What was found
EACH TIME ALTITUDE HOLD IS DISENGAGED, A/C ABRUPTLY PITCHES UP AND CLIMB AT 500-100 FPM, STAB OUT OF TRIM LIGHT IS NOT ILLUMINATED. COULD NOT DUPLICATE ON GROUND. AUTO PILOT ALTITUDE HOLD CHECKS GOOD IAW B727 M/M 22-11-01. NO HISTORY.
- Difficulty date
- September 25, 2001
- Submitted
- September 26, 2001
- Operation
- Air carrier
- Aircraft
- N721DH
- Make and model
- Boeing 727228
- Aircraft serial
- 19545
- System (JASC)
- 2212 · Altitude Controller
- Part
- Autopilot Sys
- Condition
- Malfunctioned
- Location
- Cockpit
- Stage of operation
- CR
- How discovered
- O
- Nature of condition
- F
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.