AD 74-22-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-23 | Airworthiness Directives; Piper Models PA-23, PA-23-160, PA-23-235, PA-23-250 and PA-E23-250 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-23-160 | Airworthiness Directives; Piper Models PA-23, PA-23-160, PA-23-235, PA-23-250 and PA-E23-250 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-23-235 | Airworthiness Directives; Piper Models PA-23, PA-23-160, PA-23-235, PA-23-250 and PA-E23-250 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-23-250 (Navy UO-1) | Airworthiness Directives; Piper Models PA-23, PA-23-160, PA-23-235, PA-23-250 and PA-E23-250 Airplanes |
| aircraft | Piper Aircraft Inc. | PA-E23-250 | Airworthiness Directives; Piper Models PA-23, PA-23-160, PA-23-235, PA-23-250 and PA-E23-250 Airplanes |
Unsafe Condition
The heater fuel valve stem and cap nut may back off, spilling fuel.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the stem and cap nut for proper safetying and secureness. Disassemble and inspect for damage if not secure or properly safetied; replace damaged parts and install a cap nut or assembly drilled for MS20995C41 safety wire or equivalent. Re-install valve assembly, safety wire the cap nut, and pressure check the fuel system.
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Compliance Time
within 100 hours or ninety days after the effective date of this AD, whichever occurs first
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Affected Aircraft
Piper Models PA-23, PA-23-160 (Serial Nos. 23-1 to 23-2046), PA-23-235, PA-23-250, and PA-E23-250 (Serial Nos. 27-1 to 27-3943 except 27-3837)
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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