A-90-178
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: ISSUE AN AIRWORTHINESS DIRECTIVE TO REQUIRE A ONE TIME INSPECTION OF ALL AGUSTA A109A SERIES HELICOPTER TAIL ROTOR DRIVE SHAFT SUPPORT BEARINGS, PN 109-0424-01-3, FOR EVIDENCE OF EXCESSIVE WEAR, LACK OF LUBRICATION, AND OVER HEATING. BASED ON THE RESULTS, ESTABLISH A PERIODIC INSPECTION AND LUBRICATION INTERVAL FOR THE SUPPORT BEARINGS.
In plain language (FlightFinder summary)
The FAA is asked to issue an airworthiness directive requiring a one-time inspection of all Agusta A109A series helicopter tail rotor drive shaft support bearings (part number 109-0424-01-3) for signs of excessive wear, lack of lubrication, and overheating. Based on the inspection results, the FAA should establish a periodic inspection and lubrication interval for those bearings.
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 | Mar 13, 1992 |
| NTSB number | DEN88LA094 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).