AD 56-24-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Kelowna Flightcraft R & D Ltd. | 240 Series | CONVAIR Models 240, 340 and 440 Series Aircraft |
| aircraft | Kelowna Flightcraft R & D Ltd. | 340 | CONVAIR Models 240, 340 and 440 Series Aircraft |
| aircraft | Kelowna Flightcraft R & D Ltd. | 440 | CONVAIR Models 240, 340 and 440 Series Aircraft |
Unsafe Condition
Engine cylinder failures, specifically involving stud failures or flange failures of the No. 8 cylinder, can dislodge the cylinder and sever the feathering line, preventing propeller feathering and creating an additional fire hazard from oil being pumped onto the engine.
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Required Actions
Reroute the propeller feathering line between cylinders either by following Convair Service Bulletins (240-479, 340-205, 440-23) or route the line between front row cylinders, allowing adequate flexibility if passing over a rear row cylinder.
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Compliance Time
by September 1, 1957
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Affected Aircraft
CONVAIR Models 240, 340, and 440 Series Aircraft
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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