# JASC 2842: Fuel Quantity Sensor

- Type: JASC system/component code (FAA)
- ATA chapter: 28 Fuel
- Title in the code table: FUEL QUANTITY SENSOR
- Service difficulty reports: 544
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=28
- Page: https://openairdocs.org/jasc/2842

## What it covers

The tank unit which measures and transmits a quantity level signal to the cockpit indicator. Typical parts are transmitter, float switch, probe, sensor, totalizer, tank unit float, gasket, etc.

## Service difficulty reports (544, newest 50)

- [SDR QR9R2026090900001](https://openairdocs.org/sdr/QR9R2026090900001), Sep 9, 2026: Bolkms BK117C2. TRANSMITTER. FAILED. DURING RUN UP, FUEL QUANTITY DEGRADED, CAUTION LIGHT WAS ON AND COULD NOT BE RESET. FWD FUEL QUANTITY TRANSMITTER IN FWD
- [SDR DXTA2026081009190](https://openairdocs.org/sdr/DXTA2026081009190), Aug 7, 2026: Cndair CL6002B16. SENSOR. FAULTED. INFLIGHT AT CRUISE WE NOTICED THAT THE TAIL TANK FUEL WAS NOT TRANSFERRING. SHORTLY THERE AFTER WE RECEIVED TAIL XFER SO (N234QS)
- [SDR AALA202603063304](https://openairdocs.org/sdr/AALA202603063304), Jan 21, 2026: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AT CRUISE NOTICED ENGINE #1 WAS IMBALANCED; EXPECTED FUEL AT DE (N865NN)
- [SDR AALA202603064333](https://openairdocs.org/sdr/AALA202603064333), Jan 21, 2026: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AT CRUISE NOTICED ENGINE #1 WAS IMBALANCED; EXPECTED FUEL AT DE (N865NN)
- [SDR AALA202603061413](https://openairdocs.org/sdr/AALA202603061413), Jan 21, 2026: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AT CRUISE NOTICED ENGINE #1 WAS IMBALANCED; EXPECTED FUEL AT DE (N865NN)
- [SDR AALA202603069005](https://openairdocs.org/sdr/AALA202603069005), Jan 21, 2026: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AT CRUISE NOTICED ENGINE #1 WAS IMBALANCED; EXPECTED FUEL AT DE (N865NN)
- [SDR AALA202603060034](https://openairdocs.org/sdr/AALA202603060034), Jan 21, 2026: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AT CRUISE NOTICED ENGINE #1 WAS IMBALANCED; EXPECTED FUEL AT DE (N865NN)
- [SDR AALA202603061737](https://openairdocs.org/sdr/AALA202603061737), Jan 21, 2026: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AT CRUISE NOTICED ENGINE #1 WAS IMBALANCED; EXPECTED FUEL AT DE (N865NN)
- [SDR AALA202603062089](https://openairdocs.org/sdr/AALA202603062089), Jan 21, 2026: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AT CRUISE NOTICED ENGINE #1 WAS IMBALANCED; EXPECTED FUEL AT DE (N865NN)
- [SDR AALA202603066997](https://openairdocs.org/sdr/AALA202603066997), Jan 21, 2026: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AT CRUISE NOTICED ENGINE #1 WAS IMBALANCED; EXPECTED FUEL AT DE (N865NN)
- [SDR AALA202601070159](https://openairdocs.org/sdr/AALA202601070159), Jan 6, 2026: Boeing 737823. PRESSURE SWITCH. FAULTY. AIRCRAFT WAS GROUNDED: IN FLIGHT WHEN BALANCING FUEL THE RIGHT AFT MAIN FUEL PUMP LOW PRESSURE LIGHT DOES NOT ILLUMINATE (N820NN)
- [SDR AALA202603066554](https://openairdocs.org/sdr/AALA202603066554), Dec 16, 2025: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS NOT GROUNDED: 1500LB FUEL IMBALANCE (RIGHT TANK LOW) AFTER TAKEOFF WITH FUEL IN THE CENTER TANK AND CENTER  (N952NN)
- [SDR AALA202603063071](https://openairdocs.org/sdr/AALA202603063071), Dec 16, 2025: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS NOT GROUNDED: 1500LB FUEL IMBALANCE (RIGHT TANK LOW) AFTER TAKEOFF WITH FUEL IN THE CENTER TANK AND CENTER  (N952NN)
- [SDR AALA202603069689](https://openairdocs.org/sdr/AALA202603069689), Dec 16, 2025: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS NOT GROUNDED: 1500LB FUEL IMBALANCE (RIGHT TANK LOW) AFTER TAKEOFF WITH FUEL IN THE CENTER TANK AND CENTER  (N952NN)
- [SDR AALA202603061448](https://openairdocs.org/sdr/AALA202603061448), Dec 16, 2025: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS NOT GROUNDED: 1500LB FUEL IMBALANCE (RIGHT TANK LOW) AFTER TAKEOFF WITH FUEL IN THE CENTER TANK AND CENTER  (N952NN)
- [SDR AALA202603065061](https://openairdocs.org/sdr/AALA202603065061), Dec 16, 2025: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS NOT GROUNDED: 1500LB FUEL IMBALANCE (RIGHT TANK LOW) AFTER TAKEOFF WITH FUEL IN THE CENTER TANK AND CENTER  (N952NN)
- [SDR AALA202603064734](https://openairdocs.org/sdr/AALA202603064734), Dec 16, 2025: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS NOT GROUNDED: 1500LB FUEL IMBALANCE (RIGHT TANK LOW) AFTER TAKEOFF WITH FUEL IN THE CENTER TANK AND CENTER  (N952NN)
- [SDR AALA202603065951](https://openairdocs.org/sdr/AALA202603065951), Dec 16, 2025: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS NOT GROUNDED: 1500LB FUEL IMBALANCE (RIGHT TANK LOW) AFTER TAKEOFF WITH FUEL IN THE CENTER TANK AND CENTER  (N952NN)
- [SDR AALA202603063263](https://openairdocs.org/sdr/AALA202603063263), Dec 16, 2025: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS NOT GROUNDED: 1500LB FUEL IMBALANCE (RIGHT TANK LOW) AFTER TAKEOFF WITH FUEL IN THE CENTER TANK AND CENTER  (N952NN)
- [SDR AALA202603067347](https://openairdocs.org/sdr/AALA202603067347), Dec 16, 2025: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS NOT GROUNDED: 1500LB FUEL IMBALANCE (RIGHT TANK LOW) AFTER TAKEOFF WITH FUEL IN THE CENTER TANK AND CENTER  (N952NN)
- [SDR AALA202603069474](https://openairdocs.org/sdr/AALA202603069474), Dec 16, 2025: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS NOT GROUNDED: 1500LB FUEL IMBALANCE (RIGHT TANK LOW) AFTER TAKEOFF WITH FUEL IN THE CENTER TANK AND CENTER  (N952NN)
- [SDR AALA202603068293](https://openairdocs.org/sdr/AALA202603068293), Dec 16, 2025: Boeing 737823. PROBE. FAULTED. AIRCRAFT WAS NOT GROUNDED: 1500LB FUEL IMBALANCE (RIGHT TANK LOW) AFTER TAKEOFF WITH FUEL IN THE CENTER TANK AND CENTER  (N952NN)
- [SDR AALA202601068333](https://openairdocs.org/sdr/AALA202601068333), Dec 15, 2025: Boeing 737823. PRESSURE SWITCH. FAULTY. AIRCRAFT WAS NOT GROUNDED: TANK 1 AFT FUEL LOW PRESSURE LIGHT DOES NOT ILLUMINATE WHEN THE FUEL PUMP SWITCH IS TURNED OF (N957AN)
- [SDR AALA202601060573](https://openairdocs.org/sdr/AALA202601060573), Dec 12, 2025: Boeing 737823. PUMP. FAULTY. AIRCRAFT WAS NOT GROUNDED: NUMBER 2 AFT FUEL PUMP ANNUNCIATING LOW PRESSURE IN CRUISE WITH 5,700LBS IN TANK. NOT MAKING  (N908NN)
- [SDR AALA202509021661](https://openairdocs.org/sdr/AALA202509021661), Aug 30, 2025: Boeing 737823. PRESSURE SWITCH. INOPERATIVE. AIRCRAFT WAS GROUNDED: NUMBER 2 AFT FUEL PUMP IS TURNED OFF, LOW PRESSURE LIGHT DOES NOT ILLUMINATE. REMOVED AND REPLACE (N898NN)
- [SDR AALA202502067323](https://openairdocs.org/sdr/AALA202502067323), Feb 4, 2025: Boeing 737823. PRESSURE SWITCH. INOPERATIVE. AIRCRAFT WAS NOT GROUNDED: RIGHT AFT FUEL LOW PRESSURE LIGHT NOT WORKING WITH PUMP OFF. REMOVED AND REPLACED RIGHT AFT F (N834NN)
- [SDR AALA202404013680](https://openairdocs.org/sdr/AALA202404013680), Mar 28, 2024: Boeing 737823. FLOAT VALVE. CRACKED. AIRCRAFT WAS GROUNDED: ON CLIMBING OUT GOT AN AMBER FUEL IMBALANCE. FOUND LEFT TANK VENT FLOAT VALVE CRACKED, REPLACED A (N832NN)
- [SDR HALA20240313065](https://openairdocs.org/sdr/HALA20240313065), Mar 12, 2024: Airbus A321271N. PROBE. FAULTED. ETOPS - 1600LBS OF FUEL DISSAPEARED FROM FOB BEFORE PUSHBACK. REMOVED AND REPLACED RH WING FUEL PROBES 27QT2 AND 28QT2 P (N215HA)
- [SDR AALA202402287617](https://openairdocs.org/sdr/AALA202402287617), Feb 19, 2024: Boeing 737823. PROBE. FAULTY. AIRCRAFT WAS GROUNDED: FUEL IMBALANCE. REPLACED RIGHT WING TANK FUEL COMPENSATOR (AALA202402206078) AND 7 FUEL PROBES (A (N957NN)
- [SDR AALA202402287952](https://openairdocs.org/sdr/AALA202402287952), Feb 19, 2024: Boeing 737823. PROBE. FAULTY. AIRCRAFT WAS GROUNDED: FUEL IMBALANCE. REPLACED RIGHT WING TANK FUEL COMPENSATOR (AALA202402206078) AND 7 FUEL PROBES (A (N957NN)
- [SDR AALA202402281578](https://openairdocs.org/sdr/AALA202402281578), Feb 19, 2024: Boeing 737823. PROBE. FAULTY. AIRCRAFT WAS GROUNDED: FUEL IMBALANCE. **SUPPLEMENTAL REPORT FOR AALA202402206078: REPLACED RIGHT WING TANK FUEL COMPENS (N957NN)
- [SDR AALA202402288867](https://openairdocs.org/sdr/AALA202402288867), Feb 19, 2024: Boeing 737823. PROBE. FAULTY. AIRCRAFT WAS GROUNDED: FUEL IMBALANCE. REPLACED RIGHT WING TANK FUEL COMPENSATOR (AALA202402206078) AND 7 FUEL PROBES (A (N957NN)
- [SDR AALA202402282995](https://openairdocs.org/sdr/AALA202402282995), Feb 19, 2024: Boeing 737823. PROBE. FAULTY. AIRCRAFT WAS GROUNDED: FUEL IMBALANCE. REPLACED RIGHT WING TANK FUEL COMPENSATOR (AALA202402206078) AND 7 FUEL PROBES (A (N957NN)
- [SDR AALA202402288523](https://openairdocs.org/sdr/AALA202402288523), Feb 19, 2024: Boeing 737823. PROBE. FAULTY. AIRCRAFT WAS GROUNDED: FUEL IMBALANCE. REPLACED RIGHT WING TANK FUEL COMPENSATOR (AALA202402206078) AND 7 FUEL PROBES (A (N957NN)
- [SDR AALA202402288382](https://openairdocs.org/sdr/AALA202402288382), Feb 19, 2024: Boeing 737823. PROBE. FAULTY. AIRCRAFT WAS GROUNDED: FUEL IMBALANCE. REPLACED RIGHT WING TANK FUEL COMPENSATOR (AALA202402206078) AND 7 FUEL PROBES (A (N957NN)
- [SDR AALA202301238541](https://openairdocs.org/sdr/AALA202301238541), Jan 20, 2023: Boeing 737823. COMPENSATOR. FALSE INDICATION. AIRCRAFT WAS GROUNDED: SUSPECTED FUEL LEAK FROM LEFT MAIN TANK IN FLIGHT. LEFT TANK INDICATION DROPPING AT A HIGHER RATE (N937AN)
- [SDR 2022FA0000437](https://openairdocs.org/sdr/2022FA0000437), Aug 8, 2022: Cessna 150F. TRANSMITTER. DEFECTIVE. TEST, TEST, TEST - AC LANDED SHORT OF RUNWAY AFTER ENGINE QUIT. AC HAD SUBSTANTIAL DAMAGE NO INJURIES. DETERMINED AC RAN (N8057F)
- [SDR 9JLA2022107121998](https://openairdocs.org/sdr/9JLA2022107121998), Jul 7, 2022: Amd FALCON900EX. PROBE. FAILED. THE FLIGHT CREW REPORTED THAT THE LEFT WING OUTBOARD FUEL PROBE FAILED CAUSING THE FLIGHT TO BE CANCELLED. THE MAINTENAN (N512KS)
- [SDR AALA202206084868](https://openairdocs.org/sdr/AALA202206084868), Jun 4, 2022: Airbus A319112. NONE. NONE. AIRCRAFT WAS NOT GROUNDED: FUEL AUTO FEED FAULT IN FLIGHT, FOLLOWED ECAM PROCEDURES. MAINTENANCE REPLACED REPLACED THE F (N732US)
- [SDR WX0A1900010074080](https://openairdocs.org/sdr/WX0A1900010074080), May 2, 2022: Airbus A319111. NONE. NONE. ON DESCENT, ""FUEL F.USED/ FOB DISAGREE"" DISPLAYED. QRH PROCEDURE ACCOMPLLISHED./REF TI AIRBUS 28.42.00.043 ACCOMPLLISH (N323NV)
- [SDR I5PA2022032592202](https://openairdocs.org/sdr/I5PA2022032592202), Mar 25, 2022: Boeing 757260PF. PRESSURE SWITCH. FAULTY. RIGHT AFT FUEL PUMP PRESSURE LIGHT ILLUMINATED... REPLACED FUEL PRESS. SWITCH. (N922TS)
- [SDR P5CA2022021500040](https://openairdocs.org/sdr/P5CA2022021500040), Feb 12, 2022: Boeing 74787UF. SWITCH. NONE. DURING T/O ROLL: EICAS MSG "FUEL PRESS ENG 2"(<P ><SPAN>&NBSP;</SPAN><SPAN>REMOVED AND REPLACED #2 FWD BOOST PUMP PRESSU (N852GT)
- [SDR YV3R2022021000516](https://openairdocs.org/sdr/YV3R2022021000516), Jan 25, 2022: Robsin R22. NONE. NONE. CUSTOMER REPORTED FUEL SENDER (LEVEL) P/N: D252-1 CAUSED ERRATIC READINGS ON GAUGE ASSEMBLY. (N988DC)
- [SDR HALA2022010300001](https://openairdocs.org/sdr/HALA2022010300001), Jan 1, 2022: Airbus A330243. COMPUTER. INOPERATIVE. ETOPS - IN CRUISE- RT MAIN FUEL TANK INDICATED 9,000 LB LOW. 15 MINS LATER IT CORRECTED TO ACTUAL FUEL LOAD. FF INDICATE (N375HA)
- [SDR ANCF20211125001](https://openairdocs.org/sdr/ANCF20211125001), Nov 23, 2021: Airbus A320214. NONE. NONE. 23-NOV.21 PILOT REPORT WO 16538464 => DURING CLIMB PASSING FL270 AND ABOUT 20 MINUTES AFTER DEPARTURE THE FOB INDICATION (N740AV)
- [SDR AALA202111179930](https://openairdocs.org/sdr/AALA202111179930), Nov 16, 2021: Boeing 737*. PROCESSOR. INOPERATIVE. AIRCRAFT WAS GROUNDED: DURING CLIMB LEFT FUEL DISPLAY BLANKED, LEVELED AT FL230. LEFT DISPLAY RETURNED WITH LARGE IMBALA (N971AN)
- [SDR AALA202111177075](https://openairdocs.org/sdr/AALA202111177075), Nov 16, 2021: Boeing 737*. PROBE. INOPERATIVE. AIRCRAFT WAS GROUNDED: DURING CLIMB LEFT FUEL DISPLAY BLANKED, LEVELED AT FL230. LEFT DISPLAY RETURNED WITH LARGE IMBALA (N971AN)
- [SDR UIEA2021110402346](https://openairdocs.org/sdr/UIEA2021110402346), Nov 3, 2021: Boeing 767306. SWITCH. NONE. LH AFT FUEL PUMP OVERHEAD SWITH INOP / ( FUEL PUMP LOW PRESS LIGHTS, -200/-300 )(<P>TRANSFERRED TO MDDR 156172 PER DDG 2 (N1427A)
- [SDR UIEA2021091602033](https://openairdocs.org/sdr/UIEA2021091602033), Sep 15, 2021: Boeing 76738E. PUMP. FALSE INDICATION. LEFT FWD FUEL PUMP EICAS.(<P>PERFORMED OPS CK OF LT FWD FUEL PUMP ALL CHECKS OK NO MSG OR FAULTS PER AMM 28-42-01</P>) (N641GT)
- [SDR 9JLA2021081618593](https://openairdocs.org/sdr/9JLA2021081618593), Aug 11, 2021: Cessna 680SOV. PROBE. DEFECTIVE. FLIGHT CREW REPORTED THAT THE RIGHT FUEL QUANTITY INDICATOR SHOWS DASHES WHILE AT ALTITUDE. RESULTS IN TOTAL FUEL QUANTI (N630DV)

All 544: https://openairdocs.org/jasc/2842/reports.md

## Other codes in chapter 28

- [JASC 2800](https://openairdocs.org/jasc/2800): Aircraft Fuel System (740 reports)
- [JASC 2810](https://openairdocs.org/jasc/2810): Fuel Storage (3,516 reports)
- [JASC 2820](https://openairdocs.org/jasc/2820): Aircraft Fuel Distribution System (3,627 reports)
- [JASC 2821](https://openairdocs.org/jasc/2821): Aircraft Fuel Filter/Strainer (366 reports)
- [JASC 2822](https://openairdocs.org/jasc/2822): Fuel Boost Pump (2,745 reports)
- [JASC 2823](https://openairdocs.org/jasc/2823): Fuel Selector/Shut-Off Valve (423 reports)
- [JASC 2824](https://openairdocs.org/jasc/2824): Fuel Transfer Valve (572 reports)
- [JASC 2830](https://openairdocs.org/jasc/2830): Fuel Dump System (125 reports)
- [JASC 2840](https://openairdocs.org/jasc/2840): Fuel Indicating System (1,863 reports)
- [JASC 2841](https://openairdocs.org/jasc/2841): Fuel Quantity Indicator (1,152 reports)
- [JASC 2843](https://openairdocs.org/jasc/2843): Fuel Temperature Indicator (24 reports)
- [JASC 2844](https://openairdocs.org/jasc/2844): Fuel Pressure Indicator (272 reports)
- [JASC 2897](https://openairdocs.org/jasc/2897): Fuel System Wiring (656 reports)

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