# SDR ASAA2018102426579

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 21, 2018
- Submitted: October 24, 2018
- Operation: Air carrier
- Aircraft: [N557AS](https://openairdocs.org/aircraft/N557AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35176
- Aircraft time: 47,343 hours, 13,948 cycles
- System (JASC): [3020 · Air Intake Anti/De-Ice System](https://openairdocs.org/jasc/3020)
- Part: Switch
- Part number: 21SN4152
- Condition: Defective
- Location: Anti-Ice System
- Stage of operation: TX
- How discovered: O
- Nature of condition: N
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018102426579

## Discrepancy

NR 1 COWL ANTI ICE LIGHT ILLUMINATED ON POWER UP TO TAXI FOR DEPARTURE. GROUNDED - YES. R & R ENG COWL TAI VALVE PER AMM 30-21-11. VALVE OPS CK NORMAL. BUT AMBER LIGHT NOW ILLUMINATES DIMLY ALL THE TIME. PERFORMED FIM 30-21 TASK 801. FOUND CONTINUITY BETWEEN PINS 1 AND 2 ON OVER PRESSURE SWITCH. SWITCH REQUIRES REPLACEMENT. REMOVED & REPLACED NR 1 ENGINE ANTI ICE PRESSURE SENSOR. INSTALLATION TEST PASSED PER AMM 30-21-21.

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