed by placing the ENG, WING, and TAIL 
ANTI-ICE switches in the ON position will provide additional margin for 
engine flameout. We have not revised the AD in this regard.

Request To Remove Part of the AFM Requirement

    FedEx requests that additional justification be made available to 
support the proposed AFM requirement to use wing and tail anti-ice 
systems. FedEx states that both its flight operations and engineering 
staffs agree that increasing the flameout margin to buffer against 
possible core shedding of ice-crystal accretion is an important 
requirement, and fully support activation of the ENG IGN OVRD switch 
and engine anti-ice as effective means of reducing flameouts. However, 
FedEx feels strongly that part of the proposed AFM requirement is of 
limited value and might not be justifiable. FedEx asserts that 
selection of wing anti-ice would result in a small or incremental 
increase in core temperature, while increasing fuel flow and 
unnecessarily exposing the airplane to additional reliability risks. 
FedEx further notes that the NTSB, in its comments to the NPRM, made no 
mention of wing and tail anti-ice systems being part of the successful 
recommendations on Model 400A airplanes.
    We do not agree to remove the requirement to use wing and tail 
anti-ice. As discussed previously, despite having the nacelle anti-ice 
switched on, a Model 747-400 airplane experienced a multiple engine 
flameout. Therefore, the use of nacelle anti-ice alone is not 
sufficient to prevent a multiple engine flameout. Increasing the bleed 
flow and engine idle speed by placing the ENG, WING, and TAIL ANTI-ICE 
switches in the ON position will provide additional margin against 
engine flameout. We have not revised the AD in this regard.

Request To Revise the Proposed AFM Text

    Boeing proposes that we revise the proposed AFM text provided in 
the NPRM as follows:

    Prior to reducing thrust for descent, when icing conditions 
(defined by visible moisture in the air and TAT is 6 Deg C or below) 
are present, the ENG IGN OVRD switch and the ENG, WING, and TAIL 
ANTI-ICE switches must be placed in the ON position. When icing 
conditions are no longer present or anticipated, place the ENG IGN 
OVRD switch and the ENG, WING, and TAIL ANTI-ICE switches in the OFF 
position.

Boeing states that this AFM text provides additional procedural 
information, as noted in the current Interim Operating Procedures for 
icing conditions that exist or are anticipated prior to descent.
    We agree that the AFM text changes suggested by Boeing do provide 
helpful procedural information. We have also determined that there is 
no additional benefit to having the engine, wing, and tail anti-ice 
switched on once icing conditions are no longer present or anticipated. 
Therefore, we have revised the AFM text provided in paragraph (g) of 
this AD (specified in paragraph (f) of the NPRM) to include the 
supplemental procedural information provided by Boeing, and to allow 
engine, wing, and tail anti-ice to be switched off once icing 
conditions are no longer present or anticipated.

Explanation of Additional Paragraph in This AD

    We have added a new paragraph (d) to this AD to provide the Air 
Transport Association (ATA) of America subject code 30: Ice and rain 
protection. This code is added to make this AD parallel with other new 
AD actions. We have reidentified subsequent paragraphs accordingly.

Explanation of Additional Change Made to the AD

    We have revised this AD to identify the legal name of the 
manufacturer as published in the most recent type certificate data 
sheet for the affected airplane models.

Conclusion

    We reviewed the relevant data, considered the comments received, 
and determined that air safety and the public interest require adopting 
the AD with the changes described previously. We also determined that 
these changes will not increase the economic burden on any operator or 
increase the scope of the AD.

Interim Action

    We consider this AD interim action. If final action is later 
identified, we might consider further rulemaking then.

Explanation of Change to Costs of Compliance

    Since issuance of the original NPRM, we have increased the labor 
rate used in the Costs of Compliance from $80 per work-hour to $85 per 
work-hour. The Costs of Compliance information, below, reflects this 
increase in the specified hourly labor rate.

Costs of Compliance

    There are about 118 airplanes of the affected design in the 
worldwide fleet. The following table provides the estimated costs for 
U.S. operators to comply with this AD.

                                                                     Estimated Costs
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                                                        Number of U.S.-
                      Action                           Work hours     Average labor        Parts           Cost per        registered       Fleet cost
                                                                      rate per hour                        airplane        airplanes
--------------------------------------------------------------------------------------------------------------------------------------------------------
AFM revision......................................               1              $85               $0              $85               70           $5,950
--------------------------------------------------------------------------------------------------------------------------------------------------------

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, section 106, describes the 
authority of the FAA Administrator. ``Subtitle VII: Aviation 
Programs,'' describes in more detail the scope of the Agency's 
authority.
    We are issuing this rulemaking under the authority described in 
``Subtitle VII, Part A, Subpart III, Section 44701: General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on

[[Page 47207]]

products identified in this rulemaking action.

Regulatory Findings

    This AD will not have federalism implications under Executive Order 
13132. This AD will not have a substantial direct effect on the States, 
on the relationship between the national government and the States, or 
on the distribution of power and responsibilities among the various 
levels of government.
    For the reasons discussed above, I certify that this AD:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Is not a ``significant rule'' under DOT Regulatory Policies and 
Procedures (44 FR 11034, February 26, 1979), and
    (3) Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.
    You can find our regulatory evaluation and the estimated costs of 
compliance in the AD Docket.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

Adoption of the Amendment

0
Accordingly, under the authority delegated to me by the Administrator, 
the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
1. The authority citation for part 39 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Amended]

0
2. The FAA amends Sec.  39.13 by adding the following new AD:

2010-16-03 McDonnell Douglas Corporation: Amendment 39-16379. Docket 
No. FAA-2008-0403; Directorate Identifier 2007-NM-166-AD.

Effective Date

    (a) This airworthiness directive (AD) is effective September 9, 
2010.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to McDonnell Douglas Corporation Model MD-11 
and MD-11F airplanes, certified in any category, equipped with 
General Electric CF6-80C2 series engines.

Subject

    (d) Air Transport Association (ATA) of America Code 30: Ice and 
rain protection.

Unsafe Condition

    (e) This AD results from reports of several in-flight engine 
flameouts, including multiple dual engine flameout events, in ice-
crystal icing conditions. We are issuing this AD to ensure that the 
flightcrew has the proper procedures to follow in certain icing 
conditions. These certain icing conditions could cause a multiple 
engine flameout during flight with the potential inability to 
restart the engines, and consequent forced landing of the airplane.

Compliance

    (f) You are responsible for having the actions required by this 
AD performed within the compliance times specified, unless the 
actions have already been done.

Airplane Flight Manual (AFM) Revision

    (g) Within 14 days after the effective date of this AD, revise 
the Limitations Section of the McDonnell Douglas MD-11/MD-11F AFM to 
include the following statement. This may be done by inserting a 
copy of this AD into the AFM.

    ``Prior to reducing thrust for descent when icing conditions 
(defined by visible moisture in the air and TAT is 6 [deg]C or 
below) are present, the ENG IGN OVRD switch and the ENG, WING, and 
TAIL ANTI-ICE switches must be placed in the ON position. When icing 
conditions are no longer present or anticipated, place the ENG IGN 
OVRD switch and the ENG, WING, and TAIL ANTI-ICE switches in the OFF 
position.''

    Note 1: When a statement identical to that in paragraph (g) of 
this AD has been included in the general revisions of the AFM, the 
general revisions may be inserted into the AFM, and the copy of this 
AD may be removed from the AFM.

Alternative Methods of Compliance (AMOCs)

    (h)(1) The Manager, Los Angeles Aircraft Certification Office 
(ACO), FAA, has the authority to approve AMOCs for this AD, if 
requested using the procedures found in 14 CFR 39.19. Send 
information to ATTN: Samuel Lee, Aerospace Engineer, Propulsion 
Branch, ANM-140L, FAA, Los Angeles Aircraft Certification Office, 
3960 Paramount Boulevard, Lakewood, California 90712-4137; telephone 
(562) 627-5262; fax (562) 627-5210.
    (2) To request a different method of compliance or a different 
compliance time for this AD, follow the procedures in 14 CFR 39.19. 
Before using any approved AMOC on any airplane to which the AMOC 
applies, notify your principal maintenance inspector (PMI) or 
principal avionics inspector (PAI), as appropriate, or lacking a 
principal inspector, your local Flight Standards District Office. 
The AMOC approval letter must specifically reference this AD.

Material Incorporated by Reference

    (i) None.

    Issued in Renton, Washington on July 16, 2010.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2010-19156 Filed 8-4-10; 8:45 am]
BILLING CODE 4910-13-P
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