AD/LTS/17 - Compressor Impeller (Cth)

AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

AlliedSignal (Lycoming) Turbine Engines - LTS 101 Series

AD/LTS/17 Compressor Impeller 6/2002

Applicability: LTS 101Series turboshaft engines incorporating a centrifugal compressor impeller part numbers 4-101-052-57 or 4-101-052-62, except for impellers with serial numbers or part numbers listed in paragraphs 1.A. (1) through 1.A. (3) in Honeywell Service Bulletin (SB) LT 101-72-30-0186 Revision 1, or AlliedSignal SB LT 101-72-30- 0186.

Requirement: 1. Visual / Fluorescent Inspection: Conduct a one time visual inspection for surface finish, and fluorescent inspection of impellers as per the accomplishment instructions of Honeywell SB LT 101-72-30-0186 Revision 1, or AlliedSignal SB LT 101-72-30-0186.

2. Impeller Removal: Remove from service all impellers that exceed the acceptable limits of the accomplishment instructions of Honeywell SB LT 101- 72-30-0186 Revision 1, or AlliedSignal SB LT 101-72-30-0186.

3. Impeller Replacement: Impellers with part numbers as listed in applicability of this Directive shall not be fitted unless the inspection criteria of Honeywell SB LT 101-72-30-0186 Revision 1, or AlliedSignal SB LT 101-72-30-0186 is met.