# JASC 7720: Engine Temperature Indicating System

- Type: JASC system/component code (FAA)
- ATA chapter: 77 Engine Indicating
- Title in the code table: ENGINE TEMP. INDICATING SYSTEM
- Service difficulty reports: 695
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=67
- Page: https://openairdocs.org/jasc/7720

## What it covers

For general reports of the system components and parts which indicate engine temperature with insufficient information to file in a more specific JASC 7700 series code.

## Service difficulty reports (695, newest 50)

- [SDR CALA2026070917637](https://openairdocs.org/sdr/CALA2026070917637), Jul 7, 2026: Boeing 737724. THERMOCOUPLE. FAULTED. ENGINE 1 EGT IN AMBER RANGE DURING CLIMBOUT AT THRUST REDUCTION & ACCELERATION ALTITUDE 1112 FT. DURING TAXI OUT FLUCTUA (N23708)
- [SDR SWAA2026060808621](https://openairdocs.org/sdr/SWAA2026060808621), Jun 2, 2026: Boeing 73779P. SENSOR. OUT OF RANGE. MAX T/O THRUST MTJ 97.1 N1 ON CLIMB NR 2 EGT INDICATED 966. REDUCED NR 2 THRUST BELOW REDLINE. INDICATIONS NORMAL AFTER  (N7868K)
- [SDR ABXA20260525226](https://openairdocs.org/sdr/ABXA20260525226), May 25, 2026: Boeing 7673P6. THERMOCOUPLE. DEFECTIVE. AFTER ENG STARTS AND TAXI OUT, NOTICED LEFT ENGINE EGT INOP. NOTE: EGT LEFT ENGINE 72C RH 369C. CREW RETURNED TO THE GAT (N764CK)
- [SDR N6WA2026051802](https://openairdocs.org/sdr/N6WA2026051802), May 17, 2026: Cndair CL6002C11. WARNING MESSAGE. ILLUMINATED. LEFT ENG ITT OUT OF LIMITS DURING CLIMB TAKE OFF POWER 5 TO 10 SEC. CONFIRMED WITH MXC THE LT ENG EXPERIENCED AN ITT OF  (N537GJ)
- [SDR AALA202605043320](https://openairdocs.org/sdr/AALA202605043320), May 2, 2026: Boeing 7378. ENGINE. OVERTEMP. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO NR 2 ENGINE OVERHEAT LIGHT ILLUMINATED ON CLIMB OUT. AIRCRAFT AI (N328RR)
- [SDR N6WA2026041603](https://openairdocs.org/sdr/N6WA2026041603), Apr 14, 2026: Cndair CL6002C11. ENGINE. INDICATION. HIGH ITT ON LEFT ENG @ 89.9 N1. (PEAK TEMP 968 C). PERFORMED COMP WASH OF LEFT ENGINE IAW SP-44. REQUIRES POWER RUN TO C (N526GJ)
- [SDR N6WA2026041602](https://openairdocs.org/sdr/N6WA2026041602), Apr 14, 2026: Cndair CL6002C11. ENGINE. INDICATION. BETWEEN 80-90 KTS NOTICED LEFT ITT IND. 923 (2 TO 3 SEC) REJ TAKEOFF AND PROCEDED NORMALLY TO THE GATE. PERFORMED VISUAL (N526GJ)
- [SDR SWAA2026041688668](https://openairdocs.org/sdr/SWAA2026041688668), Apr 12, 2026: Boeing 7378. ENGINE. WARNING MESSAGE. ON CLIMB, RECEIVED A MASTER CAUTION WITH A LT ENG OVERHEAT MESSAGE PERFORMED QRH MESSAGE CLEARED AT 745 DEG EGT. RETURNE (N8794Q)
- [SDR CALA2026031714625](https://openairdocs.org/sdr/CALA2026031714625), Mar 13, 2026: Boeing 737824. THERMOCOUPLE. FAULTED. EGT ON CLMB OUT IN YELOW SAW 928 W/ A/T ON. PULLED THROTTLE BAC K TO NORMAL.A/T ON GOES TO928R & R CJ 10 HARNESS REF AMM (N77261)
- [SDR SWAA2026031679153](https://openairdocs.org/sdr/SWAA2026031679153), Mar 12, 2026: Boeing 7377H4. TAT PROBE. FAILED. BOTH ENGINES ONLY ACHIEVED 94.6 PERCENT N1 WHEN 95.5 PERCENT WAS REQUIRED-THRUST LEVERS WERE IN FULL FORWARD POSITION. N (N940WN)
- [SDR QR9R2025121000001](https://openairdocs.org/sdr/QR9R2025121000001), Dec 10, 2025: Bolkms BK117C2. THERMOCOUPLE. FAILED. ENGINE PARAMETER DISCONNECT ON TOT DURING START RUN-UP. A TESTFLIGHT EVAL REVEALED DURING ENG RUN-UP #1 FLI DEGRAD CAUTI
- [SDR 2025FA0000752](https://openairdocs.org/sdr/2025FA0000752), Nov 10, 2025: Bolkms BK117C2. PROBE. FAULTED. DURING START UP PILOT REPORTED POSSIBLE OVER TEMP OF ENGINE. AFTER FURTHER INSPECTION FOUND A BAD TEMP PROBE. (N340SF)
- [SDR QR9R2025102900001](https://openairdocs.org/sdr/QR9R2025102900001), Oct 29, 2025: Bolkms BK117C2. THERMOCOUPLE. FAILED. FLI DEGR NR 2 TOT NOT DISPLAYING DURING HOVER TAXI. DURING AIRCRAFT RECOVERY ON APPROACH, FLI DEGRADE APPEARED WITH TOT 
- [SDR SWAA2025093018896](https://openairdocs.org/sdr/SWAA2025093018896), Sep 27, 2025: Boeing 7377H4. PROBE. FAILED. APPROXIMATELY 5 MINUTES AFTER TAKE OFF. WE OBSERVED #1 EGT GAGE SOLID AMBER. WITH APPROXIMATELY 915 INDICATED. WE REDUCE (N222WN)
- [SDR QR9R2025091200001](https://openairdocs.org/sdr/QR9R2025091200001), Sep 12, 2025: Bolkms BK117C2. THERMOCOUPLE. FAILED. TOT FOR ENGINE #2 MISSING WITH FLI DEGRADE IN LOWER MESSAGE ZONE. TOT INDICATION ALSO MISSING FROM ENG STATUS PAGE (VEMD
- [SDR CALA2025090908668](https://openairdocs.org/sdr/CALA2025090908668), Sep 5, 2025: Boeing 737824. THERMOCOUPLE. FAULTED. DURING CRUISE NR 1 ENGINE EGT EXCEDANCE AND CONTINUED TO SURGE UNTIL ENGINE NEAR IDLE/LOW. DURING CREW DEBRIEF, OTHER EN (N14237)
- [SDR CALA2025082708197](https://openairdocs.org/sdr/CALA2025082708197), Aug 24, 2025: Boeing 737924ER. THERMOCOUPLE. FAULTED. RIGHT ENGINE EXCEEDED EGT 964. R & R NR 2 ENG LEFT UPPER EGT PROBE (T49.5S4) IAW AMM 77-21-04-401. PROBE TESTS OK, R & R (N68453)
- [SDR F3LA202508220286](https://openairdocs.org/sdr/F3LA202508220286), Aug 20, 2025: Airbus A321211. EGT INDICATION. ILLUMINATED. ENG 1 EGT OVERLIMIT SHUTDOWN ENG IN FLIGHT. PERFORMED AMM 72-00-00-200-008-A ENGINE DAMAGE WITHIN AREA C. PER AMM REQUIR (N722FR)
- [SDR FDEA202508021355](https://openairdocs.org/sdr/FDEA202508021355), Aug 2, 2025: Airbus A300B4622R. THERMOCOUPLE. FAILED. AFTER TAKEOFF, HAD FLUXING VIBRATION ON CLIMB OUT. MONITORED INSTRUMENTS AND NOTHING WAS OUT OF LIMITS. UPON REACHING AP (N729FD)
- [SDR QR9R2025072900001](https://openairdocs.org/sdr/QR9R2025072900001), Jul 29, 2025: Bolkms BK117C2. THERMOCOUPLE. FAILED. ENG PA DISC AND #2 FLI DEGRADED CAUTIONS ILLUMINATED DURING FLIGHT. TROUBLESHOOTING REVEALED #2 ENGINE TOT INDICATION FL
- [SDR SWAA2025061379494](https://openairdocs.org/sdr/SWAA2025061379494), Jun 7, 2025: Boeing 7378H4. EGT INDICATION. ILLUMINATED. AFTER ROTATION THE NUMBER 2 ENGINE EXCEEDED THE EGT LIMITATION. THE EGT WAS SOLID RED AND WE SAW 906 COMPLETED QRH ENGIN (N8669B)
- [SDR YENA2025051400491](https://openairdocs.org/sdr/YENA2025051400491), May 14, 2025: Airbus A321271NX. SENSOR. FAILED. FLT#73, JFK-EDI. (ETOPS) ' NAC TEMP FLASHING AT 365 DEG SHUT ENG 1 DOWN PIC CALLED MCC NO RESET AFTER SECOND ENG START A (N2151J)
- [SDR QR9R2025051200002](https://openairdocs.org/sdr/QR9R2025051200002), May 12, 2025: Bolkms BK117C2. THERMOCOUPLE. OUT OF TOLERANCE. WHILE TAKING OFF TO A HOVER ENG PA DISP CAUTION MESSAGE APPEARED ON 1 & 2. TOT INDICATIONS TURNED YELLOW AND ENG #1 INDI
- [SDR AALA202504140323](https://openairdocs.org/sdr/AALA202504140323), Apr 12, 2025: Boeing 737823. WARNING MESSAGE. FALSE INDICATION. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: NUMBER 1 ENGINE EGT OVER TEMP ON TAKEOFF, EGT REACHED 962 DEGRE (N960AN)
- [SDR AALA202504071775](https://openairdocs.org/sdr/AALA202504071775), Mar 24, 2025: Airbus A320232. DUCT. BLOWN. AIRCRAFT WAS GROUNDED: AFTER TAKEOFF NAC TEMP FLASHING ON RIGHT ENG. TEMP UP TO 380.EGT RIGHT ENGINE 630. NAC TEMP REMAI (N650AW)
- [SDR QR9R2025031700004](https://openairdocs.org/sdr/QR9R2025031700004), Mar 17, 2025: Bolkms BK117C2. THERMOCOUPLE. OUT OF TOLERANCE. DURING HOVERING FLIGHT, ENG PA DIS (TOT) ENG #1 READING 540 C, ENG #2 READING 220 C. DURING TROUBLESHOOTING FOR #2 ENGIN
- [SDR QR9R2025031100005](https://openairdocs.org/sdr/QR9R2025031100005), Mar 11, 2025: Bolkms BK117C2. THERMOCOUPLE. FAILED. FLI DEGRADED ON THE NUMBER ONE ENGINE FOR TOT AFTER START UP. TROUBLESHOOTING REVEALED #1 ENGINE THERMOCOUPLE BOX FAILED
- [SDR DXTA2025031702572](https://openairdocs.org/sdr/DXTA2025031702572), Mar 3, 2025: Cessna 680SOV. SHUTOFF VALVE. MALFUNCTIONED. LEFT ENGINE ITT EXCEEDANCE. WHILE IN CLIMB ABOUT 38,000 FEET WITH THRUST SET AT MCT, THE LEFT ENGINE ITT WENT INTO THE Y (N376QS)
- [SDR DXTA2025030702572](https://openairdocs.org/sdr/DXTA2025030702572), Mar 3, 2025: Cessna 680SOV. ENGINE. OVERTEMP. LEFT ENGINE ITT EXCEEDANCE. WHILE IN CLIMB ABOUT 38,000 FEET WITH THRUST SET AT MCT, THE LEFT ENGINE ITT WENT INTO THE Y (N376QS)
- [SDR AALA202502111588](https://openairdocs.org/sdr/AALA202502111588), Feb 10, 2025: Airbus A321231. THERMOCOUPLE. INOPERATIVE. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO SEA DUE TO THE FLIGHT CREW REPORTING THAT  (N118NN)
- [SDR YQSA20250205001](https://openairdocs.org/sdr/YQSA20250205001), Feb 4, 2025: Beech C90. WARNING MESSAGE. ACTIVATED. CRUISING AT FL230 WHEN ITT ON RIGHT SPIKED TO 900-1000 DEGREES C. TORQUE FELL SHORTLY AFTER DROPPING TO "0". RPM WAS 200 (N590SH)
- [SDR HALA20250121026](https://openairdocs.org/sdr/HALA20250121026), Jan 19, 2025: Airbus A330243. THERMOCOUPLE. BROKEN. ETOPS - #ENG 1 HP/IP TURBINE VENT OVERHEAT CHANNEL A THERMOCOUPLE BROKEN. REPLACED THERMOCOUPLE AS HP/IP BEARING COMPART (N393HA)
- [SDR KC8A20241211005](https://openairdocs.org/sdr/KC8A20241211005), Dec 11, 2024: Lear 35A. SENSOR. FAULTED. RIGHT ENGINE ROLLED BACK AND SHUT DOWN ON DESCENT. REPLACED RH ENGINE INLET PRESSURE AND TEMPERATURE SENSOR WITH A SERVI (N298CK)
- [SDR CVGA20241114001](https://openairdocs.org/sdr/CVGA20241114001), Nov 11, 2024: Beech B300. ENGINE. OVERTEMP. #1 ENG ITT CLIMBED QUICKLY TO OVER 1000 DEGREES AND FLUCTUATED BETWEEN 1000 AND 1100 DEGREES FOR OVER ONE MINUTE. EMERGE (N849UP)
- [SDR YENA2024111101443](https://openairdocs.org/sdr/YENA2024111101443), Nov 7, 2024: Airbus A321271N. ENGINE. ABNORMAL. FLT#2224, MCO- DCA- (AIRCRAFT DIVERTED TO RDU).' MULTIPLE ENG 1 ENG FAULTS IN FLIGHT/ ENG 1 MODE FAULT AUTO THRUST OFF E (N595JB)
- [SDR DALA2024110810767](https://openairdocs.org/sdr/DALA2024110810767), Nov 7, 2024: Airbus A321211. SHAFT. DAMAGED. SHIP 3075-ATB- RETURNING TO BOS DUE TO NBR 2 ENGINE EGT OVERTEMP. CORRECTIVE ACTION: EGT REACHED 985. REPLACED VBV FLEXI (N375DN)
- [SDR CALA2024102400914](https://openairdocs.org/sdr/CALA2024102400914), Oct 22, 2024: Boeing 767424ER. THERMOCOUPLE. FAULTY. AT ABOUT 105KTS LEFT ENG EGT GAUGE COMPLETELY BLANKED OUT...RTO ENG NORMAL ON TAXI IN UPDATED MAA CODE FIX USING VENDOR  (N76064)
- [SDR CALA2024101700850](https://openairdocs.org/sdr/CALA2024101700850), Oct 14, 2024: Boeing 737924ER. THERMOCOUPLE. FAULTED. ENG 1 EXCEEDANCE AT APPROX 800 AGL. RETURNED TO LIMITS IMMEDIAT ELY. LOADED PICTURES 1 IN FLIGHGT AND 1 POST FLIGHT CURR (N37419)
- [SDR DXTA2024092300587](https://openairdocs.org/sdr/DXTA2024092300587), Sep 18, 2024: Bombdr BD1001A10. ENGINE. WARNING MESSAGE. IN CLIMB DETENT IN A CLIMB APPROX 27000 FEET R ENGINE EXCEEDANCE CAS ILLUMINATED. WE DID NOT NOTICE A RED ENGINE INSTRUM (N784QS)
- [SDR I5PA2024072488806](https://openairdocs.org/sdr/I5PA2024072488806), Jul 24, 2024: Boeing 757230. THERMOCOUPLE. FAULTY. FLT: N/A. ESI - RH ENG HOT SECTION INSP. REQUIRED DISCREPANCIES: RH ENG EGT EXCEEDANCE, HOT SECTION INSPECTION REQUIRED. (N888LT)
- [SDR I5PA2024072488805](https://openairdocs.org/sdr/I5PA2024072488805), Jul 24, 2024: Boeing 757230. THERMOCOUPLE. FAULTY. FLT: N/A. ESI - RH ENG HOT SECTION INSP. REQUIRED. DISCREPANCIES: RH ENG EGT EXCEEDANCE, HOT SECTION INSPECTION REQUIRED (N888LT)
- [SDR SWAA2024072315410](https://openairdocs.org/sdr/SWAA2024072315410), Jul 22, 2024: Boeing 7378H4. ENGINE. DETERIORATED. ON CLIMB OUT EGT EXCEED 925' ON #2 ENGINE (ENGINE EXCEEDENCES PAGE SHOWS PEAK 957'; RED 950' FOR 7.8S)<[01] PERFORMED GV (N8640D)
- [SDR CALA2024062601895](https://openairdocs.org/sdr/CALA2024062601895), Jun 20, 2024: Airbus A320232. SOLENOID VALVE. FAULTED. #2 ENGINE EGT EXCEEDANCE ON TAKE OFF. #2 ENGINE EGT EXCEEDANCE ON TAKE OFF, 77-00-00-810-818-B. REPORTING MAX OF 651 FOR (N490UA)
- [SDR DXTA2024040511404](https://openairdocs.org/sdr/DXTA2024040511404), Apr 4, 2024: Cessna 560XL. ENGINE. DAMAGED. JUST AFTER TAKEOFF AROUND 200 FEET AGL WE NOTICED A BURNING SMELL AND FOUND THAT THE ITT ON THE RIGHT ENGINE WAS UP NEAR (N609QS)
- [SDR 2024F00080](https://openairdocs.org/sdr/2024F00080), Mar 15, 2024: Swrngn SA227AC. EGT INDICATION. ACTIVATED. LH SRL COMPUTER INDICATES SPIKES, OPEN FUEL BY PASS. (N746KA)
- [SDR CALA2024030500638](https://openairdocs.org/sdr/CALA2024030500638), Mar 2, 2024: Boeing 737824. THERMOCOUPLE. INTERMITTENT. RIGHT EGT INDICATION 931 ON CLIMB APROX 15000. RAPIDLY DECREASED TO 890 RAPIDLY DECREASED TO PER DFD 142 REPORT - DURING (N73270)
- [SDR ASAA2023110846082](https://openairdocs.org/sdr/ASAA2023110846082), Nov 8, 2023: Boeing 737890. UNKNOWN. UNKNOWN. REF TC78273000 #1 ENG DISPLAYS ECONOMIC FAULT 77-20871 THE TOP LEFT EGT SIGNAL T495S4 IS OUT OF RANGE. GROUNDED - YES. O (N593AS)
- [SDR ASAA2023110546004](https://openairdocs.org/sdr/ASAA2023110546004), Nov 5, 2023: Boeing 737990ER. UNKNOWN. UNKNOWN. WHILE ACCOMP TC 78273000 N'1 ENG ECONOMIC FAULT 77-20871 "TOP LEFT EGT SIGNAL OUT OF RANGE ". GROUNDED - YES. ON DEFERRA (N472AS)
- [SDR ASAA2023110546002](https://openairdocs.org/sdr/ASAA2023110546002), Nov 5, 2023: Boeing 737890. UNKNOWN. UNKNOWN. PERFORMED T/C 78273000 INTERROGATE THE FMC CDU FOR ENGINE FAULTS ENG#2 EEC BITE TEST FOUND ENG @2 ECONOMIC FAULT MESSAGE (N589AS)
- [SDR ASAA2023110446000](https://openairdocs.org/sdr/ASAA2023110446000), Nov 4, 2023: Boeing 737990ER. UNKNOWN. UNKNOWN. FOUND FC 77-20862 ON #2 ENG BOTTOM LEFT EGT SIGNAL OUT OF RANGE. DURING FMC CDU INTERROGATION. (ECONOMIC FAULT). GROUNDE (N419AS)

All 695: https://openairdocs.org/jasc/7720/reports.md

## Other codes in chapter 77

- [JASC 7700](https://openairdocs.org/jasc/7700): Engine Indicating System (705 reports)
- [JASC 7710](https://openairdocs.org/jasc/7710): Power Indicating System (191 reports)
- [JASC 7711](https://openairdocs.org/jasc/7711): Engine Pressure Ratio (EPR) (456 reports)
- [JASC 7712](https://openairdocs.org/jasc/7712): Engine BMEP/Torque Indicating (1,239 reports)
- [JASC 7713](https://openairdocs.org/jasc/7713): Manifold Pressure (MP) Indicating (77 reports)
- [JASC 7714](https://openairdocs.org/jasc/7714): Engine RPM Indicating System (1,357 reports)
- [JASC 7721](https://openairdocs.org/jasc/7721): Cylinder Head Temperature (CHT) Indicating System (62 reports)
- [JASC 7722](https://openairdocs.org/jasc/7722): Engine EGT/TIT Indicating System (1,198 reports)
- [JASC 7730](https://openairdocs.org/jasc/7730): Engine Ignition Analyzer System (52 reports)
- [JASC 7731](https://openairdocs.org/jasc/7731): Engine Ignition Analyzer (15 reports)
- [JASC 7732](https://openairdocs.org/jasc/7732): Engine Vibration Analyzer (237 reports)
- [JASC 7740](https://openairdocs.org/jasc/7740): Engine Integrated Instrument System (53 reports)
- [JASC 7797](https://openairdocs.org/jasc/7797): Engine Indicating System Wiring (592 reports)

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