# SDR CALA2026102620575

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 21, 2026
- Submitted: October 26, 2026
- Operation: Air carrier
- Aircraft: [N37508](https://openairdocs.org/aircraft/N37508), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 43439
- Aircraft time: 20,051 hours, 6,631 cycles
- Engine: Cfmint LEAP1B28
- System (JASC): [2211 · Autopilot Computer](https://openairdocs.org/jasc/2211)
- Part: Switch
- Part number: 2PB11T2
- Condition: Faulted
- Location: Zone 200
- 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/CALA2026102620575

## Discrepancy

FO MA ON BOTH FD LOST AT LIFT OFF. CAME BACK ON AFTER SELECTIN G HDG SEL AND VNAV ABOVE 400FT. TECH SUPPORT.   TAT PROBE, RT ADIRU AND RT FCC REPLACED=NO HELP REF FIM 22-11-D16. PULL UP SSM 22-11-14-101. ACCESS DFCS BITE " DISCREET INPUTS THROUGH THE CDU REF AMM 22-11-00-740-801.GO TO "J1A" WHICH IS THE FCC BENCH PLUG "A" CONNECTOR AND LOOK AT PIN "F4". CYCLE THE CAPT AND THEN THE F/O SIDE TO/GA SWITCHES ONE AT A TIME AND WATH FOR THE STATUS.CHANGE.SUSPECT F/O TO/GA SWITCH. AS PER TECH SUPPORT RECOMMENDATION, R/R FO TAKEOFF/GO-AROUND SWITCH REF. AMM 22-11-39. OPS CHECK GOOD. UNABLE TO DUPLICATE ORIGINAL FAULT.

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