AD 54-21-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | AC | Diaphragm Type Fuel Pumps | Airworthiness Directives; AC DIAPHRAGM TYPE FUEL PUMPS: Applies to All Aircraft Powered by Continental, Aircooled or Lycoming Engines |
Unsafe Condition
Severe fuel leakage in flight caused by loosening of AC fuel pump surge chambers due to inadequate safetying of the sediment bowl and surge chamber.
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Required Actions
Inspect sediment bowl cap screw and surge chamber for adequate safetying. If not safetied, lockwiring or equivalent must be accomplished in accordance with good aircraft practice, such as per Lycoming Service Bulletin No. 174.
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Compliance Time
as soon as possible but not later than November 30, 1954
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Affected Aircraft
All aircraft powered by Continental, Aircooled, or Lycoming engines equipped with AC Diaphragm Type Fuel Pumps.
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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