Division CFM International Turbine Engines - CFM5 - AD/CFM56/32 - Engine Hydromechanical Unit - CFM International Turbine Engines - CFM56 Series

CFM International Turbine Engines - CFM56 Series

AD/CFM56/32	Engine Hydromechanical Unit	10/2009 TX

Applicability:	CFM International SA CFM56-5B engine models equipped with Hydromechanical units (HMU) VIN 8061-532 (P/N 1348M79P10), VIN 8061-535 (P/N 1348M79P13), VIN 8061-536 (P/N 1348M79P14), Serial Numbers (S/N) as identified within paragraph 1.A of CFM Service Bulletin CFM56-5B S/B 73-0238 Revision 1 and which have not been modified in accordance with CFM56-5A S/B 73-0208,CFM56-5B S/B 73-0239 or CFM56-5C S/B 73-0180.Note 1: These engines are known to be installed on, but not limited to Airbus A318, A319, A320 and A321 series aeroplanes.
Requirement:	1. Check engine records for any occurrence of ECAM (Electronic Centralized Aircraft Monitoring) “ENG X START FAULT- ENG X STALL” and/or “ENG X COMPRESSOR VANE” warnings since entry into service of the HMUs.Note 2: The letter “X” in ECAM warnings above is a placeholder for a numeral varying from 1 to 2.2. For engines which have displayed before the effective date of this AD, any of the ECAM warnings described in Requirement 1 of this AD, replace the affected HMU with a serviceable unit.3. For engines which have never displayed any of the ECAM warnings described in Requirement 1 of this AD:a. From the effective date of this AD, after any ECAM warnings described in Requirement 1 of this AD (during air or ground operations): Replace the affected HMU with a serviceable unit.b. If both engines on the same aeroplane are found with HMUs S/N as identified within paragraph 1.A of SB CFM56-5B S/B 73-0238 Revision 1, replace at least one HMU with a serviceable unit.Replacement of an HMU with a serviceable unit must be done in accordance with paragraph 3.C of CFM Service Bulletin CFM56-5B S/B 73-0238 Revision 1.

Applicability:

CFM International SA CFM56-5B engine models equipped with Hydromechanical units (HMU) VIN 8061-532 (P/N 1348M79P10), VIN 8061-535 (P/N 1348M79P13), VIN 8061-536 (P/N 1348M79P14), Serial Numbers (S/N) as identified within paragraph 1.A of CFM Service Bulletin CFM56-5B S/B 73-0238 Revision 1 and which have not been modified in accordance with CFM56-5A S/B 73-0208,CFM56-5B S/B 73-0239 or CFM56-5C S/B 73-0180.Note 1: These engines are known to be installed on, but not limited to Airbus A318, A319, A320 and A321 series aeroplanes.

Requirement:

1. Check engine records for any occurrence of ECAM (Electronic Centralized Aircraft Monitoring) “ENG X START FAULT- ENG X STALL” and/or “ENG X COMPRESSOR VANE” warnings since entry into service of the HMUs.Note 2: The letter “X” in ECAM warnings above is a placeholder for a numeral varying from 1 to 2.2. For engines which have displayed before the effective date of this AD, any of the ECAM warnings described in Requirement 1 of this AD, replace the affected HMU with a serviceable unit.3. For engines which have never displayed any of the ECAM warnings described in Requirement 1 of this AD:a. From the effective date of this AD, after any ECAM warnings described in Requirement 1 of this AD (during air or ground operations): Replace the affected HMU with a serviceable unit.b. If both engines on the same aeroplane are found with HMUs S/N as identified within paragraph 1.A of SB CFM56-5B S/B 73-0238 Revision 1, replace at least one HMU with a serviceable unit.Replacement of an HMU with a serviceable unit must be done in accordance with paragraph 3.C of CFM Service Bulletin CFM56-5B S/B 73-0238 Revision 1.

	Optional Terminating Action: Modification of both HMUs per one of the following SBs: CFM56-5A S/B 73-0208, CFM56-5B S/B 73-0239 or CFM56-5C S/B 73-0180 is an alternative corrective action for the requirements of this AD.The use of later approved revisions of these documents is acceptable for compliance with the requirements of this AD.Note 3: EASA AD 2009-0154-E dated 17 July 2009 refers.
Compliance:	For Requirement 1 - Within 24 hours after the effective date of this AD, unless previously accomplished.For Requirement 2 - Before further flight, unless previously accomplished.For Requirement 3.a. - Before further flight.For Requirement 3.b. - Within 30 days after the effective date of this AD.
	This Airworthiness Directive becomes effective on 27 July 2009.
Background:	In-flight compressor stall events have occurred on CFM56-5B turbofan engines. These events could have been caused by malfunction of the HMU Variable Stator Vanes (VSV)/Variable Bleed Valves (VBV) Scored Vanes and could lead to in-flight shutdown of the engine, which can result in a catastrophic effect at aircraft level if more than one engine is affected. This AD mandates the inspection and replacement of the affected HMUs.

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James Coyne
Delegate of the Civil Aviation Safety Authority

23 July 2009

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