AD 69-15-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 170 | Airworthiness Directives; CESSNA Models 170, 172, and 175 Series Airplanes |
| aircraft | Cessna Aircraft Company | 170A | Airworthiness Directives; CESSNA Models 170, 172, and 175 Series Airplanes |
| aircraft | Cessna Aircraft Company | 170B | Airworthiness Directives; CESSNA Models 170, 172, and 175 Series Airplanes |
| aircraft | Cessna Aircraft Company | 172 | Airworthiness Directives; CESSNA Models 170, 172, and 175 Series Airplanes |
| aircraft | Cessna Aircraft Company | 172A | Airworthiness Directives; CESSNA Models 170, 172, and 175 Series Airplanes |
| aircraft | Cessna Aircraft Company | 172B | Airworthiness Directives; CESSNA Models 170, 172, and 175 Series Airplanes |
| aircraft | Cessna Aircraft Company | 172C | Airworthiness Directives; CESSNA Models 170, 172, and 175 Series Airplanes |
| aircraft | Cessna Aircraft Company | 172D | Airworthiness Directives; CESSNA Models 170, 172, and 175 Series Airplanes |
| aircraft | Cessna Aircraft Company | 172E | Airworthiness Directives; CESSNA Models 170, 172, and 175 Series Airplanes |
| aircraft | Cessna Aircraft Company | 172F (USAF T-41A) | Airworthiness Directives; CESSNA Models 170, 172, and 175 Series Airplanes |
Unsafe Condition
Cracks, corrosion, burn-throughs, heat damage, collapsed stack, or weld separations in the Piper Muffler Assembly (P/N 10308-00) installed with Lycoming engines under Supplemental Type Certificates SA3-13, SA3-126, SA3-571, SA3-672, SA3-674, SA135CE, SA420CE, SA421CE, or SA424CE.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect muffler assemblies with less than 950 hours' time in service on the effective date within next 50 hours' time in service and thereafter at intervals not exceeding 100 hours until 950 hours' time in service. For those with over 950 hours, inspect within next 50 hours and thereafter every 50 hours. Inspections require removing muffler, disconnecting components, and visually inspecting for defects. Replace or repair defective parts before further flight, with welding repairs and pressure testing per AC 43.13-1 or approved equivalent.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as indicated.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Cessna Models 170, 172, and 175 series airplanes modified with Supplemental Type Certificates SA3-13, SA3-126, SA3-571, SA3-672, SA3-674, SA135CE, SA420CE, SA421CE, or SA424CE, incorporating Piper Muffler Assembly P/N 10308-00 with Lycoming engines.
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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