Airworthiness Directive · Amendment 39-14026 · Boeing Model 777-200 and -300 Series Airplanes
Boeing Model 777-200 and -300 Series Airplanes
This AD applies to all Boeing Model 777-200 and -300 series airplanes; certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all Boeing Model 777-200 and -300 series airplanes. This AD requires inspection of the outer cylinder of the main landing gear (MLG) to determine the serial number; an ultrasonic inspection of the outer cylinder of the MLG for cracks if necessary; and applicable specified and corrective actions if necessary. This AD is prompted by reports indicating that two outer cylinders were found fractured in the weld area. We are issuing this AD to detect and correct cracks or defects that could result in a fracture of the outer cylinder of the MLG, which could lead to collapse of the MLG during landing.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
The term “the service bulletin,” as used in this AD, means the Accomplishment Instructions of Boeing Alert Service Bulletin 777-32A0038, Revision 1, dated February 19, 2004.
Perform the applicable actions specified in paragraph (h) of this AD at the later of the times specified in paragraphs (g)(1) and (g)(2) of this AD.
(1) Within 4,000 flight cycles or 750 days after the effective date of this AD, whichever occurs first; or
(2) Before accumulation of 8,000 total flight cycles on the outer cylinder or 72 months on the outer cylinder since new, whichever occurs first.
Inspect the outer cylinder of the MLG to determine whether an outer cylinder having a serial number (S/N) listed in paragraph 1.D., “Description,” of the service bulletin is installed. Instead of an inspection of the outer cylinder of the MLG, a review of airplane maintenance records is acceptable if the S/N of the outer cylinder can be positively determined from that review.
(1) If no S/N identified in the service bulletin is installed, no further action is required by this paragraph.
(2) If any S/N identified in the service bulletin is installed, at the applicable compliance time specified in paragraph (g) of this AD, do an ultrasonic inspection of the outer cylinder of the MLG for cracks, and do all applicable specified and corrective actions per the service bulletin. Do any applicable corrective action before further flight.
(i) Submit a report of any crack that is found during the inspection required by paragraph (h)(2) of this AD to the Manager, Seattle Aircraft Certification Office (ACO), FAA, 1601 Lind Avenue, SW., Renton, Washington, at the applicable time specified in paragraph (i)(1) or (i)(2) of this AD. The report must include the inspection results, a description of any discrepancies found, the outer cylinder serial number and part number, and the number of landings and flight hours on the outer cylinder. Under the provisions of the Paperwork Reduction Act of 1980 (44 U.S.C. 3501 et seq.), the Office of Management and Budget (OMB) has approved the information collection requirements contained in this AD and has assigned OMB Control Number 2120-0056.
(1) If the inspection was done after the effective date of this AD: Submit the report within 10 days after the inspection.
(2) If the inspection was accomplished prior to the effective date of this AD: Submit the report within 10 days after the effective date of this AD.
As of the effective date of this AD, no person may install an outer cylinder having a S/N listed in paragraph 1.D., “Description,” of the service bulletin on any airplane unless it has been inspected and all specified and corrective actions are accomplished in accordance with paragraph (h)(2) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
