# JASC 7330: Engine Fuel Indicating System

- Type: JASC system/component code (FAA)
- ATA chapter: 73 Engine Fuel and Control
- Title in the code table: ENGINE FUEL INDICATING SYSTEM
- Service difficulty reports: 407
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=63
- Page: https://openairdocs.org/jasc/7330

## What it covers

For reports of fuel temperature, flow rate, or pressure indicating and warning systems other than the indicators, sensors, and transmitters. Typical parts are line, hose, lamp, bulb, wiring harness, circuit breaker, etc.

## Service difficulty reports (407, newest 50)

- [SDR HNAA2026021000114](https://openairdocs.org/sdr/HNAA2026021000114), Feb 9, 2026: Emb EMB145LR. WARNING MESSAGE. FALSE ACTIVATION. ON TAKE OFF ROLL 75 KNOTS, NR 1 ENGINE FUEL LOW TEMP. PERFORMED CONTINUITY & RESISTANCE TESTS ON ENGINE HARNESS W9 IAW R (N690AE)
- [SDR YENA2026020900157](https://openairdocs.org/sdr/YENA2026020900157), Feb 8, 2026: Airbus A321271NX. PUMP. FAILED. FLT # 2233 BOS- SFO (ETOPS). " #1 ENG HEAT SYS DEGRADE ( HEAT SYS DEGRAD CAUTIONS ON ECAM E/WD ).; REMOVED AND REPLACED  (N2142J)
- [SDR YENA2025122201240](https://openairdocs.org/sdr/YENA2025122201240), Dec 22, 2025: Airbus A321271NX. PUMP. FAILED. FLT # 700 LAX- FLL (ETOPS) " ENG 1 HEAT SYS DEGRADED ECAM MESSAGE AFTER LANDING CLEARED ON ENGINE SHUTDOWN (HEAT SYS DEG (N2156J)
- [SDR YENA2025120901183](https://openairdocs.org/sdr/YENA2025120901183), Dec 6, 2025: Airbus A321271NX. FUEL HEATER. FAILED. FLT#724, LAX-JFK. (ETOPS), ENG 1 HEAT SYS DEGRADED ON LANDING WENT AWAY ON ENG SHUTDOWN ( HEAT SYS DEGRAD CAUTIONS ON EC (N2169J)
- [SDR QR9R2025112000002](https://openairdocs.org/sdr/QR9R2025112000002), Nov 20, 2025: Bolkms BK117C2. PRESSURE SWITCH. DISPLAYED. FUEL PRESSURE CAUTION MESSAGE DISPLAYED ENG 1 ON CAD AFTER .7 OF FLIGHT TIME. PRIME PUMP WAS PLACED ON AND MESSAGE REMAI
- [SDR CALA2025082208057](https://openairdocs.org/sdr/CALA2025082208057), Aug 20, 2025: Boeing 767322. PRESSURE SWITCH. CONTAMINATED. L ENG FUEL FILTER EICAS PASSING 2000 FEET AGL SENT FRM CODE CAME BACK AS SOMETHING ELSE CB'S P11-D25 AND P6-E1 PULLED AN (N643UA)
- [SDR QR9R2025070200002](https://openairdocs.org/sdr/QR9R2025070200002), Jul 2, 2025: Bolkms BK117C2. PRESSURE SWITCH. ILLUMINATED. #1 ENGINE FUEL PRESSURE LIGHT ILLUMINATED ON CAD DURING FLIGHT. REMOVED AND REPLACED PRESSURE SWITCH IAW ARRIEL 1 E3 TAS
- [SDR DXTA2025050403346](https://openairdocs.org/sdr/DXTA2025050403346), May 4, 2025: Emb EMB505. INDICATOR. FALSE INDICATION. RIGHT ENGINE ENGINE FUEL FLOW INDICATION: RIGHT ENGINE FUEL FLOW NOT SHOWING CORRECT NUMBER IN CLIMB, CRUISE, DESCENT, O (N340QS)
- [SDR ASAA2025021456051](https://openairdocs.org/sdr/ASAA2025021456051), Feb 14, 2025: Boeing 737990ER. ENGINE. MALFUNCTIONED. NO. 1 ENGINE BURNING 200 LB/HR MORE THAN NO. 2 ENGINE. AFTER TURNING OFF CENTER PUMPS NO. 1 FUEL QUANTITY DROPPED QUICKL (N462AS)
- [SDR GTIA2025020338714](https://openairdocs.org/sdr/GTIA2025020338714), Jan 31, 2025: Airbus A320271N. TRANSMITTER. FAULT MESSAGE. ENG 1 FUEL LEAK ECAM DURING CRUISE NO FUEL LEAK OBSERVED-T/S PER TSM 73-00-00. R&R # 1 ENG FUEL FLOW TRANSMITTER IAW AMM (N959NK)
- [SDR ASAA2025012855629](https://openairdocs.org/sdr/ASAA2025012855629), Jan 28, 2025: Boeing 737990ER. TRANSMITTER. FAULTED. ENGINE NR 1 IS BURNING NEARLY 200 POUNDS PER HOUR MORE THAN ENGINE 2. PREVIOUS CREW ON INBOUND FLIGHT REPORTED 1,200 - 1 (N462AS)
- [SDR YENA2025011000035](https://openairdocs.org/sdr/YENA2025011000035), Jan 9, 2025: Airbus A321271NX. SENSOR. FAILED. FLT#1107, JFK-LHR. (ETOPS) 'ENG 2 MINOR FAULT ( MINOR FAULT CAUTIONS ON ECAM EWD ); TROUBLESHOT PER TSM 79-33-00-810-841 (N4080J)
- [SDR HALA20250108010](https://openairdocs.org/sdr/HALA20250108010), Jan 7, 2025: Airbus A330343. METERING UNIT. FAULTED. ETOPS - AMBER DASHES THROUGH LAST 3 DIGITS OF #1 ENGINE FUEL FLOW IN FLIGHT. PERFORMED BITE OF EEC, FOUND FMU FUEL FLOW  (N5843K)
- [SDR YENA2025010600018](https://openairdocs.org/sdr/YENA2025010600018), Jan 4, 2025: Airbus A321271NX. SENSOR. FAULTED. FLT#823, JFK-LAX. (ETOPS) 'ENG 2 MINOR FAULT BEFORE START ( MINOR FAULT CAUTIONS ON ECAM EWD ); T/S PER TSM 79-33--00-81 (N4074J)
- [SDR YENA2024072201020](https://openairdocs.org/sdr/YENA2024072201020), Jul 19, 2024: Airbus A321271N. CONTROLLER. FAILED. FLT#20, LHR-JFK. (ETOPS) 'UPON LANDING ENG 1 HEAT SYS DEGRADED ( HEAT SYS DEGRAD CAUTIONS ON ECAM E/WD ); REMOVED AND RE (N4022J)
- [SDR F3LA2024011500003](https://openairdocs.org/sdr/F3LA2024011500003), Jan 13, 2024: Airbus A320214. COMPUTER. FAULTY. AFTER TAKEOFF IN CLIMB OUT ENG 1 "REVERSER FAULT ECAM" CAME ON. RAN ALL CHECK LIST AND REPOSITIONED TO KDEN. LANDING UNE (N230FR)
- [SDR SWAA2023102012429](https://openairdocs.org/sdr/SWAA2023102012429), Oct 19, 2023: Boeing 7378H4. FILTER. FAULTY. LEFT FUEL BYPASS ILLUMINATED IN CLIMB<[01] R+R #1 MAIN ENG FUEL FILTER NO CONTAMINATES NOTED IAW AMM 73-34-01 EV # E0275 (N8311Q)
- [SDR YENA2023092901163](https://openairdocs.org/sdr/YENA2023092901163), Sep 26, 2023: Airbus A321271N. CONTROLLER. FAILED. FLT#1387, BOS-LAX. (ETOPS) ENG 2 HEAT SYSTEM DEGRADED ECAM AFTER LANDING ( HEAT SYS DEGRAD CAUTIONS ON ECAM EWD ); PER T (N2105J)
- [SDR ASAA2023092645344](https://openairdocs.org/sdr/ASAA2023092645344), Sep 26, 2023: Boeing 737890. FUEL FILTER. FAULTY. FUEL FILTER BYPAS LIGHT ON START UP. GROUNDED - YES. PERFORMED FIM 73-05 TASK 801. REPLACED FUEL FILTER CLOGGING INDICAT (N592AS)
- [SDR 6CBA2023091223001](https://openairdocs.org/sdr/6CBA2023091223001), Sep 11, 2023: Pilats PC1247E. UNKNOWN. UNKNOWN. DURING CRUISE FROM DEPARTING AIRPORT KACK ON A FLIGHT TO KBKL, THE CREW OBSERVED FLUCTUATING FUEL FLOW INDICATIONS OF 10 (N860AF)
- [SDR DALA2023070305331](https://openairdocs.org/sdr/DALA2023070305331), Jun 29, 2023: Boeing 737832. UNKNOWN. UNKNOWN. SHIP 3759 -ATB- DUE TO RIGHT ENGINE FUEL BYPASS LIGHT. CORRECTIVE ACTION: PERFORMED OVERWEIGHT LANDING INSPECTION, INSPE (N3759)
- [SDR HALA2023062700135](https://openairdocs.org/sdr/HALA2023062700135), Jun 26, 2023: Airbus A330243. UNKNOWN. UNKNOWN. ETOPS - ENG 2 LP PROT LOSS ( WARN/CAUT ON ECAM E/WD ENG LP SHAFT PROT ). REMOVED AND REPLACED N1 TURBINE SPEED PROBE PER (N373HA)
- [SDR ASAA2023062443744](https://openairdocs.org/sdr/ASAA2023062443744), Jun 24, 2023: Boeing 737890. UNKNOWN. UNKNOWN. WHILE PERFORMING TASK CARD 78273000 FOUND #1 ENGINE FAULT CODE 73-30311 THE START SWITCH SIGNAL AND ARINC BUS DATA DISAG (N562AS)
- [SDR ASAA2023052143332](https://openairdocs.org/sdr/ASAA2023052143332), May 21, 2023: Boeing 737890. UNKNOWN. UNKNOWN. REF ASA TC#78273000 #1 ENG SHOWS SHORT TIME FAULT 73-11281, EEC CHANNEL IS NOT ENERGIZED WITH THE ALTERNATOR VOLTAGE. GR (N529AS)
- [SDR 2023FA0000244](https://openairdocs.org/sdr/2023FA0000244), Apr 26, 2023: Bolkms BK117C2. PRESSURE SENSOR. ABNORMAL. FUEL PRESSURE SENSOR FAILED (N140SF)
- [SDR ASAA2023040442738](https://openairdocs.org/sdr/ASAA2023040442738), Apr 4, 2023: Boeing 737990ER. PRESSURE SWITCH. WARNING LIGHT. PER ASA T/C 78273000 LONG TIME FAULT ON ENGINE # 1 THE FUEL FILTER SIGNALS DISAGREE. MSG # 73-31071. GROUNDED - YES. REP (N474AS)
- [SDR ASAA2023040342719](https://openairdocs.org/sdr/ASAA2023040342719), Apr 3, 2023: Boeing 737990ER. PRESSURE SWITCH. UNKNOWN. AFTER TAXIING CLEAR OF THE RUNWAY, THE FILTER BYPASS ON THE #1 ENGINE OF THE FUEL PANEL LIGHT CAME ON. WE SHUT DOWN THE  (N474AS)
- [SDR ASAA2023030842252](https://openairdocs.org/sdr/ASAA2023030842252), Mar 8, 2023: Boeing 737890. TRANSMITTER. LEAKING. WHILE ACCOMPLISHING LEAK CHECK (REF ASA W/O 1944385 TSR) FOUND #1 ENG FUEL FLOW TRANSMITTER LEAKING AT IDLE. GROUNDED -  (N529AS)
- [SDR ASAA2023020441835](https://openairdocs.org/sdr/ASAA2023020441835), Feb 4, 2023: Boeing 737990ER. SWITCH. FAULTY. FILTER BYPASS LH ENG. GROUNDED - YES. REF B737-900 FIM 73-05 TASK 801, FOUND FAULT MSG NBR 73-31071 FLIGHT LEG 0. REMOVE (N472AS)
- [SDR ASAA2022122841317](https://openairdocs.org/sdr/ASAA2022122841317), Dec 28, 2022: Boeing 737890. TRANSMITTER. LEAKING. #2 ENGINE FUEL FLOW TRANSMITTER LEAKING AT 7 DROPS PER MINUTE DURING LEAK CHECKS AFTER ENGINE CHANGE. GROUNDED - YES. RE (N535AS)
- [SDR HNAA2022120600314](https://openairdocs.org/sdr/HNAA2022120600314), Dec 3, 2022: Emb EMB145LR. INDICATOR. FAULTED. NR 2 ENGINE FUEL IMPENDING BYPASS EICAS MESSAGE. ACCOMPLISHED MNT. PROC.APP1 73-4FUEL IMP BYP ADV MSG. AS A PRECAUTION,  (N627AE)
- [SDR NACA2022120200002](https://openairdocs.org/sdr/NACA2022120200002), Dec 2, 2022: Boeing 767323. INDICATOR. ERRATIC. L ENGINE FUEL FLOW INDICATION ERRATIC WHEN ENGINE ANTI-ICE IN USE. 4.5-6.5 FF. DEFERRED [PER MEL 73-31-01-02 CAT C @ 060 (N399CM)
- [SDR ASAA2022100540185](https://openairdocs.org/sdr/ASAA2022100540185), Oct 5, 2022: Boeing 737890. PRESSURE SWITCH. FAULTY. THE MAINTENANCE MESSAGE 73-31071 THE FUEL FILTER SIGNAL DISAGREE LONG TIME FAULT DEFERRABLE PER ASA T/C 78273000. GROUND (N534AS)
- [SDR ASAA2022091239933](https://openairdocs.org/sdr/ASAA2022091239933), Sep 12, 2022: Boeing 737890. UNKNOWN. LEAKING. WHILE ACCOMPLISHING IDLE LEAK CHECK OF HANDCRANKING DRIVE COVER, #1 ENGINE, NOTED FUEL RATE OF FLOW TRANSMITTER LEAKING. (N585AS)
- [SDR SWAA2022090648898](https://openairdocs.org/sdr/SWAA2022090648898), Sep 1, 2022: Boeing 7378H4. NONE. OUT OF TOLERANCE. AT ABOUT 12000 FEET DURING CLIMBOUT; WE NOTICED THAT THE #2 FUEL QUANTITY WAS DROPPING RAPIDLY. THE #1 FUEL QUANTITY WAS (N8322X)
- [SDR ASAA2022082939708](https://openairdocs.org/sdr/ASAA2022082939708), Aug 29, 2022: Boeing 737890. PRESSURE SWITCH. FAULTY. #1 ENGINE FUEL FILTER BY-PASS LIGHT CAME ON DURING CRUISE. NO OTHER ASSOCIATED INDICATIONS NOTED. GROUNDED - YES. REMOVE (N535AS)
- [SDR ASAA2022081039459](https://openairdocs.org/sdr/ASAA2022081039459), Aug 10, 2022: Boeing 737890. SENSOR. BENT. DURING REPLACEMENT OF J9 AND J10 HARNESSES ON ENG 1, REF ASA LOGPAGE 60482836, FOUND T3 SENSOR RECEPTACLE BENT. GROUNDED (N586AS)
- [SDR ASAA2022070638974](https://openairdocs.org/sdr/ASAA2022070638974), Jul 6, 2022: Boeing 737890. TRANSMITTER. LEAKING. REF ASA T/C #78472022 #2 ENG SPECIAL DETAILED INSP.(SOI)(BORESCOPE). FOUND FUEL FLOW TRANSMITTER LEAKING. GROUNDED - YES (N519AS)
- [SDR ASAA2022070438905](https://openairdocs.org/sdr/ASAA2022070438905), Jul 4, 2022: Boeing 737990ER. TRANSMITTER. LEAKING. #1 ENG FUEL FLOW TRANSMITTER FUEL LEAK. GROUNDED - YES. REMOVED AND REPLACED #1 ENG FUEL FLOW TRANSMITTER REF B737-900 A (N467AS)
- [SDR ASAA2022050538209](https://openairdocs.org/sdr/ASAA2022050538209), May 5, 2022: Boeing 737890. FUEL FILTER. FAULTY. ON TAXI OUT, #1 OIL FILTER BYPASS LIGHT FLASHED & THEN STAYED STEADY, EXTINGUISHED AFTER 5-10 SEC. 5 MIN LATER IT HAPPEN (N508AS)
- [SDR YENA2022041400372](https://openairdocs.org/sdr/YENA2022041400372), Apr 2, 2022: Airbus A300*. EEC. FAILED. (ETOPS) FLT #43, JFK-LGW. ENG 2 MINOR FAULT ( MINOR FAULT CAUTIONS ON ECAM EWD; PLACED ENG 2 MINOR FAULT ON CA-MEL 73-30 (N4022J)
- [SDR ASAA2022032737942](https://openairdocs.org/sdr/ASAA2022032737942), Mar 27, 2022: Boeing 7379. NONE. NONE. WHILE PERFORMING T/C #05-020-01, #1 ENG HAS FAULT CODE 73-41992 FUEL COOLED OIL COOLER (FCOC) DELTA PRESSURE SENSOR IS O (N971AK)
- [SDR SWAA2022033188718](https://openairdocs.org/sdr/SWAA2022033188718), Mar 27, 2022: Boeing 7378H4. EEC. ERRATIC. RT ENG FUEL FLOWS OSCILATES UP TO .25. N1;EGT;N2 MOVE WITH FUEL FLOW. ENG CONTROL LIGHT CAME ON AFTER LANDING. IN DESCEN (N8600F)
- [SDR ASAA2022031537694](https://openairdocs.org/sdr/ASAA2022031537694), Mar 15, 2022: Boeing 737900ER. TRANSMITTER. LEAKING. DURING #1 ENG LEAK CHECK FOUND FUEL FLOW XMITTER LEAKING AT AFT FLANGE. GROUNDED - YES. REMOVED AND REPLACED AND OPS/LEA (N407AS)
- [SDR QR9R20220216001](https://openairdocs.org/sdr/QR9R20220216001), Feb 16, 2022: Bolkms BK117C2. PRESSURE SWITCH. ILLUMINATED. DURING CRUISE FLIGHT #2 FUEL PRESSURE LIGHT ILLUMINATED INTERMITTENTLY AND REPEATEDLY FOLLOWED BY #2 VARNR NEEDLE SPIKE 
- [SDR ASAA2022020637378](https://openairdocs.org/sdr/ASAA2022020637378), Feb 6, 2022: Boeing 737890. HMU. FAULTY. WHILE PERFORMING TASK CARD 78273000, #1 ENG HAS SHORT TIME FAULT 73-30351 THE FMV POSITION SIGNAL DISAGREE, ON MULTIPLE  (N579AS)
- [SDR ASAA2022020637374](https://openairdocs.org/sdr/ASAA2022020637374), Feb 6, 2022: Boeing 737890. PRESSURE SWITCH. INOPERATIVE. LEFT FUEL FILTER BYPASS LIGHT ILLUMINATED AFTER ENGINE START. GROUNDED - YES. REF B737-800 AMM 73-34-01-000-801-F00 / 73 (N568AS)
- [SDR 2022FA0000077](https://openairdocs.org/sdr/2022FA0000077), Feb 3, 2022: Cessna 525. FUEL FILTER. WITHIN LIMITS. PLANE WAS RELOCATING FROM HND TO CRQ, DURING TAKE OFF PHASE CREW NOTICED THE FUEL FILTER BYPASS LIGHT CAME ON THE RIGHT  (N547TW)
- [SDR HNAA2022011700054](https://openairdocs.org/sdr/HNAA2022011700054), Jan 16, 2022: Emb EMB145LR. NONE. NONE. PDIS 626 73-30 2530071 16JAN22 BTV CLOSE E2 FUEL LOW TEMP ON EICAS DURING T/O ROLL ENG TEMPS E1 50C AND E2C_ENG PRESSURE (N626AE)
- [SDR NACA2021122500001](https://openairdocs.org/sdr/NACA2021122500001), Dec 25, 2021: Boeing 767323. NONE. NONE. SUPPLEMENTAL INFORMATION. ALL ASSOCIATED WIRING FOR LH EEC WDM 73-21-11 AND 73-21-13 WERE WRUNG OUT AND INSPECTED IAW 20 (N321CM)

All 407: https://openairdocs.org/jasc/7330/reports.md

## Other codes in chapter 73

- [JASC 7300](https://openairdocs.org/jasc/7300): Engine Fuel and Control (465 reports)
- [JASC 7310](https://openairdocs.org/jasc/7310): Engine Fuel Distribution (1,981 reports)
- [JASC 7311](https://openairdocs.org/jasc/7311): Engine Fuel/Oil Cooler (226 reports)
- [JASC 7312](https://openairdocs.org/jasc/7312): Fuel Heater (254 reports)
- [JASC 7313](https://openairdocs.org/jasc/7313): Fuel Injector Nozzle (529 reports)
- [JASC 7314](https://openairdocs.org/jasc/7314): Engine Fuel Pump (1,733 reports)
- [JASC 7320](https://openairdocs.org/jasc/7320): Fuel Controlling System (4,390 reports)
- [JASC 7321](https://openairdocs.org/jasc/7321): Fuel Control/Turbine Engines (2,878 reports)
- [JASC 7322](https://openairdocs.org/jasc/7322): Fuel Control/Reciprocating Engines (1,272 reports)
- [JASC 7323](https://openairdocs.org/jasc/7323): Turbine Governor (544 reports)
- [JASC 7324](https://openairdocs.org/jasc/7324): Fuel Divider (74 reports)
- [JASC 7331](https://openairdocs.org/jasc/7331): Fuel Flow Indicating (197 reports)
- [JASC 7332](https://openairdocs.org/jasc/7332): Fuel Pressure Indicating (158 reports)
- [JASC 7333](https://openairdocs.org/jasc/7333): Fuel Flow Sensor (80 reports)
- [JASC 7334](https://openairdocs.org/jasc/7334): Fuel Pressure Sensor (198 reports)
- [JASC 7397](https://openairdocs.org/jasc/7397): Engine Fuel System Wiring (532 reports)

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