A-86-004
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: AMEND AIRWORTHINESS DIRECTIVE 75-23-08 APPLICABLE TO CESSNA T310, 320, 340, 401, AND 411 SERIES AIRPLANES AND TO MODEL 402, 402A, 402B, 414, 421, 421A, AND 421B AIRPLANES TO: (A) REQUIRE A SUPPLEMENTAL DETAILED INSPECTION OF ENGINE EXHAUST MANIFOLD ASSEMBLIES, WYE ASSEMBLIES, TURBO INLET ELBOW ASSEMBLIES, AND COLLECTOR ASSEMBLIES FOR CRACKS OR SIGNIFICANT MATERIAL DEGRADATION DUE TO EXHAUST GAS EROSION; OR (B) REQUIRE REPLACEMENT OF ENGINE EXHAUST MANIFOLD ASSEMBLIES, WYE ASSEMBLIES, TURBO INLET ELBOW ASSEMBLIES, AND COLLECTOR ASSEMBLIES AT APPROPRIATE PERIODIC INTERVALS. INSPECTION SHOULD REQUIRE REMOVAL OF ATTACHING CLAMPS AND ASSEMBLY COMPONENTS, OR COMPLETE ASSEMBLIES AS NECESSARY, AT APPROPRIATE PERIODIC INTERVALS. THE DISCOVERY OF CRACKS, EXCESSIVELY WORN FLANGES, SUBSTANTIAL TUBE WALL EROSION, OR OTHER DEFECTIVE CONDITIONS SHOULD REQUIRE THE REPAIR OR REPLACEMENT OF AFFECTED COMPONENTS OR ASSEMBLIES BEFORE FURTHER FLIGHT.
In plain language (FlightFinder summary)
The NTSB asks the FAA to update an existing airworthiness directive for multiple Cessna models. The update would require either a detailed inspection of certain exhaust system parts for cracks or erosion, or their replacement at set intervals, with repairs mandated before further flight if defects are found.
This plain-language summary is written by FlightFinder to explain the recommendation above. It is not the official wording — the verbatim NTSB text is quoted above.
Details
| Status | Closed - Unacceptable Action |
|---|---|
| Mode | Aviation |
| Closed | Oct 2, 1987 |
| NTSB number | FTW85FA112 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).