AD 83-07-20
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aermacchi S.p.A. | S.205 - 22/R | Airworthiness Directives; SIAI-MARCHETTI Model S205-22R Airplanes |
Unsafe Condition
Failure of the exhaust system due to cracks in the inside baffling of the muffler assembly P/N 870-8 or P/N 870-9.
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Required Actions
Perform a fiberscope inspection of the muffler assembly's inside baffling using an OLYMPUS ILK-2 type fiberscope or equivalent, following SIAI-Marchetti Service Bulletin No. 205B56. If cracks are found, replace the muffler before further flight. Continue inspections every 100 hours time-in-service if no cracks are found.
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Compliance Time
Within the next 100 hours time-in-service after the effective date (April 14, 1983) or when the muffler has accumulated 500 hours time-in-service, whichever occurs later, and at each 100-hour time-in-service interval thereafter.
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Affected Aircraft
Aermacchi S.p.A. Model S.205-22/R airplanes with muffler assembly part numbers 870-8 or 870-9 installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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