A-00-041
NTSB Safety Recommendation — Aviation
Recommendation text
THE NTSB RECOMMENDS THAT THE FAA: REQUIRE OPERATORS OF BOEING 727 AIRCRAFT EQUIPPED WITH SPERRY AEROSPACE SP-50 AND SP-150 AUTOPILOTS TO PERFORM THE MODIFICATIONS DESCRIBED IN SPERRY SERVICE BULLETIN (SB) 21-1132-121 (FOR SP-50 AUTOPILOTS) AND SB 21-1132-122 (FOR SP-150 AUTOPILOTS) IF THESE 727 AIRCRAFT ARE USED FOR COUPLED INSTRUMENT LANDING SYSTEM CATEGORY II APPROACHES AT FLAP SETTINGS LESS THAN 40.
In plain language (FlightFinder summary)
The FAA is asked to require operators of Boeing 727 aircraft with Sperry SP-50 and SP-150 autopilots to carry out modifications specified in Sperry Service Bulletins 21-1132-121 (for SP-50) and 21-1132-122 (for SP-150), if these aircraft are used for coupled instrument landing system Category II approaches with flap settings less than 40.
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 | Jan 14, 2004 |
| NTSB number | DCA98MA023 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).