# AD 69-23-06: Fuel Pumps

- Type: Airworthiness directive
- Status: Current
- Products: Pratt & Whitney Canada PT6A-20, PT6A-27, PT6A-28, PT6A-6, PT6A-6A, PT6A-6B and PT6B-9
- Effective: November 15, 1969
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Amendment: 39-874
- Registered aircraft: 2,552 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/41EB20B589F2FE558625682C005604F2.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/69-23-06

## The airworthiness directive

69-23-06 UNITED AIRCRAFT OF CANADA, LIMITED: Amdt. 39-874. Applies to PT6 model series engines equipped with Pesco Model 024-800 fuel pumps as follows:

PT6A-6, -6A, -6B, PT6B-9 all engines PT6A-20 prior to S/N PC-E22480 PT6A-27 prior to S/N PC-E40311 PT6A-28 prior to S/N PC-E50054 except 50051, 50052

Compliance within 50 hours after the effective date of this Airworthiness Directive unless already accomplished.

To prevent disengagement of the fuel pump input coupling from the engine gearbox, remove retaining ring, Pesco P/N 99-4660 and install new snap ring Pesco P/N 99-4906. United Aircraft of Canada Ltd. Service Bulletin No. 174 pertains to this subject.

This amendment is effective November 15, 1969.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E4EA](https://openairdocs.org/tcds/E4EA): Pratt & Whitney Canada Corp.; names 5 of 54 models: PT6A-6B, PT6A-6, PT6B-9, PT6A-6A, PT6A-20

## 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: 2,552 (0 by airframe model, 2,552 by engine model)
- Makers: Beech 578, Cessna 449, Air Tractor 407, Raytheon 280, Piper 237, Pilatus 168, Socata 110, Dehavilland 96, Ayres 46, Piaggio 23

Models with the most aircraft:

- [Pratt & Whitney PT6A series](https://openairdocs.org/engine/pratt-whitney-pt6a-series): 2,217 aircraft (engine model)
- [Pratt & Whitney Canada PT6A-6 series](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-6-series): 170 aircraft (engine model)
- [Pratt & Whitney PT6 series](https://openairdocs.org/engine/pratt-whitney-pt6-series): 43 aircraft (engine model)
- [Pratt & Whitney Canada PT6A-27 series](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-27-series): 30 aircraft (engine model)
- [Pratt & Whitney PT6A-27 series](https://openairdocs.org/engine/pratt-whitney-pt6a-27-series): 28 aircraft (engine model)
- [Pratt & Whitney PT6A-28 series](https://openairdocs.org/engine/pratt-whitney-pt6a-28-series): 25 aircraft (engine model)
- [Pratt & Whitney Canada PT6A-20](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-20): 21 aircraft (engine model)
- [Pratt & Whitney Canada PT6A-28 series](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-28-series): 12 aircraft (engine model)
- [Pratt & Whitney Canada PT6 series](https://openairdocs.org/engine/pratt-whitney-canada-pt6-series): 3 aircraft (engine model)
- [U/A Canada PT6A-20](https://openairdocs.org/engine/u-a-canada-pt6a-20): 2 aircraft (engine model)
- [U/A Canada PT6A-6](https://openairdocs.org/engine/u-a-canada-pt6a-6): 1 aircraft (engine model)

All 12 models: https://openairdocs.org/ad/69-23-06/models.md
Every aircraft: https://openairdocs.org/ad/69-23-06/aircraft.md

Its text cites no advisory circulars or STCs.

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