AD 72-01-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-18 | Airworthiness Directives; Piper Models PA-18, PA-18-105, PA-18-125, PA-18-135, PA-18A, PA-18A-125, and PA-18A-135 Aircraft |
| aircraft | Piper Aircraft Inc. | PA-18-105 (Special) | Airworthiness Directives; Piper Models PA-18, PA-18-105, PA-18-125, PA-18-135, PA-18A, PA-18A-125, and PA-18A-135 Aircraft |
| aircraft | Piper Aircraft Inc. | PA-18-125 (Army L-21A) | Airworthiness Directives; Piper Models PA-18, PA-18-105, PA-18-125, PA-18-135, PA-18A, PA-18A-125, and PA-18A-135 Aircraft |
| aircraft | Piper Aircraft Inc. | PA-18-135 | Airworthiness Directives; Piper Models PA-18, PA-18-105, PA-18-125, PA-18-135, PA-18A, PA-18A-125, and PA-18A-135 Aircraft |
| aircraft | Piper Aircraft Inc. | PA-18A | Airworthiness Directives; Piper Models PA-18, PA-18-105, PA-18-125, PA-18-135, PA-18A, PA-18A-125, and PA-18A-135 Aircraft |
| aircraft | Piper Aircraft Inc. | PA-18A-135 | Airworthiness Directives; Piper Models PA-18, PA-18-105, PA-18-125, PA-18-135, PA-18A, PA-18A-125, and PA-18A-135 Aircraft |
Unsafe Condition
Failure of the engine mount due to insufficient reinforcement at the lower right engine attachment points.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install engine mount P/N 12351-12 in accordance with Piper Drawing Number 12351, Mount Assembly-engine including Revision J dated January 16, 1968, or an equivalent approved by the FAA. Ensure the engine mount has tubes measuring 0.049 inches and two reinforcing plates number 14438 at the lower right attachment points.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 25 hours' time in service after the effective date of this AD
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Affected Aircraft
Piper Models PA-18, PA-18-105, PA-18-125, PA-18-135, PA-18A, PA-18A-125, and PA-18A-135 aircraft modified after May 14, 1968 with Supplemental Type Certificate SA 136 AL for Lycoming O-320 engine installation, excluding factory-delivered models with serial numbers 18-3771 and 18-3781 and above with the O-320 engine.
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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