AD 48-22-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | Double Wasp CA15 | PRATT & WHITNEY Model Double Wasp Engines |
| engine | Pratt & Whitney Division | Double Wasp CA17 | PRATT & WHITNEY Model Double Wasp Engines |
| engine | Pratt & Whitney Division | Double Wasp CA18 | PRATT & WHITNEY Model Double Wasp Engines |
| engine | Pratt & Whitney Division | Double Wasp CA19 | PRATT & WHITNEY Model Double Wasp Engines |
| engine | Pratt & Whitney Division | Double Wasp CA3 | PRATT & WHITNEY Model Double Wasp Engines |
| engine | Pratt & Whitney Division | Double Wasp CA5 | PRATT & WHITNEY Model Double Wasp Engines |
| engine | Pratt & Whitney Division | Double Wasp CB16 | PRATT & WHITNEY Model Double Wasp Engines |
| engine | Pratt & Whitney Division | Double Wasp CB17 | PRATT & WHITNEY Model Double Wasp Engines |
| engine | Pratt & Whitney Division | Double Wasp CB3 | PRATT & WHITNEY Model Double Wasp Engines |
| engine | Pratt & Whitney Division | Double Wasp CB4 | PRATT & WHITNEY Model Double Wasp Engines |
Unsafe Condition
Water-alcohol injection systems may allow water flow into the carburetor, leading to pump failure from dry running or inadvertent water flow during operation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Disconnect water feed line and install 1/2-inch pipe plug in regulator entrance. Disconnect water vent line at regulator and install 1/4-inch pipe plug. Drain water tank, disconnect pump, and secure lines with tape or remove and store until reactivation. Modifications with specific valves must be made to reactive the system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
prior to next flight
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Affected Aircraft
Martin 202, Convair 240, and Douglas DC-6 Aircraft powered with Pratt & Whitney Double Wasp engines equipped with water-alcohol injection system.
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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