A-92-016
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: ISSUE AN AIRWORTHINESS DIRECTIVE TO REQUIRE THAT THE ROCKER SHAFT BOSSES ON THE HEAD OF TELEDYNE CONTINENTAL MOTORS P/N 641917 CYLINDERS AND EARLIER VERSIONS OF THE CYLINDER BE SUBJECTED TO PERIODIC NONDESTRUCTIVE INSPECTIONS, USING A METHOD SUCH AS A PENETRANT INSPECTION, TO DETECT THE PRESENCE OF CRACKS OR OTHER DEFECTS. THE BOSSES SHOULD BE INSPECTED, AS A MINIMUM, EACH TIME THE CYLINDER OR THE ENGINE CONTAINING THE CYLINDER IS OVERHAULED. CYLINDER HEADS WITH BOSSES THAT ARE FOUND TO CONTAIN CRACKS OR DEFECTS SHOULD BE REMOVED FROM SERVICE.
In plain language (FlightFinder summary)
The FAA is asked to issue an airworthiness directive requiring periodic nondestructive inspections, such as penetrant inspection, of the rocker shaft bosses on Teledyne Continental Motors cylinders (part number 641917 and earlier versions). These inspections must occur at minimum each time the cylinder or engine is overhauled, to detect cracks or defects. Cylinder heads with cracked or defective bosses should be removed from 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 | Jun 7, 1994 |
| NTSB number | MIA91FA017 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).