# AD 60-21-01: Torquemeter Housing

- Type: Airworthiness directive
- Status: Current
- Products: Rolls-Royce 501-D13, 501-D13A, 501-D13D, 501-D13E and 501-D13H
- Effective: November 9, 1960
- Superseded by: Nothing supersedes this AD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/5CCF68A91FD21522862569B20071A48D.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/60-21-01

## The airworthiness directive

60-21-01 ALLISON: Amdt. 208 Part 507 Federal Register October 8, 1960. Applies to All Model 501-D13 Series Engines.

Compliance required at next overhaul of engine, power section or torquemeter, whichever occurs first, after the effective date of this AD.

Several cases of rubbing of the torquemeter housing by the torquemeter reference shaft have resulted in complete separation of the housing into two sections. To preclude such failures, a mid-bearing torquemeter assembly, P/N 6823900, identified by a 1/2-inch by 2 1/2-inch blue stripe on the forward bevel of the housing shall be installed. (Allison Commercial Engine Bulletin No. 72-113 covers the same subject.)

This directive effective November 9, 1960.

## 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 5 of 9 models: 501-D13, 501-D13E, 501-D13A, 501-D13H, 501-D13D

## 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/60-21-01/models.md
Every aircraft: https://openairdocs.org/ad/60-21-01/aircraft.md

Its text cites no advisory circulars or STCs.

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