Subject: Rolls Royce Germany Turbine
Engines - BR700 Series
AD: AD/BR700/6 Independent Overspeed Protection 8/2005
TX
Applicability: BR700-715A1-30, BR700-715B1-30 and BR700-715C1-30
engines, all serial
numbers. Requirement: 1. If not previously accomplished,
inspect all affected engines to determine if independent overspeed
protection (IOP) units with part number (P/N) 112E9321G2 and serial
numbers LHBR0371through to LHBR0389 inclusive are installed in
accordance with Rolls-Royce Deutschland Alert Service Bulletin
(ASB) SB-BR700-73-A900371 dated 17 June 2005.
2. If two affected IOP units are installed in one aircraft, replace
at least one of the suspect IOP units in accordance with ASB
SB-BR700-73-A900371.
3. Replace all affected IOP units in accordance with ASB
SB-BR700-73-A900371.
Note: LBA Germany AD D-2005-221 refers. Compliance: For Requirement
1 - Within the next 10 flight cycles after the effective date of
this Directive.
For Requirement 2 - Before further flight after the Requirement 1
inspection.
For Requirement 3 - No later than 31 July 2005.
Effective Date: This Airworthiness Directive becomes effective on
22 June 2005.
Background: The manufacturer has been informed by the supplier of
the IOP unit that incorrect capacitors have been installed in some
IOP units with P/N 112E9321G2. The incorrect capacitor in the IOP
unit can lead to an inadvertent IOP command and consequently an
in-flight-shutdown. The actions specified by this Airworthiness
Directive are intended to prevent the mentioned malfunction of the
IOP unit which could lead to an in-flight-shutdown.
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