AD 56-03-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | Double Wasp CA15 | PRATT & WHITNEY Models Double Wasp CA and CB, and Military R-2800-34, -52W, -57, -73, -77, -83, and -101 Series Engines |
| engine | Pratt & Whitney Division | Double Wasp CA17 | PRATT & WHITNEY Models Double Wasp CA and CB, and Military R-2800-34, -52W, -57, -73, -77, -83, and -101 Series Engines |
| engine | Pratt & Whitney Division | Double Wasp CA18 | PRATT & WHITNEY Models Double Wasp CA and CB, and Military R-2800-34, -52W, -57, -73, -77, -83, and -101 Series Engines |
| engine | Pratt & Whitney Division | Double Wasp CA19 | PRATT & WHITNEY Models Double Wasp CA and CB, and Military R-2800-34, -52W, -57, -73, -77, -83, and -101 Series Engines |
| engine | Pratt & Whitney Division | Double Wasp CA3 | PRATT & WHITNEY Models Double Wasp CA and CB, and Military R-2800-34, -52W, -57, -73, -77, -83, and -101 Series Engines |
| engine | Pratt & Whitney Division | Double Wasp CA5 | PRATT & WHITNEY Models Double Wasp CA and CB, and Military R-2800-34, -52W, -57, -73, -77, -83, and -101 Series Engines |
| engine | Pratt & Whitney Division | Double Wasp CB16 | PRATT & WHITNEY Models Double Wasp CA and CB, and Military R-2800-34, -52W, -57, -73, -77, -83, and -101 Series Engines |
| engine | Pratt & Whitney Division | Double Wasp CB17 | PRATT & WHITNEY Models Double Wasp CA and CB, and Military R-2800-34, -52W, -57, -73, -77, -83, and -101 Series Engines |
| engine | Pratt & Whitney Division | Double Wasp CB3 | PRATT & WHITNEY Models Double Wasp CA and CB, and Military R-2800-34, -52W, -57, -73, -77, -83, and -101 Series Engines |
| engine | Pratt & Whitney Division | Double Wasp CB4 | PRATT & WHITNEY Models Double Wasp CA and CB, and Military R-2800-34, -52W, -57, -73, -77, -83, and -101 Series Engines |
Unsafe Condition
Fuel leakage of the derichment valve cover of PR58 carburetors due to loosening, leading to engine fires.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect for fuel leakage during scheduled inspections requiring engine cowl opening (approximately 100-hour intervals). Retorque derichment valve cover screws to 20-30 inch-pounds if leakage occurs, but only once per diaphragm. Replace diaphragm during overhaul or replacement, ensuring lapped surfaces, dry assembly, and proper torque with retightening after 20 minutes. Install four locating screws with shank dowels to eliminate lateral movement allows inspections at 200-hour intervals.
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 Double Wasp CA and CB, and Military R-2800-34, -52W, -57, -73, -77, -83, and -101 Series Engines using water injection.
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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