Airworthiness Directive · Amendment 39-14882 · Boeing Model 747 Airplanes
Boeing Model 747 Airplanes
This AD applies to all Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes, certificated in any category.
The FAA is superseding an existing airworthiness directive (AD), which applies to all Boeing Model 747 airplanes. That AD currently requires a one-time inspection to determine whether the outer cylinder of the wing landing gear has certain part numbers, and replacement of the outer cylinder of the wing landing gear with a new, improved, or reworked part if necessary. That AD also requires removal of the load evening system, if such a system is installed. This new AD requires, for certain airplanes, an additional one-time inspection to determine whether the outer cylinder has a certain other part number. For those certain airplanes, this new AD also requires replacement of the outer cylinder with a reworked or new, improved part and related investigative and corrective actions, if necessary. This AD results from identification of an additional unsafe part. We are issuing this AD to prevent fracture of the outer cylinder of the wing landing gear, which could result in collapse of the wing landing gear.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 36 months after September 14, 2004 (the effective date of AD 2004-16-05), perform a one-time inspection to determine the part number (P/N) of the outer cylinder of the wing landing gear on both sides of the airplane, per the Accomplishment Instructions of Boeing Service Bulletin 747-32-2472, dated November 30, 2000; or Revision 1, dated February 23, 2006. Instead of inspecting the outer cylinder of the wing landing gear, a review of airplane maintenance records is acceptable if the detailed part number of the outer cylinder of the wing landing gear (not just a higher-level assembly) can be positively determined from that review.
(1) If no outer cylinder having P/N 65B01212-() (where “()” is any dash number of that part number), 65B01430-3, or 65B01430-4 is found: No further action is required by this paragraph.
(2) If any outer cylinder having P/N 65B01212-() (where “()” is any dash number of that part number), 65B01430-3, or 65B01430-4 is found: Accomplish paragraph (g) of this AD.
For any outer cylinder identified in paragraph (f)(2) of this AD: Within 36 months after September 14, 2004, replace the outer cylinder on the wing landing gear with a new, improved part or a part that has been inspected and reworked per the Accomplishment Instructions of Boeing Service Bulletin 747-32-2472, dated November 30, 2000; or Revision 1, dated February 23, 2006, except as provided by paragraph (k) of this AD. The rework procedures described in the service bulletin, if accomplished, include performing a one-time nital etch inspection of the upper inner surface of the outer cylinder for chrome plating; removing any chrome plating that is present; performing a one-time magnetic particle inspection for cracking of the outer cylinder; performing a nital etch inspection for heat damage of the outer cylinder; reworking the outer cylinder, as applicable; and marking the outer cylinder to indicate that the service bulletin has been accomplished.
For airplanes identified in Boeing Service Bulletin 747-32-2131, Revision 2, dated March 15, 1974: Before performing the requirements of paragraph (g) or (j) of this AD, as applicable, remove the load evening system installed on the wing and body landing gears, per the Accomplishment Instructions of the service bulletin.
(i) For Model 747-100, 747-100B, 747-100B SUD, and 747SR series airplanes: Within 36 months after the effective date of this AD, do a one-time inspection to determine the part number of the outer cylinder of the wing landing gear on both sides of the airplane, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 747-32-2472, Revision 1, dated February 23, 2006. Instead of inspecting the outer cylinder of the wing landing gear, a review of airplane maintenance records is acceptable if the detailed part number of the outer cylinder of the wing landing gear (not just a higher-level assembly) can be positively determined from that review.
(1) If no outer cylinder having P/N 65B01382-() is found: No further action is required by this paragraph.
(2) If any outer cylinder having P/N 65B01382-() is found: Accomplish paragraph (j) of this AD.
For any outer cylinder identified in paragraph (i)(2) of this AD: Within 36 months after the effective date of this AD, replace the outer cylinder on the wing landing gear with a new, improved part or with a part that has been reworked in accordance with the Accomplishment Instructions of Boeing Service Bulletin 747-32-2472, Revision 1, dated February 23, 2006, as applicable; except as provided by paragraph (k) of this AD. The rework, if applicable, must be done by accomplishing all of the related investigative actions and applicable corrective actions in paragraph 3.B.3. of the Accomplishment Instructions of the service bulletin. If applicable, do the actions specified in paragraph (h) of this AD before accomplishing the actions specified in this paragraph.
Where Boeing Service Bulletin 747-32-2472, Revision 1, dated February 23, 2006, specifies that the related investigative and corrective actions may be accomplished using an operator's “equivalent procedure:” The related investigative and corrective actions must be accomplished in accordance with the chapter(s) of the applicable Boeing 747 Standard Overhaul Practices Manual (SOPM) or Overhaul Manual (OHM) specified in the service bulletin.
As of September 14, 2004, no person may install, on any airplane, an outer cylinder of the wing landing gear if the outer cylinder has P/N 65B01212-(), 65B01430-3, or 65B01430-4, unless the outer cylinder has been inspected, reworked, and marked to indicate that Boeing Service Bulletin 747-32-2472, dated November 30, 2000; or Revision 1, dated February 23, 2006; has been accomplished. As of the effective date of this AD, no person may install an outer cylinder, P/N 65B01382-(), of the wing landing gear on any airplane, unless the outer cylinder has been inspected, reworked, and marked to indicate that Boeing Service Bulletin 747-32-2472, Revision 1, dated February 23, 2006, has been accomplished.
