# SDR ASAA2013012493754

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 24, 2013
- Submitted: January 29, 2013
- Operation: Air carrier
- Aircraft: [N408AS](https://openairdocs.org/aircraft/N408AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41732
- Aircraft time: 352 hours, 132 cycles
- System (JASC): [7261 · Turbine Engine Oil System](https://openairdocs.org/jasc/7261)
- Part: Oil Filter
- Part number: 41F9003
- Condition: Failed
- Location: Nr 1 Engine
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2013012493754

## Discrepancy

ON TAXI IN LT OIL FILTER BYPASS LIGHT ILLUMINATED FOR NR 1 ENGINE. ENGINE WAS SHUT DOWN IAW QRH.  ACFT GROUNDED.  ACCOMPLISHED FIM 79-05, TASK 817 & 79-21 TASK 806.  FOUND FAULT CODE 79-31121, DUAL CHANNEL SIGNAL DISAGREE.  REPLACED NR 1 ENG SCAVENGE OIL FILTER CLOGGING TRANSMITTER REF MM 79-21-07-400-801, STEPS 3 F.(1) - 3.H.(3).  ACCOMPLISHED CLOGGING TRANSMITTER INSTALLATION TEST REF MM TASK 79-21-07-400-801, STEP 1.

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