# AD 79-11-03: Automatic Fuel Control

- Type: Airworthiness directive
- Status: Current
- Products: Pratt & Whitney Canada PT6T-3 and PT6T-6
- Effective: May 31, 1979
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-3477
- Registered aircraft: 78 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C2C48ECABE554DFF8625682C0058FD45.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/79-11-03

## The airworthiness directive

79-11-03 PRATT & WHITNEY AIRCRAFT OF CANADA: Amendment 39-3477. Applies to Pratt & Whitney Aircraft of Canada, Limited PT6T-3 power sections prior to serial number CP-PS 61324 and PT6T-6 power sections prior to serial number CP-PS 72321.

Compliance required within the next 3000 hours in service after the effective date of this AD, unless already accomplished.

To preclude automatic fuel control contamination install the P3 air filter and associated parts in accordance with Paragraph 2, Accomplishment Instructions in Pratt & Whitney Aircraft of Canada, Ltd. Engine Service Bulletin No. 5124 thru Revision 3 or approved equivalent procedures and parts.

Equivalent procedures and parts must be approved by the Chief, Engineering and Manufacturing Branch of the Eastern Region of the Federal Aviation Administration (FAA).

This amendment is effective May 31, 1979.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E22EA](https://openairdocs.org/tcds/E22EA): Pratt & Whitney Canada Corp.; names 2 of 11 models: PT6T-6, PT6T-3

## 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: 78 (0 by airframe model, 78 by engine model)
- Makers: Bell 38, Sikorsky 25, Agusta 6, Pilatus 3, Aero Commander 1, Air Tractor 1, Beech 1, Cessna 1, Compagnie Daher 1, Textron 1

Models with the most aircraft:

- [Pratt & Whitney PT6 series](https://openairdocs.org/engine/pratt-whitney-pt6-series): 43 aircraft (engine model)
- [Pratt & Whitney Canada PT6T-3 series](https://openairdocs.org/engine/pratt-whitney-canada-pt6t-3-series): 17 aircraft (engine model)
- [Pratt & Whitney Canada PT6T-3](https://openairdocs.org/engine/pratt-whitney-canada-pt6t-3): 8 aircraft (engine model)
- [Pratt & Whitney Canada PT6T-6](https://openairdocs.org/engine/pratt-whitney-canada-pt6t-6): 5 aircraft (engine model)
- [Pratt & Whitney Canada PT6 series](https://openairdocs.org/engine/pratt-whitney-canada-pt6-series): 3 aircraft (engine model)
- [Pratt & Whitney PT6T-3](https://openairdocs.org/engine/pratt-whitney-pt6t-3): 1 aircraft (engine model)
- [Pratt & Whitney PT6T-6](https://openairdocs.org/engine/pratt-whitney-pt6t-6): 1 aircraft (engine model)

All 7 models: https://openairdocs.org/ad/79-11-03/models.md
Every aircraft: https://openairdocs.org/ad/79-11-03/aircraft.md

Its text cites no advisory circulars or STCs.

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