# SDR CALA2026080718349

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 6, 2026
- Submitted: August 7, 2026
- Operation: Air carrier
- Aircraft: [N17467](https://openairdocs.org/aircraft/N17467), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 67659
- Aircraft time: 11 hours, 8 cycles
- System (JASC): [2781 · Leading Edge Slat Position Indicating System](https://openairdocs.org/jasc/2781)
- Part: Proximity Sensor
- Part number: 8020702
- Condition: Faulted
- Location: Le Flaps
- Stage of operation: CR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026080718349

## Discrepancy

LE FLAPS TRANSIT LIGHT AT FL37000 AND SMOOTH WOULD NOT CLEAR POST NON NORMAL CHKLIST CHECKED INBOUND FLT DECK EFFECTS, FOUND MAINT MESSAGE 27-81220 LATCHED.IAW  FIM 27-81 TASK 826. VERIFIED CB'S CLOSED. MAINT MESSAGE 27-51101 NOT PRESENT IN EXISTING FAULTS.  PERFORMED RESISTANCE & INDUCTANCE MEASUREMENTS WITH AN LCR METER IAW AMM 27-88-11-760-801. FOUND RESISTANCE OF BLUE-YELLOW LEADS AT 354.72 OHMS, WHICH IS ABOVE LIMITS OF 351.50 OHMS. RED-YELLOW LEADS MEASURED AT 72.87 OHMS, WHICH IS LESS THAN 100 OHM LIMIT. CHKD INDUCTANCE OF FLAPS & SLATS IN RETRACTED, EXTENDED, & FULLY EXTENDED POSITIONS IAW AMM 27-88-11-760-801. ALL INDUCTANCE MEASUREMENTS WITHIN LIMITS OF 44.53MH AT RETRACTED, 35.73MH AT EXTENDED & FULLY EXTENDED POSITIONS. SUSPECT PROX SENSOR S172 IS AT FAULT.   REPLACED PROX SENSOR S172, OPS CHKD GOOD IAW AMM 27-88-11-400-802 AND WDM 27-81-21-1 PG 1.

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