A-69-020
NTSB Safety Recommendation — Aviation
Recommendation text
THE BOARD RECOMMENDED: EMERGENCY RECOVERY PROCEDURES BE ESTABLISHED TO AFFECT TIMELY RECOVERY FROM UNWANTED AND/OR ADVERSE LONGITUDINAL TRIM CONDITIONS. PROCEDURES BE INCORPORATED IN "EMERGENCY SECTION" OF FAA FLIGHT MANUAL TO ENSURE THAT THE PITCH TRIM CIRCUIT BREAKER IS ENGAGED WHENEVER TRIM IS ATTEMPTED. CONSIDERATION BE GIVEN FOR USE OF FLAPS TO COUNTER PITCH-OVER AND HEAVY STICK FORCES. PROVISION OF A STABILIZER "IN-TRANSIT" WARNING SYSTEM TO ALERT FLIGHT CREWS OFTHE MOVEMENT OF THE TRIM SYSTEM. CONSIDERATION BE GIVEN FOR IMPOSING RESTRICTIONS TO THE STABILIZER TRIM RANGE IN ORDER TO PREVENT EXCESSIVE NOSE-DOWN TRIM WHILE AIRCRAFT IS IN CRUISE CONFIGURATION.
In plain language (FlightFinder summary)
The FAA is asked to establish emergency recovery procedures for unwanted longitudinal trim conditions and incorporate them into flight manuals, ensuring the pitch trim circuit breaker is engaged when trim is attempted. Additionally, the FAA should consider using flaps to counter pitch-over and heavy stick forces, provide a stabilizer "in-transit" warning system, and consider imposing restrictions on stabilizer trim range to prevent excessive nose-down trim in cruise.
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 | Aug 13, 1969 |
| NTSB number | DCA70I0001 |
| Addressees | FAA |
External links
NTSB safety recommendations are advisory; addressees are not legally required to adopt them. Source: NTSB CAROL (public domain).