Airworthiness Directives; MD Helicopters, Inc. (MDHI) Helicopters, 65195-65198 [2013-25702]

Download as PDF Federal Register / Vol. 78, No. 211 / Thursday, October 31, 2013 / Rules and Regulations required by this AD if it is approved by the Boeing Commercial Airplanes Organization 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. DEPARTMENT OF TRANSPORTATION (k) Related Information RIN 2120–AA64 For more information about this AD, contact Suzanne Lucier, Aerospace Engineer, Propulsion Branch, ANM–140S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue SW., Renton, WA 98057–3356; phone: 425–917–6438; fax: 425–917–6590; email: suzanne.lucier@faa.gov. (1) The Director of the Federal Register approved the incorporation by reference (IBR) of the service information listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use this service information as applicable to do the actions required by this AD, unless the AD specifies otherwise. (i) Boeing Service Bulletin 727–28–0134, dated January 12, 2012. (ii) Critical Design Configuration Control Limitation (CDCCL) Task 57–AWL–01, ‘‘Impact-Resistant Fuel Tank Access Door,’’ of Section 1, Airworthiness Limitations (AWLs) of Boeing 727–100/200 Airworthiness Limitations (AWLs) Document D6–8766–AWL, Revision September 2012. (3) 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. (4) You may view this service information at 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. (5) You may view this service information that is incorporated by reference 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: http:// www.archives.gov/federal-register/cfr/ibrlocations.html. wreier-aviles on DSK5TPTVN1PROD with RULES Issued in Renton, Washington, on October 15, 2013. Jeffrey E. Duven, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. BILLING CODE 4910–13–P VerDate Mar<15>2010 15:19 Oct 30, 2013 Jkt 232001 14 CFR Part 39 [Docket No. FAA–2013–0486; Directorate Identifier 2010–SW–031–AD; Amendment 39–17622; AD 2013–20–16] Airworthiness Directives; MD Helicopters, Inc. (MDHI) Helicopters Federal Aviation Administration (FAA), DOT. ACTION: Final rule. AGENCY: We are adopting a new airworthiness directive (AD) for MDHI Model MD900 helicopters with certain main rotor blade (MRB) retention bolts (bolts) installed. This AD requires a daily check of the position of each bolt, a daily check and a repetitive inspection for a gap in each bolt, and, if necessary, removing and inspecting the bolt for a crack and replacing any cracked bolt with an airworthy bolt. This AD was prompted by multiple reports of inservice bolt failures. The actions are intended to prevent failure of a bolt, which could lead to loss of MRB structural integrity and subsequent loss of control of the helicopter. DATES: This AD is effective December 5, 2013. ADDRESSES: For service information identified in this AD, contact MDHI, Attn: Customer Support Division, 4555 E. McDowell Rd., Mail Stop M615, Mesa, AZ 85215–9734, telephone (800) 388–3378, fax (480) 346–6813, or at http://www.mdhelicopters.com. You may review a copy of the referenced service information at the FAA, Office of the Regional Counsel, Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas 76137. SUMMARY: (l) Material Incorporated by Reference [FR Doc. 2013–25132 Filed 10–30–13; 8:45 am] Federal Aviation Administration Examining the AD Docket You may examine the AD docket on the Internet at http:// www.regulations.gov or in person at the Docket Operations Office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this AD, the economic evaluation, any comments received, and other information. The street address for the Docket Operations Office (phone: 800–647–5527) is U.S. Department of Transportation, Docket Operations Office, M–30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue SE., Washington, DC 20590. FOR FURTHER INFORMATION CONTACT: Roger Durbin, Aerospace Engineer, FAA, Los Angeles Aircraft Certification PO 00000 Frm 00051 Fmt 4700 Sfmt 4700 65195 Office, Airframe Branch, ANM–120L, 3960 Paramount Blvd., Lakewood, CA 90712, telephone (562) 627–5233, fax (562) 627–5210, email roger.durbin@ faa.gov. SUPPLEMENTARY INFORMATION: Discussion On June 14, 2013, at 78 FR 35773, the Federal Register published our notice of proposed rulemaking (NPRM), which proposed to amend 14 CFR part 39 to add an AD that would apply to MDHI Model MD900 helicopters with certain bolts installed. The NPRM proposed to require a daily check of the position of each bolt, a daily check and a repetitive inspection for a gap in each bolt, and, if necessary, removing and inspecting the bolt for a crack and replacing any cracked bolt with an airworthy bolt. The NPRM was prompted by multiple reports of in-service bolt failures. The proposed requirements were intended to prevent failure of a bolt, which could lead to loss of MRB structural integrity and subsequent loss of control of the helicopter. Comments We gave the public the opportunity to participate in developing this AD, but we did not receive any comments on the NPRM (78 FR 35773, June 14, 2013). FAA’s Determination We have reviewed the relevant information and determined that an unsafe condition exists and is likely to exist or develop on other helicopters of the same type designs and that air safety and the public interest require adopting the AD requirements as proposed. Related Service Information MDHI issued Alert Service Bulletin SB900–116R1, dated April 9, 2010 (ASB SB900–116R1), which supersedes ASB SB900–116, dated February 24, 2010 (ASB SB900–116). ASB SB900–116 specifies a repetitive check of the blade retention bolts, part number (P/N) 900R3100001–103 and 900R3100001–105, for a gap and, depending on the outcome of the inspection, removing and inspecting the bolt for damage. The ASB also specifies a repetitive force check of each bolt, P/ N 900R3100001–103, and a torque check of each bolt, P/N 900R3100001– 105. Lastly, the ASB specifies a daily preflight check of each bolt to examine the position of the bolt and for a gap, and, if any bolt has moved up or down or if there was no gap, removing and inspecting the bolt. Superseding ASB SB900–116R1 retains the same specifications as ASB SB90016, except that it revises the E:\FR\FM\31OCR1.SGM 31OCR1 65196 Federal Register / Vol. 78, No. 211 / Thursday, October 31, 2013 / Rules and Regulations because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action. interval for the bolt force and torque checks from 4–6 flight-hours to 8–10 flight-hours. ASB SB90016R1 also revises the change of force or torque from not more than 10 percent to not more than ±10 percent. Differences Between This AD and the Service Information This AD uses the term ‘‘inspect’’ when describing the action of inspecting a bolt for a crack and inspecting for a gap between the thrust washer and the retainer. The ASB uses the term ‘‘check.’’ Costs of Compliance We estimate that this AD will affect 29 helicopters in the U.S. registry. We estimate that operators may incur the following costs to comply with this AD: The average labor rate is $85 per work hour. It will take about .5 work hour to do a gap inspection of each bolt. It will take about 1 work hour to replace a cracked bolt and the required parts will cost $800 at a total cost per helicopter of $928. wreier-aviles on DSK5TPTVN1PROD with RULES 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 VerDate Mar<15>2010 15:19 Oct 30, 2013 Jkt 232001 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); (3) Will not affect intrastate aviation in Alaska to the extent that it justifies making a regulatory distinction; 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. We prepared an economic evaluation of the estimated costs to comply with this AD and placed it in the AD docket. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, 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: ■ PO 00000 Frm 00052 Fmt 4700 Sfmt 4700 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): ■ 2013–20–16 MD Helicopters, Inc. (MDHI): Amendment 39–17622; Docket No. FAA–2013–0486; Directorate Identifier 2010–SW–031–AD. (a) Applicability This AD applies to Model MD 900 helicopters with a main rotor blade retention bolt (bolt), part number (P/N) 900R3100001– 103 or 900R3100001–105, installed; certificated in any category. (b) Unsafe Condition This AD defines the unsafe condition as bolt failure. This condition could result in loss of main rotor blade structural integrity and subsequent loss of control of the helicopter. (c) Effective Date This AD becomes effective December 5, 2013. (d) Compliance You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time. (e) Required Actions (1) Before the first flight of each day: (i) Visually check each bolt for failure. Failure of a bolt may be indicated by movement of the bolt out of the bolt hole or by inconsistent extension of the bolt above or below the other bolts being inspected (a failed bolt migrates out of the bolt hole). (ii) Visually check for a gap between the thrust washer and the retainer, P/N 900R2100009–101 or –103. The thrust washer is depicted as item 2 and the retainer is depicted as item 8 in Figure 1 to paragraph (e) of this AD. BILLING CODE 4910–13–P E:\FR\FM\31OCR1.SGM 31OCR1 Federal Register / Vol. 78, No. 211 / Thursday, October 31, 2013 / Rules and Regulations (iii) The actions required by paragraphs (e)(1)(i) and (e)(1)(ii) may be performed by the owner/operator (pilot) holding at least a private pilot certificate and must be entered into the aircraft maintenance records showing compliance with this AD in accordance with 14 CFR 43.9(a)(1)–(4) and 14 CFR 91.417(a)(2)(v). The record must be maintained as required by 14 CFR 91.417, 121.380, or 135.439. (iv) If there is any indication of bolt failure or if there is no gap between the thrust washer and retainer, before further flight, remove and inspect the bolt for a crack. Replace any cracked bolt with an airworthy bolt. VerDate Mar<15>2010 15:19 Oct 30, 2013 Jkt 232001 (2) Within 300 hours time-in-service (TIS), and thereafter at intervals not to exceed 300 hours TIS, inspect each bolt for a gap between the thrust washer and the retainer. (i) Determine whether an O-ring is installed. Install any missing O-ring. (ii) If there is no gap between the thrust washer and retainer, before further flight, remove and inspect the bolt for a crack. Replace any cracked bolt with an airworthy bolt. (iii) If there is a gap between the thrust washer and retainer, measure the gap in two locations, 180 degrees apart, with a feeler gage. If the gap is more than 0.100 inch (2.54 mm) at either location, before further flight, PO 00000 Frm 00053 Fmt 4700 Sfmt 4700 remove and inspect the bolt for a crack. Replace any cracked bolt with an airworthy bolt. (f) Alternative Methods of Compliance (AMOCs) (1) The Manager, Los Angeles Aircraft Certification Office, Airframe Branch (ANM– 120L), FAA, may approve AMOCs for this AD. Send your request to Roger Durbin, Aerospace Engineer, FAA, Los Angeles Aircraft Certification Office, Airframe Branch, ANM–120L, 3960 Paramount Blvd., Lakewood, CA 90712, telephone (562) 627– 5233, fax (562) 627–5210, email roger.durbin@faa.gov. E:\FR\FM\31OCR1.SGM 31OCR1 ER31OC13.000</GPH> wreier-aviles on DSK5TPTVN1PROD with RULES BILLING CODE 4910–13–C 65197 65198 Federal Register / Vol. 78, No. 211 / Thursday, October 31, 2013 / Rules and Regulations (2) For operations conducted under a 14 CFR part 119 operating certificate or under 14 CFR part 91, subpart K, we suggest that you notify your principal inspector or lacking a principal inspector, the manager of the local flight standards district office or certificate holding district office before operating any aircraft complying with this AD through an AMOC. (g) Additional Information MDHI Alert Service Bulletin SB900–116R1, dated April 9, 2010, which supersedes MDHI Alert Service Bulletin SB SB900–116, dated February 24, 1010, neither of which is incorporated by reference, contains additional information about the subject of this AD. For service information identified in this AD, contact MDHI, Attn: Customer Support Division, 4555 E. McDowell Rd., Mail Stop M615, Mesa, AZ 85215–9734, telephone (800) 388–3378, fax (480) 346– 6813, or at http://www.mdhelicopters.com. You may review copies of the service information at the FAA, Office of the Regional Counsel, Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas. (h) Subject Joint Aircraft System Component: 6210: Main rotor blade retention bolts. Issued in Fort Worth, Texas, on September 27, 2013. Lance T. Gant, Acting Directorate Manager, Rotorcraft Directorate, Aircraft Certification Service. [FR Doc. 2013–25702 Filed 10–30–13; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2012–0594; Directorate Identifier 2012–NM–019–AD; Amendment 39–17641; AD 2013–22–09] RIN 2120–AA64 Airworthiness Directives; Bombardier, Inc. Airplanes Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Final rule. AGENCY: We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model DHC–8–400, –401, and –402 airplanes. This AD was prompted by reports of movement of the rudder pedals being impeded due to corrosion of the trunnion shaft of the rudder feel trim unit (RFTU). This AD requires an inspection to determine if certain RFTUs are installed, an operational check for signs of seizure of affected parts, repetitive lubrication of certain RFTUs, and replacement of the wreier-aviles on DSK5TPTVN1PROD with RULES SUMMARY: VerDate Mar<15>2010 15:19 Oct 30, 2013 Jkt 232001 RFTU if necessary. Installing replacement RFTUs having conformal bushings terminates the repetitive lubrication requirements. We are issuing this AD to detect and correct any sign of rough movement or seizure of the trunnion shaft and its bushing, which could cause a rudder control jam or a large and rapid alternating rudder input leading to a structural failure of the vertical fin. DATES: This AD becomes effective December 5, 2013. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of December 5, 2013. ADDRESSES: You may examine the AD docket on the Internet at http:// www.regulations.gov/ #!docketDetail;D=FAA-2012-0594 or in person at the U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue SE., Washington, DC. For service information identified in this AD, contact Bombardier, Inc., QSeries Technical Help Desk, 123 Garratt Boulevard, Toronto, Ontario M3K 1Y5, Canada; telephone 416–375–4000; fax 416–375–4539; email thd.qseries@ aero.bombardier.com; Internet http:// www.bombardier.com. You may view this referenced 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. FOR FURTHER INFORMATION CONTACT: Cesar Gomez, Aerospace Engineer, Airframe and Mechanical Systems Branch, ANE–171, FAA, New York Aircraft Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New York 11590; telephone (516) 228– 7318; fax (516) 794–5531. SUPPLEMENTARY INFORMATION: Discussion We issued a supplemental notice of proposed rulemaking (SNPRM) to amend 14 CFR part 39 by adding an AD that would apply to the specified products. The SNPRM was published in the Federal Register on March 12, 2013 (78 FR 15655). We preceded the SNPRM with a notice of proposed rulemaking (NPRM), which published in the Federal Register on June 12, 2012 (77 FR 34874). The NPRM and the SNPRM both proposed to correct an unsafe condition for the specified products. Transport Canada Civil Aviation (TCCA), which is the aviation authority for Canada, has issued Canadian Airworthiness Directive CF–2012–02R1, PO 00000 Frm 00054 Fmt 4700 Sfmt 4700 dated October 12, 2012 (referred to after this as the Mandatory Continuing Airworthiness Information, or ‘‘the MCAI’’), to correct an unsafe condition for the specified products. The MCAI states: There have been several reported incidents on DHC–8 Series 400 aeroplanes where the movement of the rudder pedals has been impeded. An investigation showed that the Rudder Feel Trim Unit (RFTU) trunnion shaft was corroded. The root cause of the corrosion was a quality escape where cadmium plating on the trunnion bushing within the RFTU assembly was not removed. Corrosion on the shaft and in the trunnion bushing seized the trunnion and caused difficulties in controlling the rudder movement. This condition, if not corrected, could cause a rudder control jam or a large and rapid alternating rudder input leading to a structural failure of the vertical fin. This [TCCA] Airworthiness Directive (AD) is issued [inspect to determine serial number, an operational check for seizure, repetitive lubrication and] to replace the affected RFTUs to limit the possibility of binding and replace the affected RFTUs with units that have been reworked with conformal bushings to terminate the lubrication requirements. You may examine the MCAI in the AD docket on the Internet at http:// www.regulations.gov/ #!documentDetail;D=FAA-2012-05940006. Comments We gave the public the opportunity to participate in developing this AD. We considered the comments received. Request To Revise Compliance Time for Operational Check Horizon Air (Horizon) requested that paragraph (g)(2) of the SNPRM (78 FR 15655, March 12, 2013) be revised to allow operators that perform a review of airplane maintenance records, in lieu of visually inspecting the serial number of the RFTU, time to schedule the operational check specified by paragraph (g)(2) of the SNPRM. Horizon stated that the compliance time ‘‘before further flight’’ specified in paragraph (g)(2) of the SNPRM would immediately ground aircraft. We agree with Horizon’s request. We have revised the compliance time in paragraph (g)(2) of this final rule to ‘‘200 flight hours or 2 months, whichever occurs first after the effective date of this AD’’ for performing the operational check specified in that paragraph. Explanation of Changes Made to This AD We have revised paragraph (h) of this final rule to specify that installing replacement RFTUs having conformal bushings terminates the repetitive lubrication requirements of paragraph E:\FR\FM\31OCR1.SGM 31OCR1

Agencies

[Federal Register Volume 78, Number 211 (Thursday, October 31, 2013)]
[Rules and Regulations]
[Pages 65195-65198]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2013-25702]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2013-0486; Directorate Identifier 2010-SW-031-AD; 
Amendment 39-17622; AD 2013-20-16]
RIN 2120-AA64


Airworthiness Directives; MD Helicopters, Inc. (MDHI) Helicopters

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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

SUMMARY: We are adopting a new airworthiness directive (AD) for MDHI 
Model MD900 helicopters with certain main rotor blade (MRB) retention 
bolts (bolts) installed. This AD requires a daily check of the position 
of each bolt, a daily check and a repetitive inspection for a gap in 
each bolt, and, if necessary, removing and inspecting the bolt for a 
crack and replacing any cracked bolt with an airworthy bolt. This AD 
was prompted by multiple reports of in-service bolt failures. The 
actions are intended to prevent failure of a bolt, which could lead to 
loss of MRB structural integrity and subsequent loss of control of the 
helicopter.

DATES: This AD is effective December 5, 2013.

ADDRESSES: For service information identified in this AD, contact MDHI, 
Attn: Customer Support Division, 4555 E. McDowell Rd., Mail Stop M615, 
Mesa, AZ 85215-9734, telephone (800) 388-3378, fax (480) 346-6813, or 
at http://www.mdhelicopters.com. You may review a copy of the 
referenced service information at the FAA, Office of the Regional 
Counsel, Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, 
Texas 76137.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://www.regulations.gov or in person at the Docket Operations Office 
between 9 a.m. and 5 p.m., Monday through Friday, except Federal 
holidays. The AD docket contains this AD, the economic evaluation, any 
comments received, and other information. The street address for the 
Docket Operations Office (phone: 800-647-5527) is U.S. Department of 
Transportation, Docket Operations Office, M-30, West Building Ground 
Floor, Room W12-140, 1200 New Jersey Avenue SE., Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Roger Durbin, Aerospace Engineer, FAA, 
Los Angeles Aircraft Certification Office, Airframe Branch, ANM-120L, 
3960 Paramount Blvd., Lakewood, CA 90712, telephone (562) 627-5233, fax 
(562) 627-5210, email roger.durbin@faa.gov.

SUPPLEMENTARY INFORMATION:

Discussion

    On June 14, 2013, at 78 FR 35773, the Federal Register published 
our notice of proposed rulemaking (NPRM), which proposed to amend 14 
CFR part 39 to add an AD that would apply to MDHI Model MD900 
helicopters with certain bolts installed. The NPRM proposed to require 
a daily check of the position of each bolt, a daily check and a 
repetitive inspection for a gap in each bolt, and, if necessary, 
removing and inspecting the bolt for a crack and replacing any cracked 
bolt with an airworthy bolt. The NPRM was prompted by multiple reports 
of in-service bolt failures. The proposed requirements were intended to 
prevent failure of a bolt, which could lead to loss of MRB structural 
integrity and subsequent loss of control of the helicopter.

Comments

    We gave the public the opportunity to participate in developing 
this AD, but we did not receive any comments on the NPRM (78 FR 35773, 
June 14, 2013).

FAA's Determination

    We have reviewed the relevant information and determined that an 
unsafe condition exists and is likely to exist or develop on other 
helicopters of the same type designs and that air safety and the public 
interest require adopting the AD requirements as proposed.

Related Service Information

    MDHI issued Alert Service Bulletin SB900-116R1, dated April 9, 2010 
(ASB SB900-116R1), which supersedes ASB SB900-116, dated February 24, 
2010 (ASB SB900-116).
    ASB SB900-116 specifies a repetitive check of the blade retention 
bolts, part number (P/N) 900R3100001-103 and 900R3100001-105, for a gap 
and, depending on the outcome of the inspection, removing and 
inspecting the bolt for damage. The ASB also specifies a repetitive 
force check of each bolt, P/N 900R3100001-103, and a torque check of 
each bolt, P/N 900R3100001-105. Lastly, the ASB specifies a daily 
preflight check of each bolt to examine the position of the bolt and 
for a gap, and, if any bolt has moved up or down or if there was no 
gap, removing and inspecting the bolt.
    Superseding ASB SB900-116R1 retains the same specifications as ASB 
SB90016, except that it revises the

[[Page 65196]]

interval for the bolt force and torque checks from 4-6 flight-hours to 
8-10 flight-hours. ASB SB90016R1 also revises the change of force or 
torque from not more than 10 percent to not more than 10 
percent.

Differences Between This AD and the Service Information

    This AD uses the term ``inspect'' when describing the action of 
inspecting a bolt for a crack and inspecting for a gap between the 
thrust washer and the retainer. The ASB uses the term ``check.''

Costs of Compliance

    We estimate that this AD will affect 29 helicopters in the U.S. 
registry. We estimate that operators may incur the following costs to 
comply with this AD: The average labor rate is $85 per work hour. It 
will take about .5 work hour to do a gap inspection of each bolt. It 
will take about 1 work hour to replace a cracked bolt and the required 
parts will cost $800 at a total cost per helicopter of $928.

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

    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);
    (3) Will not affect intrastate aviation in Alaska to the extent 
that it justifies making a regulatory distinction; 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.
    We prepared an economic evaluation of the estimated costs to comply 
with this AD and placed it in the AD docket.

List of Subjects in 14 CFR Part 39

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

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):

2013-20-16 MD Helicopters, Inc. (MDHI): Amendment 39-17622; Docket 
No. FAA-2013-0486; Directorate Identifier 2010-SW-031-AD.

(a) Applicability

    This AD applies to Model MD 900 helicopters with a main rotor 
blade retention bolt (bolt), part number (P/N) 900R3100001-103 or 
900R3100001-105, installed; certificated in any category.

 (b) Unsafe Condition

    This AD defines the unsafe condition as bolt failure. This 
condition could result in loss of main rotor blade structural 
integrity and subsequent loss of control of the helicopter.

 (c) Effective Date

    This AD becomes effective December 5, 2013.

(d) Compliance

    You are responsible for performing each action required by this 
AD within the specified compliance time unless it has already been 
accomplished prior to that time.

(e) Required Actions

    (1) Before the first flight of each day:
    (i) Visually check each bolt for failure. Failure of a bolt may 
be indicated by movement of the bolt out of the bolt hole or by 
inconsistent extension of the bolt above or below the other bolts 
being inspected (a failed bolt migrates out of the bolt hole).
    (ii) Visually check for a gap between the thrust washer and the 
retainer, P/N 900R2100009-101 or -103. The thrust washer is depicted 
as item 2 and the retainer is depicted as item 8 in Figure 1 to 
paragraph (e) of this AD.
BILLING CODE 4910-13-P

[[Page 65197]]

[GRAPHIC] [TIFF OMITTED] TR31OC13.000

BILLING CODE 4910-13-C
    (iii) The actions required by paragraphs (e)(1)(i) and 
(e)(1)(ii) may be performed by the owner/operator (pilot) holding at 
least a private pilot certificate and must be entered into the 
aircraft maintenance records showing compliance with this AD in 
accordance with 14 CFR 43.9(a)(1)-(4) and 14 CFR 91.417(a)(2)(v). 
The record must be maintained as required by 14 CFR 91.417, 121.380, 
or 135.439.
    (iv) If there is any indication of bolt failure or if there is 
no gap between the thrust washer and retainer, before further 
flight, remove and inspect the bolt for a crack. Replace any cracked 
bolt with an airworthy bolt.
    (2) Within 300 hours time-in-service (TIS), and thereafter at 
intervals not to exceed 300 hours TIS, inspect each bolt for a gap 
between the thrust washer and the retainer.
    (i) Determine whether an O-ring is installed. Install any 
missing O-ring.
    (ii) If there is no gap between the thrust washer and retainer, 
before further flight, remove and inspect the bolt for a crack. 
Replace any cracked bolt with an airworthy bolt.
    (iii) If there is a gap between the thrust washer and retainer, 
measure the gap in two locations, 180 degrees apart, with a feeler 
gage. If the gap is more than 0.100 inch (2.54 mm) at either 
location, before further flight, remove and inspect the bolt for a 
crack. Replace any cracked bolt with an airworthy bolt.

(f) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, Los Angeles Aircraft Certification Office, 
Airframe Branch (ANM-120L), FAA, may approve AMOCs for this AD. Send 
your request to Roger Durbin, Aerospace Engineer, FAA, Los Angeles 
Aircraft Certification Office, Airframe Branch, ANM-120L, 3960 
Paramount Blvd., Lakewood, CA 90712, telephone (562) 627-5233, fax 
(562) 627-5210, email roger.durbin@faa.gov.

[[Page 65198]]

    (2) For operations conducted under a 14 CFR part 119 operating 
certificate or under 14 CFR part 91, subpart K, we suggest that you 
notify your principal inspector or lacking a principal inspector, 
the manager of the local flight standards district office or 
certificate holding district office before operating any aircraft 
complying with this AD through an AMOC.

(g) Additional Information

    MDHI Alert Service Bulletin SB900-116R1, dated April 9, 2010, 
which supersedes MDHI Alert Service Bulletin SB SB900-116, dated 
February 24, 1010, neither of which is incorporated by reference, 
contains additional information about the subject of this AD. For 
service information identified in this AD, contact MDHI, Attn: 
Customer Support Division, 4555 E. McDowell Rd., Mail Stop M615, 
Mesa, AZ 85215-9734, telephone (800) 388-3378, fax (480) 346-6813, 
or at http://www.mdhelicopters.com. You may review copies of the 
service information at the FAA, Office of the Regional Counsel, 
Southwest Region, 2601 Meacham Blvd., Room 663, Fort Worth, Texas.

 (h) Subject

    Joint Aircraft System Component: 6210: Main rotor blade 
retention bolts.

    Issued in Fort Worth, Texas, on September 27, 2013.
Lance T. Gant,
Acting Directorate Manager, Rotorcraft Directorate, Aircraft 
Certification Service.
[FR Doc. 2013-25702 Filed 10-30-13; 8:45 am]
BILLING CODE 4910-13-P