# SDR CALA2023070502174

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 2, 2023
- Submitted: July 5, 2023
- Operation: Air carrier
- Aircraft: [N78524](https://openairdocs.org/aircraft/N78524), registered now
- Make and model: Boeing 737824
- Aircraft serial: 31642
- Aircraft time: 41,551 hours, 14,598 cycles
- System (JASC): [2200 · Auto Flight System](https://openairdocs.org/jasc/2200)
- Part: Actuator
- Part number: 158300101
- Part serial: 22744
- Condition: Inoperative
- Location: Aileron
- Part time: 41,521 hours, 14,590 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2023070502174

## Discrepancy

STAB OUT OF TRIM LIGHT LIGHT ON AT 8000FT ENGAGED A AP HAD A LARGE JOLT TO AC STAB OUT OF TRIM L IGHT APPEARED. PER FLIGHT CREW CHANNEL B WORKS NORMAL AFTER TRANSITION FROM CHANNEL A. SEE ATTACHMENT FOR FURTHER EXPLANATION. 22-11121. FIM TASK 22-12 TASK 810 SUSPECT ACTUATOR TO BE CAUSE OF PROBLEM. PREFORMED BITE FOUND DFCS SYSTEM FAULT MESSAGE 22-11337 A/P ELEVATOR ACRUATOR SYSTEM A M01020 SUSPECT TTO BE CAUSE OF FAILED RESISTANCE CK BETWEEN 11-12, 12-13, & 11-13 OPEN REF FIM PREFORMED ASSOCIATED FIM TASK 22-16 TASK 828. FOUND NO DEFECTS FAULT 22-12 TASK 810 PAR F 4. PARTS USED:  29-7311-3-0028,QTY :1 CONTINUITY CHECKS AMD VOLTAGE CHECKS GOOD. PREFORMED SURFACE 40-0595-3-1976,QTY :1  00-0596-3-0635,QTY :1  40-0595-3-0708,QTY TEST SPEED AND STAB TRIM REF 22-11 TASK 851. FOUND MESSAGE :1  29-2211-3-0008,QTY :1  29-2711-9-0020,QTY :1 ADD EMP:U399274 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1687674  SN OFF 2744 ACTUATOR, AILER  OFF 29-2711-9-0020 2744 ON 29-2711-9-0020 9419 REMOVED AND REPLACED CHANNEL A AUTOPILOT ELEVATOR ACTUATOR REF AMM 22-11-26. LEAK AND OPS CHECK OK. ALL LAND VERIFY TESTS PASSED. ADD EMP:U353556 INSTALLATION IN COMPLIANCE WITH AMM 22-11-26. AND RII

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