75-13-04 PRATT & WHITNEY AIRCRAFT: Amendment 39-2244. Applies to all Pratt & Whitney Aircraft TF33-P-7 and TF33-P-7A turbofan engines containing thirteenth stage compressor disk, P/N 657913, fourteenth stage compressor disk, P/N 657914, fifteenth stage compressor disk, P/N 657915, and sixteenth stage compressor disk, P/N 657916.
To ensure adequate life limit margin, remove from service thirteenth, fourteenth, fifteenth, and sixteenth stage compressor disks prior to exceeding the revised life limit listed below.
Disk Part Number
Previous Life Limit (Cycles)
Revised Life Limit (Cycles)
657913
15,000
8,500
657914
15,000
8,500
657915
15,000
8,500
657916
15,000
8,500
This amendment becomes effective July 3, 1975.