AD 56-06-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | Double Wasp CA15 | PRATT & WHITNEY All Models Engines |
| engine | Pratt & Whitney Division | Double Wasp CA17 | PRATT & WHITNEY All Models Engines |
| engine | Pratt & Whitney Division | Double Wasp CA18 | PRATT & WHITNEY All Models Engines |
| engine | Pratt & Whitney Division | Double Wasp CA19 | PRATT & WHITNEY All Models Engines |
| engine | Pratt & Whitney Division | Double Wasp CA3 | PRATT & WHITNEY All Models Engines |
| engine | Pratt & Whitney Division | Double Wasp CA5 | PRATT & WHITNEY All Models Engines |
| engine | Pratt & Whitney Division | Double Wasp CB16 | PRATT & WHITNEY All Models Engines |
| engine | Pratt & Whitney Division | Double Wasp CB17 | PRATT & WHITNEY All Models Engines |
| engine | Pratt & Whitney Division | Double Wasp CB3 | PRATT & WHITNEY All Models Engines |
| engine | Pratt & Whitney Division | Double Wasp CB4 | PRATT & WHITNEY All Models Engines |
Unsafe Condition
Cylinder flange attaching stud failures leading to engine fire due to cylinder failure, or loosening of attaching nuts causing clearance between nut and cylinder flange, resulting in severe overstress on adjacent studs.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace failed or loose studs and adjacent studs as specified. Scrap or rebarrel cylinder and replace all studs if more than two adjacent studs fail or nuts loosen. Inspect and torque nuts securely during installation, magnaflux for cracks, and lap flange if distorted within limits.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as indicated.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Division engines: Double Wasp CA15, CA17, CA18, CA19, CA3, and other models listed in the AD.
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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