# JASC 7712: Engine BMEP/Torque Indicating

- Type: JASC system/component code (FAA)
- ATA chapter: 77 Engine Indicating
- Title in the code table: ENGINE BMEP/TORQUE INDICATING
- Service difficulty reports: 1,239
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=66
- Page: https://openairdocs.org/jasc/7712

## What it covers

The system that senses and measures brake mean effective pressure (BMEP) or engine torque in turbo-prop and piston engines. Does not include internal parts which are type certificated with the engine. Typical parts are indicator, line, sensor, transmitter, pressure switch, etc.

## Service difficulty reports (1,239, newest 50)

- [SDR QR9R2026031300001](https://openairdocs.org/sdr/QR9R2026031300001), Mar 13, 2026: Bolkms BK117C2. TORQUE BOX. MALFUNCTIONED. ENGINE PARAMETER MALFUNCTION DURING START RUN-UP. REMOVED AND REPLACED TORQUE ADJUSTMENT BOX IAW AMM 77-12-00, 4-2. T/F 
- [SDR COEA2025072404711](https://openairdocs.org/sdr/COEA2025072404711), Jul 23, 2025: Cessna 208B. GAUGE. ERRATIC. FLT 8735, ENROUTE ANC-ENA AIR TURNBACK. DURING CLIMB OUT, THE PILOT NOTICED ERRATIC FLUCTUATIONS OF THE TORQUE GAUGE. RE (N711FX)
- [SDR ABXA2023050882](https://openairdocs.org/sdr/ABXA2023050882), May 2, 2023: Boeing 767231. TACH GENERATOR. INTERMITTENT. N1'S FLUCTUATING AT IDLE BOTH ENGINES 23.3-26.5 ACCOMPANIED BY INTERMITTENT VIBRATION IN COCKPIT THAT DOES NOT APPEAR ON (N651GT)
- [SDR YENA2023032700290](https://openairdocs.org/sdr/YENA2023032700290), Mar 26, 2023: Airbus A321271N. WIRE HARNESS. FAILED. FLT#523, JFK-LAX. (ETOPS) ENG 2 FADEC SYS FAULT; R & R WIRE HARNESS WO4 4088K REF L/P 3569608 (FOUND OPEN WIRE 3" BACK F (N2142J)
- [SDR ABXA2023021524](https://openairdocs.org/sdr/ABXA2023021524), Feb 13, 2023: Boeing 767281. UNKNOWN. UNKNOWN. AFTER ENGINE START RT ENGINE SHOWED N1 EXCEEDANCE 124.3 OUR START WAS NORMAL WITH NO EXCEEDANCE NOTED. AIRCRAFT BACK TO  (N774AX)
- [SDR QR9R20210928001](https://openairdocs.org/sdr/QR9R20210928001), Sep 28, 2021: Bolkms BK117C2. TORQUE BOX. SPLIT. ON HOVER, ENG SPLIT AND ENG PA DIS CAUTION ON CAD RESULTING IN A MISSION ABORT. A T/F EVALUATION REVEALED SYSTEM 1 AND 2
- [SDR UIEA2021080201669](https://openairdocs.org/sdr/UIEA2021080201669), Aug 1, 2021: Boeing 76731B. ENGINE. MALFUNCTIONED. ON CLIMBOUT NAI ON, LEFT ENG N1 2% LOWER THAN R ENG. LEFT N1 SHOWED 103.1, R ENG SHOWED 105.5. AFTER NAI SWITCH OFF, BOT (N1361A)
- [SDR UIEA2021020100169](https://openairdocs.org/sdr/UIEA2021020100169), Jan 28, 2021: Boeing 767306. SENSOR. FAILED. RIGHT ENGINE SPEED CARD STS MSG. R & R RT ENGINE N2 SPEED CARD OFF PN 285T0458-303, SN D04761. OPS CHECK NORMAL IAW AMM  (N1229A)
- [SDR UIEA2020052641121](https://openairdocs.org/sdr/UIEA2020052641121), May 24, 2020: Boeing 76733A. WARNING MESSAGE. FALSE ACTIVATION. RIGHT ENGINE ANALOG N2 STATUS MSG. PERFORMED FIM 77-12- FT 809. NO DEFECTS NOTED. MESSAGE CLEARED. (N1997A)
- [SDR UIEA2020043000922](https://openairdocs.org/sdr/UIEA2020043000922), Apr 30, 2020: Boeing 76733A. SENSOR. FAULTY. R ENG ANALOG N2 STATUS(<P>REPLACED N2 SPEED SENSOR AND PERFORMED POWER PLANT TEST 4 . CHKS GOOD PER AMM 71-00-00-795-034 (N1997A)
- [SDR COEA2019112601797](https://openairdocs.org/sdr/COEA2019112601797), Nov 26, 2019: Cessna 208B. INDICATOR. ERRATIC. FLIGHT 8775 ROUTE: PHX-FLG DISCREPANCY: DURING TAKEOFF, THE TORQUE GAUGE BEGAN TO GIVE ERRATIC READINGS. PILOT ELECTED T (N797FE)
- [SDR UIEA2019093005608](https://openairdocs.org/sdr/UIEA2019093005608), Sep 28, 2019: Boeing 76731A. STATUS MESSAGE. FALSE ACTIVATION. STATUS MESSAGES: L ENG ANALOG N2 &AMP; R ENG ANALOG N2.&NBSP;(<P>ACCOMPLISHED FIM 77-12 FT 806 AND FIM 71-01 FT 804, NO  (N662GT)
- [SDR UIEA2019090505445](https://openairdocs.org/sdr/UIEA2019090505445), Sep 4, 2019: Boeing 76731A. STATUS MESSAGE. FALSE ACTIVATION. R ENG ANALOG STATUS MESSAGE. L ENG ANALOG STATUS MESSAGE. ACCOMPLISHED FIM 77-12 FT 805, NO DISCREPANCIES NOTED. RESET E (N662GT)
- [SDR CA190725007](https://openairdocs.org/sdr/CA190725007), Jul 19, 2019: Bell 212. INDICATOR. SHORTED. (CAN) TORQUE GAUGE FAILED AND POPPED CIRCUIT BREAKER. (TC# 20190725007)
- [SDR UIEA2019070104635](https://openairdocs.org/sdr/UIEA2019070104635), Jun 30, 2019: Boeing 76731A. UNKNOWN. MALFUNCTIONED. DURING #1 ENGINE START, N1 DISPLAY WENT BLANK.(<P>ACCOMPLISHED FIM TASK 77-12 FT 803. RESET SYSTEM, OPS CHECK NORMAL (EE (N662GT)
- [SDR UIEA2019061324469](https://openairdocs.org/sdr/UIEA2019061324469), Jun 12, 2019: Boeing 767306. STATUS MESSAGE. FALSE ACTIVATION. STATUS MESSAGE, LEFT ENGINE SPEED CARD. PERFORMED OPS CHECK IAW PER B767 AMM 77-12-00. OPS CHECKED GOOD, NO STATUS MESSA (N1409A)
- [SDR CA190614003](https://openairdocs.org/sdr/CA190614003), Jun 1, 2019: Pilats PC1245. ENGINE. READS HIGH. (CAN) THE AIRCRAFT TOOK OFF AND AT ABOUT 1,000 FT. ABOVE GROUND LEVEL, PILOT GLANCED DOWN AT THE EIS (ENGINE INDICATING 
- [SDR UIEA2019031103516](https://openairdocs.org/sdr/UIEA2019031103516), Mar 9, 2019: Boeing 767306. WARNING SYSTEM. FALSE ACTIVATION. DURING ENG START MOMENTARY OVERSPEED WARNING MSG(<DIV>PERFORMED FIM TASK 71-01-00 PIMU BITE CHECK NO FAULT FOUND AT THIS (N1409A)
- [SDR QXEA2019082700331](https://openairdocs.org/sdr/QXEA2019082700331), Aug 27, 2018: Bombdr DHC8402. INDICATION SYS. FALSE INDICATION. ABORT TAKEOFF DUE TO NR 2 ENGINE TORQUE BUG TORQUE INDICATED 92% FOR ABOUT 1.5 SECONDS. ABORTED TAKE OFF. REMOVED FROM S (N432QX)
- [SDR 2018FA0000200](https://openairdocs.org/sdr/2018FA0000200), Jul 2, 2018: Dhav DHC6*. TRANSDUCER. FAILED. TORQUE PRESSURE TRANSDUCER FAILED (N812SS)
- [SDR UIEA2018040300522](https://openairdocs.org/sdr/UIEA2018040300522), Mar 28, 2018: Boeing 767375. SENSOR. INTERMITTENT. DURING CRUISE FLIGHT, N1 INDICATION FLUCTUATED INTERMITTENTLY, FOR THE NR 1 ENGINE. REMOVED AND REPLACED THE NR 1 ENG N1 (N1709A)
- [SDR UIEA2017060500939](https://openairdocs.org/sdr/UIEA2017060500939), Jun 7, 2017: Boeing 767306. SENSOR. ERRATIC. LEFT ENGINE N2 INDICATION FOUND ERRATIC ON EICAS DISPLAY DURING ENGINE RUN. THE LT ENGINE N2 SENSOR WAS REMOVED AND REPL (N1321A)
- [SDR PNSA2017040201](https://openairdocs.org/sdr/PNSA2017040201), Apr 2, 2017: Saab 2000SAAB. TORQUE SENSOR. FAULTED. RIGHT ENGINE POWER INDICATION FLUCTUATED PLUS OR MINUS G & PU'S RT ENGING MAINT AND APU STARTED AUTOMATICALLY. REMOVED A
- [SDR UIEA2017030900312](https://openairdocs.org/sdr/UIEA2017030900312), Mar 9, 2017: Boeing 76736N. SENSOR. FAILED. ENGINE VIBRATION BITE MAINTENANCE MESSAGE, PERFORMED FIM 77-31, FT 808, 77-31, FT 812. LEAD TO RT ENGINE N1 SENSOR SIGNA (N1049A)
- [SDR UIEA2017022200230](https://openairdocs.org/sdr/UIEA2017022200230), Feb 22, 2017: Boeing 76736N. INDICATION SYS. MALFUNCTIONED. AT RT ENGINE START, THE N1 INDICATION WAS ZERO UNTIL FUEL CONTROL WAS IN RUN, FAN ROTATION VERIFIED BY GROUND CREW WHEN  (N1049A)
- [SDR 2016F00236](https://openairdocs.org/sdr/2016F00236), Nov 12, 2016: Bell 407. TORQUEMETER. BLOCKED. PILOT EXPERIENCED HIGH TORQUE INDICATION ON INSTRUMENT. TROUBLESHOOTING WAS PERFORMED AND FOUND TO BE INTERNAL TO THE EN (N30HF)
- [SDR UIEA2016110700831](https://openairdocs.org/sdr/UIEA2016110700831), Oct 7, 2016: Boeing 76733A. SENSOR. MALFUNCTIONED. LEFT N2 ERRATIC BELOW 20% AT START. REMOVED AND REPLACED THE NR 1 ENGINE N2 SPEED SENSOR IAW AMM 77-12-02. OPS CHECKED N (N1997A)
- [SDR JJBA20160929002](https://openairdocs.org/sdr/JJBA20160929002), Sep 29, 2016: Dhav DHC8202. INDICATION SYS. FLUCTUATES. NR 1 TORQUE FLUCTUATING +/-20 % ABOVE 60% TORQUE. PERFORMED ENG PERFORMANCE TEST NO FLUCTUATION/SURGED NOTED. (N362PH)
- [SDR JJBA20160712003](https://openairdocs.org/sdr/JJBA20160712003), Jul 12, 2016: Dhav DHC8202. TSCU. INOPERATIVE. NR 2 ENGINE FEATHERED UNCOMMANDED. POWER UPTRIM ILLUMINATED. WHEN THE POWER WAS RETARDED THE PROP UNFEATHERED. WITH THE  (N358PH)
- [SDR HNAA2016061700186](https://openairdocs.org/sdr/HNAA2016061700186), Jun 16, 2016: Dhav DHC8102. TSCU. MALFUNCTIONED. DURING TAKEOFF ROLL AT 85 PERCENT TORQUE AUTO FX FAILED TO ARM, REJECTED T/O. LIGHT ILLUMINATED UPON REDUCED POWER. R &  (N938HA)
- [SDR JJBA20160614007](https://openairdocs.org/sdr/JJBA20160614007), Jun 14, 2016: Dhav DHC8202. TSCU. INOPERATIVE. NR 2 ENGINE TORQUE AT 150+ FOR 7-10 SECONDS. R & R NR 2 PROP ASSEMBLY AND R & R NR 2 TSCU. CREW SHUTDOWN THE ENGINE AND  (N375PH)
- [SDR JJBA20160210002](https://openairdocs.org/sdr/JJBA20160210002), Feb 10, 2016: Dhav DHC8202. TSCU. FAILED. ON CLIMB OUT AT 400 - 500 FEET, THE NR 1 ENG FEATHERED UNCOMMANDED. LOST ALL TORQUE. THE CREW RAN THE CHECKLIST & SHUTDO (N367PH)
- [SDR JIKA2016012001](https://openairdocs.org/sdr/JIKA2016012001), Jan 17, 2016: Emb EMB120ER. SIGNAL COND UNIT. INTERMITTENT. AFTER TAKEOFF, THE RT ENG AUTO FEATHERED. THE RT ENG TORQUE READOUT WAS ZERO. ALL OTHER ENG PARAMETERS SHOWED NORMAL ENG (N258AS)
- [SDR 6CBA20160106147](https://openairdocs.org/sdr/6CBA20160106147), Jan 6, 2016: Pilats PC1247E. INDICATION SYS. READS LOW. CREW REPORTED LOW TORQUE INDICATION, APPROX 5.2-5.3 PSI. (N978AF)
- [SDR CA160106014](https://openairdocs.org/sdr/CA160106014), Jan 4, 2016: Beech 200BEECH. LIMITER. STRIPPED. (CAN) PILOT HAD TO CARRY OUT A PRECAUTIONARY IN-FLIGHT SHUTDOWN OF NR 1 ENGINE DUE TO TORQUE FLUCTUATION AND OIL PRESSUR
- [SDR CA151204013](https://openairdocs.org/sdr/CA151204013), Dec 1, 2015: Dhav DHC8311. CONTROL UNIT. MALFUNCTIONED. (CAN) ON TAKE OFF FROM CLIMBING THROUGH 800FT NR 2 ENGINE EXPERIENCED AN UNSCHEDULED AUTOFEATHER. ENGINE WERE SET AT TAK
- [SDR CA160301007](https://openairdocs.org/sdr/CA160301007), Nov 20, 2015: Dhav DHC8102. INDICATOR. MALFUNCTIONED. (CAN) DURING CLIMB OUT, THE NR 1 ENGINE TORQUE INDICATION WENT TO 165%. THE POWER WAS REDUCED BUT THE TORQUE INDICATION 
- [SDR CA151120001](https://openairdocs.org/sdr/CA151120001), Nov 20, 2015: Dhav DHC8102. TSCU. MALFUNCTIONED. (CAN) DURING CLIMB OUT, NR 1 ENGINE TORQUE INDICATION WENT TO 165 PERCENT. POWER WAS REDUCED BUT TORQUE INDICATION REMAI
- [SDR JJBA20151119005](https://openairdocs.org/sdr/JJBA20151119005), Nov 19, 2015: Dhav DHC8202. UNKNOWN. MALFUNCTIONED. ON LANDING ROLLOUT WITH NR 2 ENG POWER LEVER AT DISK, THE TORQUE & RPM ADVANCED TO TAKEOFF POWER UN-COMMANDED. PERFORMED (N360PH)
- [SDR S9BA201510170014](https://openairdocs.org/sdr/S9BA201510170014), Oct 12, 2015: Dhav DHC6300. TRANSDUCER. MALFUNCTIONED. LT ENGINE ONLY PRODUCING 40 LBS TORQUE ON TAKEOFF. TAKEOFF WAS ABORTED. TORQUE TRANSDUCER WAS REPLACED IAW AMM 79-31.
- [SDR AALA20150915004](https://openairdocs.org/sdr/AALA20150915004), Sep 15, 2015: Boeing 757223. CIRCUIT CARD. FAULTY. AIR INTERRUPT, EMER DECLARED, LANDING UNEVENTFUL & ACFT OVERWEIGHT. DURING CLIMB RECEIVED A TAT PROBE EICAS MSG, NO AUTO (N176AA)
- [SDR CA150410019](https://openairdocs.org/sdr/CA150410019), Apr 9, 2015: Dhav DHC8301. INDICATOR. FALSE INDICATION. (CAN) NR 1 ENGINE TORQUE INDICATION BOTH ANALOGUE AND DIGITAL WENT TO TO ZERO AND NR 1 ECU WENT TO MANUAL MODE IN CLIMB.
- [SDR JJBA20150302001](https://openairdocs.org/sdr/JJBA20150302001), Mar 2, 2015: Dhav DHC8202. CONTROL UNIT. MALFUNCTIONED. NUMBER 2 ENG SHUTDOWN AT 500 FEET. AFTER NR 2 ENG SHUTDOWN PILOT HEARD PROP FEATHER ON ITS OWN. AUTO FEATHER WAS ARMED & (N360PH)
- [SDR HDNA201501230002](https://openairdocs.org/sdr/HDNA201501230002), Jan 23, 2015: Urocop BK117C1EURO. TORQUE SENSOR. UNKNOWN. UPON APPROACH TO DESTINATION HELIPAD & AS POWER REDUCED BELOW 80% N1, NR 2 ENG WAS NOTED TO DROP TO 0% TORQUE WITH ASSOC (N131LF)
- [SDR HNAA2015010700007](https://openairdocs.org/sdr/HNAA2015010700007), Jan 7, 2015: Dhav DHC8102. INDICATOR. INACCURATE. WHEN APPLYING POWER ON TAKEOFF ROLL, NR 1 WENT TO 80 PERCENT. NR 2 WOULD NOT GO ABOVE 28 PERCENT. R & R NR 2 TORQUE INDI (N942HA)
- [SDR AALA20141210015](https://openairdocs.org/sdr/AALA20141210015), Dec 10, 2014: Boeing 757223. TRANSMITTER. FAILED. DURING TAKEOFF CREW REPORTED RT ENGINE N3 INDICATION WAS ERRATIC. DURING CLIMB RT ENG BLEED VALVE WAS CYCLING OFF & ON,  (N690AA)
- [SDR AALA20141209016](https://openairdocs.org/sdr/AALA20141209016), Dec 9, 2014: Boeing 757223. TRANSMITTER. DEFECTIVE. AIR INTERRUPT, RETURNED & EMER NOT DECLARED. LANDING UNEVENTFUL & ACFT NOT OVERWEIGHT. DURING CLIMB THE LT ENG BLEED OFF (N690AA)
- [SDR JJBA20141206002](https://openairdocs.org/sdr/JJBA20141206002), Dec 6, 2014: Dhav DHC8202. TSCU. MALFUNCTIONED. NUMBER 1 ENG FAILED AFTER ACCELERATION. R & R NR 1 TSCU. (N375PH)
- [SDR CA141008003](https://openairdocs.org/sdr/CA141008003), Sep 9, 2014: Agusta AW139. INDICATOR. MALFUNCTIONED. (CAN) DURING LAST OPERATIONS BEFORE LANDING THE PILOT REPORTED THAT NR 1 ENGINE TORQUE INDICATION WAS DECREASING WHILE N
- [SDR CA141031001](https://openairdocs.org/sdr/CA141031001), Aug 25, 2014: Bell 407. WARNING LIGHT. ILLUMINATED. (CAN) CHIP LIGHT ILLUMINATED AND BOTH CHIP DETECTORS HAD MORE THAN PERMISSIBLE AMOUNT AND DIMENSIONS OF CHIPS. ENGINE SE

All 1,239: https://openairdocs.org/jasc/7712/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 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 7720](https://openairdocs.org/jasc/7720): Engine Temperature Indicating System (695 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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