# SDR CALA2026061517084

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 12, 2026
- Submitted: June 15, 2026
- Operation: Air carrier
- Aircraft: [N17405](https://openairdocs.org/aircraft/N17405), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 67647
- Aircraft time: 3,814 hours, 1,251 cycles
- System (JASC): [3444 · Ground Proximity System](https://openairdocs.org/jasc/3444)
- Part: Control Switch
- Part number: D72403001
- Part serial: 6370
- Condition: Faulted
- Location: Zone 200
- Part time: 3,796 hours, 1,247 cycles
- Stage of operation: AP
- 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/CALA2026061517084

## Discrepancy

TOO LOW GEAR AURAL NO FAULT ON AHM, NO EXISTING ON CH34. BITE TEST PSEU AND LGTV ALL PASSED. DEBRIEFED CREW ON ARRIVAL. WARNING GIVEN AT 500FT, FLAPS 30, GEAR INDICATION ALL GREEN. NO DISCREPANCIES PRESENT WHEN MX ENTERED FLIGHT DECK. INTERROGATED PSEU AND EGPWS, NO FAULTS FOUND. AHM SHOWS NO FAULTS. NO 90-DAY HISTORY FOR FAULTS RELATED TO PSEU OR GPWS. ENGINEERING CALLOUT TO CHANGE LANDING GEAR CONTROL LEVER SWITCH. CITED REFERENCES SSM 34-49-11-106, 34-49-00-019, WDM 34-49-11-09, 32-31-15-2, 31-31-15-4. REPLACED LEVER SWITCH AMM 32-31-11. ALL OPS TESTS GOOD.

---
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.