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this AD in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact CFM International,
Technical Publications Department, 1 Neumann Way, Cincinnati, OH 45215; telephone (513) 552-
2800; fax (513) 552-2816, for a copy of this service information. You may review copies 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/ ibr-locations.html.
Table 1 – Incorporation by Reference
CFM56 Service Bulletin
No.
Page Revision Date
CFM56-5B S/B 77-0008
Total Pages: 34
All 3 April 4, 2005
CFM56-5 S/B 77-0020
Total Pages: 16
All 3 April 4, 2005
Issued in Burlington, Massachusetts, on January 31, 2007.
Peter A. White,
Acting Manager, Engine and Propeller Directorate, Aircraft Certification Service.
[FR Doc. E7-2068 Filed 2-9-07; 8:45 am]
2
20 BW 2007-04
FAA
Aircraft Certification Service
AIRWORTHINESS DIRECTIVE
www.faa.gov/aircraft/safety/alerts/
www.gpoaccess.gov/fr/advanced.html
2007-03-18 Airbus: Amendment 39-14929. Docket No. FAA-2007-27150; Directorate Identifier
2006-NM-288-AD.
Effective Date
(a) This airworthiness directive (AD) becomes effective February 23, 2007.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Airbus Model A300 and A300-600 airplanes; certificated in any category,
all certified models, all serial numbers except for those where LH (left-hand) and RH (right-hand)
wing MLG (main landing gear) rib 5 forward lugs have been repaired by installation of oversized
interference fit bushings as per drawing R57240221.
Reason
(d) The MCAI states that during routine visual inspection, a crack has been found in the wing
MLG rib 5 aft bearing forward lug on two Model A310 in-service aircraft. Laboratory examination of
one of the cracked ribs confirmed that the crack is due to the presence of pitting corrosion in the
forward lug holes. Also, on both aircraft medium to heavy corrosion was found in the forward lugs on
the opposite wing after removal of the bushings. On December 7, 2006, we issued AD 2007-02-09,
amendment 39-14896 (72 FR 2612, January 22, 2007), to address this unsafe condition on Model
A310 airplanes. Similar to Model A310 aircraft, the Model A300 and A300-600 aircraft are also
affected by this situation, which, if not detected, could affect the structural integrity of the MLG
attachment. The aim of the MCAI is to mandate repetitive detailed visual inspections of wing MLG
rib 5 aft bearing forward lugs for detection of through cracks and corrective action (contacting Airbus
and replacing cracked lugs if necessary). The MCAI notes that for Airbus Model A310 aircraft, refer
to EASA Emergency Airworthiness Directive 2006-0335-E, issued November 3, 2006.
Actions and Compliance
(e) Unless already done, do the following actions specified in paragraphs (e)(1), (e)(2), and (e)(3)
of this AD in accordance with instructions defined in Airbus Service Bulletin A300-57A6105, dated
December 12, 2006; or A300-57A0248, dated December 12, 2006; as applicable.
(1) Before the accumulation of 12,000 total flight cycles since new or since the most recent MLG
rib 5 replacement if applicable, or within 10 days after the effective date of this AD, whichever
occurs latest: Perform a detailed visual inspection of the LH and RH wing MLG rib 5 aft bearing
forward lugs.
2007-03-18 2
21 BW 2007-04
(2) If a crack is detected at the LH and/or RH aft bearing forward lug, contact Airbus
immediately and proceed with the replacement before further flight.
(3) Repeat the inspection at intervals not to exceed 100 flight cycles.
Other FAA AD Provisions
(f) The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): The Manager, International Branch, ANM-
116, Transport Airplane Directorate, FAA, ATTN: Tom Stafford, 1601 Lind Avenue, SW., Renton,
Washington 98057-3356, has the authority to approve AMOCs for this AD, if requested using the
procedures found in 14 CFR 39.19. Before using any AMOC approved in accordance with § 39.19 on
any airplane to which the AMOC applies, notify the appropriate principal inspector in the FAA Flight
Standards Certificate Holding District Office.
(2) Airworthy Product: For any requirement in this AD to obtain corrective actions from a
manufacturer or other source, use these actions if they are FAA-approved. Corrective actions are
considered FAA-approved if they are approved by the State of Design Authority (or their delegated
agent). You are required to assure the product is airworthy before it is returned to service.
　
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