A-97-111
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FAA: ISSUE A NEW OR REVISED AIRWORTHINESS DIRECTIVE, ADDRESSING ALL TEXTRON LYCOMING IO-320-B1A ENGINES WHOSE CRANKSHAFT HAVE THE OLDER STYLE THINNER PROPELLER MOUNTING FLANGE (REGARDLESS OF AIRPLANE ON WHICH THE ENGINE IS INSTALLED), TO REQUIRE APPROPRIATE INSPECTION OF THE PROPELLER MOUNTING FLANGE FOLLOWING PERFORMANCE OF SPECIFIED MANEUVERS THAT CAN GENERATE HIGH STRESSES IN THE FLANGE AREA.
In plain language (FlightFinder summary)
The NTSB asks the FAA to issue a new or revised airworthiness directive for Textron Lycoming IO-320-B1A engines with the older, thinner propeller mounting flange, requiring inspection of the flange after specific maneuvers that create high stress in that area.
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 - Reconsidered |
|---|---|
| Mode | Aviation |
| Closed | Feb 8, 1999 |
| NTSB number | CHI96FA278 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).