AD 70-03-04 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 320D | Airworthiness Directives; CESSNA Models T310P, T310Q, 320D, 320E, 320F, 401, 401A, 401B, 402, 402A and 402B Airplanes |
| aircraft | Cessna Aircraft Company | 320E | Airworthiness Directives; CESSNA Models T310P, T310Q, 320D, 320E, 320F, 401, 401A, 401B, 402, 402A and 402B Airplanes |
| aircraft | Cessna Aircraft Company | 320F | Airworthiness Directives; CESSNA Models T310P, T310Q, 320D, 320E, 320F, 401, 401A, 401B, 402, 402A and 402B Airplanes |
| aircraft | Cessna Aircraft Company | 401 | Airworthiness Directives; CESSNA Models T310P, T310Q, 320D, 320E, 320F, 401, 401A, 401B, 402, 402A and 402B Airplanes |
| aircraft | Cessna Aircraft Company | 401A | Airworthiness Directives; CESSNA Models T310P, T310Q, 320D, 320E, 320F, 401, 401A, 401B, 402, 402A and 402B Airplanes |
| aircraft | Cessna Aircraft Company | 401B | Airworthiness Directives; CESSNA Models T310P, T310Q, 320D, 320E, 320F, 401, 401A, 401B, 402, 402A and 402B Airplanes |
| aircraft | Cessna Aircraft Company | 402 | Airworthiness Directives; CESSNA Models T310P, T310Q, 320D, 320E, 320F, 401, 401A, 401B, 402, 402A and 402B Airplanes |
| aircraft | Cessna Aircraft Company | 402A | Airworthiness Directives; CESSNA Models T310P, T310Q, 320D, 320E, 320F, 401, 401A, 401B, 402, 402A and 402B Airplanes |
| aircraft | Cessna Aircraft Company | 402B | Airworthiness Directives; CESSNA Models T310P, T310Q, 320D, 320E, 320F, 401, 401A, 401B, 402, 402A and 402B Airplanes |
| aircraft | Cessna Aircraft Company | T310P | Airworthiness Directives; CESSNA Models T310P, T310Q, 320D, 320E, 320F, 401, 401A, 401B, 402, 402A and 402B Airplanes |
Unsafe Condition
Cracks, bulges, and burnt areas in the turbosupercharger turbine housing could lead to turbine housing failure, resulting in uncontained engine failure or fire.
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Required Actions
Inspect the turbine housing for cracks, bulges, and burnt areas. Replace defective parts before further flight. Install stainless steel heat shields per Cessna ME72-4 to terminate inspections.
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Compliance Time
Within 25 hours time-in-service after the effective date on housings with 400+ hours TIS, or at or before 425 hours TIS on housings with less than 400 hours TIS, and thereafter every 100 hours TIS unless heat shields are installed.
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Affected Aircraft
Cessna Models T310P (0001-0240), T310Q (0001-0291), 320D (0001-0130), 320E (0001-0110), 320F (0001-0045), 401 (0001-0322), 401A (0001-0132), 401B (0001-0121), 402 (0001-0322), 402A (0001-0129), 402B (0001-0122) equipped with Teledyne Continental TSIO-520B or TSIO-520E engines.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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