A-74-058
NTSB Safety Recommendation — Aviation
Recommendation text
REQUIRE THE MODIFICATION OF THE HARTZELL MODEL T10282HB PROPELLER BLADE MANUFACTURING PROCESSES AND QUALITY CONTROL PROCEDURES TO CORRECT: A. THE MANUFACTURING PROCESSES WHICH MAY BE CAUSING SURFACE CRACKS TO ORIGINATE. B. THE SURFACE TREATMENT PROCESSES WHICH MAY INTRODUCE CORROSIVE ELEMENTS INTO PREEXISTING SURFACE CRACKS. C. THE QUAL ITY CONTROL PROCEDURES TO ENSURE THE DETECTION OF SMALL SURFACE CRACKS.
In plain language (FlightFinder summary)
The FAA is asked to ensure that Hartzell updates its manufacturing and quality control methods for a specific propeller blade model. These changes aim to stop surface cracks from forming, prevent corrosive substances from worsening existing flaws, and improve the ability to detect small defects during production.
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 | Nov 27, 1974 |
| NTSB number | CHI74IC091 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).