Commonwealth legislation

AD/CFM56/10 Amdt 1 - Stage 1-2 Spool HPC and No.3 Bearing Aft Stationary Air/Oil Seal

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Commonwealth

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legislative instrument

Plain English Summary

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This Airworthiness Directive obliges operators of CFM56-2 and CFM56-3/-3B/-3C engines to remove and replace specified HPC stage 1‑2 spools and certain No.3 bearing aft stationary air/oil seals (identified by part and serial numbers) and to install a retention bushing on listed engines, following the manufacturer's service bulletins. The stated aim is to prevent seal separations and rubbing that can damage the compressor spool; compliance is required at the next exposure or by 1 May 1998. The amendment corrects typographical errors and does not change compliance obligations.

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Direct links to the current provisions in AD/CFM56/10 Amdt 1 - Stage 1-2 Spool HPC and No.3 Bearing Aft Stationary Air/Oil Seal.

AD/CFM56/10 Amdt 1 - Stage 1-2 Spool HPC and No.3 Bearing Aft Stationary Air/Oil Seal

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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CFM International Turbine Engines - CFM56 Series

AD/CFM56/10

Amdt 1

Stage 1-2 Spool HPC and No.3 Bearing Aft Stationary Air/Oil Seal

10/98

Applicability: CFM International (CFMI) CFM56-2 and CFM56-3, -3B and -3C model turbofan engines.

Requirement: 1. CFM 56-2: Remove from service HPC stage 1-2 spool, part number 9992M60G07 having rubbing marks and with serial numbers as listed in manufacturers' Service Bulletin CFM56-2 No. 72-825, dated 23 January 1998 in accordance with the provisions of Service Bulletin CFM56-2, 72-825, and replace with a serviceable part.

2. CFM56-3, -3B, -3C: Remove from service HPC stage 1-2 spool part number 1589M66G02 with serial numbers listed in Service Bulletin CFM56-3/-3B/-3C 72- 856 dated 23 January 1998, in accordance with the provisions of Service Bulletin CFM56-3/3B/3C 72-856, and replace with a serviceable part.

3. CFM56-3,-3B, -3C: Engines with serial numbers 856692, 856709, 856713,

856799, 856673, 856691, 856694, 856696, 856697, 856746, 856780, 857669,

857685, 857686, 857704 and 859115 carry out the following actions:

Remove from service the No. 3 bearing aft stationary oil seal part number 1663M91G03 and replace with a serviceable part, and

b. Install a No.3 bearing aft air/oil serial retention bushing in accordance with Service Bulletin CFM56-3/3B/3C No. 72-855 dated 23 June 1997.

Note: For the purposes of this Airworthiness Directive, the following definitions apply:

(1) A serviceable spool is defined as a HPC1-2 spool without a rub or scratch indication.

(2) A serviceable seal is defined as a new No. 3 bearing aft stationary air/oil seal part number 1663M91G03 without one of the following serial numbers:

CTD81631, CTD81907, CTD81908, CTD81998, CTD82004, CTD82132, CTD82208, CTD82210, CTD82212, CTD82213, CTD82271, CTD82295, CTD82297, CTD82298, CTD82300, CTD82304, CTD82457, CTD82759, CTD82766, CTD82767, CTD82788, CTD82817, CTD82822, CTD82854, CTD82855, CTD82856, CTD82857, CTD82859, CTD82962, CTD83232, CTD83474, CTD83837, CTD83839, CTD84100, CTD84138, CTD84140, CTD84141, CTD84143, CTD84144, CTD84145, CTD84148, CTD84203, CTD84206, CTD84207, CTD84258, CTD84262, CTD84360, CTD84363, CTD84604, CTD84712, CTD84741, CTD85147, CTD85148, CTD85149, CTD85161, CTD85162, CTD85166, CTD85168, CTD85169, CTD85170, CTD85172, CTD85348, CTD85349, CTD85351, CTD85352, CTD85353, CTD85354, CTD85355.

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Compliance: 1. At the next exposure of the spool after the effective date of this directive, but prior to accumulating 2000 cycles since the last shop visit associated with the rub event.

2. As per 1 above.

3. Prior to 1 May 1998.

Note: DGAC AD 98-080(B)R1 dated 17 June 1998 refers.

This amendment does not effect the compliance requirements of the initial issue. This amendment becomes effective on 10 September 1998.

Background: Several separations of No. 3 bearing aft stationary air/oil seal have been experienced in service, resulting in rubbing on the disk of high pressure compressor spool stage 1-

To prevent the effects due to seal separation and rubbing, this directive mandates the removal and replacement of certain spools and seals. This revision is to correct some typing errors in Requirement paragraph 3b, note (2).

The original issue of this airworthiness directive became effective on 1 April 1998.

Source text

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

1 AD/CFM56/10 Amdt 1 - Stage 1-2 Spool HPC and No.3 Bearing Aft Stationary Air/Oil Seal

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

CFM International Turbine Engines - CFM56 Series

AD/CFM56/10

Amdt 1

Stage 1-2 Spool HPC and No.3 Bearing Aft Stationary Air/Oil Seal

10/98

Applicability: CFM International (CFMI) CFM56-2 and CFM56-3, -3B and -3C model turbofan engines.

2. CFM56-3, -3B, -3C: Remove from service HPC stage 1-2 spool part number 1589M66G02 with serial numbers listed in Service Bulletin CFM56-3/-3B/-3C 72- 856 dated 23 January 1998, in accordance with the provisions of Service Bulletin CFM56-3/3B/3C 72-856, and replace with a serviceable part.

3. CFM56-3,-3B, -3C: Engines with serial numbers 856692, 856709, 856713,

856799, 856673, 856691, 856694, 856696, 856697, 856746, 856780, 857669,

857685, 857686, 857704 and 859115 carry out the following actions:

Remove from service the No. 3 bearing aft stationary oil seal part number 1663M91G03 and replace with a serviceable part, and

b. Install a No.3 bearing aft air/oil serial retention bushing in accordance with Service Bulletin CFM56-3/3B/3C No. 72-855 dated 23 June 1997.

Note: For the purposes of this Airworthiness Directive, the following definitions apply:

(1) A serviceable spool is defined as a HPC1-2 spool without a rub or scratch indication.

(2) A serviceable seal is defined as a new No. 3 bearing aft stationary air/oil seal part number 1663M91G03 without one of the following serial numbers: