A-81-069
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FEDERAL AVIATION ADMINISTRATION: ISSUE AN AIRWORTHINESS DIRECTIVE TO: (1) REQUIRE, AT APPROPRIATE PERIODIC INTERVALS, THE PERFORMANCE OF THE ALTITUDE ACCELERATION AND STALL CHECK PROCEDURE DEFINED IN THE CJ610-6 OVERHAUL MANUAL ON LEAR AIRCRAFT WITH GENERAL ELECTRIC CJ610-6 ENGINES INSTALLED; AND (2) RESTRICT THE MAXIMUM OPERATING ALTITUDE OF THOSE ENGINES SHOWN BY THE TEST PROCEDURE TO HAVE A REDUCED ALTITUDE STALL MARGIN UNTIL THE MANUFACTURER HAS DEVELOPED A SATISFACTORY METHOD FOR RECOVERING STALL MARGIN AND IT IS INCORPORATED IN THOSE ENGINES.
In plain language (FlightFinder summary)
The NTSB asks the FAA to issue an airworthiness directive. The directive would require performing the altitude acceleration and stall check procedure from the CJ610-6 overhaul manual at periodic intervals on Lear aircraft with General Electric CJ610-6 engines. It would also restrict the maximum operating altitude of engines that show a reduced altitude stall margin in that test until the manufacturer develops and incorporates a method to recover stall margin.
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 | Sep 14, 1981 |
| NTSB number | DCA81IA004 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).