A-92-081
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: DEVELOP, WITH THE ASSISTANCE OF HARTZELL PROPELLER, INCORPORATED, A NONDESTRUCTIVE INSPECTION TECHNIQUE CAPABLE OF DETECTING HUB ARM CRACKS STEMMING FROM THE INSIDE DIAMETER SURFACE OF THE HUB ARM AT THE APPROXIMATE LOCATION OF THE INSERTED END OF THE PILOT TUBES ON HARTZELL MODEL HC-B4 PROPELLER HUBS, AND ISSUE AN AIRWORTHINESS DIRECTIVE REQUIRING THAT HC-B4 HUBS WITH 3,000 HOURS OR MORE BE INSPECTED USING THIS TECHNIQUE THE NEXT TIME THE PROPELLER ASSEMBLY IS OVERHAULED FOR ANY REASON, OR AT THE NEXT ANNUAL INSPECTION (OR EQUIVALENT), WHICH EVER IS FIRST.
In plain language (FlightFinder summary)
The FAA is asked to work with Hartzell Propeller to create a nondestructive inspection method for detecting cracks in the hub arm of Hartzell Model HC-B4 propeller hubs, specifically near the pilot tube insertion, and to issue an airworthiness directive mandating inspection of hubs with 3,000 or more hours at the next overhaul or annual inspection, whichever comes first.
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 Alternate Action |
|---|---|
| Mode | Aviation |
| Closed | Apr 3, 1995 |
| NTSB number | NYC91LA250 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).