# Service difficulty reports: JASC 7601

A list on [JASC 7601](https://openairdocs.org/jasc/7601.md).

Reports filed under 7601 · Engine Synchronizing, newest first.

- [SDR 2025FA0000075](https://openairdocs.org/sdr/2025FA0000075.md): Control Box · disengaged · Jan 31, 2025 · N340SF · Bolkms BK117C2
  > DURING DECENT THE VARTOMS SYSTEM DISENGAGED. CAUSING THE NUMBER 1 ENGINE TORQUE TO DECREASE. THE PILOT WAS UNABLE TO GET THE TORQUES MATCHED MANUALLY. ABORTED THE LANDING AND PROCEEDED TO AN AIRPORT TO PERFORM A PRECAUTIONARY LANDING. AFTER EXTENSIVE TROUB
- [SDR DALA2023070305338](https://openairdocs.org/sdr/DALA2023070305338.md): Unknown · unknown · Jun 1, 2023 · N375NC · Airbus A320212
  > SHIP 3275 STRONG FIRE SMELL FROM ENG ONE ON STUTDOWN STRONG EXHAUST SMELL ON THE FLT DECK MOMENTARLY. CORRECTIVE ACTION: R/R #1 ENGINE RIGHT COWL ACTUATOR LEAKING. (4743986)
- [SDR QXEA2022052700208](https://openairdocs.org/sdr/QXEA2022052700208.md): Autothrottle Sys · inoperative · May 25, 2022 · N631QX · Emb ERJ170200LR
  > AUTOTHROTTLE REPEATIDLY DISENGAGES IN DECENT. PLACED ON MEL MEL CLEARED BY REPLACEDMENT OF THRUST CONTROL QUADRANT, OP TEST GOOD PER E175 AMM 22-11-00-710-801-A. RETURNED TO SERVICE.
- [SDR IPXA2022052082270](https://openairdocs.org/sdr/IPXA2022052082270.md): Relay · inoperative · May 19, 2022 · N453UP · Boeing 75724APF
  > INSPECTION TYPE:NAL ENG IDLE IS HIGHER THAN R ENG IN GND, FLT IDLE AS WELL AS WHEN SPOOLING UP. ALL ENG PARAMETERS EPR/EGT/N2/N3/FF SHOW HIGHER DURING GND/FLT IDLE & SPOOL UP NOTE: BLEED AIR DUCT PSI HAS SIGNIFICANT DIFFERENCE, BOTH PACKS.R&R L ENG IDLE CONTRO
- [SDR ASAA2022041037991](https://openairdocs.org/sdr/ASAA2022041037991.md): Lever · faulted · Apr 10, 2022 · N589AS · Boeing 737890
  > FAULT CODE 76-21362. THE START LEVER SIGNALS DISAGREE. REF 737-800 FIM 76-11 TASK 801. ENGINE 2 LONG TIME FAULT. DEFERRED PER T/C 78273000. GROUNDED - YES. REPLACED #2 ENG EEC REF B737-800 AMM 73-21-60-400-801. ALL EEC OP CHKS AND SOFTWARE CONFIG CHKS GOOD RE
- [SDR CA190314015](https://openairdocs.org/sdr/CA190314015.md): Power Lever · stiff · Mar 12, 2019 · Aerosp ATR42300
  > (CAN) BOTH POWER LEVERS VERY STIFF AND TOUGH TO MOVE SMOOTHLY. POWER LEVER QUADRANT CLEANED. FUNCTION TEST OF POWER CONTROL TRAVEL/KINEMATIC EFFORT CARRIED OUT IAW JIC 76-11-00 FUT 10010.
- [SDR AALA20170201019](https://openairdocs.org/sdr/AALA20170201019.md): Control Box · faulty · Jan 29, 2017 · N954U · Doug DC982
  > AIRCRAFT WAS GROUNDED. DFW-MSY FLIGHT RETURNED TO DFW. LANDING UNEVENTFUL. DURING CLIMB, CREW REPORTED THEY WERE UNABLE TO ESTABLISH CLIMB POWER. THE RIGHT ENGINE EPR, N1, AND N2 WERE FLUCTUATING. REMOVED AND REPLACED ENGINE SYNC ACTUATOR(AALA20170129005) AND
- [SDR AALA20170129005](https://openairdocs.org/sdr/AALA20170129005.md): Actuator · faulty · Jan 29, 2017 · N954U · Doug DC982
  > AIRCRAFT WAS GROUNDED. DFW-MSY FLIGHT RETURNED TO DFW. LANDING UNEVENTFUL. DURING CLIMB, CREW REPORTED THEY WERE UNABLE TO ESTABLISH CLIMB POWER. THE RIGHT ENGINE EPR, N1, AND N2 WERE FLUCTUATING. REMOVED AND REPLACED ENGINE SYNC ACTUATOR AND ENGINE SYNC CONTR
- [SDR AALA20161222004](https://openairdocs.org/sdr/AALA20161222004.md): Control Box · faulty · Dec 20, 2016 · N70425 · Doug DC982
  > TAKEOFF ABORTED AT 82 KNOTS AT DFW. NORMAL ABORT. LEFT ENGINE ACCELERATED NORMALLY TO 1.4 EXHAUST PRESSURE RATIO BUT NEVER BEYOND 1.5. MANUALLY PUSHED THROTTLES FORWARD WITH NO RESPONSE. DISENGAGED AUTO-THROTTLES. AIRCRAFT WAS GROUNDED. REMOVED AND REPLACED
- [SDR AALA20161220013](https://openairdocs.org/sdr/AALA20161220013.md): Actuator · faulty · Dec 20, 2016 · N70425 · Doug DC982
  > TAKEOFF ABORTED AT 82 KNOTS AT DFW. NORMAL ABORT. LEFT ENGINE ACCELERATED NORMALLY TO 1.4 EXHAUST PRESSURE RATIO BUT NEVER BEYOND 1.5. MANUALLY PUSHED THROTTLES FORWARD WITH NO RESPONSE. DISENGAGED AUTO-THROTTLES. AIRCRAFT WAS GROUNDED. REMOVED AND REPLACED
- [SDR 9JLA201506247566](https://openairdocs.org/sdr/9JLA201506247566.md): Controller · defective · May 12, 2015 · N304HE · Raythn HAWKER800
  > CREW REPORTED THAT DURING FLIGHT THE RT ENG DEEC LIGHT CAME ON AT 86% N1. THE CREW INDICATED THAT THE ENG DIVERTED TO MANUAL MODE. TROUBLE SHOT THE DISCREPANCY & FOUND THAT THE ENG SYNC CONTROLLER WAS DEFECTIVE. THE UNIT WAS R & R WITH AN EXCHANGE UNIT PN 2
- [SDR REXA2013012100175](https://openairdocs.org/sdr/REXA2013012100175.md): Unknown · malfunctioned · Jan 21, 2013 · N8896A · Cndair CL6002B19
  > LEFT ENGINE SPOOL UP TIME LAGS BEHIND RIGHT ENGINE CAUSING UNNECESSARY YAW TENDENCIES IN FLIGHT. ALSO CAUSE LOSS OF DIRECTIONAL CONTROL ON "THURST REVERSER" DEPLOYMENT. W N1 MATCHED, THE N2 FOR RIGHT ENGINE IS LOWER BY 25%. THRUST LEVERS ARE NEARLY IMPOSSIB
- [SDR REXA2012042100544](https://openairdocs.org/sdr/REXA2012042100544.md): Control System · out of rig · Apr 21, 2012 · N8543F · Cndair CL6002B19
  > LT & RT ENGINES HAVE MORE THAN 1/2 KNOB SPLIT AT THROTTLES AT POWER OF DAY. /R LT MAIN FUEL CONTROL IAW AMM 73-21-01. OP/C & LEAK CHECK GOOD. PROBLEM CONTINUED. FOUND RT THROTTLE CONTROL SYSTEM OUT OF RIG RIGGED PER AMM 76-10-00 AND VG FEEDBACK RIGGED PER A
- [SDR HALA2010102700501](https://openairdocs.org/sdr/HALA2010102700501.md): Syncronizer · out of adjust · Oct 27, 2010 · N598HA · Boeing 767332
  > ETOPS SIGNIFICANT SYS - AT LOW TO MID RANGE POWER SETTING ENGINES ARE OUT OF SYNC BY ABOUT 1 PERCENT, AS OF 10/27/10, NR1 ENG HAS 61,562 TSO. NR 2 ENG HAS 14,934 TSO. ALL ENG "EPR" LIMITS NORMAL. OK FOR SERVICE.
- [SDR HALA2010072100320](https://openairdocs.org/sdr/HALA2010072100320.md): Unknown · malfunctioned · Jul 21, 2010 · N580HA · Boeing 76733A
  > ETOPS SIGNIFICANT SYSTEM - STATUS MSG DURING CLIMB RT EEC C1, NO ALT ON R EEC. THROTTLES SPLIT DURING CRUISE TO KEEP SYNC ALL OTHERS OP NORMAL. T/S PER FIM 73-00-00/501 AND BITE CODE INDEX PIMU DUE TASK 71-00-00 GROUND TEST 12 PERFORMED RT ENG GROUND TEST 12
- [SDR HNAA2009051300143](https://openairdocs.org/sdr/HNAA2009051300143.md): Syncronizer · out of rig · May 12, 2009 · N804EX · Dhav DHC8102
  > ON TAKEOFF ROLL, NUMBER ONE PROPELLER INDICATED 1214. FOUND NUMBER ONE ENGINE OUT OF RIG. PERFORMED RIGGING WORK CARD 76-00-01. OPS CHECK GOOD. OK FOR SERVICE.
- [SDR BAQA200700025](https://openairdocs.org/sdr/BAQA200700025.md): Switch · worn · May 18, 2007 · N969ME · Urocop EC135T1
  > DURING REGULAR FUNCTIONAL CHECK OF ENGINE START SWITCHES, DISCOVERED THE NR1 AND NR2 ENGINE STARTING SWITCHES TO HAVE WORN DETENT IN THE SWITCH. THE SWITCH WAS ABLE TO BE MOVED FROM THE FLY POSITION TO THE OFF POSITION WITH OUT PULLING OUT OF DETENT.
- [SDR 05FDEA00096](https://openairdocs.org/sdr/05FDEA00096.md): Throttle Cable · frozen · Jan 15, 2005 · N309FE · Doug DC1030
  > NR 2 ENGINE THRUST LEVER REMAINED FROZEN AT 80 PERCENT ON DESCENT INTO SJC. DID A PRECAUTIONARY SHUTDOWN AT 10,000 FT. NO OTHER PROBLEMS NOTED. UPON CREW DEBRIEF FOUND NR 2 THROTTLE LEVER STUCK AT 1/3 TRAVEL. MOVED THROTTLE LEVER AND FOUND SLIGHT BIND WHI
- [SDR 05FDEA00095](https://openairdocs.org/sdr/05FDEA00095.md): Throttle Cable · contaminated · Jan 14, 2005 · N565FE · Doug MD1010F
  > ON DESCENT NR 2 ENGINE THROTTLE WOULD NOT RETARD. ENGINE STUCK AT 85 PERCENT N2, FUEL FLOW WAS INOP. PERFORMED PRECAUTIONARY SHUTDOWN. PURGED CABLE OF MOISTURE PER MM SUPPLEMENT 76-11-01 -2 / 5A STEP 6, ALL TEST PAST PER MM 76-11-01-2 PARAGRAPH 4.
- [SDR 04261421](https://openairdocs.org/sdr/04261421.md): Warning Light · false indication · Sep 17, 2004 · N421FJ · Dorner DO328300
  > SLOW SPEED ABORT DUE TO ENGINE MISCOMPARE MESSAGE. MECHANIC PERFORMED ENGINE RUNS AT MULTIPLE POWER SETTINGS. NO DEFECT NOTED. COULD NOT DUPLICATE
- [SDR Z1RA096970](https://openairdocs.org/sdr/Z1RA096970.md): Torque Box · intermittent · Aug 23, 2004 · N760AF · Skrsky S76C
  > REPLACED TORQUE TRIM CONFORMATION BOX. NO FURTHER DEFECTS
- [SDR GTIA020481](https://openairdocs.org/sdr/GTIA020481.md): Syncronizer · failed · Mar 13, 2002 · N806NK · Doug DC981
  > FTW - NR 1 ENGINE AT LOW LIMIT WOULD COMPLETELY UNSPOOL. PERFORMED TEST OF ENGINE SYNCHRONIZER SYSTEM. SYSTEM FAILED TEST, NO SYNCHRONIZATION OF ENGINE. PERFORMED ADJUSTMENT SYNCHRONIZER ENGINE ACTUATOR. SERVICED FUEL CONTROL UNIT ACCELERATION CHAMBER WITH
- [SDR USAABA01015](https://openairdocs.org/sdr/USAABA01015.md): Control Unit · failed · Nov 30, 2001 · N673UW · Airbus A330323
  > PHL - FLT 126 - EN ROUTE PHL-LGW, CREW RECEIVED THE E/W 'ENGINE 2 EPR MODE FAULT' AND NOTED A TWO INCH THROTTLE SPLIT. FLIGHT RETURNED TO PHL AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE RIGHT ENGINE RELAY CONTROL UNIT. (M)
- [SDR SIMA2454](https://openairdocs.org/sdr/SIMA2454.md): Control Unit · failed · Sep 1, 2000 · N323AE · Saab 340B
  > SBA - FLT 3071 - CREW LOST ALL POWER LEVER CONTROL OF RT ENGINE DURING CRUISE. 9-8-00: REMOVED AND REPLACED RIGHT ENGINE DECU IAW AMM 74-00-00. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. (X)
- [SDR CA991112018](https://openairdocs.org/sdr/CA991112018.md): Actuator · failed · Nov 1, 1999 · Cessna 550
  > (CAN) ACTUATOR HAD EXCESSIVE DEAD BAND RANGE.
- [SDR CA991112017](https://openairdocs.org/sdr/CA991112017.md): Actuator · failed · Nov 1, 1999 · Cessna 550
  > (CAN) ACTUATOR HAD EXCESSIVE DEAD BAND RANGE.
- [SDR UF6A980404](https://openairdocs.org/sdr/UF6A980404.md): Power Cable · failed · Apr 8, 1998 · N858AW · Bag ATP
  > FWA - FLT 5722 - POWER LEVER CONTROL INOP ON RIGHT SIDE. STANDBY CONTROLS OPERATE NORMALLY. MAINTENANCE REMOVED AND REPLACED NR 1 POWER CABLE. SYSTEM OPS CHECKED GOOD. (M)
- [SDR VTZA97582](https://openairdocs.org/sdr/VTZA97582.md): Control Box · failed · Oct 17, 1997 · N494UE · Bag JETSTM3201
  > FLT 6283 - IAD-HPN - DURING CRUISE, AIRCRAFT MADE A UNSCHEDULED LANDING DUE TO RT EGT FLUCTUATION WITH TTL/SRL ON/OFF NO EFFECT. MAINTENANCE INSPECTED AND OPENED DMI 49637, MEL 61-1 ON PROP SYN. MAINTENANCE CLOSED DMI 49637 ON 10-19-97 BY REMOVING AND REPLAC
- [SDR CA970722021](https://openairdocs.org/sdr/CA970722021.md): Flex Drive Shaft · corroded · Jul 15, 1997 · Cessna 550
  > (CAN) DURING TROUBLESHOOTING OF THE ENGINE SYNCHRONIZATION SYSTEM THE ACTUATOR FLEX DRIVE SHAFT WAS FOUND BROKEN INTO TWO PIECES AT APPROXIMATELY MID SPAN. THE CABLE WAS CORRODED WITH WATER PRESENT.
- [SDR M3HA97058](https://openairdocs.org/sdr/M3HA97058.md): Idle Gate Light · illuminated · Mar 31, 1997 · N4202G · Aerosp ATR42300
  > HNL - FLT 656 - PRIOR TO LANDING IN MKK, THE IDLE GATE FAIL LIGHT ILLUMINATED WITH SC AND CAP LIGHT, IT WAS ANOMALLY AND PROBLEM CLEARED ITSELF. INITIATED A GO AROUND WITH NO FURTHER PROBLEMS. AN UNEVENTFUL LANDING WAS MADE IN MKK. UPON RETURNING TO HNL, MX

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy
FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet'
WHERE jasc_code = '7601'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/jasc/7601/reports

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.