AD 90-06-03 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 172 | Airworthiness Directives; CESSNA Model 172 Airplanes |
| aircraft | Cessna Aircraft Company | 172A | Airworthiness Directives; CESSNA Model 172 Airplanes |
| aircraft | Cessna Aircraft Company | 172B | Airworthiness Directives; CESSNA Model 172 Airplanes |
| aircraft | Cessna Aircraft Company | 172C | Airworthiness Directives; CESSNA Model 172 Airplanes |
| aircraft | Cessna Aircraft Company | 172D | Airworthiness Directives; CESSNA Model 172 Airplanes |
| aircraft | Cessna Aircraft Company | 172E | Airworthiness Directives; CESSNA Model 172 Airplanes |
| aircraft | Cessna Aircraft Company | 172F (USAF T-41A) | Airworthiness Directives; CESSNA Model 172 Airplanes |
| aircraft | Cessna Aircraft Company | 172G | Airworthiness Directives; CESSNA Model 172 Airplanes |
| aircraft | Cessna Aircraft Company | 172H (USAF T-41A) | Airworthiness Directives; CESSNA Model 172 Airplanes |
| aircraft | Cessna Aircraft Company | 172I | Airworthiness Directives; CESSNA Model 172 Airplanes |
Unsafe Condition
Cracking of the exhaust heater/muffler that could result in dangerous carbon monoxide levels.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the exhaust heater/muffler assembly for cracks using procedures in Cessna Service Manuals or by removing and disassembling the assembly, submerging in water, and pressure testing at 5 pounds p.s.i. Replace the muffler if cracks or leakage are found. Modify the airplane with Cessna Service Kit SK-172-10A.
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, unless already accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Cessna Model 172 airplanes (serial numbers 36216 through 36769) not modified with Cessna Service Kit SK-172-10 or SK-172-10A
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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