Airworthiness Directive · Amendment 39-19368 · Thrust reverser
General Electric Company CF34-8E Engines
This AD applies to General Electric Company (GE) CF34-8E turbofan engines with:
(1) Left-hand (LH) half thrust reverser, part number (P/N) 15G0002-013, or LH half thrust reverser P/N 15G0002-014, with the following serial numbers (S/Ns): HRD00659 to HRD00662, HRD00675 to HRD00678, HRD00680, HRD00681, HRD00694 to HRD00697, HRD00711, HRD00831, HRD00856, HRD00878 to HRD00895, HRD01025, HRD01040, HRD01047, HRD01050 to HRD01057, HRD01059 to HRD01089, HRD01104, HRD01105, HRD01108, HRD01111 to HRD01116, HRD01118 to HRD01121, HRD01123, HRD01124, HRD01126, HRD01162, HRD01185 to HRD01198, HRD01201, HRD01202, or HRD01226 to HRD01243, installed.
(2) Right-hand (RH) half thrust reverser, P/N 15G0003-013, or RH half thrust reverser P/N 15G0003-014, with the following S/Ns: HRD00669 to HRD00678, HRD00680, HRD00681, HRD00703 to HRD00707, HRD00722, HRD00825, HRD00919, HRD00922, HRD01018, HRD01022, HRD01023, HRD01027 to HRD01033, HRD01035, HRD01036, HRD01038, HRD01039, HRD01041 to HRD01046, HRD01048, HRD01049, HRD01059 to HRD01079, HRD01081, HRD01082, HRD01084 to HRD01092, HRD01100, HRD01117, HRD01140, HRD01146, HRD01162, HRD01185 to HRD01187, HRD01189 to HRD01198, HRD01201, HRD01202, HRD01210, or HRD01213 to HRD01223, installed.
We are adopting a new airworthiness directive (AD) for certain General Electric Company (GE) CF34-8E turbofan engines. This AD was prompted by a report from GE regarding a quality escape of nonconforming thrust reverser fire seals. This AD requires a one-time inspection of the gap between the core cowl seal and the pylon seal of the thrust reverser for correct gap width, and replacement of the seals, if needed. We are issuing this AD to address the unsafe condition on these products.
(1) For all half thrust reversers listed in paragraph (c) of this AD, before the half thrust reverser accumulates 8,000 flight hours after the effective date of this AD, perform the following one-time inspection, and, if needed, replace the core cowl seal and pylon seal.
(i) Measure the width of the RTV filled gap between thrust reverser fire seals at the junction between 12 o'clock core cowl seal and pylon seal, at the following half thrust reverser locations: LH half thrust reverser, P/N 15G0002-013; LH half thrust reverser, P/N 15G0002-014; RH half thrust reverser, P/N 15G0003-013; and RH half thrust reverser P/N 15G0003-014.
(ii) If the gap width between the 12 o'clock core cowl seal and the pylon seal is greater than 1 mm, replace both seals with parts eligible for installation to form a new gap of 1 mm or less, prior to returning to service.
(2) You may refer to GE CF34-8E Service Bulletin 78-0066 R01, dated June 20, 2018, for guidance on inspecting and replacing the thrust reverser fire seals.
