# JASC 3120: Independent Instruments

- Type: JASC system/component code (FAA)
- ATA chapter: 31 Instruments
- Title in the code table: INDEPENDENT INSTRUMENTS (CLOCK, ETC.)
- Service difficulty reports: 209
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=32
- Page: https://openairdocs.org/jasc/3120

## What it covers

The units which measures time, logs elapsed time of operation, or measures acceleration/deceleration forces. Typical parts are hour meter, pressure switch, line, etc.

## Service difficulty reports (209, newest 50)

- [SDR EVCA202602230001](https://openairdocs.org/sdr/EVCA202602230001), Feb 21, 2026: Bell 206L4. CLOCK. UNSERVICEABLE. A STEADY STREAM OF SMOKE WAS OBSERVED COMING FROM THE INSTRUMENT PANEL CLOCK. (N547AE)
- [SDR AALA202501160287](https://openairdocs.org/sdr/AALA202501160287), Jan 15, 2025: Boeing 737823. INDICATOR. INOPERATIVE. AIRCRAFT WAS NOT GROUNDED: NUMBER 2 ENGINE FUEL FLOW INDICATOR STOPPED WORKING SHORTLY AFTER TAKEOFF. **SUPPLEMENTAL REP (N815NN)
- [SDR AALA202306123148](https://openairdocs.org/sdr/AALA202306123148), Jun 9, 2023: Airbus A320232. CLOCK. FAILED. AIRCRAFT WAS NOT GROUNDED: DURING CRUISE STRONG ACRID ODOR FROM FIRST OFFICERS SIDE FLIGHT CONTROL UNIT WITH PLUME OF SM (N658AW)
- [SDR 2022FA0000619](https://openairdocs.org/sdr/2022FA0000619), Sep 14, 2022: Airbus A300*. NONE. NONE. HOBBS METER (PN 100690 / MODEL # 873 IB) ERRATIC, READS INCORRECTLY. (N3938A)
- [SDR 2022FA0000098](https://openairdocs.org/sdr/2022FA0000098), Feb 23, 2022: Airbus A300*. NONE. UNRELIABLE. HOBBS METER (PN: 100690 / MODEL #: 873 IB) UNRELIABLE. HOURS LAG FROM ACTUAL CHRONOMETER TIMEKEEPING. (N342R)
- [SDR 9JLA2021101230734](https://openairdocs.org/sdr/9JLA2021101230734), Oct 7, 2021: Beech 400A. CLOCK. INOPERATIVE. DURING POST FLIGHT CHECKS IT WAS DISCOVERED THAT THE PILOTS SIDE DIGITAL CLOCK WAS INOP. OPERATIONS WERE CONTINUED PER M (N345HC)
- [SDR 2WAA202104220084](https://openairdocs.org/sdr/2WAA202104220084), Mar 22, 2021: Doug MD83. INSTRUMENT PANEL. MULTIPLE FAIL. DURING ADVERSE WEATHER LOST MULTIPLE NAV GUIDANCE INSTRUMENTS, AUTO THROTLE AND AUTO PILOT, DECLARED EMERGENCY DIVERTED  (N806WA)
- [SDR QMLA2020050520018](https://openairdocs.org/sdr/QMLA2020050520018), May 2, 2020: Snias AS350B3. LIGHT. BURNED OUT. PILOT REPORTED A BURNT SMELL IN THE CABIN UPON APPROACH AND NOTICED THE CLOCK LIGHT HAD GONE OUT. UPON ARRIVAL AT THE AI (N490H)
- [SDR CA190805001](https://openairdocs.org/sdr/CA190805001), Aug 3, 2019: Bombdr BD1001A10. WARNING LIGHT. FALSE ACTIVATION. (CAN) STALL PROTECT FAIL AMBER CAS ILLUMINATED - DURING TAKEOFF ROLL AT AN INDICATED AIRSPEED OF 65 KNOTS WE GOT AN AMBE
- [SDR CA191003006](https://openairdocs.org/sdr/CA191003006), Jul 7, 2019: Cndair CL6002B19. INDICATOR. FAULTY. (CAN) DIVERTED DUE TO A STALL FAIL CAUTION MESSAGE IN CRUISE. CORRECTIVE ACTION: TROUBLESHOT STALL FAIL PER CRJ 200 FIM 
- [SDR AALA201906249010](https://openairdocs.org/sdr/AALA201906249010), Jun 21, 2019: Airbus A330243. DISPLAY. FAILED. AIRCRAFT NOT GROUNDED: PILOT REPORTS CPDLC FAILED BOTH DISPLAYS TURNED ORANGE, ATC WAS NOT RECEIVING INFORMATION FROM A/ (N288AY)
- [SDR AALA201901176005](https://openairdocs.org/sdr/AALA201901176005), Jan 16, 2019: Boeing 737823. CLOCK. FAILED. FLIGHT CREW REPORTED FAINT ELECTRICAL ODOR PRESENT. SUSPECT EXHAUST FAN OR SIMILAR STARTING TO FAIL. AIRCRAFT WAS TAKEN  (N834NN)
- [SDR CA180510011](https://openairdocs.org/sdr/CA180510011), May 9, 2018: Cndair CL6002C10. INDICATOR. FALSE ACTIVATION. (CAN) BLANK OUT ISI & STALL FAIL CAUTION, RUD LIMIT FAULT STATUS MSG APPEARED. ISI CB TRIPPED/RESET. OPS BACK TO NORMAL.
- [SDR 2018FA0000077](https://openairdocs.org/sdr/2018FA0000077), Mar 5, 2018: Urocop EC120B. DISPLAY. MALFUNCTIONED. RECEIVED A MODIFIED VEMD. AFTER INSTALLATION, AND INITIAL POWER UP, BOTH SCREENS DISPLAYED LANE FAILURE. (N146CB)
- [SDR 3SVA2017082200001](https://openairdocs.org/sdr/3SVA2017082200001), Aug 22, 2017: Cessna 441. HSI. SPINNING. DURING CLIMB OUT, COPILOTS HSI STARTED SPINNING RAPIDLY. RETURNED TO BASE. (N441DK)
- [SDR 6RXA20150923001](https://openairdocs.org/sdr/6RXA20150923001), Sep 12, 2015: Lear 45LEAR. CLOCK. DEFECTIVE. CLOCK, PILOT SIDE, CAUSING WARNING HORN AFTER TAKEOFF. (N617RX)
- [SDR CA150520013](https://openairdocs.org/sdr/CA150520013), May 14, 2015: Cndair CL6002D24. DISPLAY. FAILED. (CAN) ACFT RETURNED TO GATE FOR FO PFD DISPLAY SHOWING LINES AND ELECTRICAL ODOR PRESENT IN FLIGHT DECK. CONTRACT MAINTE
- [SDR CA150426001](https://openairdocs.org/sdr/CA150426001), Apr 25, 2015: Airbus A310300. INDICATOR. OVERHEATED. (CAN) APPROXIMATELY 5 MINUTES AFTER FULL ACFT ELECTRICAL POWER WAS APPLIED, THE RUDDER TRIM INDICATOR BEGAN EMMITING SMO
- [SDR CA140717004](https://openairdocs.org/sdr/CA140717004), May 28, 2014: Cndair CL2156B11215. CLOCK. FAILED. (CAN) DURING THE FLIGHT TESTS PRIOR DELIVERY, IT WAS DISCOVERED THAT THE DIGITAL CLOCK AFFECTED THE POWER SWITCHING RELA
- [SDR 2014FA0000059](https://openairdocs.org/sdr/2014FA0000059), Jan 15, 2014: Beech 58P. PUMP. INOPERATIVE. DURING AN ANNUAL INSPECTION, FOUND LEFT INSTRUMENT AIR PUMP INOPERATIVE. REMOVED PUMP, FOUND DRIVE COUPLING SHEARED. FOU (N58LP)
- [SDR CALA2013100291678](https://openairdocs.org/sdr/CALA2013100291678), Oct 2, 2013: Boeing 757222. HOUR METER. FAULTY. APU HOC ADVISORY. REPLACED APU HOUR METER IAW AMM, OPERATIONS CHECKED OKAY. (N589UA)
- [SDR DXTA2013043005366](https://openairdocs.org/sdr/DXTA2013043005366), Apr 30, 2013: Cessna 680CE. DISPLAY. INOPERATIVE. AS THE FLYING PILOT, SMELLED SMOKE AND SAW FLAGS ON THE STNDBY ATTITUDE INDICATOR. MY PARTNER SAW IT AT THE SAME TIME AN (N385QS)
- [SDR QMLA2013041513053](https://openairdocs.org/sdr/QMLA2013041513053), Apr 15, 2013: Bell 407. CLOCK. BURNED. DURING FLIGHT, PILOT NOTICED AND SMELLED SMOKE IN COCKPIT WHICH APPEARED TO BE COMING FROM THE CLOCK AREA. PILOT PERFORM (N408GA)
- [SDR UALA2013030601344](https://openairdocs.org/sdr/UALA2013030601344), Mar 6, 2013: Boeing 757222. CLOCK. INOPERATIVE. F/O CLOCK INOPERATIVE. DEFERRED FOR TIME PER MEL. REPLACED F/O'S CLOCK, OPS CHECK GOOD. (N590UA)
- [SDR CA130129003](https://openairdocs.org/sdr/CA130129003), Jan 25, 2013: Snias AS350*. BATTERY PACK. LEAKING. (CAN) ON A ROUTINE INSPCTION AN AME FOUND THE UNIT BATTERY PACK IN A VERY BAD CONDITION FOLLOWING BATTERY LEAKAGE ON THE
- [SDR UIEA2013011500013](https://openairdocs.org/sdr/UIEA2013011500013), Jan 15, 2013: Boeing 74748EF. CLOCK. INOPERATIVE. ON DESCENT, A BURNED ELECTRICAL ODOR ASSOCIATED WITH AN IDS DU STATUS MESSAGE WAS NOTICED ON THE FLIGHT DECK. UNABLE TO  (N419MC)
- [SDR 2013FA0000022](https://openairdocs.org/sdr/2013FA0000022), Jan 15, 2013: Raythn HAWKER800XP. DISPLAY. MALFUNCTIONED. WHEN ESSENTIAL BUSS POWER IS LOST, THE ELECTRONIC STANDBY INSTRUMENT (ESIS) REBOOTS AS IT SWITCHES TO BACKUP BATTERY POW (N519M)
- [SDR MASA2012122552370](https://openairdocs.org/sdr/MASA2012122552370), Dec 25, 2012: Cndair CL6002B19. DCU. MALFUNCTIONED. IAPS DEGRADED, ABORTED TAKEOFF. RESET DCU NR 2. (N27318)
- [SDR CA121120003](https://openairdocs.org/sdr/CA121120003), Nov 12, 2012: Beech 1900C. INDICATOR. DAMAGED. (CAN) DURING START, THE CREW NOTICED ELECTRICAL BURNING ODOR IN COCKPIT, START ABORTED WITH NO FURTHER PROBLEMS. MAINTEN
- [SDR DALA12011463149](https://openairdocs.org/sdr/DALA12011463149), Oct 25, 2012: Airbus A319114. CLOCK. INOPERATIVE. AFTER TAKEOFF, CLOCK WENT BLANK FOLLOWED BY AN ELECTRICAL ODOR. CIRCUIT BREAKERS N2 AND F11 WERE PULLED. ODOR THEN WENT  (N349NB)
- [SDR CHQA20121002366](https://openairdocs.org/sdr/CHQA20121002366), Oct 2, 2012: Emb EMB135KL. SWITCH. MALFUNCTIONED. CREW REPORTED THAT DURING FLIGHT, AND ELECTRICAL ODOR WAS PRESENT IN THE COCKPIT. THE CREW DIVERTED TO CLE AND LANDED WI (N376SK)
- [SDR CA120315005](https://openairdocs.org/sdr/CA120315005), Mar 13, 2012: Frchld SA227DC. EFIS. FAILED. (CAN) THE F/O WAS GETTING CLEARANCE WHILE THE CAPTAIN WAS OUTSIDE. THE CAPTAIN CAME INTO THE COCKPIT AND SMELLED THE BUR
- [SDR HALA2011100900443](https://openairdocs.org/sdr/HALA2011100900443), Oct 9, 2011: Boeing 7673G5. MONITOR. INOPERATIVE. ETOPS SIGNIFICANT SYS -NO FLOW BALLS SHOWING DURING TEST OF THE E/E COOLING MONITOR ON VOR-L AND FMCDU-L (IN FLIGHT). UP (N586HA)
- [SDR CA110830013](https://openairdocs.org/sdr/CA110830013), Aug 24, 2011: Frchld SA227CC. INDICATOR. INTERMITTENT. (CAN) PILOT ABORTED TAKEOFF, WAS NOT ABLE TO GET MORE THAT 35 PERCENT TORQUE ON THE RT ENGINE. MX REPLACED THE FOLLOWING
- [SDR JBZA08262011TB](https://openairdocs.org/sdr/JBZA08262011TB), Aug 21, 2011: Urocop EC135P2. RESISTOR. BURNED OUT. AFTER TURNING ON THE MASTER BATTERY SWITCH AS WELL AS THE ACFT FADEC (2) SWITCHES, NURSE SITTING IN THE CO-PILOTS SEAT P (N37RX)
- [SDR UALA2011081504324](https://openairdocs.org/sdr/UALA2011081504324), Aug 13, 2011: Boeing 757222. CLOCK. FAULTY. CAPTAIN'S CLOCK IS FAULTY. DOES NOT MATCH F/O'S. PART NEEDED 480-0342 NOT STOCKED SEAMM. REPLACED CAPT CHRONO. CHECKS OK (N588UA)
- [SDR UALA2011072103706](https://openairdocs.org/sdr/UALA2011072103706), Jul 20, 2011: Boeing 757222. CLOCK. OUT OF TOLERANCE. FIRST OFFICERS CLOCK IS OUT OF TOLERANCE. REMOVED CLOCK AND INSTALLED CHRONOMETER, CHECKED OKAY. (N598UA)
- [SDR C8GA2011000011](https://openairdocs.org/sdr/C8GA2011000011), Jul 13, 2011: Boeing 727223. WARNING HORN. FALSE ACTIVATION. DURING TAKEOFF ROLL, THE TAKEOFF WARNING SYS HORN SOUNDED. THE ACFT GROUND SPEED DID NOT EXCEED 20 KNOT. THE ACFT RETURN (N898AA)
- [SDR UALA2011020300583](https://openairdocs.org/sdr/UALA2011020300583), Feb 2, 2011: Boeing 767322. INDICATOR. FAULTY. RUDDER TRIM IND 5 UNITS LT WING- EICAS IND ZERO TRIM. AFTER CLIMB ALL INDICATIONS RETURNED TO NORMAL. VERIFIED WITH CREW (N647UA)
- [SDR UALA2011012400381](https://openairdocs.org/sdr/UALA2011012400381), Jan 22, 2011: Boeing 757222. LIGHT. INOPERATIVE. RT ENGINE OVERHEAT LIGHT INOPERATIVE. REPLACED RT ENG OVERHEAT LIGHT BASE ASSY AND OP CHECKED IAW MM. TEST PASSED. (N596UA)
- [SDR C8GA201000013](https://openairdocs.org/sdr/C8GA201000013), Jul 30, 2010: Boeing 727227. SWITCH. FAULTED. DURING TAKEOFF ROLL WITH THE ACFT BELOW 60 KNOTS THE TAKEOFF WARNING HORN SOUNDED. TAKEOFF WAS ABORTED WITHOUT INCIDENT  (N89427)
- [SDR UALA2010071202461](https://openairdocs.org/sdr/UALA2010071202461), Jul 10, 2010: Boeing 777222. INDICATOR. FAULTY. RUDDER TRIM SCALE EXTREMELY DIM. REPLACED RUDDER TRIM IND. SYS GROUND CHECKS NORMAL. (N213UA)
- [SDR CA100826005](https://openairdocs.org/sdr/CA100826005), Jun 15, 2010: Pilats PC1247. CONTROL LEVER. INTERMITTENT. JOYSTICK ON MFD CONTROLLER INTERMITTENT. CONTROL PANEL ASSY REPLACED.
- [SDR YAA2010F00002](https://openairdocs.org/sdr/YAA2010F00002), Apr 27, 2010: Cessna 207A. CLOCK. SMOKE. PILOT REPORTS THAT ON FINAL, HE HAD SWITCHED ON THE PANEL LIGHTS AND STARTED HAVING A FAINT SMELL OF SMOKE IN THE CABIN. (N755AB)
- [SDR CHQA201000051](https://openairdocs.org/sdr/CHQA201000051), Mar 2, 2010: Emb EMB145LR. UNKNOWN. MALFUNCTIONED. CREW RECEIVED ATT: CAGE MESSAGE ON ISIS IN FLIGHT. IN STABLE FLIGHT THE CREW TRIED TO RESET PER QRH AND FAILED TO GET AT (N258JQ)
- [SDR AALA20100216LGW01](https://openairdocs.org/sdr/AALA20100216LGW01), Feb 15, 2010: Boeing 777223. UNKNOWN. MALFUNCTIONED. CREW REPORTED COMPLETE BLACKOUT OF THE MAIN FLIGHT DECK INSTRUMENTS TWICE FOR TWO SECONDS DURING AN EIGHT MINUTE PERIOD. (N793AN)
- [SDR SWIA201023386](https://openairdocs.org/sdr/SWIA201023386), Jan 1, 2010: Cndair CL6002B19. UNKNOWN. MALFUNCTIONED. ON APPROACH, NUMEROUS COCKPIT INSTRUMENT WARNINGS AND FLAGS DISPLAYED, EMERGENCY DECLARED. (FLT 6830) POWERED DOWN AIRCR (N507CA)
- [SDR DXTA2009121803900](https://openairdocs.org/sdr/DXTA2009121803900), Dec 17, 2009: Cessna 560XL. INDICATOR. OUT OF TOLERANCE. PITCH TRIM INDICATOR OUT OF CALIBERATION . ACFT FEELS TAIL HEAVY DURING TAKEOFF WITH TRIM INDICATOR IN TAKE OFF RANGE. A (N692QS)
- [SDR YENA20090914113](https://openairdocs.org/sdr/YENA20090914113), Sep 14, 2009: Emb ERJ190100IGW. PROCESSOR. ODOR. FLT 75 SYR-JFK - F1 NOTED A STRONG BURNING BATTERY ODOR SOON AFTER T/O. TURNED OFF THE (PRA) ODOR WENT AWAY. OPERATED (P (N249JB)
- [SDR UALA2009032700915](https://openairdocs.org/sdr/UALA2009032700915), Mar 26, 2009: Boeing 737322. UNKNOWN. FAILED. F/O'S INSTRUMENTS FAILED INFLIGHT WITH SEVERAL OTHER FAILURES OF SYSTEMS. AC DIVERTED TO PIT. (N328UA)

All 209: https://openairdocs.org/jasc/3120/reports.md

## Other codes in chapter 31

- [JASC 3100](https://openairdocs.org/jasc/3100): Indicating/Recording System (382 reports)
- [JASC 3110](https://openairdocs.org/jasc/3110): Instrument Panel (338 reports)
- [JASC 3130](https://openairdocs.org/jasc/3130): Data Recorders (Flight/Maintenance) (126 reports)
- [JASC 3140](https://openairdocs.org/jasc/3140): Central Computers (619 reports)
- [JASC 3150](https://openairdocs.org/jasc/3150): Central Warning (3,980 reports)
- [JASC 3160](https://openairdocs.org/jasc/3160): Central Display (1,317 reports)
- [JASC 3170](https://openairdocs.org/jasc/3170): Automatic Data (20 reports)
- [JASC 3197](https://openairdocs.org/jasc/3197): Instrument System Wiring (202 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.