Airworthiness Directive · Amendment 39-21230 · Engine
Honeywell International Inc. Turbofan Engines
This AD applies to all Honeywell International Inc. (Honeywell) ALF502L, ALF502L-2, ALF502L-2A, ALF502L-2C, ALF502L-3, ALF502R-3, ALF502R-3A, ALF502R-4, ALF502R-5, ALF502R-6, LF507-1F, and LF507-1H model turbofan engines.
The FAA is adopting a new airworthiness directive (AD) for all Honeywell International Inc. (Honeywell) ALF502L, ALF502L-2, ALF502L- 2A, ALF502L-2C, ALF502L-3, ALF502R-3, ALF502R-3A, ALF502R-4, ALF502R-5, ALF502R-6, LF507-1F, and LF507-1H model turbofan engines. This AD was prompted by a report of an engine experiencing an uncontained release of low-pressure turbine (LPT) blades. This AD requires initial and repetitive visual inspections of the overspeed fuel solenoid valve assembly and the fuel filter outlet. Depending on the results of these inspections, the AD may require inspection of the adjacent fuel system tube assemblies as well as replacement or overhaul of the overspeed fuel solenoid valve assembly. This AD also requires periodic overhaul of the overspeed fuel solenoid valve assembly. The FAA is issuing this AD to address the unsafe condition on these products.
(1) Perform an initial visual inspection of the overspeed fuel solenoid valve assembly and fuel filter outlet in accordance with the Accomplishment Instructions, paragraphs 3.B.(1) to (3), of Honeywell Service Bulletin (SB) ALF/LF-72-1120, Revision 2, dated May 14, 2020 (“Honeywell SB ALF/LF-72-1120”), using the times, as applicable, in paragraphs (g)(1)(i), (ii), and (iii) of this AD.
(i) If, on the effective date of this AD, the fuel solenoid valve assembly has 1,500 or less engine cycles since last overhaul, perform the inspection before exceeding 3,000 engine cycles since last overhaul or within 5 years after the effective date of this AD, whichever occurs first.
(ii) If, on the effective date of this AD, the fuel solenoid valve assembly has greater than 1,500 but less than 3,000 engine cycles since last overhaul, perform the inspection before exceeding 3,500 engine cycles since last overhaul or within 5 years after the effective date of this AD, whichever occurs first.
(iii) If, on the effective date of this AD, the fuel solenoid valve assembly has 3,000 or more engine cycles since last overhaul, perform the inspection before exceeding 500 engine cycles or within 5 years after the effective date of this AD, whichever occurs first.
(2) Thereafter, repeat the visual inspection of the overspeed fuel solenoid valve assembly, fuel filter outlet, and adjacent fuel system tube assemblies at intervals not to exceed 3,000 engine cycles since the last visual inspection using the Accomplishment Instructions, paragraphs 3.B.(1) to (3), of Honeywell SB ALF/LF-72-1120.
(3) If, based on the visual inspection required by paragraph (g)(1) or (2) of this AD, an overspeed fuel solenoid valve assembly is rejected for visual coking or varnish residue, as depicted in the Accomplishment Instructions, paragraph 3.B.(3) of Honeywell SB ALF/LF-72-1120, before further flight:
(i) Remove and inspect the adjacent fuel system tube assemblies using the Accomplishment Instructions, paragraph 3.B.(3) of Honeywell SB ALF/LF-72-1120.
(ii) Overhaul the overspeed fuel solenoid valve assembly or replace it with a part eligible for installation using the Accomplishment Instructions, paragraphs 3.B.(5) to (8), of Honeywell SB ALF/LF-72-1120.
Note to paragraph (g)(3)(ii) of this AD: Valves may be serviced at any appropriately rated, FAA-approved repair facility.
(4) At the next engine shop visit after the effective date of this AD, and each shop visit thereafter, if the overspeed fuel solenoid valve assembly time since new or since last overhaul, whichever is less, exceeds 8,000 engine cycles or is unknown, overhaul the overspeed fuel solenoid valve assembly in accordance with the applicable Honeywell Temporary Revision (TR) for the engine, as defined in paragraph (h)(2) of this AD.
(1) For the purpose of this AD, a “part eligible for installation” is an overspeed fuel solenoid valve assembly including, but not limited to, P/Ns 2-303-175-01, 2-303-175-02, or 2-303-901-01.
(2) For the purpose of this AD, the “applicable Honeywell TR” refers, depending on the affected engine model, to the following engine model TRs:
(i) Honeywell TR No. 72-1022, dated October 14, 2019, to Honeywell Turbofan Aircraft Engine Manual Report No. 286.1, Revision 27, dated August 27, 2004, for Honeywell Engine Manual ALF502R;
(ii) Honeywell TR No. 72-202, dated October 10, 2019, to Honeywell Turbofan Aircraft Engine Manual 507F.1, Revision 6, dated August 16, 2013, for Honeywell Engine Manual LF507-1F;
(iii) Honeywell TR No. 72-177, dated October 10, 2019, to Honeywell Turbofan Aircraft Engine Manual Report No. 507H.1, Revision 5, dated September 30, 1999, for Honeywell Engine Manual LF507-1H; or
(iv) Honeywell TR No. 72-57, dated October 29, 2019, to Honeywell Turbofan Engine Overhaul Manual 72-07-07, Revision 1, dated January 31, 2001, for Honeywell Overhaul Manual ALF502L.
