# AD 77-07-11: Fourth Stage Turbine Stator And Rotor

- Type: Airworthiness directive
- Status: Current
- Products: Pratt & Whitney Division JT8D-9 and JT8D-9A
- Effective: April 15, 1977
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-2872
- Registered aircraft: 97 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/53E43160CA5AF3858625685E0071D0E2.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/77-07-11

## The airworthiness directive

77-07-11 PRATT & WHITNEY AIRCRAFT: Amendment 39-2872. Applies to Pratt & Whitney Aircraft JT8D-9 and -9A turbofan engine models with the following serial numbers:

665158, 665161, 665165, 665169, 665179, 665180, 665181, 665194, 665197, 665201, 665202, 665207, 665208, 665213, 665215, 665216, 665218, 665220, 665221, 665231, 665244, 665246, 665252, 665254, 665258, 665279, 665282, 665283, 665285, 665288, 665303, 665304, 665311, 665312, 665315, 665317, 665318, 665321, 665323, 665328, 665329, 665331, 665335, 665336, 665338, 665340, 665345, 665358, 665364, 665370, 665375, 665377, 665380, 665381, 665384, 665386, 665388, 665389, 665392, 665393, 665402, 665406, 665408, 665410, 665416, 665417, 665418, 665421, 665429, 665434, 665436, 665437, 665438, 665440, 665441, 665442, 665443, 665448, 665455, 665459, 665463, 665467, 665468, 665481, 665489, 665519, 665520, 665521, 665528, 665529, 665531, 665532, 665533, 665536, 665538, 665547, 665548, 665549, 665551, 665552, 665560, 665562, 665563, 665630, 665631, 665636, 665637, 665659, 665661, 665662, 665663, 665664, 665665, 665666, 665667, 665668, 665681, 665682, 665683, 666789, 666803, 666807, 666810, 666838, 666882, 666884, 666892, 666901, 666913, 674162, 674344, 674399, 674401, 674250, 674262, 674266, 674314, 674325, 674333, 674335, 674354, 674355, 674359, 674361, 674374, 674376, 674379, 674380, 674384, 674391, 674400, 674404, 674422, 674482, 674487, 674489

Compliance required as indicated prior to the accumulation of 6000 hours time in service after February 20, 1975, unless already accomplished.

To preclude interference between the fourth stage turbine stator and rotor as a result of possible intermixing of different material stators, inspect for and replace all fourth stage stator vanes not FAA approved for that engine model.

This supersedes Amendment 39-1835, AD 74-10-12, as amended by Amendment 39-2088.

This Amendment becomes effective April 15, 1977.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E2EA](https://openairdocs.org/tcds/E2EA): Pratt & Whitney; names 2 of 16 models: JT8D-9, JT8D-9A

## 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: 97 (0 by airframe model, 97 by engine model)
- Makers: Mcdonnell Douglas 79, Boeing 16, Douglas 2

Models with the most aircraft:

- [Pratt & Whitney JT8D series](https://openairdocs.org/engine/pratt-whitney-jt8d-series): 82 aircraft (engine model)
- [Pratt & Whitney JT8D-9 series](https://openairdocs.org/engine/pratt-whitney-jt8d-9-series): 9 aircraft (engine model)
- [Pratt & Whitney JT8D-9A](https://openairdocs.org/engine/pratt-whitney-jt8d-9a): 5 aircraft (engine model)
- [Pratt & Whitney JT8D-9](https://openairdocs.org/engine/pratt-whitney-jt8d-9): 1 aircraft (engine model)

All 4 models: https://openairdocs.org/ad/77-07-11/models.md
Every aircraft: https://openairdocs.org/ad/77-07-11/aircraft.md

Its text cites no advisory circulars or STCs.

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