# AD 80-19-03: Fifth Stage Compressor Disks

- Type: Airworthiness directive
- Status: Current
- Products: Pratt & Whitney Division JT3D-1-MC7
- Effective: October 7, 1980
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-3911
- Registered aircraft: 2 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/10F3B90C4F9541778625685F006FED2D.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/80-19-03

## The airworthiness directive

80-19-03 PRATT & WHITNEY AIRCRAFT: Amendment 39-3911. Applies to all Pratt & Whitney Aircraft JT3D-1-MC7 turbofan engine models.

Compliance required not later than December 31, 1980.

To preclude high cycle fatigue cracking of fifth stage compressor disks which could result in disk fracture, retire from service all fifth stage compressor disks, P/N 426505, and replace with either disk P/N 697105 or P/N 749605.

Upon submission of substantiating data, through an FAA Aviation Safety Inspector, the Chief, Engineering and Manufacturing Branch, New England Region, may adjust the compliance date.

A historical file on this AD is maintained in full by the FAA at its headquarters in Washington, D.C., and at the New England Region.

This amendment becomes effective October 7, 1980.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1E8](https://openairdocs.org/tcds/1E8): Pratt & Whitney Division; names 1 of 11 models: JT3D-1-MC7

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 2 (0 by airframe model, 2 by engine model)
- Makers: Mcdonnell Douglas 2

Models with the most aircraft:

- [Pratt & Whitney JT3D series](https://openairdocs.org/engine/pratt-whitney-jt3d-series): 2 aircraft (engine model)

All 1 models: https://openairdocs.org/ad/80-19-03/models.md
Every aircraft: https://openairdocs.org/ad/80-19-03/aircraft.md

Its text cites no advisory circulars or STCs.

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