69-23-02 GENERAL ELECTRIC: Amdt. 39-870 as amended by Amendment 39-1086. Applies to models CT58-100-1, CT58-100-2, CT58-110-1, CT58-110-2, CT58-140-1, CT58-140-2, T58-GE-1 and T58-GE-5 turboshaft engines.
Compliance required as indicated.
To ensure adequate life limit margin for stage 2 compressor rotor disc shafts the life limits on these parts have been reduced below the figures currently approved.
Unless already accomplished, remove from service stage 2 compressor rotor disc shafts prior to reaching the revised life limit or in accordance with the removal schedule given below for those parts which are close to or exceed the limit on the effective date of this AD.
Part Numbers
Previous Life Limits
Revised Life Limits
Removal Schedule
Above 2,400 hrs.
5,800 Cycles
Hrs.
Cycles
Hrs.
Cycles
Remove within*
37E500153P101
2,500
8,000
2,500
6,000
100 Hrs.
200 Cycles
37E500213P101
2,500
8,000
2,500
6,000
100 Hrs
200 Cycles37E500213P103
2,500
8,000
2,500
6,000
100 Hrs.
200 Cycles
Above 2,950 Hrs.
5,900 Cycles
Remove within*
5008T79P01
10,000
40,000
3,000
6,000
50 Hrs.
100 Cycles
37E500153P101M
10,000
40,000
3,000
6,000
50 Hrs.
100 Cycles
Above 5,150 Hrs.
8,400 Cycles
Remove within*
5005T34P01
5,000
10,000
5,200
8,500
50 Hrs.
100 Cycles
5005T34P03
5,000
10,000
5,200
8,500
50 Hrs.
100 Cycles
5008T79P02
5,000
10,000
5,200
8,500
50 Hrs.
100 Cycles
*Time in service or cycles, whichever occurs first after the effective date of this AD.
For the purposes of this AD a cycle is considered as any engine operating sequence involving engine start, at least one acceleration to a power required for takeoff and shutdown.
Amendment 39-870 effective November 15, 1969.
This amendment 39-1086 is effective October 15, 1970.