What was found
DURING LEVEL CRUISE WITH AUTOPILOT A OR B ENGAGED, AIRCRAFT OCCASIONALLY GAINED 150 FT ALTITUDE WHILE ALTITUDE HOLD MODE ENGAGED. REPLACED MACH TRIM ACTUATOR PER MM 22-21-11.
- Difficulty date
- February 17, 2004
- Submitted
- February 20, 2004
- Operation
- Air carrier
- Aircraft
- N371PA
- Make and model
- Boeing 737306
- Aircraft serial
- 23543
- Aircraft time
- 34,564 hours, 26,149 cycles
- System (JASC)
- 2210 · Autopilot System
- Part
- Actuator
- Part number
- 2A72004
- Condition
- Malfunctioned
- Location
- Mach Trim
- Stage of operation
- CR
- How discovered
- O
- Nature of condition
- O
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.