A-69-033
NTSB Safety Recommendation — Aviation
Recommendation text
IT IS OUR RECOMMENDATION THAT THE FEDERAL AVIATION ADMINISTRATION TAKE ACTION TO (1) REQUIRE ACCELERATED INSPECTION OF MODEL 10176 BLADES NOW IN SERVICE FOR CRACKS, DETRIMENTAL TOOL MARKS, AND ROLLING COVERAGE IN THE AREA OF THE INTERNAL FILLET, APPROXIMATELY 4 INCHES FROM THE BUTT FACE OF THE BLADE, (2) ESTABLISH MINIMUM ACCEPTABLE WALL THICKNESS VALUES, AND (3) REQUIRE MEASUREMENTS FOR COMPLIANCE ON BLADES NOW IN SERVICE AND ON NEW BLADES BEFORE THEY ARE PLACED IN SERVICE.
In plain language (FlightFinder summary)
The Federal Aviation Administration is asked to require accelerated inspections of Model 10176 blades currently in service, focusing on cracks, detrimental tool marks, and rolling coverage near the internal fillet about 4 inches from the blade's butt face. Additionally, the FAA must establish minimum acceptable wall thickness values and mandate compliance measurements for both blades now in service and new blades before they enter service.
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 - Acceptable Action |
|---|---|
| Mode | Aviation |
| Closed | Jan 13, 1970 |
| NTSB number | NYC70I0045 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).