AD 2006-03-05

The FAA is superseding an existing airworthiness directive (AD), which applies to all Short Brothers Model SD3-60 and SD3-SHERPA airplanes. That AD currently requires an inspection of the fork end of the rear pintle pin on each main landing gear (MLG) to verify that sealant is properly applied and is undamaged, and related investigative/corrective actions if necessary. This new AD requires an additional inspection for correctly applied sealant on the MLG rear pintle pin assemblies, and related investigative/corrective actions if necessary. This AD also expands the applicability of the existing AD. This AD results from a new report of a cracked pintle pin fork end. We are issuing this AD to prevent stress-corrosion cracking and subsequent failure of the MLG.

DATES: This AD becomes effective March 14, 2006.

The Director of the Federal Register approved the incorporation by reference of certain publications listed in the AD as of March 14, 2006.

On March 18, 1993 (58 FR 7983, February 11, 1993), the Director of the Federal Register approved the incorporation by reference of Shorts SD3-60 Service Bulletin SD360-32-33, dated August 7, 1992.

Final rule.

2006-03-05 Short Brothers PLC: Amendment 39-14469. Docket No. FAA- 2005-22875; Directorate Identifier 2005-NM-179-AD.

Effective Date

(a) This AD becomes effective March 14, 2006.

Affected ADs

(b) This AD supersedes AD 93-02-03.

Applicability

(c) This AD applies to all Shorts Model SD3-60 SHERPA, SD3- SHERPA, and SD3-60 airplanes, certificated in any category.

Unsafe Condition

(d) This AD results from a new report of a cracked pintle pin fork end. We are issuing this AD to prevent stress-corrosion cracking and subsequent failure of the main landing gear (MLG).

Compliance

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

Restatement of Requirements of AD 93-02-03

Inspection

(f) For Model SD3-60 and SD3-SHERPA airplanes: Within 300 hours' time-in-service or 30 days after March 18, 1993 (the effective date of AD 93-02-03),whichever occurs first, perform a visual inspection of the fork end of the rear pintle pin on each MLG to verify that an undamaged fillet of sealant is properly applied around the flanges of the bronze bushings, in accordance with Shorts SD3-60 Service Bulletin SD360-32-33, dated August 7, 1992.

(1) If an undamaged fillet of properly applied sealant is found: No further action is required by this AD.

(2) If no fillet of sealant is found at the joint line, or if a damaged fillet of sealant is found: Prior to the accumulation of 1,200 hours' time-in-service or 120 days after accomplishing the inspection required by paragraph (f) of this AD, whichever occurs first, remove the bushings and perform a magnetic non-destructive testing (NDT) inspection to detect faults of the bores in the fork end, in accordance with the service bulletin. If faults are found as a result of the NDT inspection, prior to further flight, repair the fork end of the rear pintle pin in a manner approved bythe Manager, International Branch, ANM-116, Transport Airplane Directorate, FAA.

New Requirements of This AD

Inspection

(g) For all airplanes: Within 3 months after the effective date of this AD, do a general visual inspection of the MLG rear pintle pin assemblies for correctly applied sealant, in accordance with Shorts Service Bulletin SD360-32-37, SD3 Sherpa-32-5, or SD360 Sherpa-32-4, all dated July 2004, as applicable.

(1) If the sealant is applied correctly: This AD requires no further work.

(2) If the sealant is applied incorrectly: Within 12 months after the effective date of this AD, do a magnetic flaw detection inspection to detect cracks of the rear pintle pin fork ends, in accordance with the service bulletin. If any cracked pintle pin fork end is found: Replace it before further flight with a serviceable part that has been inspected in accordance with the requirements of this AD.

Note 1: For the purposes of this AD, a general visual inspection is: "A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made from within touching distance unless otherwise specified. A mirror may be necessary to ensure visual access to all surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or droplight and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked."

Note 2: The service bulletins identified in paragraph (g) of this AD refer to Messier Dowty Special Inspection Service Bulletin 32-70SD, Revision 1, dated July 3, 1995, as an additional source of service information for the inspection and corrective actions.

(h) If any crack is detected during any inspection required by this AD and the service information specifies to contact themanufacturer for repair instructions: Before further flight, repair using a method approved by either the Manager, International Branch, ANM-116, Transport Airplane Directorate, FAA; or the Civil Aviation Authority (CAA) (or its delegated agent).

Alternative Methods of Compliance (AMOCs)

(i)(1) The Manager, International Branch, ANM-116, Transport Airplane Directorate, FAA, has the authority to approve AMOCs for this AD, if requested in accordance with the procedures found in 14 CFR 39.19.

(2) Before using any AMOC approved in accordance with Sec. 39.19 on any airplane to which the AMOC applies, notify the appropriate principal inspector in the FAA Flight Standards Certificate Holding District Office.

Related Information

(j) British airworthiness directive G-2004-0022, dated August 25, 2004, also addresses the subject of this AD.

Material Incorporated by Reference

(k) You must use the service information identified in Table 1 of this AD to perform the actions that are required by this AD, unless the AD specifies otherwise.

Table 1.--All Material Incorporated by Reference

Shorts service bulletin
Date
SD3 Sherpa 32 5, including Messier Dowty Special Inspection Service Bulletin 32 70SD, Revision 1, dated July 3, 1995
July 2004
SD360 Sherpa 32 4, including Messier Dowty Special Inspection Service Bulletin 32 70SD, Revision 1, dated July 3, 1995
July 2004.
SD360 32 33
August 7, 1992.
SD360 32 37, including Messier Dowty Special Inspection Service Bulletin 32 70SD, Revision 1, dated July 3, 1995
July 2004.

(1) The Director of the Federal Register approved the incorporation by reference of the documents identified in Table 2 of this AD in accordance with 5 U.S.C. 552(a) and 1 CFR part 51.

Table 2.--New Material Incorporated by Reference

Shorts service bulletin
Date
SD3 Sherpa 32 5, including Messier Dowty Special Inspection Service Bulletin 32 70SD, Revision 1, dated July 3, 1995 .
July 2004.SD360 Sherpa 32 4, including Messier Dowty Special Inspection Service Bulletin 32 70SD, Revision 1, dated July 3, 1995 .
July 2004.
SD360 32 37, including Messier Dowty Special Inspection Service Bulletin 32 70SD, Revision 1, dated July 3, 1995
July 2004.

(2) On March 18, 1993 (58 FR 7983, February 11, 1993), the Director of the Federal Register approved the incorporation by reference of Shorts SD3-60 Service Bulletin SD360-32-33, dated August 7, 1992.

(3) Contact Short Brothers, Airworthiness & Engineering Quality, P.O. Box 241, Airport Road, Belfast BT3 9DZ, Northern Ireland, for a copy of this service information. You may review copies at the Docket Management Facility, U.S. Department of Transportation, 400 Seventh Street SW., room PL-401, Nassif Building, Washington, DC; on the Internet at http://dms.dot.gov; or at the National Archives and Records Administration (NARA). For information on the availability of this material at the NARA, call (202) 741-6030, or goto http://www.archives.gov/federal--register/code--of--federal--regulations/ibr--locations.html.

Examining the Docket

You may examine the airworthiness directive (AD) docket on the Internet at http://dms.dot.gov or in person at the Docket Management Facility office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The Docket Management Facility office (telephone (800) 647-5227) is located on the plaza level of the Nassif Building at the street address stated in the ADDRESSES section.

Discussion

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to include an AD that supersedes AD 93-02-03, amendment 39- 8485 (58 FR 7983, February 11, 1993).

The existing AD applies to all Short Brothers Model SD3-60 and SD3- SHERPA airplanes. That NPRM was published in the Federal Register on November 9, 2005 (70 FR 67949). That NPRM proposed to continue to require an inspection of the fork end of the rear pintle pin on each main landing gear (MLG) to verify that sealant is properly applied and isundamaged, and related investigative/corrective actions if necessary. That NPRM also proposed to require an inspection for correctly applied sealant on the MLG rear pintle pin assemblies, and related investigative/corrective actions if necessary; it also proposed to expand the applicability of the existing AD.

Comments

We provided the public the opportunity to participate in the development of this AD. No comments have been received on the NPRM or on the determination of the cost to the public.

Conclusion

We have carefully reviewed the available data and determined that air safety and the public interest require adopting the AD as proposed.

Costs of Compliance

The following table provides the estimated costs for U.S. operators to comply with this AD.

Estimated Costs

Action
Work hours
Average labor rate per hour
Parts
Cost per airplane
Number of U.S. pregistered airplanes
Fleet cost
Inspection (required by AD 93 02 03)
1
$65
None$65
42
$2,730
Inspection (new action)
1
65
None
65
42
2,730

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 have determined that 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.

We prepared a regulatory evaluation of the estimated costs to comply with this AD and placed it in the AD docket. See the ADDRESSES section for a location to examine the regulatory evaluation.

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:

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

Sec. 39.13 [Amended]

2. The Federal Aviation Administration (FAA) amends Sec. 39.13 by removing amendment 39-8485 (58 FR 7983, February 11, 1993) and by adding the following new airworthiness directive (AD):