AD 60-21-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce Corporation | 501-D13 | ALLISON Model 501-D13 Series Engines |
| engine | Rolls-Royce Corporation | 501-D13A | ALLISON Model 501-D13 Series Engines |
| engine | Rolls-Royce Corporation | 501-D13D | ALLISON Model 501-D13 Series Engines |
| engine | Rolls-Royce Corporation | 501-D13E | ALLISON Model 501-D13 Series Engines |
| engine | Rolls-Royce Corporation | 501-D13H | ALLISON Model 501-D13 Series Engines |
Unsafe Condition
Rubbing of the torquemeter housing by the torquemeter reference shaft can result in complete separation of the housing into two sections.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a mid-bearing torquemeter assembly, part number 6823900, identified by a 1/2-inch by 2 1/2-inch blue stripe on the forward bevel of the housing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
at next overhaul of engine, power section or torquemeter, whichever occurs first, after the effective date of this AD
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Affected Aircraft
Rolls-Royce Corporation Model 501-D13, 501-D13A, 501-D13D, 501-D13E, 501-D13H engines
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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