AD 78-09-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 336 | Airworthiness Directives; CESSNA Models 336, 337, 337A, 337B, T337B, 337C, T337C, 337D, T337D, 337E, T337E, 337F, T337F, T337G, 337H, T337H, T337G, P337H and M337B Airplanes |
| aircraft | Cessna Aircraft Company | 337 | Airworthiness Directives; CESSNA Models 336, 337, 337A, 337B, T337B, 337C, T337C, 337D, T337D, 337E, T337E, 337F, T337F, T337G, 337H, T337H, T337G, P337H and M337B Airplanes |
| aircraft | Cessna Aircraft Company | 337A | Airworthiness Directives; CESSNA Models 336, 337, 337A, 337B, T337B, 337C, T337C, 337D, T337D, 337E, T337E, 337F, T337F, T337G, 337H, T337H, T337G, P337H and M337B Airplanes |
| aircraft | Cessna Aircraft Company | 337B | Airworthiness Directives; CESSNA Models 336, 337, 337A, 337B, T337B, 337C, T337C, 337D, T337D, 337E, T337E, 337F, T337F, T337G, 337H, T337H, T337G, P337H and M337B Airplanes |
| aircraft | Cessna Aircraft Company | 337C | Airworthiness Directives; CESSNA Models 336, 337, 337A, 337B, T337B, 337C, T337C, 337D, T337D, 337E, T337E, 337F, T337F, T337G, 337H, T337H, T337G, P337H and M337B Airplanes |
| aircraft | Cessna Aircraft Company | 337D | Airworthiness Directives; CESSNA Models 336, 337, 337A, 337B, T337B, 337C, T337C, 337D, T337D, 337E, T337E, 337F, T337F, T337G, 337H, T337H, T337G, P337H and M337B Airplanes |
| aircraft | Cessna Aircraft Company | 337E | Airworthiness Directives; CESSNA Models 336, 337, 337A, 337B, T337B, 337C, T337C, 337D, T337D, 337E, T337E, 337F, T337F, T337G, 337H, T337H, T337G, P337H and M337B Airplanes |
| aircraft | Cessna Aircraft Company | 337F | Airworthiness Directives; CESSNA Models 336, 337, 337A, 337B, T337B, 337C, T337C, 337D, T337D, 337E, T337E, 337F, T337F, T337G, 337H, T337H, T337G, P337H and M337B Airplanes |
| aircraft | Cessna Aircraft Company | 337G | Airworthiness Directives; CESSNA Models 336, 337, 337A, 337B, T337B, 337C, T337C, 337D, T337D, 337E, T337E, 337F, T337F, T337G, 337H, T337H, T337G, P337H and M337B Airplanes |
| aircraft | Cessna Aircraft Company | 337H | Airworthiness Directives; CESSNA Models 336, 337, 337A, 337B, T337B, 337C, T337C, 337D, T337D, 337E, T337E, 337F, T337F, T337G, 337H, T337H, T337G, P337H and M337B Airplanes |
Unsafe Condition
Cracking of the wing front and rear spar lower caps, front spar web and web doubler.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the right and left wing front and rear spar lower cap and front spar web and web doubler at specified intervals using eddy current and dye penetrant methods. Replace cracked components in both wings before return to service. Report findings to FAA and adjust inspection intervals as allowed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 25 hours time-in-service after the effective date of this AD for airplanes not previously inspected, or within 500 hours time-in-service after the last inspection under prior ADs. Repetitive inspections every 500 hours for non-pressurized (5,000+ hours) or pressurized (10,000+ hours) airplanes, or 300 hours for those with low altitude operations as urged.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Cessna Models 336, 337, 337A, 337B, T337B, 337C, T337C, 337D, T337D, 337E, T337E, 337F, T337F, T337G, 337H, T337H, P337H, M337B with specific serial ranges: 336-0001-0195, 337-0001-1193, 33701194-33701852, P3370001-P3370313, and all M337B serial numbers.
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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