# SDR CALA2026020413578

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 1, 2026
- Submitted: February 4, 2026
- Operation: Air carrier
- Aircraft: [N57857](https://openairdocs.org/aircraft/N57857), registered now
- Make and model: Boeing 757324
- Aircraft serial: 32816
- Aircraft time: 63,417 hours, 20,200 cycles
- System (JASC): [2841 · Fuel Quantity Indicator](https://openairdocs.org/jasc/2841)
- Part: Processing Unit
- Part number: 300710505
- Part serial: 1018
- Condition: Faulted
- Location: Zone 100
- Part time: 50,665 hours, 12,936 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: P
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026020413578

## Discrepancy

CENTER FUEL TANK GAUGE WENT BLANK AFTER TAKE OFFON ARRIVAL FUEL QTY PROCESSOR BITE INDICATED AS FOLLOWS: PRESENT FAULTS - CT HIZ WIRE OPEN AT SPAR (G). LEG 00 FAULTS - CT HIZ SHIELD OPEN AT SPAR (A06), CT TU 3 SHORTED IN TANK (A01), CT HIZ WIRE OPEN AT SPAR (A05). SELF TEST- CT HIZ WIRE OPEN AT SPAR (G). FAULTS APPEAR TO RELATE TO LEFT CENTER HARNESS IAW WDM 28-41-51-2. FUEL QTY TEST SYS INTERFACE BOX PSD60 NOT AVAIL HNL. UPON ARRIVAL, ALL TANK UNITS IN LEFT CTR TANK SHOWED READINGS OF 0.0 PF. RT CTR TANK SHOWED AN AVERAGE 110.0 PF FOR EACH UNIT. AFTER SITTING, INIDICATIONS STABILIZED & CAPACITANCE MATCHED FOR LT & RT CTR TANK UNITS. SELF TEST NOW PASSES. SHOOK CONNECTOR D6892 & PRECEEDING WIRE WHILE MONITORING FUEL INDICATION FOR CTR TNK, NO FLUCTUATIONS OR BLANKING NOTED  IAW WDM 28-41-41-2.1, FIM 28-41 FAULT TREE 847. SUGGEST FUEL TANK ENTRY FOR FURTHER TROUBLESHOOTING. NO ACTIVE FAULTS AT THIS TIME, FUEL INDICATIONS NORMAL.  REPLACED FUEL QTY PROCESSOR UNIT IAW AMM28-41-08, OPS CHKD NORMAL.  OPS TEST OF FUEL QTY IND SYS, OPS CHKD GOOD IAW AMM 28-41-00-715-199-002, SELF TEST OF FQIS PROCESSOR OPS CHKD GOOD IAW AMM 28-41-00-715-082-002. IF FAULT RETURNS SUGGEST TANK ENTRY FOR HARNESS TROUBLESHOOTING.

---
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.