# JASC 2197: Air Conditioning System Wiring

- Type: JASC system/component code (FAA)
- ATA chapter: 21 Air Conditioning
- Title in the code table: AIR CONDITIONING SYSTEM WIRING
- Service difficulty reports: 497
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=17
- Page: https://openairdocs.org/jasc/2197

## What it covers

For reports indicating a problem with wiring specific to the Air Conditioning System.

## Service difficulty reports (497, newest 50)

- [SDR CALA2026101920438](https://openairdocs.org/sdr/CALA2026101920438), Oct 15, 2026: Boeing 7879. ELEC CONNECTOR. DETACHED. ACRID SMELL IN ACFT. AFTER ENGINE SHUTDOWN, VISIBLE SMOKE IN CABIN. ACCOMPLISH SMOKE OR FUMES IN CABIN FIM TASK DMC-B787 (N25982)
- [SDR UIEA2026100400944](https://openairdocs.org/sdr/UIEA2026100400944), Oct 2, 2026: Boeing 74747UF. PCB. DAMAGED. EQUIPMENT COOLING EICAS CAUTION F270 ON CLIMB. CAPT ND BLANK FOR 30", FO PFD FLICKERED ON CLIMB. MESSAGE BLANKED THEN LO (N408MC)
- [SDR HYIA20260917003](https://openairdocs.org/sdr/HYIA20260917003), Sep 16, 2026: Tecnam P2012. SWITCH. ARCED. PILOT REPORTED THE CABIN HEATER WOULD NOT BLOW AND THERE WAS A STRONG ODOR ASSOCIATED WITH THE HEATER. MAINTENANCE INSPE (N965CA)
- [SDR QMLA2026080920052](https://openairdocs.org/sdr/QMLA2026080920052), Aug 8, 2026: Urocop EC130B4. ELEC CONNECTOR. BURNED. ON APPROACH PILOT AND CREW DETECTED FAINT ELECTRICAL SMELL NO SMOKE PRESENT. AMT DISCOVERED 1 EACH MOLEX CONNECTER WITH  (N910U)
- [SDR 3EJA869JS060926](https://openairdocs.org/sdr/3EJA869JS060926), Jun 9, 2026: Cessna 560XL. CONTACTOR. DIRTY. AFTER ADVANCING TO TAKE OFF POWER GOT A BIG RUSH OF AIR AND A ACM OVERHEAT WITH MASTER CAUTION. CLEANED CONTACTOR FOLLOW (N869JS)
- [SDR KC8A20260410003](https://openairdocs.org/sdr/KC8A20260410003), Apr 10, 2026: Amd FALCON20F5. ELEC CONNECTOR. SHORTED. LOSS OF PRESSURIZATION DURING CLIMB OUT OF KBHM, CABIN WARNING LIGHT ILLUMINATED ACCOMPANIED BY THE AURAL WARNING, NO RE (N47LP)
- [SDR CALA2026033014903](https://openairdocs.org/sdr/CALA2026033014903), Mar 27, 2026: Boeing 737924ER. ELEC CONNECTOR. DISCONNECTED. DUE TO EMERGENCY DECLARED FOR LOW CABIN PRESSURE PLEASE VERIFY BLEED PRESSURES WITH ENGINES RUNNING. REFERENCE 8341812 L (N63890)
- [SDR ABXA20260324128](https://openairdocs.org/sdr/ABXA20260324128), Mar 24, 2026: Boeing 767341. WIRE. SHORTED. DURING TAXI, FWD EQUIPMENT VALAVE EICAS MESSAGE AFTER 2ND ENGINE START. VALVE LIGHT REMAINED ON AFTER COMPLETING QRH, A/ (N760CK)
- [SDR SWAA2026032482022](https://openairdocs.org/sdr/SWAA2026032482022), Mar 21, 2026: Boeing 7378. CIRCUIT BREAKER. FAULTED. PUSHED OFF GATE, EQUIPMENT COOLING SUPPLY SIDE OFF LIGHT ILLUMINATED. RETURN TO GATE . FLIGHT DECK CREW SMELLED A BURNIN (N8845L)
- [SDR ABXA20260128034](https://openairdocs.org/sdr/ABXA20260128034), Jan 28, 2026: Boeing 767232. CIRCUIT CARD. DEFECTIVE. DURING TAXI OUT, FWD EQUIP VALVE MSG ILLUMINATED. AIRCRAFT RETURNED TO BLOCKS (BTB). REMOVED & REPLACED EQUIP COOLING IN (N745AX)
- [SDR QMLA2026012420004](https://openairdocs.org/sdr/QMLA2026012420004), Jan 21, 2026: Bolkms BK117C2. ELEC CONNECTOR. DISCONNECTED. VERY LOW HEAT IN CABIN & COCKPIT CAUSING MED CREW TO CANCEL PATIENT TRANSPORT. FOUND DISCONNECTED ELECTRICAL CONNECTOR O (N635TJ)
- [SDR DALA2025122409404](https://openairdocs.org/sdr/DALA2025122409404), Dec 22, 2025: Boeing 757232. CIRCUIT BOARD. FAILED. PRESS/DE- DUE TO LOSS OF BOTH PACKS CAUSING PRESSURIZATION LOSS AND OXYGEN MASKS DEPLOYED. REPLACED RT FLOW CONTROL CARD (N699DL)
- [SDR DXTA2025102005328](https://openairdocs.org/sdr/DXTA2025102005328), Oct 15, 2025: Cessna 560XL. WIRE HARNESS. DEFECTIVE. AT FL410 AND JUST PULLED THE POWER BACK FROM A CRUISE SETTING. WHEN THE POWER WAS PULLED BACK THE LEFT ENGINE ITT WENT T (N580QS)
- [SDR HYIA20251010001](https://openairdocs.org/sdr/HYIA20251010001), Oct 8, 2025: Cessna 402C. SWITCH. SHORTED. PILOT REPORTED THE AUXILIARY CABIN FAN SWITCH FELT HOT WITH A BURNING SMELL AND NOTED SPARKS. COMPANY MAINTENANCE INSPEC (N223PB)
- [SDR AALA202508086629](https://openairdocs.org/sdr/AALA202508086629), Aug 6, 2025: Airbus A319112. CIRCUIT BREAKER. CLOSED. AIRCRAFT WAS NOT GROUNDED: ON CLIMB OUT FROM KEUG THE AIRCRAFT WOULD NOT PRESSURIZE CORRECTLY. AIRCRAFT WAS PARTIALLY PR (N753US)
- [SDR UIEA2025062500801](https://openairdocs.org/sdr/UIEA2025062500801), Jun 25, 2025: Boeing 7474H6F. CONNECTOR. DAMAGED. PACK 1 EICAS ADVISORY MESSAGE AFTER TAKEOFF. ORH 224 DID NOT CORRECT PACK 1 SELECTED OFF. PACK 1 STATUS AFTER RETURN TO  (N431GT)
- [SDR DALA2025061804588](https://openairdocs.org/sdr/DALA2025061804588), Jun 14, 2025: Airbus BD5001A10. CIRCUIT BREAKER. TRIPPED. AFTER C/B CDC5-7-6 TRIPPED, FA REPORTED BURNING PLASTIC SMELL FUMES IN AFT GALLEY. FUMES DISSIPATED AFTER AFT GALLEY HEA (N136DQ)
- [SDR HNAA2025052900373](https://openairdocs.org/sdr/HNAA2025052900373), May 29, 2025: Emb EMB145LR. CONTACTOR. BURNED. ELECTRICAL -SOLDERING SMELL IN PASSENGER DOOR/FLIGHT DECK DOOR AREA OF AIRCRAFT. INSPECTED AND FOUND RECIRC FAN 2 CONTAC (N691AE)
- [SDR 2025F00124](https://openairdocs.org/sdr/2025F00124), May 10, 2025: Cndair CL6002B19. WIRE. DAMAGED. FLIGHT 1611 LPB TO SLCB: PRESSURIZATION L PACK HI PRESS FOLLOWED BY ALTITUDE WARNING MESSAGE AND OXYGEN MASKS DEPLOYED A
- [SDR AALA202504099541](https://openairdocs.org/sdr/AALA202504099541), Apr 6, 2025: Boeing 737823. ELEC CONNECTOR. BACKED OUT. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: WHILE ON FINAL APPROACH, THE FLIGHTDECK SUDDENLY GOT VERY WARM  (N932NN)
- [SDR YENA2025040200351](https://openairdocs.org/sdr/YENA2025040200351), Mar 31, 2025: Airbus A320232. WIRE. BURNED. FLT#765, JFK-GCM. 'IN-FLT REPORTED AN ELECTRICAL BURNING SMELL BETWEEN ROWS 9-10 DEF. SMELL DISSIPATED ONCE IFE SYSTEM W (N766JB)
- [SDR NACA20250717007](https://openairdocs.org/sdr/NACA20250717007), Mar 29, 2025: Boeing 767323. CONNECTOR. CHAFED. AFTER REMOVAL OF PANEL 193FL FOUND LT LOWER TRIM AIR SUPPLY VALVE POSITIONED INCORRECTLY CONNECTOR PLUG HARD CHAFING ON  (N379CX)
- [SDR ELYA03182025002](https://openairdocs.org/sdr/ELYA03182025002), Mar 18, 2025: Tecnam P2012. TERMINAL. MELTED. COMBUSTION HEATER SWITCH WIRE TERMINAL OVERHEATED AND MELTED INTO SWITCH BODY. (N260AR)
- [SDR MJYA2025031400061](https://openairdocs.org/sdr/MJYA2025031400061), Mar 15, 2025: Doug DC915. CONNECTOR. DAMAGED. WHILE CRUISING AT FL350 A MASTER WARNING LIGHT ILLUMINATED, THE CABIN PRESSURE LIGHT WAS ALSO ILLUMINATED. BOTH THE CAPT (N783TW)
- [SDR NACA2025031100008](https://openairdocs.org/sdr/NACA2025031100008), Mar 11, 2025: Boeing 767323. WIRE. DAMAGED. PERFORM PACK CONTROLLER STANDBY BITE FOUND L NO GO LAMP ON WHEN TURN THE TEST SWITCH TO POSITION 7. REPLACED LH PACK LOW (N321CM)
- [SDR NACA2025041401](https://openairdocs.org/sdr/NACA2025041401), Mar 11, 2025: Boeing 767323. WIRE. FAULTED. PERFORM AIR SUPPLY BITE FOUND R FAN BITE SWITCH AND WIRE FAULT. (N321CM)
- [SDR MJYA20250314001](https://openairdocs.org/sdr/MJYA20250314001), Feb 19, 2025: Doug DC915F. ELEC CONNECTOR. DAMAGED. WHILE CRUISING AT FL350 A MASTER WARNING LIGHT ILLUMINATED, THE CABIN PRESSURE LIGHT WAS ALSO ILLUMINATED. BOTH THE CAPT (N783TW)
- [SDR CALA2024121701556](https://openairdocs.org/sdr/CALA2024121701556), Dec 14, 2024: Boeing 7378. WIRE. SHORTED. LH PACK LIGHT. RESET PACK LIGHT RETURNED.THE FOLLOWING AIR/GND RELATED MSG'S ALL REPORTED AGAIN INBOUND, 21-55340, 21-55 (N27274)
- [SDR 6CBA2024111524001](https://openairdocs.org/sdr/6CBA2024111524001), Nov 14, 2024: Pilats PC1247E. CONTACTOR. BURNED. IN CRUISE FLT, CREW & PAX BECAME AWARE OF A BURNING PLASTIC SMELL IN COCKPIT & CABIN. CAPT REPORTED DID NOT SEE ANY SMOK (N923AF)
- [SDR QXEA2024101400239](https://openairdocs.org/sdr/QXEA2024101400239), Oct 13, 2024: Emb ERJ170200LR. ELEC CONNECTOR. LOOSE. FLIGHT 2117. XBLD VALVE FAILED TO OPEN AFTER TAKEOFF. RENDERED PACK 1 OFF. DUE TO MEL AND FORCASTED ICE. DIVERTED AND AC (N655QX)
- [SDR DALA2024091609043](https://openairdocs.org/sdr/DALA2024091609043), Sep 10, 2024: Airbus BD5001A10. WIRE HARNESS. DAMAGED. AFTER LANDING ON TAXI IN 36 R BLEED FAIL - R PRESS REG SOV INOP. ALSO SMELLED "BURNT SOCK ODOR". RT BLEED FAIL ADDRESSED (N121DU)
- [SDR 2024F00186](https://openairdocs.org/sdr/2024F00186), Aug 4, 2024: Cndair CL6002B19. WIRE. CHAFED. OVBD COOL CAUTION MESSAGE WITH OVBD FAIL STATUS MESSAGE. AIRCRAFT PERFORMED QRF CBB/ORU/CBB. CORRECTIVE ACTION: WAS REPL (N545AV)
- [SDR QMLA2024072620091](https://openairdocs.org/sdr/QMLA2024072620091), Jul 26, 2024: Pilats PC1245. CIRCUIT BREAKER. TRIPPED. WE TOOK OFF ON A FLIGHT TO A SENDING FACILITY TO PICK UP A PATIENT. DURING CLIMB OUT, THE 'BUS TIE' CIRCUIT BREAKER TRIP (N637PC)
- [SDR DALA2024071607204](https://openairdocs.org/sdr/DALA2024071607204), Jul 16, 2024: Boeing 757251. WIRE. BROKEN. SHIP 5650 -DIV/PRES/DE- TO STL DUE TO LOSS OF BOTH PACKS REQUIRING EMERGENCY DECENT. OXYGEN MASKS DEPLOYED. CORRECTIVE A (N550NW)
- [SDR K11A2024070800265](https://openairdocs.org/sdr/K11A2024070800265), Jun 27, 2024: Boeing 737375. CONNECTOR. BROKEN. CABIN ALTITUDE WARNING HORN AND LIGHT CAME ON DURING FLIGHT @ FL 360. LEFT BLEED WAS SHOWING 12 PSI AND RIGHT BLEED WAS  (N332CK)
- [SDR QMLA2024070120079](https://openairdocs.org/sdr/QMLA2024070120079), Jun 27, 2024: Urocop EC130B4. CONNECTOR. BROKEN. SHORTLY AFTER TAKEOFF WHILE IN CRUSE FLIGHT AC STARTED BLOWING HOT AIR. NOTED AC LIGHT WAS STILL ON WITH LOWER THEN NORM (N133H)
- [SDR CALA2024060501699](https://openairdocs.org/sdr/CALA2024060501699), May 29, 2024: Boeing 737824. CONNECTOR. LOOSE. PRESS PANEL HAS AUTO FAIL AND ALTN LIGHT ILLUMINATED REQUEST MEL FOR AUTO 2 CONT FAULT. DDP COMPLIED WITH. TOMC APPROVED (N87527)
- [SDR 3EJA2024061300724](https://openairdocs.org/sdr/3EJA2024061300724), May 17, 2024: Cessna 525B. PCB. DEFECTIVE. DURING THE CLIMB AT 23,000 I STARTED TO FEEL THE AFFECTS OF HYPOXIA WITH NO CABIN ALTITUDE WARNING. AFTER EMERGENCY DESC (N794JS)
- [SDR NACA2024051000004](https://openairdocs.org/sdr/NACA2024051000004), May 10, 2024: Boeing 7673BG. CONNECTOR. CRACKED. FOUND LH PACK COMPRESSOR OH SWITCH CONNECTOR D01576 CRACKED. REMOVED AND REPLACED CONNECTOR D01576 IAW SWPM 20-61-00 (N563NC)
- [SDR NACA2024051000003](https://openairdocs.org/sdr/NACA2024051000003), May 10, 2024: Boeing 7673BG. CONNECTOR. DAMAGED. REMOVED AND REPLACED RH PACK COMPRESSOR O/H SWITCH CONNECTOR @1562 BACKSHELL CLAMP IAW SWPM 21-61-11 (N563NC)
- [SDR IPXA2024030475640](https://openairdocs.org/sdr/IPXA2024030475640), Mar 3, 2024: Doug MD11F. BUSS. INOPERATIVE. DURING PREFLIGHT,€?CRG FLO FWD DISAG€?, THEN €ŒFCC 2A DATA FAULT€?, AIR SYSTEM ALERTS, NO COMM 2 OR 3 AND BUS R EMER (N291UP)
- [SDR F3LA2023110100198](https://openairdocs.org/sdr/F3LA2023110100198), Oct 28, 2023: Airbus A320251N. UNKNOWN. UNKNOWN. AIRCRAFT WAS GROUNDED DO TO AN SDR REPORTABLE EVENT. REFERENCE LP 302819 OPERATIONAL FLIGHT CHECK UNSATISFACTORY. FOUND  (N363FR)
- [SDR CALA2023100402937](https://openairdocs.org/sdr/CALA2023100402937), Sep 30, 2023: Airbus A319131. WIRE. DAMAGED. VENT EXTRACT FAULT ECAM AEVC TEST SHOWS EXTRACT FAN 18HQ FAULT -- PANEL 123VU C/B AE2 BREAKER OUT FOR EXTRACT FAN, RESET (N855UA)
- [SDR ASAA2023071043983](https://openairdocs.org/sdr/ASAA2023071043983), Jul 10, 2023: Boeing 737890. CONNECTOR. DAMAGED. FOUND DAMAGED BACKSHELL CONNECTOR ON ELACT 1 J3 OF OUTFLOW VALVE. GROUNDED - YES. REMOVED AND REPLACED OUTFLOW VALVE ASS (N559AS)
- [SDR AALA202305169498](https://openairdocs.org/sdr/AALA202305169498), May 13, 2023: Boeing 737823. WIRE. BROKEN. AIRCRAFT WAS GROUNDED: WHILE CLIMBING TO FL360 CABIN ALTITUDE / DIFFERENTIAL PRESSURE PASSING 32000 WAS 8.95 PSI AND CAB (N848NN)
- [SDR SWAA2023042842141](https://openairdocs.org/sdr/SWAA2023042842141), Apr 26, 2023: Boeing 7377BD. CIRCUIT BREAKER. OVERHEATED. LEFT PACK ONLY HOT AIR. BURNING SMELL IN COCKPIT<[01] FOUND AIR CONDITIONING OVERHEAT BREAKER OUT; RESET BREAKER.RAN AND (N7720F)
- [SDR 2023F00118](https://openairdocs.org/sdr/2023F00118), Feb 26, 2023: Gulstm GIV. CONNECTOR. FAILED. LOSS OF CABIN PRESSURE AT FL450 ENROUTE FROM MYNN TO KHPN. CREW DECLARED AN EMERGENCY, PERFORMED EMERGENCY DECENT AND DI (N171JC)
- [SDR NACA2023012620001](https://openairdocs.org/sdr/NACA2023012620001), Jan 22, 2023: Boeing 767323. CONNECTOR. UNSECURE. RIGHT PACK OFF LIGHT WOULD NOT ILLUMINATE WHEN OFF. CLEANED AND RESECURED CANNON PLUG ON RH FLOW CONTROL AND SHUTOFF VAL (N321CM)
- [SDR SWAA2022120677988](https://openairdocs.org/sdr/SWAA2022120677988), Dec 2, 2022: Boeing 73779P. GROUND WIRE. FAILED. BOTH AUTO PRESSURIZATION CONTROLLERS FAILED, PRESSURIZATION NOT CONTROLLABLE IN MANUAL MODE. R & R AFT OUTFLOW VALVE IAW (N7820L)
- [SDR ABXA20221014113](https://openairdocs.org/sdr/ABXA20221014113), Oct 14, 2022: Boeing 767231. CONNECTOR. DIRTY. ON TAXI OUT THE FWD EQIP VAL EICAS MSG CAME ON, AFTER GOING TO STANDBY THE MSG REMAINED ON. AICRAFT BACK TO BLOCK AND GR (N651GT)

All 497: https://openairdocs.org/jasc/2197/reports.md

## Other codes in chapter 21

- [JASC 2100](https://openairdocs.org/jasc/2100): Air Conditioning System (1,354 reports)
- [JASC 2110](https://openairdocs.org/jasc/2110): Cabin Compressor System (252 reports)
- [JASC 2120](https://openairdocs.org/jasc/2120): Air Distribution System (15,352 reports)
- [JASC 2121](https://openairdocs.org/jasc/2121): Air Distribution Fan (4,373 reports)
- [JASC 2130](https://openairdocs.org/jasc/2130): Cabin Pressure Control System (3,453 reports)
- [JASC 2131](https://openairdocs.org/jasc/2131): Cabin Pressure Controller (2,041 reports)
- [JASC 2132](https://openairdocs.org/jasc/2132): Cabin Pressure Indicator (94 reports)
- [JASC 2133](https://openairdocs.org/jasc/2133): Pressure Regulator/Outflow Valve (1,711 reports)
- [JASC 2134](https://openairdocs.org/jasc/2134): Cabin Pressure Sensor (40 reports)
- [JASC 2140](https://openairdocs.org/jasc/2140): Heating System (1,020 reports)
- [JASC 2150](https://openairdocs.org/jasc/2150): Cabin Cooling System (12,383 reports)
- [JASC 2160](https://openairdocs.org/jasc/2160): Cabin Temperature Control System (3,039 reports)
- [JASC 2161](https://openairdocs.org/jasc/2161): Cabin Temperature Controller (308 reports)
- [JASC 2162](https://openairdocs.org/jasc/2162): Cabin Temperature Indicator (69 reports)
- [JASC 2163](https://openairdocs.org/jasc/2163): Cabin Temperature Sensor (154 reports)
- [JASC 2170](https://openairdocs.org/jasc/2170): Humidity Control System (1,332 reports)

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