Airworthiness directives › 2012-18-14
AD 2012-18-14 Airworthiness Directives; Pratt & Whitney Canada, Auxiliary Power Units
Applicability*9
This AD applies to Pratt & Whitney Canada (P&WC) PW901A auxiliary power units (APUs) approved under Technical Standard Order TSO-C77A and installed on, but not limited to, Boeing 747-400 series airplanes. The affected APU serial numbers are PCE 900001 through PCE 900776 inclusive.
Compliance
APUs modified before the effective date of this AD using P&WC Alert SB No. A16255R1, dated September 12, 2008, or P&WC Alert SB No. A16255, dated December 12, 2007, meet the modification requirements of this AD.
Required actions
The Manager, New York Aircraft Certification Office, FAA, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make your request.
Unsafe condition
Unless already done, do the following actions. (1) Within 42 months after the effective date of this AD or the first time the APU or module is at a maintenance facility that can perform the modifications, regardless of the maintenance action or reason for APU removal, whichever occurs first, modify the rear gas generator case, exhaust duct support, and turbine exhaust duct flanges. (2) Use paragraphs 3.A. through 3.B(3)(f) of Accomplishment Instructions, and paragraph 4.A. of Appendix, of P&WC Alert Service Bulletin (SB) No. 39100001-49-A16255, Revision No. 2, dated March 1, 2011, to do the modifications.
Affected ADs
None.
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