Airworthiness Directives; The Boeing Company Airplanes, 14722-14726 [2013-05202]

Download as PDF 14722 Federal Register / Vol. 78, No. 45 / Thursday, March 7, 2013 / Proposed Rules (e) Unsafe Condition This AD was prompted by an evaluation by the design approval holder (DAH) indicating that the fuselage skin just above certain lap splice locations is subject to widespread fatigue damage (WFD). We are issuing this AD to detect and correct fatigue cracking of the fuselage skin, which could result in reduced structural integrity of the airplane and sudden loss of cabin pressure. (f) Compliance Comply with this AD within the compliance times specified, unless already done. emcdonald on DSK67QTVN1PROD with PROPOSALS (g) Repetitive Inspection Perform external sliding probe eddy current inspections of the fuselage skin for cracking, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 747–53A2854, dated September 17, 2012, except where this service bulletin specifies to contact Boeing for inspection instructions, this AD requires doing the inspection using a method approved in accordance with the procedures specified in paragraph (h) of this AD. Do the inspection at the applicable initial compliance time specified in paragraph 1.E., ‘‘Compliance,’’ of Boeing Alert Service Bulletin 747–53A2854, dated September 17, 2012, except where this service bulletin specifies a compliance time after the ‘‘original issue date of this service bulletin,’’ this AD requires compliance within the specified compliance time after the effective date of this AD. (1) If no cracking is found during any inspection required by paragraph (g) of this AD, repeat the inspection thereafter at the applicable compliance time intervals specified in paragraph 1.E., ‘‘Compliance,’’ of Boeing Alert Service Bulletin 747–53A2854, dated September 17, 2012. (2) If any cracking is found during any inspection required by paragraph (g) of this AD: Before further flight, repair the cracking using a method approved in accordance with the procedures specified in paragraph (h) of this AD. (h) Alternative Methods of Compliance (AMOCs) (1) The Manager, Seattle 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. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the ACO, send it to the attention of the person identified in the Related Information section of this AD. Information may be emailed to: 9-ANMSeattle-ACO-AMOC-Requests@faa.gov. (2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/ certificate holding district office. (3) An AMOC that provides an acceptable level of safety may be used for any repair required by this AD if it is approved by the Boeing Commercial Airplanes Organization VerDate Mar<15>2010 14:41 Mar 06, 2013 Jkt 229001 Designation Authorization (ODA) that has been authorized by the Manager, Seattle ACO, to make those findings. For a repair method to be approved, the repair must meet the certification basis of the airplane, and the approval must specifically refer to this AD. (i) Related Information (1) For more information about this AD, contact Nathan Weigand, Aerospace Engineer, Airframe Branch, ANM–120S, FAA, Seattle Aircraft Certification Office (ACO), 1601 Lind Avenue SW., Renton, WA 98057–3356; phone: 425–917–6428; fax: 425– 917–6590; email: Nathan.P.Weigand@faa.gov. (2) For service information identified in this AD, contact Boeing Commercial Airplanes, Attention: Data & Services Management, P.O. Box 3707, MC 2H–65, Seattle, WA 98124–2207; telephone 206– 544–5000, extension 1; fax 206–766–5680; Internet https://www.myboeingfleet.com. You may review copies of the service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, WA. For information on the availability of this material at the FAA, call 425–227–1221. Issued in Renton, Washington, on February 20, 2013. Jeffrey E. Duven, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 2013–05191 Filed 3–6–13; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2008–0618; Directorate Identifier 2007–NM–355–AD] RIN 2120–AA64 Airworthiness Directives; The Boeing Company Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period. AGENCY: SUMMARY: We are revising an earlier proposed airworthiness directive (AD) for all The Boeing Company Model 777 airplanes. That NPRM proposed to require performing repetitive operational tests of the engine fuel suction feed of the fuel system, and other related testing if necessary. That NPRM was prompted by reports of two in-service occurrences on Model 737– 400 airplanes of total loss of boost pump pressure of the fuel feed system, followed by loss of fuel system suction feed capability on one engine, and inflight shutdown of the engine. This action revises that NPRM by proposing PO 00000 Frm 00006 Fmt 4702 Sfmt 4702 to revise the maintenance program to incorporate a revision to the Airworthiness Limitations Section of the maintenance planning data (MPD) document. We are proposing this supplemental NPRM to detect and correct failure of the engine fuel suction feed of the fuel system, which, in the event of total loss of the fuel boost pumps, could result in dual engine flameout, inability to restart the engines, and consequent forced landing of the airplane. Since these actions impose an additional burden over that proposed in the previous NPRM, we are reopening the comment period to allow the public the chance to comment on these proposed changes. DATES: We must receive comments on this supplemental NPRM by April 22, 2013. You may send comments, using the procedures found in 14 CFR 11.43 and 11.45, by any of the following methods: • Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the instructions for submitting comments. • Fax: 202–493–2251. • Mail: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue SE., Washington, DC 20590. • Hand Delivery: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue SE., Washington, DC 20590, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. For service information identified in this proposed AD, contact Boeing Commercial Airplanes, Attention: Data & Services Management, P.O. Box 3707, MC 2H–65, Seattle, WA 98124–2207; telephone 206–544–5000, extension 1; fax 206–766–5680; Internet https:// www.myboeingfleet.com. You may review copies of the referenced service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington. For information on the availability of this material at the FAA, call 425–227–1221. ADDRESSES: 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 proposed AD, the regulatory evaluation, any comments received, and other information. The street address for the Docket Office (phone: 800–647–5527) is in the E:\FR\FM\07MRP1.SGM 07MRP1 Federal Register / Vol. 78, No. 45 / Thursday, March 7, 2013 / Proposed Rules section. Comments will be available in the AD docket shortly after receipt. FOR FURTHER INFORMATION CONTACT: Sue Lucier, Aerospace Engineer, Propulsion Branch, ANM–140S, 1601 Lind Avenue SW., Renton, Washington 98057–3356; phone: 425–917–6438; fax: 425–917– 6590; email: suzanne.lucier@faa.gov. SUPPLEMENTARY INFORMATION: ADDRESSES Comments Invited We invite you to send any written relevant data, views, or arguments about this proposed AD. Send your comments to an address listed under the ADDRESSES section. Include ‘‘Docket No. FAA–2008–0618; Directorate Identifier 2007–NM–355–AD’’ at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this proposed AD. We will consider all comments received by the closing date and may amend this proposed AD because of those comments. We will post all comments we receive, without change, to https:// www.regulations.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact we receive about this proposed AD. emcdonald on DSK67QTVN1PROD with PROPOSALS Discussion We issued an NPRM to amend 14 CFR part 39 to include an AD that would apply to all The Boeing Company Model 777 airplanes. That NPRM published in the Federal Register on June 6, 2008 (73 FR 32253). That NPRM proposed to require repetitive operational tests of the engine fuel suction feed of the fuel system, and other related testing if necessary. That NPRM was prompted by reports of two in-service occurrences on The Boeing Company Model 737–400 airplanes of total loss of boost pump pressure of the fuel feed system, followed by loss of fuel system suction feed capability on one engine, and inflight shutdown of the engine. The subject area on Model 777 airplanes is almost identical to that on the affected Model 737–400 airplanes. Therefore, those Model 777 airplanes may be subject to the unsafe condition revealed on the Model 737–400 airplanes. Actions Since Previous NPRM (73 FR 32253, June 6, 2008) Was Issued Since we issued the previous NPRM (73 FR 32253, June 6, 2008), we have received comments from operators indicating a high level of difficulty performing the actions in the previous NPRM during maintenance operations. VerDate Mar<15>2010 14:41 Mar 06, 2013 Jkt 229001 Relevant Service Information We reviewed Section 9, ‘‘Airworthiness Limitations (AWLs) and Certification Maintenance Requirements (CMRs),’’ D622W001–9, Revision February 2012, of the Boeing 777 Maintenance Planning Data (MPD) Document. Among other things, Section 9 describes AWL No. 28–AWL–101, ‘‘Engine Fuel Suction Feed Operational Test, of Section D.2., Engine Fuel Suction Feed System,’’ which provides procedures for performing repetitive operational tests of the engine fuel suction feed of the fuel system. Comments We gave the public the opportunity to comment on the previous NPRM (73 FR 32253, June 6, 2008). The following presents the comments received on the previous NPRM and the FAA’s response to each comment. Requests To Clarify if Engine Fuel Suction Feed Test Is Allowed in Lieu of the Operational Test Airlines for America (A4A) on behalf of its member American Airlines (AAL), Japan Airlines (JAL), Air New Zealand (ANZ), British Airways (BA), and Boeing asked that we clarify the engine fuel suction feed test procedure in the airplane maintenance manual (AMM) as an option to performing the operational test in the previous NPRM (73 FR 32253, June 6, 2008). AAL and BA asked that we consider adding the engine fuel suction feed manifold leak-test procedure specified in the AMM task card as an option to performing the operational test. AAL, JAL, and ANZ stated that Boeing 777 Task Card 28– 020–02–01 specifies two approved procedures to perform the operational test, but operators need only one of those to perform the test. JAL also stated that it has been doing the operational test as specified in MPD Item 28–020– 00 or 28–02–01, as applicable; these MPD items identify AMM Task 28–22– 00–710–802, ‘‘Engine Fuel Suction Feed—Operational Test,’’ and AMM Task 28–22–15–790–808, ‘‘Engine Fuel Feed and Refuel Manifold Leak Isolation,’’ at 7,500 flight-hour intervals. JAL stated that the two tasks are equivalent tests and each would satisfy the operations test requirement of the previous NPRM. We agree to provide clarification. The manifold test (Task 28–22–00–710–801) is not equivalent to the operational test (Task 28–22–00–710–802) for the purposes of this proposed action. The positive internal fuel line pressure applied during the manifold test does not simulate the same conditions PO 00000 Frm 00007 Fmt 4702 Sfmt 4702 14723 encountered during fuel suction feed (i.e., vacuum), and might mask a failure. Therefore, we have not changed the supplemental NPRM in this regard. Request to Extend Compliance Time United Airlines (UAL) asked that we extend the compliance time in the previous NPRM (73 FR 32253, June 6, 2008) from 7,500 flight hours to 7,500 flight hours or 25 months. UAL stated that this extension would provide operators the opportunity to do the test during maintenance checks. We agree with the commenter for the reason provided; however, Boeing has recommended a standardized calendar time for that compliance time extension of ‘‘Within 7,500 flight hours or 3 years, whichever is first.’’ Therefore, we have changed this supplemental NPRM to revise the maintenance program to incorporate the AWL identified in Appendix 1 of this AD, which includes an interval of ‘‘7,500 flight hours or 3 years, whichever is first.’’ With the exception of including a calendar time in the task interval, Appendix 1 of this AD is equivalent to AWL No. 28–AWL– 101, ‘‘Engine Fuel Suction Feed Operational Test,’’ of Section D.2., ‘‘AWLS—Fuel Systems,’’ of Section 9, ‘‘Airworthiness Limitations (AWLs) and Certification Maintenance Requirements (CMRs),’’ D622W001–9, Revision February 2012, of the Boeing 777 Maintenance Planning Data (MPD) Document. Request To Include Corrective Action Boeing asked that additional testing, better described as corrective action, be included in the proposed requirements of the previous NPRM (73 FR 32253, June 6, 2008). Boeing recommended that paragraph (f) of the previous NPRM be changed to add corrective actions in case the engine suction feed operational test is not successful. We disagree with the request to include corrective action for this supplemental NPRM, since the AWL already includes that requirement. Therefore, we have not changed the supplemental NPRM in this regard. Request To Clarify Reason for the Unsafe Condition Boeing asked that we clarify the reason for the unsafe condition identified in the previous NPRM (73 FR 32253, June 6, 2008). Boeing asked that the AD include the results from a report of in-service occurrences of loss of fuel system suction feed capability on one engine, due to two in-service engine flameout events on a Model 737–400 airplane while operating on suction feed with undetected air leak failures. Boeing E:\FR\FM\07MRP1.SGM 07MRP1 14724 Federal Register / Vol. 78, No. 45 / Thursday, March 7, 2013 / Proposed Rules stated that there are no known reports of any engine flameout related to events on Model 777 airplanes. Boeing acknowledged that undetected air leaks could exist and that this maintenance procedure is a proactive measure to ensure engine flameout will not occur during suction feed operation. We agree to clarify the unsafe condition. We have revised the Summary section and paragraph (e) of this supplemental NPRM accordingly. Requests for Changes to Certain Maintenance Document References Boeing asked that we remove the AMM reference to Section 28–22–00 specified in paragraph (f) of the previous NPRM (73 FR 32253, June 6, 2008). Boeing stated that the AMM is covered in Boeing 777 Task Card 28– 020–02–01, and noted that having fewer references included lessens the chance of errors. UAL asked that we specify using the task card or the AMM, but not require using both. UAL also noted that the AMM reference to the General Description section of the AMM is incorrect. UAL stated that the correct reference is in Section 28–22–00, titled ‘‘Engine Fuel Feed System— Adjustment/Test.’’ ANZ added that, since the task cards are extracts from the AMM, the previous NPRM should state that two methods are approved. BA stated that the task card is already covered by the AMM, and noted that the task card identified in paragraph (g) of the previous NPRM applies only to Trent powered airplanes. Boeing also asked that we consider adding engine specific task cards for operational tests of the engine fuel suction feed. We acknowledge and agree with the commenters concerns regarding the maintenance documents referenced in the previous NPRM (73 FR 32253, June 6, 2008). However, these maintenance documents are not FAA approved and we do not have the publication controls associated with AD-related service documents. We do not agree with incorporating the requested changes because we have mandated an FAAapproved document instead, which should eliminate these issues. We have the unsafe condition described previously is likely to exist or develop in other products of the same type design. Certain changes described above expand the scope of the original NPRM (73 FR 32253, June 6, 2008). As a result, we have determined that it is necessary to reopen the comment period to provide additional opportunity for the public to comment on this supplemental NPRM. made no change to the supplemental NPRM in this regard. Requests To Allow the Use of Later Revisions of the Maintenance Documents ANZ, BA, and Boeing asked that we allow using later revisions of the referenced maintenance documents, because those documents could be revised over time and would require frequent requests for alternative methods of compliance (AMOCs). We do not agree with the request. Allowing later revisions of service documents in an AD is not allowed by the Office of the Federal Register regulations for approving materials incorporated by reference. We have made no change to the supplemental NPRM in this regard. Proposed Requirements of the Supplemental NPRM Request To Revise Costs of Compliance Section AAL asked that the cost estimate be changed. AAL stated that the cost estimate specified in the previous NPRM (73 FR 32253, June 6, 2008) should not reflect labor only, because approximately 10 minutes of engine run-time will consume roughly 600 pounds of fuel per operational test. AAL noted that for its current fleet of 47 Model 777 airplanes, this equates to an additional 28,200 pounds of fuel expended every 7,500 flight hours to accomplish the proposed test. We acknowledge the commenter’s request. Although fuel is used during the operational test, we have not received data on the amount of fuel used during a test. In addition, fuel costs vary among operators. Therefore, we do not have definitive data that would enable us to provide a cost estimate for the fuel used. In any case, we have determined that direct and incidental costs are still outweighed by the safety benefits of the AD. We have made no change to the supplemental NPRM in this regard. FAA’s Determination We are proposing this supplemental NPRM because we evaluated all the relevant information and determined This supplemental NPRM revises the previous NPRM (73 FR 32253, June 6, 2008), by proposing to revise the maintenance program to incorporate a revision to the Airworthiness Limitations Section of the MPD document. This supplemental NPRM proposes to require a revision to certain operator maintenance documents to include new operational tests. Compliance with these tests is required by 14 CFR 91.403(c). For airplanes that have been previously modified, altered, or repaired in the areas addressed by these tests, the operator might not be able to accomplish the tests described in the revisions. In this situation, to comply with 14 CFR 91.403(c), the operator must request approval for an AMOC according to the procedures specified in paragraph (j) of this AD. The request should include a description of changes to the required tests that will ensure the continued operational safety of the airplane. Explanation of Change to Costs of Compliance Since issuance of the previous NPRM (73 FR 32253, June 6, 2008), we have increased the labor rate used in the Costs of Compliance from $80 per workhour to $85 per work-hour. The Costs of Compliance information, below, reflects this increase in the specified labor rate. Costs of Compliance We estimate that this proposed AD would affect 676 airplanes of U.S. registry. We estimate the following costs to comply with this proposed AD: emcdonald on DSK67QTVN1PROD with PROPOSALS ESTIMATED COSTS Action Maintenance Program Revision. VerDate Mar<15>2010 14:41 Mar 06, 2013 Labor cost Cost per product 1 work-hour × $85 per hour = $85 ....................................... $85 per test ........................... Jkt 229001 PO 00000 Frm 00008 Fmt 4702 Sfmt 4702 E:\FR\FM\07MRP1.SGM 07MRP1 Cost on U.S. operators $57,460, per test. Federal Register / Vol. 78, No. 45 / Thursday, March 7, 2013 / Proposed Rules We have received no definitive data that would enable us to provide a cost estimate for the on-condition actions or the optional terminating action specified in this AD. the FAA proposes to amend 14 CFR part 39 as follows: 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 products identified in this rulemaking action. ■ emcdonald on DSK67QTVN1PROD with PROPOSALS Regulatory Findings We determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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 this proposed regulation: (1) Is not a ‘‘significant regulatory action’’ under Executive Order 12866, (2) Is not a ‘‘significant rule’’ under the DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979), (3) Will not affect intrastate aviation in Alaska, and (4) 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. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, VerDate Mar<15>2010 14:41 Mar 06, 2013 Jkt 229001 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 airworthiness directive (AD): ■ The Boeing Company: Docket No. FAA– 2008–0618; Directorate Identifier 2007– NM–355–AD. (a) Comments Due Date We must receive comments by April 22, 2013. (b) Affected ADs None. (c) Applicability This AD applies to all The Boeing Company Model 777–200, –200LR, –300, and –300ER series airplanes, certificated in any category. (d) Subject Joint Aircraft System Component (JASC)/ Air Transport Association (ATA) of America Code 2800, Aircraft Fuel System. (e) Unsafe Condition This AD was prompted by reports of two in-service occurrences on Model 737–400 airplanes of total loss of boost pump pressure of the fuel feed system, followed by loss of fuel system suction feed capability on one engine, and in-flight shutdown of the engine. We are issuing this AD to detect and correct failure of the engine fuel suction feed of the fuel system, which, in the event of total loss of the fuel boost pumps, could result in dual engine flameout, inability to restart the engines, and consequent forced landing of the airplane. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Maintenance Program Revision Within 90 days after the effective date of this AD: Revise the maintenance program to incorporate the Airworthiness Limitation (AWL) identified in Appendix 1 of this AD. The initial compliance time for accomplishing AWL No. AWL–28–101 is within 7,500 flight hours or 3 years after the effective date of this AD, whichever is first. (h) No Alternative Actions, Intervals, and/or Critical Design Configuration Control Limitations (CDCCLs) After accomplishing the revision required by paragraph (g) of this AD, no alternative PO 00000 Frm 00009 Fmt 4702 Sfmt 4702 14725 actions (e.g., tests), intervals, or CDCCLs may be used unless the actions, intervals, or CDCCLs are approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (j) of this AD. (i) Credit for Incorporating Previous Maintenance Program Revision This paragraph provides credit for the actions required by paragraph (g) of this AD, if those actions were performed before the effective date of this AD using AWL No. 28– AWL–101, Engine Fuel Suction Feed Operational Test, of Section D.2., AWLS— Fuel Systems of Section 9, Airworthiness Limitations (AWLs) and Certification Maintenance Requirements (CMRs), D622W001–9, Revision February 2012, of the Boeing 777 Maintenance Planning Data (MPD) Document, provided the revised ‘‘interval’’ specified in Appendix 1 of this AD is incorporated into the existing maintenance program within 90 days after the effective date of this AD. (j) Alternative Methods of Compliance (AMOCs) (1) The Manager, Seattle 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. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the ACO, send it to the attention of the person identified in the Related Information section of this AD. Information may be emailed to: 9-ANMSeattle-ACO-AMOC-Requests@faa.gov. (2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/ certificate holding district office. (k) Related Information (1) For more information about this AD, contact Sue Lucier, Aerospace Engineer, Propulsion Branch, ANM–140S, 1601 Lind Avenue SW., Renton, Washington 98057– 3356; phone: 425–917–6438; fax: 425–917– 6590; email: suzanne.lucier@faa.gov. (2) For service information identified in this AD, contact Boeing Commercial Airplanes, Attention: Data & Services Management, P.O. Box 3707, MC 2H–65, Seattle, WA 98124–2207; telephone 206– 544–5000, extension 1; fax 206–766–5680; Internet https://www.myboeingfleet.com. You may review copies of the referenced service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington. For information on the availability of this material at the FAA, call 425–227–1221. E:\FR\FM\07MRP1.SGM 07MRP1 14726 Federal Register / Vol. 78, No. 45 / Thursday, March 7, 2013 / Proposed Rules APPENDIX 1 AWL No. Task 28–AWL–101 .................... ALI Interval Applicability 7,500 FH or 3 years, whichever is first. Description ALL .................................. Engine Fuel Suction Feed Operational Test. An Engine Fuel Suction Feed Operational Test must be accomplished successfully on each engine individually. This test is required in order to protect against engine flameout during suction feed operations, and must meet the following requirements (refer to Boeing AMM 28–22–00): Fuel Tank Quantity Limitations: Engine No. 1 a. The Center Tank Fuel Quantity must not exceed 5,000 lbs (2,270 kg). b. The Main Tank No. 1 Fuel Quantity must be between 1,400 lbs–1,600 lbs (600 kg–800 kg). NOTE: Excess fuel can be transferred to Main Tank No. 2. Engine No. 2 a. The Center Tank Fuel Quantity must not exceed 5,000 lbs (2,270 kg). b. The Main Tank No. 2 Fuel Quantity must be between 1,400 lbs–1,600 lbs (600 kg–800 kg). NOTE: Excess fuel can be transferred to Main Tank No. 1. Test Procedural Limitations: 1. The Fuel Cross-Feed Valve must be CLOSED. 2. The APU Selector Switch must be OFF. 3. Idle Engine Warm-up time of minimum two minutes with Boost Pump ON. 4. Idle Engine Suction Feed (Boost Pump OFF) operation for a minimum of five minutes. NOTE: APU may be used to start the engines provided the Fuel Tank Quantity and Test Procedural Limitations are met. The test is considered a success if engine operation is maintained during the five-minute period and engine parameters (N1, N2, and Fuel Flow) do not decay relative to those observed with Boost Pump ON. A suction fee system that fails the operational test must be repaired or maintained, and successfully pass the Engine Suction Feed Operational Test prior to further flight. Directorate Identifier 2007–NM–355–AD DEPARTMENT OF TRANSPORTATION Issued in Renton, Washington, on February 15, 2013. Kalene C. Yanamura, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. Federal Aviation Administration [FR Doc. 2013–05202 Filed 3–6–13; 8:45 am] BILLING CODE 4910–13–P 14 CFR Part 39 [Docket No. FAA–2012–1052; Directorate Identifier 2012–CE–014–AD] RIN 2120–AA64 emcdonald on DSK67QTVN1PROD with PROPOSALS Airworthiness Directives; Cessna Aircraft Company Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period. AGENCY: SUMMARY: We are revising an earlier proposed airworthiness directive (AD) for certain Cessna Aircraft Company VerDate Mar<15>2010 14:41 Mar 06, 2013 Jkt 229001 PO 00000 Frm 00010 Fmt 4702 Sfmt 4702 (Cessna) Models 172R, 172S, 182S, 182T, T182T, 206H, and T206H airplanes. That NPRM proposed to supersede an existing AD that currently requires an inspection of the engine oil pressure switch and, if applicable, replacement with an improved engine oil pressure switch. Since we issued the existing AD, we have received new reports of internal failure of the improved engine oil pressure switch, which could result in complete loss of engine oil with consequent partial or complete loss of engine power or fire. The NPRM proposed to increase the applicability of the AD and place a lifelimit of 3,000 hours time-in-service (TIS) on the engine oil pressure switch, requiring replacement when the engine oil pressure switch reaches its life limit. E:\FR\FM\07MRP1.SGM 07MRP1

Agencies

[Federal Register Volume 78, Number 45 (Thursday, March 7, 2013)]
[Proposed Rules]
[Pages 14722-14726]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2013-05202]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2008-0618; Directorate Identifier 2007-NM-355-AD]
RIN 2120-AA64

Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Supplemental notice of proposed rulemaking (NPRM); reopening of
comment period.

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

SUMMARY: We are revising an earlier proposed airworthiness directive
(AD) for all The Boeing Company Model 777 airplanes. That NPRM proposed
to require performing repetitive operational tests of the engine fuel
suction feed of the fuel system, and other related testing if
necessary. That NPRM was prompted by reports of two in-service
occurrences on Model 737-400 airplanes of total loss of boost pump
pressure of the fuel feed system, followed by loss of fuel system
suction feed capability on one engine, and in-flight shutdown of the
engine. This action revises that NPRM by proposing to revise the
maintenance program to incorporate a revision to the Airworthiness
Limitations Section of the maintenance planning data (MPD) document. We
are proposing this supplemental NPRM to detect and correct failure of
the engine fuel suction feed of the fuel system, which, in the event of
total loss of the fuel boost pumps, could result in dual engine
flameout, inability to restart the engines, and consequent forced
landing of the airplane. Since these actions impose an additional
burden over that proposed in the previous NPRM, we are reopening the
comment period to allow the public the chance to comment on these
proposed changes.

DATES: We must receive comments on this supplemental NPRM by April 22,
2013.

ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the instructions for submitting comments.
Fax: 202-493-2251.
Mail: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE., Washington, DC 20590.
Hand Delivery: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE., Washington, DC 20590, between 9 a.m. and 5 p.m.,
Monday through Friday, except Federal holidays.
For service information identified in this proposed AD, contact
Boeing Commercial Airplanes, Attention: Data & Services Management,
P.O. Box 3707, MC 2H-65, Seattle, WA 98124-2207; telephone 206-544-
5000, extension 1; fax 206-766-5680; Internet https://www.myboeingfleet.com. You may review copies of the referenced service
information at the FAA, Transport Airplane Directorate, 1601 Lind
Avenue SW., Renton, Washington. For information on the availability of
this material at the FAA, call 425-227-1221.

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 proposed AD, the regulatory
evaluation, any comments received, and other information. The street
address for the Docket Office (phone: 800-647-5527) is in the

[[Page 14723]]

ADDRESSES section. Comments will be available in the AD docket shortly
after receipt.

FOR FURTHER INFORMATION CONTACT: Sue Lucier, Aerospace Engineer,
Propulsion Branch, ANM-140S, 1601 Lind Avenue SW., Renton, Washington
98057-3356; phone: 425-917-6438; fax: 425-917-6590; email:
suzanne.lucier@faa.gov.

SUPPLEMENTARY INFORMATION:

Comments Invited

We invite you to send any written relevant data, views, or
arguments about this proposed AD. Send your comments to an address
listed under the ADDRESSES section. Include ``Docket No. FAA-2008-0618;
Directorate Identifier 2007-NM-355-AD'' at the beginning of your
comments. We specifically invite comments on the overall regulatory,
economic, environmental, and energy aspects of this proposed AD. We
will consider all comments received by the closing date and may amend
this proposed AD because of those comments.
We will post all comments we receive, without change, to https://www.regulations.gov, including any personal information you provide. We
will also post a report summarizing each substantive verbal contact we
receive about this proposed AD.

Discussion

We issued an NPRM to amend 14 CFR part 39 to include an AD that
would apply to all The Boeing Company Model 777 airplanes. That NPRM
published in the Federal Register on June 6, 2008 (73 FR 32253). That
NPRM proposed to require repetitive operational tests of the engine
fuel suction feed of the fuel system, and other related testing if
necessary. That NPRM was prompted by reports of two in-service
occurrences on The Boeing Company Model 737-400 airplanes of total loss
of boost pump pressure of the fuel feed system, followed by loss of
fuel system suction feed capability on one engine, and in-flight
shutdown of the engine. The subject area on Model 777 airplanes is
almost identical to that on the affected Model 737-400 airplanes.
Therefore, those Model 777 airplanes may be subject to the unsafe
condition revealed on the Model 737-400 airplanes.

Actions Since Previous NPRM (73 FR 32253, June 6, 2008) Was Issued

Since we issued the previous NPRM (73 FR 32253, June 6, 2008), we
have received comments from operators indicating a high level of
difficulty performing the actions in the previous NPRM during
maintenance operations.

Relevant Service Information

We reviewed Section 9, ``Airworthiness Limitations (AWLs) and
Certification Maintenance Requirements (CMRs),'' D622W001-9, Revision
February 2012, of the Boeing 777 Maintenance Planning Data (MPD)
Document. Among other things, Section 9 describes AWL No. 28-AWL-101,
``Engine Fuel Suction Feed Operational Test, of Section D.2., Engine
Fuel Suction Feed System,'' which provides procedures for performing
repetitive operational tests of the engine fuel suction feed of the
fuel system.

Comments

We gave the public the opportunity to comment on the previous NPRM
(73 FR 32253, June 6, 2008). The following presents the comments
received on the previous NPRM and the FAA's response to each comment.

Requests To Clarify if Engine Fuel Suction Feed Test Is Allowed in Lieu
of the Operational Test

Airlines for America (A4A) on behalf of its member American
Airlines (AAL), Japan Airlines (JAL), Air New Zealand (ANZ), British
Airways (BA), and Boeing asked that we clarify the engine fuel suction
feed test procedure in the airplane maintenance manual (AMM) as an
option to performing the operational test in the previous NPRM (73 FR
32253, June 6, 2008). AAL and BA asked that we consider adding the
engine fuel suction feed manifold leak-test procedure specified in the
AMM task card as an option to performing the operational test. AAL,
JAL, and ANZ stated that Boeing 777 Task Card 28-020-02-01 specifies
two approved procedures to perform the operational test, but operators
need only one of those to perform the test. JAL also stated that it has
been doing the operational test as specified in MPD Item 28-020-00 or
28-02-01, as applicable; these MPD items identify AMM Task 28-22-00-
710-802, ``Engine Fuel Suction Feed--Operational Test,'' and AMM Task
28-22-15-790-808, ``Engine Fuel Feed and Refuel Manifold Leak
Isolation,'' at 7,500 flight-hour intervals. JAL stated that the two
tasks are equivalent tests and each would satisfy the operations test
requirement of the previous NPRM.
We agree to provide clarification. The manifold test (Task 28-22-
00-710-801) is not equivalent to the operational test (Task 28-22-00-
710-802) for the purposes of this proposed action. The positive
internal fuel line pressure applied during the manifold test does not
simulate the same conditions encountered during fuel suction feed
(i.e., vacuum), and might mask a failure. Therefore, we have not
changed the supplemental NPRM in this regard.

Request to Extend Compliance Time

United Airlines (UAL) asked that we extend the compliance time in
the previous NPRM (73 FR 32253, June 6, 2008) from 7,500 flight hours
to 7,500 flight hours or 25 months. UAL stated that this extension
would provide operators the opportunity to do the test during
maintenance checks.
We agree with the commenter for the reason provided; however,
Boeing has recommended a standardized calendar time for that compliance
time extension of ``Within 7,500 flight hours or 3 years, whichever is
first.'' Therefore, we have changed this supplemental NPRM to revise
the maintenance program to incorporate the AWL identified in Appendix 1
of this AD, which includes an interval of ``7,500 flight hours or 3
years, whichever is first.'' With the exception of including a calendar
time in the task interval, Appendix 1 of this AD is equivalent to AWL
No. 28-AWL-101, ``Engine Fuel Suction Feed Operational Test,'' of
Section D.2., ``AWLS--Fuel Systems,'' of Section 9, ``Airworthiness
Limitations (AWLs) and Certification Maintenance Requirements (CMRs),''
D622W001-9, Revision February 2012, of the Boeing 777 Maintenance
Planning Data (MPD) Document.

Request To Include Corrective Action

Boeing asked that additional testing, better described as
corrective action, be included in the proposed requirements of the
previous NPRM (73 FR 32253, June 6, 2008). Boeing recommended that
paragraph (f) of the previous NPRM be changed to add corrective actions
in case the engine suction feed operational test is not successful.
We disagree with the request to include corrective action for this
supplemental NPRM, since the AWL already includes that requirement.
Therefore, we have not changed the supplemental NPRM in this regard.

Request To Clarify Reason for the Unsafe Condition

Boeing asked that we clarify the reason for the unsafe condition
identified in the previous NPRM (73 FR 32253, June 6, 2008). Boeing
asked that the AD include the results from a report of in-service
occurrences of loss of fuel system suction feed capability on one
engine, due to two in-service engine flameout events on a Model 737-400
airplane while operating on suction feed with undetected air leak
failures. Boeing

[[Page 14724]]

stated that there are no known reports of any engine flameout related
to events on Model 777 airplanes. Boeing acknowledged that undetected
air leaks could exist and that this maintenance procedure is a
proactive measure to ensure engine flameout will not occur during
suction feed operation.
We agree to clarify the unsafe condition. We have revised the
Summary section and paragraph (e) of this supplemental NPRM
accordingly.

Requests for Changes to Certain Maintenance Document References

Boeing asked that we remove the AMM reference to Section 28-22-00
specified in paragraph (f) of the previous NPRM (73 FR 32253, June 6,
2008). Boeing stated that the AMM is covered in Boeing 777 Task Card
28-020-02-01, and noted that having fewer references included lessens
the chance of errors. UAL asked that we specify using the task card or
the AMM, but not require using both. UAL also noted that the AMM
reference to the General Description section of the AMM is incorrect.
UAL stated that the correct reference is in Section 28-22-00, titled
``Engine Fuel Feed System--Adjustment/Test.'' ANZ added that, since the
task cards are extracts from the AMM, the previous NPRM should state
that two methods are approved. BA stated that the task card is already
covered by the AMM, and noted that the task card identified in
paragraph (g) of the previous NPRM applies only to Trent powered
airplanes. Boeing also asked that we consider adding engine specific
task cards for operational tests of the engine fuel suction feed.
We acknowledge and agree with the commenters concerns regarding the
maintenance documents referenced in the previous NPRM (73 FR 32253,
June 6, 2008). However, these maintenance documents are not FAA
approved and we do not have the publication controls associated with
AD-related service documents. We do not agree with incorporating the
requested changes because we have mandated an FAA-approved document
instead, which should eliminate these issues. We have made no change to
the supplemental NPRM in this regard.

Requests To Allow the Use of Later Revisions of the Maintenance
Documents

ANZ, BA, and Boeing asked that we allow using later revisions of
the referenced maintenance documents, because those documents could be
revised over time and would require frequent requests for alternative
methods of compliance (AMOCs).
We do not agree with the request. Allowing later revisions of
service documents in an AD is not allowed by the Office of the Federal
Register regulations for approving materials incorporated by reference.
We have made no change to the supplemental NPRM in this regard.

Request To Revise Costs of Compliance Section

AAL asked that the cost estimate be changed. AAL stated that the
cost estimate specified in the previous NPRM (73 FR 32253, June 6,
2008) should not reflect labor only, because approximately 10 minutes
of engine run-time will consume roughly 600 pounds of fuel per
operational test. AAL noted that for its current fleet of 47 Model 777
airplanes, this equates to an additional 28,200 pounds of fuel expended
every 7,500 flight hours to accomplish the proposed test.
We acknowledge the commenter's request. Although fuel is used
during the operational test, we have not received data on the amount of
fuel used during a test. In addition, fuel costs vary among operators.
Therefore, we do not have definitive data that would enable us to
provide a cost estimate for the fuel used. In any case, we have
determined that direct and incidental costs are still outweighed by the
safety benefits of the AD. We have made no change to the supplemental
NPRM in this regard.

FAA's Determination

We are proposing this supplemental NPRM because we evaluated all
the relevant information and determined the unsafe condition described
previously is likely to exist or develop in other products of the same
type design. Certain changes described above expand the scope of the
original NPRM (73 FR 32253, June 6, 2008). As a result, we have
determined that it is necessary to reopen the comment period to provide
additional opportunity for the public to comment on this supplemental
NPRM.

Proposed Requirements of the Supplemental NPRM

This supplemental NPRM revises the previous NPRM (73 FR 32253, June
6, 2008), by proposing to revise the maintenance program to incorporate
a revision to the Airworthiness Limitations Section of the MPD
document.
This supplemental NPRM proposes to require a revision to certain
operator maintenance documents to include new operational tests.
Compliance with these tests is required by 14 CFR 91.403(c). For
airplanes that have been previously modified, altered, or repaired in
the areas addressed by these tests, the operator might not be able to
accomplish the tests described in the revisions. In this situation, to
comply with 14 CFR 91.403(c), the operator must request approval for an
AMOC according to the procedures specified in paragraph (j) of this AD.
The request should include a description of changes to the required
tests that will ensure the continued operational safety of the
airplane.

Explanation of Change to Costs of Compliance

Since issuance of the previous NPRM (73 FR 32253, June 6, 2008), 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 labor rate.

Costs of Compliance

We estimate that this proposed AD would affect 676 airplanes of
U.S. registry. We estimate the following costs to comply with this
proposed AD:

Estimated Costs
----------------------------------------------------------------------------------------------------------------
Action Labor cost Cost per product Cost on U.S. operators
----------------------------------------------------------------------------------------------------------------
Maintenance Program Revision..... 1 work-hour x $85 per $85 per test........ $57,460, per test.
hour = $85.
----------------------------------------------------------------------------------------------------------------

[[Page 14725]]

We have received no definitive data that would enable us to provide
a cost estimate for the on-condition actions or the optional
terminating action specified in this AD.

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 products identified in this
rulemaking action.

Regulatory Findings

We determined that this proposed AD would not have federalism
implications under Executive Order 13132. This proposed AD would 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 this proposed
regulation:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Is not a ``significant rule'' under the DOT Regulatory Policies
and Procedures (44 FR 11034, February 26, 1979),
(3) Will not affect intrastate aviation in Alaska, and
(4) 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.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.

The Proposed Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA proposes to amend 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 airworthiness
directive (AD):

The Boeing Company: Docket No. FAA-2008-0618; Directorate Identifier
2007-NM-355-AD.

(a) Comments Due Date

We must receive comments by April 22, 2013.

(b) Affected ADs

None.

This AD applies to all The Boeing Company Model 777-200, -200LR,
-300, and -300ER series airplanes, certificated in any category.

(d) Subject

Joint Aircraft System Component (JASC)/Air Transport Association
(ATA) of America Code 2800, Aircraft Fuel System.

(e) Unsafe Condition

This AD was prompted by reports of two in-service occurrences on
Model 737-400 airplanes of total loss of boost pump pressure of the
fuel feed system, followed by loss of fuel system suction feed
capability on one engine, and in-flight shutdown of the engine. We
are issuing this AD to detect and correct failure of the engine fuel
suction feed of the fuel system, which, in the event of total loss
of the fuel boost pumps, could result in dual engine flameout,
inability to restart the engines, and consequent forced landing of
the airplane.

(f) Compliance

Comply with this AD within the compliance times specified,
unless already done.

(g) Maintenance Program Revision

Within 90 days after the effective date of this AD: Revise the
maintenance program to incorporate the Airworthiness Limitation
(AWL) identified in Appendix 1 of this AD. The initial compliance
time for accomplishing AWL No. AWL-28-101 is within 7,500 flight
hours or 3 years after the effective date of this AD, whichever is
first.

(h) No Alternative Actions, Intervals, and/or Critical Design
Configuration Control Limitations (CDCCLs)

After accomplishing the revision required by paragraph (g) of
this AD, no alternative actions (e.g., tests), intervals, or CDCCLs
may be used unless the actions, intervals, or CDCCLs are approved as
an alternative method of compliance (AMOC) in accordance with the
procedures specified in paragraph (j) of this AD.

(i) Credit for Incorporating Previous Maintenance Program Revision

This paragraph provides credit for the actions required by
paragraph (g) of this AD, if those actions were performed before the
effective date of this AD using AWL No. 28-AWL-101, Engine Fuel
Suction Feed Operational Test, of Section D.2., AWLS--Fuel Systems
of Section 9, Airworthiness Limitations (AWLs) and Certification
Maintenance Requirements (CMRs), D622W001-9, Revision February 2012,
of the Boeing 777 Maintenance Planning Data (MPD) Document, provided
the revised ``interval'' specified in Appendix 1 of this AD is
incorporated into the existing maintenance program within 90 days
after the effective date of this AD.

(j) Alternative Methods of Compliance (AMOCs)

(1) The Manager, Seattle 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. In accordance with 14
CFR 39.19, send your request to your principal inspector or local
Flight Standards District Office, as appropriate. If sending
information directly to the manager of the ACO, send it to the
attention of the person identified in the Related Information
section of this AD. Information may be emailed to: 9-ANM-Seattle-ACO-AMOC-Requests@faa.gov.
(2) Before using any approved AMOC, notify your appropriate
principal inspector, or lacking a principal inspector, the manager
of the local flight standards district office/certificate holding
district office.

(k) Related Information

(1) For more information about this AD, contact Sue Lucier,
Aerospace Engineer, Propulsion Branch, ANM-140S, 1601 Lind Avenue
SW., Renton, Washington 98057-3356; phone: 425-917-6438; fax: 425-
917-6590; email: suzanne.lucier@faa.gov.
(2) For service information identified in this AD, contact
Boeing Commercial Airplanes, Attention: Data & Services Management,
P.O. Box 3707, MC 2H-65, Seattle, WA 98124-2207; telephone 206-544-
5000, extension 1; fax 206-766-5680; Internet https://www.myboeingfleet.com. You may review copies of the referenced
service information at the FAA, Transport Airplane Directorate, 1601
Lind Avenue SW., Renton, Washington. For information on the
availability of this material at the FAA, call 425-227-1221.

[[Page 14726]]

Appendix 1
----------------------------------------------------------------------------------------------------------------
AWL No. Task Interval Applicability Description
----------------------------------------------------------------------------------------------------------------
28-AWL-101....................... ALI...... 7,500 FH or 3 ALL................ Engine Fuel Suction Feed
years, whichever Operational Test.
is first.
An Engine Fuel Suction
Feed Operational Test
must be accomplished
successfully on each
engine individually.
This test is required in
order to protect against
engine flameout during
suction feed operations,
and must meet the
following requirements
(refer to Boeing AMM 28-
22-00):
Fuel Tank Quantity
Limitations:
Engine No. 1
a. The Center Tank
Fuel Quantity must
not exceed 5,000
lbs (2,270 kg).
b. The Main Tank
No. 1 Fuel
Quantity must be
between 1,400 lbs-
1,600 lbs (600 kg-
800 kg).
NOTE: Excess fuel
can be
transferred to
Main Tank No. 2.
Engine No. 2
a. The Center Tank
Fuel Quantity must
not exceed 5,000
lbs (2,270 kg).
b. The Main Tank
No. 2 Fuel
Quantity must be
between 1,400 lbs-
1,600 lbs (600 kg-
800 kg).
NOTE: Excess fuel
can be
transferred to
Main Tank No. 1.
Test Procedural
Limitations:
1. The Fuel Cross-
Feed Valve must be
CLOSED.
2. The APU Selector
Switch must be OFF.
3. Idle Engine Warm-
up time of minimum
two minutes with
Boost Pump ON.
4. Idle Engine
Suction Feed (Boost
Pump OFF) operation
for a minimum of
five minutes.
NOTE: APU may be used
to start the engines
provided the Fuel
Tank Quantity and
Test Procedural
Limitations are met.
The test is
considered a success
if engine operation
is maintained during
the five-minute
period and engine
parameters (N1, N2,
and Fuel Flow) do
not decay relative
to those observed
with Boost Pump ON.
A suction fee system
that fails the
operational test
must be repaired or
maintained, and
successfully pass
the Engine Suction
Feed Operational
Test prior to
further flight.
----------------------------------------------------------------------------------------------------------------

Directorate Identifier 2007-NM-355-AD

Issued in Renton, Washington, on February 15, 2013.
Kalene C. Yanamura,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 2013-05202 Filed 3-6-13; 8:45 am]
BILLING CODE 4910-13-P

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