# SDR ASAA2021051534824

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 15, 2021
- Submitted: May 17, 2021
- Operation: Air carrier
- Aircraft: [N472AS](https://openairdocs.org/aircraft/N472AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 60580
- Aircraft time: 22,778 hours, 7,179 cycles
- Engine: Cfmint CFM567B27E
- System (JASC): [7332 · Fuel Pressure Indicating](https://openairdocs.org/jasc/7332)
- Part: Pressure Switch
- Part number: QA07995
- Part serial: RF32587
- Condition: Faulted
- Location: Nr 1 Fuel System
- Part time: 5,838 hours, 1,706 cycles
- Stage of operation: CR
- 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/ASAA2021051534824

## Discrepancy

DURING CRUISE FLIGHT, #1 ENG FUEL FILTER BYPASS LIGHT ILLUMINATED. GROUNDED - YES. PER SEAMC R/R FUEL FILTER REF B737-900 AMM 73-11-02, NO LEAKS NOTED, FILTER BYPASS ILLUMINATED DURING ENGINE RUN. PERFORMED B737-900 FIM 73-05 TASK 801 FOUND FILTER BYPASS STATUS CLOGGED AND NO SIGNALS DISAGREE MAINTENANCE MESSAGES, R/R FUEL FILTER DIFFERENTIAL PRESSURE SWITCH REF AMM 73-34-01, NO LEAKS NOTED, LIGHT DID NOT ILLUMINATE DURING ENGINE RUN.

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