Document ID: chunk:federal_register_of_legislation:F2005L01063:body:0:p2
Version: federal_register_of_legislation:F2005L01063
Segment Type: other
Provision Reference: 
Character Range: 3889–6337

GATH8GRR  GATH8K15  GATH94RK
   GATH7PRA  GATH86JG  GATH8GRT  GATH8K16  GATH94RN
   GATH7PRC  GATH86JH  GATH8GRW  GATH8K17  GATH94RP
   GATH7PRD  GATH86JJ  GATH8GT0  GATH8K18  GATH94RR
   GATH7PRE  GATH86JK  GATH8GT1  GATH8K19  GATH94RT
   GATH7PRF  GATH86JL  GATH8GT3  GATH8W7H  GATH96HF
   GATH7PRG  GATH86JM  GATH8GT5  GATH8W7J  GATH96HG
   GATH7PRH  GATH86JN  GATH8GT7  GATH8W7L  GATH96HK
   GATH7PRJ  GATH86JP  GATH8GT8  GATH8W7M  GATH96HL
   GATH7PRK  GATH86JR  GATH8HGF  GATH8W7N  GATH96HM

              GATH7PRL  GATH86JT  GATH8HGG  GATH8W7P  GATH96HN
              GATH7PRM  GATH86JW  GATH8HGH  GATH8W7R  GATH96HR
              GATH7PRN  GATH86K0  GATH8HGJ  GATH8W7T  GATH96HT
              GATH7PRP  GATH86K2  GATH8HGK  GATH8WD4  GATH96HW
              GATH7PRR  GATH86K3  GATH8HGL  GATH8WD5  GATH96J0

              Note 1:  These engines are installed on, but not limited to, Agusta S.p.A AS-61N, AS-61N1, Sikorsky S-61L, S-61N, S-61R, and S-61NM helicopters, and the following surplus military helicopters: Sikorsky S-61D and S-61V, Glacier CH-3E, Siller CH-3E and SH-3A, and Robinson Crane CH-3C, CH-3E, HH-3C, HH-3E, and Carson
              S-61L helicopters.
Requirement:     1. Replace the stage 1 compressor disk.

              Note 2:  GE Alert Service Bulletin (ASB) No. CT58 S/B 72-A0196, dated 24 July 2003, contains information on replacing the stage 1 compressor disk.

                 2. Do not install any stage 1 compressor disk, P/N 5001T20P01, that has a SN listed in Table 1 of this Directive and has 2,100 hours TSN or more, into any engine.

              Note 3:  FAA AD 2005-04-10 Amdt 39-13982 refers.
Compliance:      1. At or before reaching a reduced low-cycle fatigue (LCF) life limit of 2,100 hours time-since-new (TSN) or by 31 December, 2008, whichever occurs first.

                 2. After the effective date of this AD.
              This Airworthiness Directive becomes effective on 9 June 2005.
Background:   This Directive requires removing certain stage 1 compressor disks from service before reaching a reduced LCF life limit for those affected disks.  This Directive results from two reports of low blade tip clearances in the compressor.  The requirements of this Directive are to prevent LCF cracking and failure of the stage 1 compressor disk, an uncontained engine failure, and damage to the helicopter.

James Coyne
Delegate of the Civil Aviation Safety Authority

28 April 2005