AD/RB211/33 - High Speed Gearbox and Dedicated Generator - Modifications (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 CASR 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.

Rolls Royce Turbine Engines - RB211 Series

AD/RB211/33 High Speed Gearbox and Dedicated Generator - Modifications

10/2003 DM

Applicability: Rolls Royce RB211- 524G2, 524G2-T, 524G3, 524G3-T, 524H, 524H2, 524H-T and 524H2-T series engines installed on Boeing 747 and 767 aeroplanes, as detailed in Rolls Royce Service Bulletin (SB) RB.211-72-E037 dated 26 March 2003.

Requirement: 1. Modify the High Speed Gearbox Rear Housing and fittings in accordance with Rolls Royce SB RB.211-72-E037 dated 26 March 2003 on:

1. All RB211-524H-36 and 524H-T-36 series engines; and

b. All RB211 engines except 524H-36 and 524H-T-36 series engines.

2. As an alternative means of compliance with Requirement 1(a):

1. Carry out the actions required by Rolls Royce SB RB.211-73-D435 dated 6 July 2001; and

b. Carry out the actions required by Rolls Royce SB RB.211-72-E037 dated 26 March 2003

Note 1: Requirement 2 offers an acceptable means of compliance (AMOC) by introducing a software modification in accordance with Rolls Royce SB RB.211-73- D435 to prevent uncommanded acceleration etc. in the event of erratic HP shaft signals. The incorporation of this software modification delays the need to comply with SB RB211-72-E037 and RB.211-73-C501 (a requirement contained in the body of SB RB211-72-E037 and Requirement 3 of this AD) until 31 December 2006.