AD 70-05-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | True Flight Holdings LLC | AA-1 | Airworthiness Directives; American Aviation Model AA-1 Aircraft |
Unsafe Condition
Cracks in the muffler or shroud assembly (P/N 14-504001) adjacent to welds could allow exhaust fumes to enter the cabin heat system.
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Required Actions
Inspect muffler and shroud assembly for cracks near welds, pressure test if visual inspection is not possible, repair cracks with Heliarc welding, check alignment of rigid brace P/N 503008-501 with tailpipe, and follow Advisory Circular 43.13-1 guidelines. Repetitive inspections every 50 hours in service are required unless a new Turbo system P/N 099001-113 is installed.
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Compliance Time
within the next 10 hours in service after the effective date of this Airworthiness Directive, unless already accomplished, and thereafter at intervals not to exceed 50 hours in service from the last inspection
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Affected Aircraft
American Aviation Model AA-1 aircraft, Serial Nos. AA-1-0001 through AA-1-0159.
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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