AD 47-47-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Martin-Marietta Corporation | 202 | Martin Model 202 Aircraft |
Unsafe Condition
Cracks at combustion chamber and heat exchanger end plates on Stewart-Warner 921-B heaters in cabin and wing systems may lead to heater failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect combustion chamber and heat exchanger end plates for cracks at specified intervals. Replace heaters showing impending failure. Conduct complete inspections and pressure tests every 300/600 hours (cabin/wing) and repeat at shorter intervals post-initial inspection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Inspections must be conducted before further flight as per the specified intervals: cabin heaters at each 30 hours, wing heaters at each 60 hours. Complete inspections every 300/600 hours (cabin/wing), then every 100/200 hours thereafter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Martin-Marietta Corporation Model 202 Aircraft with Stewart-Warner 921-B heaters in cabin and wing systems.
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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