AD/RB211/41 Engine Thrust Reverser Unit (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 39.001(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/RB211/41 | Engine - Thrust Reverser Unit | 7/2009 |
Applicability: | RB211-524D4-19, RB211-524D4-B-19, RB211-524D4-39, RB211-524D4-B-39, RB211-524D4X-B-19, RB211-524H-36, RB211-524H2-19, RB211-524HT-36, RB211-524H2-T-19, RB211-524G2-19, RB211-524G3-19, RB211-524G2-T-19 and RB211-524G3-T-19 engines, all serial numbers, if equipped with a Thrust Reverser having a part number as identified in Rolls-Royce RB211 Propulsion Systems Non-Modification Service Bulletin (NMSB) No.78-AG084. Note 1: These engines are known to be installed, but not limited to Boeing 747 and Boeing 767 series aircraft. |
Requirement: | 1. If a Thrust Reverser Unit (TRU) has previously had Engine Manual repair 2. If a TRU has previously had Engine Manual repair No. FRS4976 or Engine Manual repair No. FRS6669 embodied and it is not known whether this was performed jointly with Engine Manual repair No. FRS5887, carry out the actions specified in Section 3. Accomplishment Instructions of Rolls-Royce NMSB 3. If a TRU has previously had only Engine Manual repair No. FRS5887 embodied, carry out the actions specified in Section 3. Accomplishment Instructions of Rolls-Royce NMSB No. 78-AG084. The use of later approved revisions of this document is acceptable for compliance with the requirements of this AD. Note 2: EASA AD 2009-0089 dated 16 April 2009 refers. |
Compliance: | For Requirements 1 and 2 - Before 31st December 2009. For Requirement 3 - Before 31st December 2012. |
| This Airworthiness Directive becomes effective on 2 July 2009. |
Background: | An investigation into the loss of a TRU during landing has revealed that this incident was preceded by the detachment of the TRUs fixed structure front ring rivet lines on the rear flange. It was concluded that the loss of rivet lines was directly associated with a previous translating cowl gearbox stubshaft fracture and the subsequent repair of the fixed structure to Engine Manual repair No. FRS5887. This repair instructs the replacement of the damaged section of the structure but does not require the rivets adjacent to the repair to be replaced although latest analysis has shown that the rivets may have weakened as a result a translating cowl gearbox stubshaft failure. Loss of a TRU during landing may release a significant amount of debris, adversely affecting the safety of flight operations. Thus, the loss of a TRU constitutes a potentially unsafe condition. This Airworthiness Directive instructs the replacement of potentially yielded rivets from TRUs in service in order to prevent a further TRU loss. |
James Coyne
Delegate of the Civil Aviation Safety Authority
22 May 2009
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