AD 2020-18-09 Airworthiness Directives; 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.

Comply with this AD within the compliance times specified, unless already done.

(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.

This AD was prompted by a report of an engine experiencing an uncontained release of low-pressure turbine (LPT) blades. The FAA is issuing this AD to prevent failure of the LPT blades. The unsafe condition, if not addressed, could result in uncontained LPT blade release, damage to the engine, and loss of the aircraft.

None.