AD 68-21-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-23-250 (Navy UO-1) | Airworthiness Directives; Piper Model PA-23-250 and PA-E23-250 Aircraft |
| aircraft | Piper Aircraft Inc. | PA-E23-250 | Airworthiness Directives; Piper Model PA-23-250 and PA-E23-250 Aircraft |
Unsafe Condition
Failures of the exhaust tailpipe assemblies, specifically AiResearch P/N 286-P23-060-5 and P/N 286-P23-060-9, due to cracks or deformation and insufficient clearance between tailpipes and firewalls/cowl flaps.
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Required Actions
Visually inspect both left and right engine tailpipes for cracks or deformation; retire and replace affected assemblies. Inspect tailpipe clearance against firewalls and cowl flaps per AiResearch Service Bulletin No. 14.1.8; install Kit P/N 301-P23-063 if clearance is insufficient.
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Compliance Time
within 10 hours of aircraft operations after the effective date of this Airworthiness Directive, unless previously accomplished
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Affected Aircraft
Piper Model PA-23-250 and PA-E23-250 Aircraft Serial Nos. 27-2505 through 27-3858 with AiResearch Turbosupercharged Lycoming IO-540-J4A5 or IO-540-C4B5 engines installed per STC SA909WE, SA978WE, or Piper Drawing No. 32016
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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