# AD 75-13-04: Compressor Disks

- Type: Airworthiness directive
- Status: Current
- Products: Pratt & Whitney Division TF33-P-7 and TF33-P-7A
- Effective: July 3, 1975
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-2244
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/007DE4A43F5E6B348625685B00713181.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/75-13-04

## The airworthiness directive

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.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E3EA](https://openairdocs.org/tcds/E3EA): Pratt & Whitney Division; names 2 of 3 models: TF33-P-7, TF33-P-7A

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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