# AD 61-05-05: R-1300-1A Engines

- Type: Airworthiness directive
- Status: Current
- Products: Thompson Aircraft Sales T-28A
- Effective: March 4, 1961
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Registered aircraft: 2 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7BA39CF56424936E86256A4900533F94.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/61-05-05

## The airworthiness directive

61-05-05 NORTH AMERICAN: Amdt. 260 Part 507 Federal Register March 4, 1961. Applies to All T-28A Aircraft Certified In The Restricted Category.

Compliance required as indicated.

  (a) The R-1300-1A engines which have been overhauled must have Change 53 of T.O. 2R-R1300-5 incorporated upon the accumulation of 860 hours since last overhaul. R-1300-1A engines which have never been overhauled must have Change 53 of T.O. 2R-R1300-5 incorporated upon the accumulation of 860 hours total time in service since new. The modified engines will be designated as R-1300-1B engines by stamping the letter "B" on the engine nameplate.

  (b) The engine-driven fuel pump, AN-4100, and fuel booster pump must be overhauled every 1,200 hours' time in service.

  (c) The engine-driven hydraulic pump, AS-6201-1, must be overhauled every 860 hours' time in service.

  (d) (1) The A-422-E1 or -E2 propeller, regardless of serial number, must be disassembled, inspected, and reworked in accordance with T.O. 3H3-3-512 at 300 hours' time in service.

  (2) The A-422-E1 or -E2 propeller must be removed from service after 2,100 hours' time in service.

  (e) Conduct an inspection of all cylinders in accordance with paragraph 2 of T.O. 1T-28A-531 at the following intervals:

  (1) Every 30 hours' time in service.

  (2) During any intermediate engine inspection at which oil leaks, carbon smudges, etc., are detected.

(Cylinder assembly P/N 430622 Change T and later changes have shotpeened barrels and do not require the above cylinder barrel inspection. The cylinder assembly number is stamped on the flat of the cylinder identification pad.)

This supersedes AD 58-24-03.

This directive effective March 4, 1961.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS AR-30](https://openairdocs.org/tcds/AR-30): Thompson Aircraft Sales; names 1 of 1 models: T-28A

## 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 (2 by airframe model, 0 by engine model)
- Makers: North American-Martin 1, North American/Walker 1

Models with the most aircraft:

- [North American-Martin T-28A](https://openairdocs.org/model/north-american-martin-t-28a): 1 aircraft (airframe model)
- [North American/Walker T-28A](https://openairdocs.org/model/north-american-walker-t-28a): 1 aircraft (airframe model)

All 2 models: https://openairdocs.org/ad/61-05-05/models.md
Every aircraft: https://openairdocs.org/ad/61-05-05/aircraft.md

Its text cites no advisory circulars or STCs.

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