# SDR CALA2026012613242

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 26, 2026
- Submitted: January 27, 2026
- Operation: Air carrier
- Aircraft: [N37420](https://openairdocs.org/aircraft/N37420), registered now
- Make and model: Boeing 737924ER
- Aircraft serial: 33457
- Aircraft time: 54,428 hours, 19,297 cycles
- System (JASC): [2230 · Auto Throttle System](https://openairdocs.org/jasc/2230)
- Part: Switchpack
- Part number: 142147
- Part serial: 307
- Condition: Inoperative
- Location: Autothrottle
- Part time: 40,053 hours, 14,985 cycles
- Stage of operation: NR
- 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/CALA2026012613242

## Discrepancy

ANTI-SKID INOPERATIVE LIGHT.  ON CREW DEBRIEF. THEY HAD BOTH ANTI-SKID & AUTO BRAKE LIGHTS COME ON. ON FINAL,TURNED AUTO BRAKE OFF & BACK . BOTH FAULT LIGHTS CAME BACK ON . T/S IAW FIM 32-42 TASK 801. AACU FAULT MESSAGE READS POWER A/B.  IAW FAULT MESSAGE TROUBLESHOT IAW FIM TASK 32-42 TASK 826, 22-30V DC PRESENT AT A11 & C9. R & R AACU IAW 32-42-21-000-801 AS PRECAUTION, NO HELP.  BITE STILL GIVES FAULTS MESSAGE POWER A/B.  IAW FIM TASK STEP 2, PROCCEDED TO T/S AUTO THROTTLE SWITCH PACKS. FOUND EXCESSIVE AMOUNT OF RESISTANCE FOR PINS 5 & 6 OF LEFT AUTO THROTTLE SWITCH PACK ( M1766) AT IDLE.  R & R LT AUTO THROTTLE SWITCH PACK (M1766) IAW AMM 76-11-07-020-801-F00.  SECURED HARDWARE OF LT SWITCH PACK (M1766),

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.