AD/Al 250/91 Engine Compressor Module Removal from Service (Cth)

AIRWORTHINESS DIRECTIVE

On the commencement date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001 (1) of CASR. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct an 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.

Rolls-Royce (Allison) Turbine Engines - 250 Series

AD/AL 250/91 Engine Compressor Module - Removal
from Service 6/2020

Applicability:

All Rolls-Royce Allison 250 series engines.

Requirement:

1.    Review engine logbooks and determine if a compressor module with a serial number listed in Table 1 is installed in the engine.

2.    Remove any affected compressor module from service.

Table 1: affected compressor modules

C20B series engines	C20R series engines	C28 series engines	C30 series engines	C47 series engines
Affected Compressor Module Serial Numbers:
CAC23900 CAC30243 CAC30972 CAC31216 CAC31394 CAC32128 CAC33247 CAC33931 CAC34205 CAC35463 CAC36132 CAC37795 CAC37814 CAC37978 CAC38521 CAC39053 CAC40093 CAC40446 CAC40483 CAC40560 CAC41262 CAC41846 CAC41917 KR86023 CAC42465	CAC15280 CAC15850 CAC15973 CAC 28209	CAC28017 CAC28022 CAC28119 CAC70026 CAC70779	CAC28046 CAC90011 CAC90052 CAC90069 CAC90507 CAC90719 CAC91305 CAC91311 CAC91507 CAC91607 CAC91623 CAC91635 CAC91820 CAC98516 CAC98537	CAC44294 CAC45072

3.    All affected compressor modules must be returned to an approved maintenance organisation for repair in accordance with Rolls-Royce approved overhaul or repair data.

Compliance:

1.    Before further flight.

2.a.  For C20B and C20R series engines: Before further flight.

2.b. For C28, C30 and C47 series engines: the earlier of the following:

(i)    within 50 hours’ time in service,

(ii)   12 April 2020,

(iii) next engine shop visit.

3.    Before returning to service.

            For aircraft located away from a maintenance facility, a special flight permit may be issued for one non-revenue ferry flight to return the aircraft to the nearest maintenance facility to carry out the requirements of this AD.

            CASA is to be notified of any engines found to have an affected module fitted via the Defect Reporting Service.

Note:  Civil Aviation Authority of New Zealand (CAA NZ) Airworthiness Directive DCA/AL250/60 has been referenced as a source document for Table 1.

This AD commences on 17 March 2020.

Background:

A recent audit of a New Zealand maintenance organisation by CAA NZ has determined that compressor module inspections and repairs of these modules may not have been carried out in accordance with approved Rolls-Royce procedures.

Pieter van Dijk
Delegate of the Civil Aviation Safety Authority

13 March 2020