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

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.

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:

1. 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.