# SDR ASAA2023042042963

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 20, 2023
- Submitted: April 24, 2023
- Operation: Air carrier
- Aircraft: [N516AS](https://openairdocs.org/aircraft/N516AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 39044
- Aircraft time: 51,870 hours, 15,412 cycles
- System (JASC): [2840 · Fuel Indicating System](https://openairdocs.org/jasc/2840)
- Part: Processing Unit
- Part number: 3012803
- Part serial: 2880
- Condition: Faulty
- Location: Radar Bay
- Part time: 51,870 hours, 15,412 cycles
- Stage of operation: CR
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023042042963

## Discrepancy

OGG TO SJC DURING CRUISE WITH CENTER TANK FUEL LEFT MAIN TANK DROPPED TO ABOUT 400LBS THAN THE RIGHT TANK FUEL FLOW WAS SLIGHTLY HIGHER ON THE # 1 ENGINE VS THE # 2 ENGINE. GROUNDED - YES. FQIS BITE PASSES BUT SYSTEM HAS HISTORY AND FAULT HISTORY SHOWS PROCESSOR FAILED. REMOVED FUEL QUANTITY PROCESSOR UNIT IAW B737-800 AMM 28-41-81. PERFORMED FUEL QUANTITY OPERATIONAL TEST PER AMM 28-41-00-710-801, OPS CHECK GOOD NO FAULTS NOTED.

---
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.