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GENERAL ELECTRIC COMPANY:
Amendment 39-19368 Docket No. FAA-2018-0142; Product Identifier 2018-NE-04-AD.
(a) EFFECTIVE DATE This AD is effective November 7, 2018. (b) AFFECTED ADS None. (c) APPLICABILITY 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. (d) SUBJECT Joint Aircraft System Component (JASC) Code 7830, Thrust Reverser (e) UNSAFE CONDITION This AD was prompted by a report from GE regarding a quality escape of nonconforming thrust reverser fire seal gaps. We are issuing this AD to inspect for nonconforming thrust reverser fire seal gaps that could result in a fire outside the fire zone. The unsafe condition, if not addressed, could result in an uncontrolled fire, damage to the engine, and damage to the airplane. (f) COMPLIANCE Comply with this AD within the compliance times specified, unless already done. (g) REQUIRED ACTIONS (1) For all half thrust reversers listed in paragraph (c) of this AD, be- fore 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. (h) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS) (1) The Manager, ECO Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the certification office, send it to the attention of the person identified in paragraph (i) of this AD. You may email your request to: ANE-AD-AMOC@faa.gov. (2) Before using any approved AMOC, notify your appropriate principal in- spector, or lacking a principal inspector, the manager of the local Flight Standards District Office/Certificate Holding District Office. (i) RELATED INFORMATION For more information about this AD, contact David Bethka, Aerospace Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA, 01803 phone: 781-238-7129; fax: 781-238-7199; email: email@example.com. (j) MATERIAL INCORPORATED BY REFERENCE None. Issued in Burlington, Massachusetts, on September 26, 2018. Karen M. Grant, Acting Manager, Engine and Propeller Standards Branch, Aircraft Certification Service FOR FURTHER INFORMATION CONTACT: David Bethka, Aerospace Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA, 01803; phone: 781-238- 7129; fax: 781-238-7199; email: firstname.lastname@example.org.
DEPARTMENT OF TRANSPORTATION
We estimate the following costs to
do any necessary replacements
Authority for This Rulemaking