AD 79-02-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 152 | Airworthiness Directives; CESSNA Models 152 and A152 Airplanes |
| aircraft | Cessna Aircraft Company | A152 | Airworthiness Directives; CESSNA Models 152 and A152 Airplanes |
Unsafe Condition
Contamination of cabin heater air with carbon monoxide due to insufficient clearance between the exhaust pipe and cowl opening or cracks in the heater muffler can of KMR Industries exhaust systems.
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Required Actions
Visually inspect exhaust pipe/cowl clearance and enlarge cowl opening if needed. Inspect heater muffler for perforated baffle system; if present, identify exhaust system type. For KMR systems, safety wire cabin heat valve control arm, inspect heater muffler can for cracks/spot welds every 50 hours time-in-service, and replace/repair cracked mufflers with serial number 4000 or above. Follow specific repair procedures including hose disconnection and safety wiring if cracks exceed limits. Discontinue inspections after installing compliant muffler and shroud dam.
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Compliance Time
Before next flight (for initial inspection and safety wiring), within the next 10 hours time-in-service and each 50 hours time-in-service thereafter (for recurring inspections).
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Affected Aircraft
Cessna Models 152 (Serial Numbers 15279406 through 15282919) and A152 (Serial Numbers A1520735 through A1520845) with Cessna original equipment type exhaust systems.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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