Commonwealth legislation

AD/CFM56/22 - EGT Harnesses and EGT Couplings

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Commonwealth

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legislative instrument

Plain English Summary

6/10 complexity

This Airworthiness Directive requires operators of CFM56-5/5B engines with specified EGT harness or coupling part and serial numbers to either replace those parts or put them under continuous EGT trend monitoring (via SAGE or equivalent). If monitoring shows a steady 30°C downward EGT reading without matching changes in N1, N2 or fuel flow, the parts must be replaced if there is sufficient EGT margin. Operators pay for replacements and monitoring; the AD is the CASA delegate’s instruction to correct a declared unsafe condition.

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AIRWORTHINESS DIRECTIVE

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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 CAR 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.

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CFM International Turbine Engines - CFM56 Series

AD/CFM56/22 EGT Harnesses and EGT Coupli

AD/CFM56/22 EGT Harnesses and EGT Couplings 3/2003

Applicability: CFM56-5 and -5B series turbofan engines that have an exhaust gas temperature (EGT) upper harness part number (P/N) CA170-00, with a serial number (S/N) of YC021674 or lower, or an EGT lower harness P/N CA171-00, with a S/N of YC026641 or lower, or an EGT coupling P/N CA172-02 with a S/N of YC166736 or lower.

Note 1: These engines are installed on, but not limited to, Airbus Industrie A318, A319, A320 and A321 aeroplanes.

Note 2: Harnesses or couplings having a serial number that is followed by the letter "W" are not affected by this Directive.

Requirement: 1. If EGT harnesses and EGT couplings have accumulated less than 3,000 engine flight hours since installation, carry out either of the following actions:

Replace affected EGT harnesses and EGT couplings, not being trend monitored, with serviceable parts in accordance with CFM International Service Bulletins CFM56-5 S/B 77-0020 or CFM56-5B S/B 77-0008, both dated 4 March 2002, as applicable, or

b. Review the smooth data EGT trend via the System for Analysis of Gas Turbine Engines (SAGE), or equivalent, since the affected components were first installed on the current engine. This trend monitoring must continue for the affected EGT harnesses and couplings to ensure that the system does not show a minimum of 30oC downward (i.e. cooler) indication, or more, without a corresponding change in other associated engine parameters such as N1 (LPT rotor speed), N2 (HPT rotor speed), and fuel flow.

2. If the Requirement 1b. SAGE monitoring shows a minimum of 30oC downward indication, or more, without a corresponding change in other associated engine parameters such as N1, N2 and fuel flow, provided that there is sufficient actual EGT margin to do so, replace the EGT harnesses and couplings.

Note 3: FAA AD 2003-02-04 Amdt 39-13020 and DGAC AD 2003-001(B) refer.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE

AIRWORTHINESS DIRECTIVE

CFM International Turbine Engines - CFM56 Series

AD/CFM56/22 EGT Harnesses and EGT Coupli AD/CFM56/22 EGT Harnesses and EGT Couplings 3/2003

AD/CFM56/22 EGT Harnesses and EGT Couplings 3/2003

Note 1: These engines are installed on, but not limited to, Airbus Industrie A318, A319, A320 and A321 aeroplanes.

Note 2: Harnesses or couplings having a serial number that is followed by the letter "W" are not affected by this Directive.

Requirement: 1. If EGT harnesses and EGT couplings have accumulated less than 3,000 engine flight hours since installation, carry out either of the following actions:

Replace affected EGT harnesses and EGT couplings, not being trend monitored, with serviceable parts in accordance with CFM International Service Bulletins CFM56-5 S/B 77-0020 or CFM56-5B S/B 77-0008, both dated 4 March 2002, as applicable, or

b. Review the smooth data EGT trend via the System for Analysis of Gas Turbine Engines (SAGE), or equivalent, since the affected components were first installed on the current engine. This trend monitoring must continue for the affected EGT harnesses and couplings to ensure that the system does not show a minimum of 30oC downward (i.e. cooler) indication, or more, without a corresponding change in other associated engine parameters such as N1 (LPT rotor speed), N2 (HPT rotor speed), and fuel flow.