Airworthiness Directive · Amendment 39-16141 · Honeywell International Inc. ALF502 Series and LF507 Series Turbofan Engines
Honeywell International Inc. ALF502 Series and LF507 Series Turbofan Engines
This AD applies to Honeywell International Inc. ALF502L and ALF502R series, and LF507-1F and LF507-1H turbofan engines with fuel manifolds, part numbers (P/Ns) 2-163-620-9, 2-163-620-10, 2-163-620-17, 2-163-620-18, 2-163-620-23, 2-163-620-24, 2-163-620-25, 2-163-620-26, 2-163-620-27, 2-163-620-28, 2-163-620-33, 2-163-620-34, 2-163-620-35, 2-163-620-36, 2-163-620-37, or 2-163-620-38, installed. These engines are installed on, but not limited to, Bombardier CL-600-1A11 and BAE Systems 146-100/A, -200/A, and -300/A, and AVRO 146-RJ70A, -RJ85A, and -RJ100A airplanes.
The FAA is superseding an existing airworthiness directive (AD) for Honeywell International Inc. ALF502 series and LF507 series turbofan engines with certain fuel manifold assemblies installed. That AD currently requires initial and repetitive on-wing eddy current or in-shop fluorescent penetrant inspections of certain part number (P/N) fuel manifold assemblies for cracks, and replacement of cracked fuel manifolds with serviceable manifolds. This AD continues to require inspecting those fuel manifolds for cracks, adds leak checks of certain additional P/N fuel manifolds, and specifies replacement of the affected manifolds as an optional terminating action in lieu of the repetitive inspections. This AD results from reports of fire in the engine nacelle. We are issuing this AD to detect cracks in certain fuel manifolds and fuel leaks from other fuel manifolds, which could result in a fire in the engine nacelle and a hazard to the aircraft.
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done.
Using the following compliance times, perform initial and repetitive on-wing eddy current inspections (ECI) or in-shop fluorescent penetrant inspections (FPI) of fuel manifold assemblies having a P/N listed in the paragraph (c) of this AD, except P/Ns 2-163-620-37 or 2-163-620-38. Use paragraphs 2.A.(1) through 2.A.(3)(d) of the accomplishment instructions of AlliedSignal Service Bulletin ALF/LF 73-1002, Revision 1, dated March 24, 1997 or original issue dated December 22, 1995, to perform the inspections.
(1) For ALF502L series engines:
(i) For fuel manifold assemblies with 3,250 or more cycles since new (CSN) or unknown CSN on July 28, 1997 (the effective date of AD 97-11-05), inspect at the next hot section inspection (HSI), or 2,000 cycles-in-service (CIS) after July 28, 1997, whichever occurs first.
(ii) For fuel manifold assemblies with less than 3,250 CSN on July 28, 1997, inspect at the next HSI or before accumulating 5,250 CSN, whichever occurs first.
(iii) Thereafter, inspect at HSI intervals not to exceed 2,000 cycles-since-last inspection (CSLI).
(iv) If a fuel manifold assembly is found cracked, prior to further flight, replace the fuel manifold assembly with an FAA-approved serviceable assembly.
(2) For ALF502R and LF507 series engines:
(i) For fuel manifold assemblies with 3,250 or more CSN, or unknown CSN, on July 28, 1997, inspect within 1,250 CIS after July 28, 1997.
(ii) For fuel manifold assemblies with less than 3,250 CSN on July 28, 1007, inspect prior to accumulating 4,500 CSN.
(iii) Thereafter, inspect at intervals not to exceed 1,250 CSLI.
(iv) If a fuel manifold assembly is found cracked, before further flight replace the fuel manifold assembly with an FAA-approved serviceable assembly.
For fuel manifold assemblies, P/Ns 2-163-620-37 or 2-163-620-38, with 1,800 or more CSN or cycles-since-overhaul (CSO), inspect for leaks within 300 CIS after the effective date of this AD as follows:
(1) Start engine and let stabilize at ground idle.
(2) With the engine operating, look for fuel leaking from the fuel manifold assembly to the fire shield interface area (see Figure 1 of this AD). No leaks allowed.
(3) If you find any leaks, shutdown the engine and replace the fuel manifold assembly with an FAA-approved serviceable assembly.
(4) Shut down engine.
(5) Look for fuel leaking from the fuel manifold assembly to the fire shield interface area (see Figure 1 of this AD). No leaks allowed.
(6) If you find any leaks, replace the fuel manifold assembly with an FAA-approved serviceable assembly.
Thereafter, within 600 CSLI, inspect fuel manifold assemblies, P/Ns 2-163-620-37 and 2-163-620-38, for leaks as specified in paragraphs (g)(1) through (g)(6) of this AD.
(i) Replacing a fuel manifold assembly that has a P/N specified in paragraph (c) of this AD with a fuel manifold assembly, P/N 2-163-620-39, 2-163-620-40, 2-163-620-41, or 2-163-620-42, or an FAA-approved equivalent part, terminates the inspection requirement of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
