# AD 59-21-03: Compressor Blade

- Type: Airworthiness directive
- Status: Current
- Products: Rolls-Royce 501-D13 and 501-D13A
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- Registered aircraft: 9 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/12305221C13C913686256854006DDAF9.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/59-21-03

## The airworthiness directive

59-21-03 ALLISON: Applies to Models 501-D13 and -D13A Engines.

Compliance required not later than November 15, 1959.

Ten cases of compressor blade retention failures have occurred in service including one case that resulted in serious bulging and separation on the split line of the compressor case and flash fire inside the cowling during ground running. To preclude the possibility of serious engine damage resulting from failure of first stage compressor blade retention one of the following modifications must be incorporated not later than November 15, 1959.

Install first stage compressor wheel assembly P/N 67 92821 or first stage compressor wheel assembly P/N 67 93351 or compressor rotor assembly P/N 67 92332. Allison Commercial Engine Bulletins Numbers 61 or 80 cover the first two modifications while the last is a new design.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E-282](https://openairdocs.org/tcds/E-282): Rolls-Royce Corporation; names 2 of 9 models: 501-D13, 501-D13A

## 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: 9 (0 by airframe model, 9 by engine model)
- Makers: Convair 6, Lockheed 3

Models with the most aircraft:

- [Allison 501-D13 series](https://openairdocs.org/engine/allison-501-d13-series): 9 aircraft (engine model)

All 1 models: https://openairdocs.org/ad/59-21-03/models.md
Every aircraft: https://openairdocs.org/ad/59-21-03/aircraft.md

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.