# JASC 2840: Fuel Indicating System

- Type: JASC system/component code (FAA)
- ATA chapter: 28 Fuel
- Title in the code table: ACFT FUEL INDICATING SYSTEM
- Service difficulty reports: 1,862
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=28
- Page: https://openairdocs.org/jasc/2840

## What it covers

For general reports pertaining to the aircraft fuel indicating systems, but with no specific reference to the transmitter (tank unit) or indicator. Does not include engine fuel pressure reports, which are filed in JASC code 7332, or flow indication system in JASC code 7331. Typical parts are circuit breaker, connector, pressure switch, indicator lights, dripstick, etc.

## Service difficulty reports (1,862, newest 50)

- [SDR ANCF20260929019](https://openairdocs.org/sdr/ANCF20260929019), Sep 29, 2026: Airbus A320214. SENSOR. ABNORMAL. FUEL F. USED / FOB DISAGREE, THE CADENSICON 19QT HAS BEEN REMOVED AND REPLACED IAW AMM 28-42-16-000/400-001-A REV 78 REV (N632AV)
- [SDR SWAA2026092514349](https://openairdocs.org/sdr/SWAA2026092514349), Sep 21, 2026: Boeing 7377H4. FUEL SYS. FAULTED. DURING CRUISE, NR 2 FUEL GAUGE PROGRESSED TO 400 LBS MORE THAN NR 1 TANK WITH CONSISTENTLY SLIGHTLY HIGHER FUEL FLOW. CR (N473WN)
- [SDR UIEA2026091200875](https://openairdocs.org/sdr/UIEA2026091200875), Sep 10, 2026: Boeing 76738E. PROBE. FAULTED. DURING CRUISE FLIGHT WITH CENTER TANK PUMPS OPERATIONS, RIGHT MAIN TANK AND LEFT TANK FUEL IMBALANCE INCREASED TO 8000 L (N641GT)
- [SDR DALA2026091305109](https://openairdocs.org/sdr/DALA2026091305109), Sep 10, 2026: Airbus A320212. WARNING MESSAGE. ILLUMINATED. CAUTION ON ECAM - TK LO TEMP LEFT OUTTER LO TEMP. FLIGHT CREW PLACARD VALIDATION IS ACCOMPLISHED REJECTED TAKEOFF DUE TO (N351NW)
- [SDR SIMA20260907001](https://openairdocs.org/sdr/SIMA20260907001), Sep 7, 2026: Emb ERJ170200LR. FCU. ILLUMINATED. FUEL 1 LO LEVEL EICAS MESSAGE AFTER TAKEOFF. (EMERGENCY DECLARED). DEFERRED FUEL 1 LOW LEVEL SENSOR MEL AUTH# 090367-C R (N311VE)
- [SDR 6CBA2026083126001](https://openairdocs.org/sdr/6CBA2026083126001), Aug 29, 2026: Pilats PC1247E. WARNING LIGHT. ILLUMINATED. DURING FLIGHT FROM KLAL TO KLZU, THE CREW RECEIVED A LH FUEL QTY FAIL CAS, AND AN ASSOCIATED FUEL IMBALANCE CAS APPEARED (N755AF)
- [SDR AALA202608315612](https://openairdocs.org/sdr/AALA202608315612), Aug 27, 2026: Airbus A321211. COMPUTER. DEFECTIVE. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO LAX DUE TO THE FLIGHT CREW REPORTING AN EC (N179UW)
- [SDR DALA2026082404778](https://openairdocs.org/sdr/DALA2026082404778), Aug 23, 2026: Airbus A320212. INDICATION SYS. INOPERATIVE. ATB - DUE TO FUEL QTY IMBALANCE, RIGHT INBOARD TANK READ 1,200 LBS HIGHER THAN LEFT INBOARD TANK. REPLACED FQIC. (LP: 88 (N363NW)
- [SDR G41A2026081900656](https://openairdocs.org/sdr/G41A2026081900656), Aug 16, 2026: Lear 60LEAR. FUEL SYS. MALFUNCTIONED. DEPARTED KGSO HEADING TO KHDC. APPROXIMATELY 1 HOUR INTO THE FLIGHT, THE CAPTAIN REPORTED A FUEL QUANTITY ISSUE. FOR SAF (N198HB)
- [SDR AALA202608101074](https://openairdocs.org/sdr/AALA202608101074), Aug 9, 2026: Airbus A321253N. VALVE. DEFECTIVE. AIRCRAFT WAS GROUNDED: FLIGHT CREW REPORTED THAT AT FL 360 THERE WAS A FUEL IMBALANCE OF 3000 THOUSAND POUNDS DIFFERENCE (N951XV)
- [SDR AALA202608104486](https://openairdocs.org/sdr/AALA202608104486), Aug 6, 2026: Boeing 777223. PROCESSOR. FAULTY. AIRCRAFT WAS GROUNDED: AIRCRAFT WAS GROUNDED: LEFT MAIN TANK AND TOTAL FUEL QUANTITY BLANK. DECESION MADE TO RETURN TO D (N776AN)
- [SDR AALA202608102093](https://openairdocs.org/sdr/AALA202608102093), Aug 6, 2026: Boeing 777223. PROCESSOR. FAULTY. AIRCRAFT WAS GROUNDED: LEFT MAIN TANK AND TOTAL FUEL QUANTITY BLANK. DECESION MADE TO RETURN TO DFW. EMERGENCY DECLARED  (N776AN)
- [SDR SWAA2026072957039](https://openairdocs.org/sdr/SWAA2026072957039), Jul 25, 2026: Boeing 7378. FLOAT SWITCH. LEAKING. RIGHT WING LEAKING FUEL FROM OUT BOARD VENT RIGHT WING FLOAT SWITCH OK TO CONTINUE PER MEL 28-21-01A SP#1 & SP#1B REMOVE (N8851Q)
- [SDR FDEA202607180943](https://openairdocs.org/sdr/FDEA202607180943), Jul 18, 2026: Boeing 7673S2F. WARNING MESSAGE. FALSE ACTIVATION. TOOK OFF WITH 2.3 IN CENTER TANKS, L & R TANKS FULL. ALL PUMPS ON AND CROSS FEEDS WERE OFF. APPROX 10 MINS INTO FLIGHT,  (N160FE)
- [SDR AALA202607072190](https://openairdocs.org/sdr/AALA202607072190), Jul 6, 2026: Boeing 737823. RELAY. FAULTED. AIRCRAFT WAS GROUNDED: LEFT CENTER TANK LOW PRESSURE LIGHT ILLUMINATED AND STAYED ON. PERFORMED T/S IAW FIM 28-22-00-810 (N906AN)
- [SDR CNMA2026060001](https://openairdocs.org/sdr/CNMA2026060001), Jun 21, 2026: Boeing 7772U8. INDICATION SYS. INTERMITTENT. DURING CLIMB FUEL IMBALANCE CK LIST CAME UP. EVENTUALLY RT SIDE SHOWED 8K LEFT SIDE SHOWED 35K DURING DESCENT IT WENT BA (N828AX)
- [SDR AALA202606253429](https://openairdocs.org/sdr/AALA202606253429), Jun 18, 2026: Boeing 737823. COMPENSATOR. ERRATIC. AIRCRAFT WAS GROUNDED: DIVERTING TO DFW ON ACCOUNT OF MAINTENANCE. FUEL INDICATION. EMERGENCY NOT DECLARED AND AIRCRAFT  (N880NN)
- [SDR MTNA2026061500002](https://openairdocs.org/sdr/MTNA2026061500002), Jun 12, 2026: Textrn 408. PROBE. FALSE INDICATION. ON JUNE 12, 2026, DURING DESCENT ON FLIGHT MTN8380 FROM MEM TO DHN, 714FX, EXPERIENCED INTERMITTENT FUEL LEVEL LO R AND  (N714FX)
- [SDR AALA202606031763](https://openairdocs.org/sdr/AALA202606031763), Jun 2, 2026: Airbus A319115. WARNING MESSAGE. ILLUMINATED. AIRCRAFT WAS NOT GROUNDED: AN EMERGENCY WAS DECLARED UPON ARRIVAL IN DFW DUE TO THE FLIGHT CREW REPORTING AN FUEL USED / (N9016)
- [SDR DXTA2026052608191](https://openairdocs.org/sdr/DXTA2026052608191), May 21, 2026: Bombdr BD7001A11. INDICATION SYS. MALFUNCTIONED. LEFT WING FUEL QUANTITY WILL RAPIDLY INCREASE IN INDICATED AMOUNT. THIS LARGE INCREASE CREATES A FUEL IMBALANCE AMBER CA (N122QS)
- [SDR SIMA20260520001](https://openairdocs.org/sdr/SIMA20260520001), May 20, 2026: Emb ERJ170200LR. SIGNAL COND UNIT. FAILED. FUEL 1 LO LEVEL SHORTLY AFTER TAKE OFF. COMPLIED WITH QRH FOR PROCEDURE AND CROSS-CHECKED MEL 28-20 TO ENSURE IT WAS NOT (N266NN)
- [SDR MTNA2026051900001](https://openairdocs.org/sdr/MTNA2026051900001), May 19, 2026: Textrn 408. PROBE. FALSE INDICATION. WHEN N743FX LANDED IN MCO LAST NIGHT WITH THE LOW FUEL LIGHT ON, WHEN THE PIC WAS PULLING INTO PARK, THEY HAD APPROXIMAT (N743FX)
- [SDR AALA202604305017](https://openairdocs.org/sdr/AALA202604305017), Apr 29, 2026: Airbus A321231. TRANSMITTER. FAULTED. AIRCRAFT WAS GROUNDED: THE AIRCRAFT DIVERTED TO DEN DUE TO THE FLIGHT CREW REPORTING A FUEL USED /FUEL ON BOARD DISAGREE (N102NN)
- [SDR MTNA2026061500001](https://openairdocs.org/sdr/MTNA2026061500001), Apr 23, 2026: Textrn 408. PROBE. FALSE INDICATION. DURING MTNA'S 800 HR INSPECTION ON 758FX IT WAS IDENTIFIED THAT: LEFT FUEL QTY FOUND TO BE INACURATE, WITH EMPTY LEFT SI (N758FX)
- [SDR SWAA2026042789576](https://openairdocs.org/sdr/SWAA2026042789576), Apr 14, 2026: Boeing 7378. FLOAT SWITCH. FAILED. RIGHT MAIN TANK FUEL LEAK DUE TO POSSIBLE FAILED VALVE. RIGHT WING FLOAT SWITCH INOPERATIVE, OK TO CONT IAW MEL 28-21-01 (N8756S)
- [SDR YENA2026041500397](https://openairdocs.org/sdr/YENA2026041500397), Apr 14, 2026: Airbus A321271NX. SELECTOR. FAILED. FLT#34, CDG-BOS. (ETOPS) "AIRCARFT WAS OVERFUELED IN CDG. NO FAULTS PRESENT AT THE TIME, ON SHUTDOWN , MAINTENANCE POST  (N4083J)
- [SDR AALA202604148914](https://openairdocs.org/sdr/AALA202604148914), Apr 7, 2026: Boeing 737823. PRESSURE SWITCH. INOPERATIVE. AIRCRAFT WAS NOT GROUNDED: RIGHT CENTER TANK LOW PRESSURE LIGHT ON WITH PUMP ON AND FUEL INSIDE THE TANK. REMOVED AND RE (N945AN)
- [SDR QXEA2026040700078](https://openairdocs.org/sdr/QXEA2026040700078), Mar 31, 2026: Emb ERJ170200LR. FAULT MESSAGE. ILLUMINATED. FUEL 2 FEED FAULT MESSAGE DISPLAYED ON EICAS ON TAKE OFF ROLL. REJECTED TAKEOFF. REMOVED FROM SERVICE. INFO ONLY, RESET  (N663QX)
- [SDR 2026FA0000232](https://openairdocs.org/sdr/2026FA0000232), Mar 27, 2026: Airbus A320214. INDICATION SYS. FAULTED. DURING TAXI AOUT FUEL IN LEFT OUTER TANK INCREASED TO 590KG AND FUEL IN LEFT INNER TANK DECREASED TO 1340 KG FUEL IS LOA (N281AV)
- [SDR CALA2026032714869](https://openairdocs.org/sdr/CALA2026032714869), Mar 25, 2026: Boeing 737924ER. PROBE. FAULTY. CREW REPORTED #2 TANK DROPPED 500 LBS MORE THAT #1 TANK IN A 9 MINUTE TIME LINE CREATING A SECOND INBALANCE CONDITIONACP (N39416)
- [SDR AALA202603196313](https://openairdocs.org/sdr/AALA202603196313), Mar 18, 2026: Boeing 737823. PRESSURE SWITCH. FAULTY. AIRCRAFT WAS GROUNDED: RIGHT AFT FUEL BOOST PUMP LOW PRESSURE LIGHT WILL NOT EXTINGUISH WITH PUMP SWITCH TURNED ON. REEM (N929NN)
- [SDR QR9R2026031200001](https://openairdocs.org/sdr/QR9R2026031200001), Mar 12, 2026: Bolkms BK117C2. SENSOR. FAULTED. WHILE ON FINAL, FUEL QUANTITY DEGRADE CAUTION MESSAGE APPEARED ON DASH WITH SUBSEQUENT LOSS OF FUEL QUANTITY INDICATIONS
- [SDR 3EJA868JS030326](https://openairdocs.org/sdr/3EJA868JS030326), Mar 3, 2026: Cessna 560XL. PRESSURE SWITCH. FAILED. ON THE TAKEOFF ROLL PRIOR TO 80, THE R LO FUEL PRESS ILLUMINATED FOLLOWED IMMEDIATELY BY R FUEL BOOST LIGHT. (N868JS)
- [SDR YENA2026022700240](https://openairdocs.org/sdr/YENA2026022700240), Feb 26, 2026: Airbus A321271NX. CONTROL UNIT. FAULTED. FLT 20, LHR-JFK (ETOPS). CLASS II MAINTENANCE MSG FUEL ( CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF  (N4058J)
- [SDR AALA202602235876](https://openairdocs.org/sdr/AALA202602235876), Feb 22, 2026: Boeing 737823. FUEL SYS. WARNING MESSAGE. AIRCRAFT WAS GROUNDED: DURNING DESCENT RECEIVED A FUEL IMBALANCE AND CONFIGURATION WARNING; AFTER CENTER TANK WAS EMPTY. (N927AN)
- [SDR AALA202602233269](https://openairdocs.org/sdr/AALA202602233269), Feb 20, 2026: Boeing 737823. PRESSURE SWITCH. FAULTY. AIRCRAFT WAS GROUNDED: WHEN CENTER FUEL TANK WAS EMPTY LEFT CENTER LOW PRESSURE LIGHT AND ASSOCIATED CAUTION DID NOT ILL (N923AN)
- [SDR YENA2026020200106](https://openairdocs.org/sdr/YENA2026020200106), Feb 1, 2026: Airbus A321271NX. WARNING MESSAGE. FALSE ACTIVATION. FLT 133, BOS - SFO, (ETOPS). CLASS II FUEL, CLASS II MAINTENANCE MESSAGES DISPLAYED ON ECAM STATUS PAGE OF ECAM SYSTEM D (N2169J)
- [SDR AALA202603060600](https://openairdocs.org/sdr/AALA202603060600), 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 AALA202603066245](https://openairdocs.org/sdr/AALA202603066245), Jan 21, 2026: Boeing 737823. COMPENSATOR. FAULTED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AT CRUISE NOTICED ENGINE #1 WAS IMBALANCED; EXPECTED FUEL AT DE (N865NN)
- [SDR AALA202603068764](https://openairdocs.org/sdr/AALA202603068764), Jan 21, 2026: Boeing 737823. TRANSMITTER. FAULTED. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: AT CRUISE NOTICED ENGINE #1 WAS IMBALANCED; EXPECTED FUEL AT DE (N865NN)
- [SDR AALA202601156533](https://openairdocs.org/sdr/AALA202601156533), Jan 10, 2026: Boeing 737823. INDICATOR. FAULTY. AIRCRAFT WAS GROUNDED: LEFT CENTER FUEL PUMP LOW PRESSURE LIGHT ILLUMINATED IN FLIGHT AND STAYED ON WITH FUEL IN CENTER  (N954AN)
- [SDR AALA202601094879](https://openairdocs.org/sdr/AALA202601094879), Jan 8, 2026: Boeing 737823. PROCESSOR. FALSE INDICATION. AIRCRAFT WAS GROUNDED: LEFT FUEL TANK INDICATOR PERIODICALLY SHOWS A QUANTITY VALUE IT FLAGS A FUEL IMBALANCE AND MULTIP (N964NN)
- [SDR SWI2026F00000](https://openairdocs.org/sdr/SWI2026F00000), Dec 30, 2025: Emb ERJ170200LR. WARNING MESSAGE. ILLUMINATED. FUEL 1 LO LEVEL WARNING MESSAGE DURING FLIGHT. QRH COMPLIED WITH AND DIVERSION REQUIRED. (FLIGHT 3102) OPEN. (N176SY)
- [SDR SWI2025F01869](https://openairdocs.org/sdr/SWI2025F01869), Dec 23, 2025: Emb ERJ170200LR. WARNING MESSAGE. ILLUMINATED. FLIGHT CREW REPORTS FUEL 2 LOW LEVEL MESSAGE DISPLAYED IN FLIGHT. (FLIGHT 3102 - FILED OPEN)THIS IS CURRENTLY A WORK IN  (N185SY)
- [SDR AALA202603069117](https://openairdocs.org/sdr/AALA202603069117), Dec 16, 2025: Boeing 737823. COMPENSATOR. FAILED. AIRCRAFT WAS NOT GROUNDED: 1500LB FUEL IMBALANCE (RIGHT TANK LOW) AFTER TAKEOFF WITH FUEL IN THE CENTER TANK AND CENTER  (N952NN)
- [SDR YENA2025121701227](https://openairdocs.org/sdr/YENA2025121701227), Dec 15, 2025: Airbus A321271NX. COMPUTER. FAULTED. FLT 2233 BOS-SFO ( ETOPS). FUEL ACT XFR FAULT QRH APPLIED WITH FUEL IN AFT 1; REMOVED AND REPLACED FQIC (3QT) AS PRECAUT (N2165J)
- [SDR AALA202512181754](https://openairdocs.org/sdr/AALA202512181754), Dec 14, 2025: Airbus A321231. SENSOR. FAULTED. AIRCRAFT WAS GROUNDED: FUEL RIGHT WING TANK OVERFLOW ECAM ALERT. FLIGHT CREW SUCCESSFULLY RAN ECAM WITH CENTER TANK RIGH (N560UW)
- [SDR AALA202512188656](https://openairdocs.org/sdr/AALA202512188656), Dec 14, 2025: Airbus A321231. SENSOR. FAULTED. AIRCRAFT WAS GROUNDED: FUEL RIGHT WING TANK OVERFLOW ECAM ALERT. FLIGHT CREW SUCCESSFULLY RAN ECAM WITH CENTER TANK RIGH (N560UW)
- [SDR AALA202512188968](https://openairdocs.org/sdr/AALA202512188968), Dec 14, 2025: Airbus A321231. SENSOR. FAULT MESSAGE. AIRCRAFT WAS GROUNDED: FUEL RIGHT WING TANK OVERFLOW ECAM ALERT. FLIGHT CREW SUCCESSFULLY RAN ECAM WITH CENTER TANK RIGH (N560UW)
- [SDR AALA202512150193](https://openairdocs.org/sdr/AALA202512150193), Dec 12, 2025: Airbus A321231. CONTROL UNIT. FAULTED. AIRCRAFT WAS GROUNDED: FLIGHT CREW REPORTED FUEL LEFT WING TANK OVERFLOW ECAM ON DESCENT THROUGH 10,000 FT. MAINTENANCE  (N130AN)

All 1,862: https://openairdocs.org/jasc/2840/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 (3,514 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 2841](https://openairdocs.org/jasc/2841): Fuel Quantity Indicator (1,152 reports)
- [JASC 2842](https://openairdocs.org/jasc/2842): Fuel Quantity Sensor (544 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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