AD 51-28-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Ryan Aeronautical Company | ST-3KR | Airworthiness Directives; Ryan Model ST-3KR (Military PT-22) Aircraft. |
Unsafe Condition
Failure to observe placard procedures for fuel selector valve position during takeoff and landing can result in fatal accidents due to insufficient fuel supply.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a placard or revise the existing placard to read: 'Always take off and land with fuel feeding from RESERVE'.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
by February 1, 1952, or next 100-hour inspection, whichever is first
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Affected Aircraft
Ryan Aeronautical Company Model ST-3KR (Military PT-22) Aircraft, all serial numbers
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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