# JASC 2100: Air Conditioning System

- Type: JASC system/component code (FAA)
- ATA chapter: 21 Air Conditioning
- Title in the code table: AIR CONDITIONING SYSTEM
- Service difficulty reports: 1,354
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=15
- Page: https://openairdocs.org/jasc/2100

## What it covers

For miscellaneous parts that cannot be associated with specific air conditioning, pressurization, or distribution codes. Examples are lines, hoses, etc., with no reference to the specific using system on the incoming report. Also, for those units and components furnishing a means of pressurizing, heating, cooling, moisture controlling, filtering, and treating the air used to ventilate areas of the fuselage within the pressure vessel.

## Service difficulty reports (1,354, newest 50)

- [SDR CALA2026101920449](https://openairdocs.org/sdr/CALA2026101920449), Oct 14, 2026: Boeing 767424ER. VALVE. FAULTED. FWD EQPT VALVE CAUTION MSG ON CLIMB OUT. TRIED TO CLOSE FWD EQUIP VAL PER FLIGHT MANUAL NON-NORMAL 2.20.45 VALVE AND MES (N67052)
- [SDR ABXA20260920416](https://openairdocs.org/sdr/ABXA20260920416), Sep 20, 2026: Boeing 767306. VALVE. MALFUNCTIONED. FWD EQUIPMENT VALVE EICAS AFTER LANDING. MTC PERFORMED OPERATION TEST OF EQUIPMENT COOLING PER AMM 21-58-00 OPS CHECK GO (N1427A)
- [SDR 2026FA0000737](https://openairdocs.org/sdr/2026FA0000737), Sep 17, 2026: Beech B200GT. EVAPORATOR. LEAKING. WATER DISCOVERED POOLING IN LOW AREAS UNDER FLOOR LEADING TO WETTING OF INSULATION, CLOGGING OF EVAPORATOR DRAINS, AND P
- [SDR ASAA2026091168670](https://openairdocs.org/sdr/ASAA2026091168670), Sep 11, 2026: Boeing 737990ER. CONVERTER. FAULTED. DURING DEPT FLIGHT DECK ONLY HAD MILD OIL SMELL. WENT AWAY AT AROUND 5000'. AGAIN DESCENDING THROUGH APPROX 5000' STRONG (N494AS)
- [SDR CALA2026083119028](https://openairdocs.org/sdr/CALA2026083119028), Aug 26, 2026: Boeing 757324. A/C PACK. MALFUNCTIONED. LEFT PACK OFF LIGHT NOT LIGHT DURING L ENG START. SMELL OF FUEL, POST START WITH PACK OFF. REF TO LP 3111827 FOR WORK PE (N57855)
- [SDR 141A2026080400001](https://openairdocs.org/sdr/141A2026080400001), Aug 4, 2026: Cessna 208B. CIRCUIT BREAKER. TRIPPED. LEFT VENT BLOWER CIRCUIT BREAKER POPPED OUT. SMELL OF SMOKE IN COCKPIT. DID A GATE RETURN. (N1983X)
- [SDR DXTA2026072708974](https://openairdocs.org/sdr/DXTA2026072708974), Jul 23, 2026: Bombdr BD1001A10. BYPASS VALVE. FAULTED. ON CLIMB OUT FROM KLAS PASSING 10,000FT WE GOT AN AMBER EMERGENCY EXIT CAS MSG. LEVELED OFF AT 12,000FT & RAN THE QRH CH (N790QS)
- [SDR DALA2026071604195](https://openairdocs.org/sdr/DALA2026071604195), Jul 15, 2026: Airbus BD5001A11. OIL SYSTEM. OVERSERVICED. BRIEF BURN LIKE ODOR SMELLED THROUGHOUT AIRCRAFT, STRONGER IN BACK OF AIRPLANE. STARTED JUST AFTER ROTATION, DISSIPATED  (N330DU)
- [SDR NI6R202606190066](https://openairdocs.org/sdr/NI6R202606190066), Jun 18, 2026: Gulstm 690C. REGULATOR VALVE. STUCK. DURING FLT, SMOKE IN CABIN, DURING SLOW CRUISE FLT OVER FIRE TRAFFIC AREA, PERFORMED QRH ITEMS, REMOVED SMOKE FROM CABIN (N840TW)
- [SDR CALA2026061617126](https://openairdocs.org/sdr/CALA2026061617126), Jun 14, 2026: Boeing 7879. BPCU. FAULTED. CREW RETURNED TO THE FIELD FOR A STRONG ELECTRICAL ODOR COMING FROM THE VENTS LOCATED FROM BACK OF FIRST CLASS TO MIDDLE (N26970)
- [SDR AALA202604243410](https://openairdocs.org/sdr/AALA202604243410), Apr 23, 2026: Boeing 737823. AIR DUCT. CONTAMINATED. AIRCRAFT WAS GROUNDED: AIR FROM GASPERS ON FLIGHT DECK SMELLS LIKE DIRTY SOCK. FLIGHT ATTENDANTS SMELLED IT DURING TAKEO (N928NN)
- [SDR 4TXA2026050700324](https://openairdocs.org/sdr/4TXA2026050700324), Apr 19, 2026: Boeing 7374B7. CONTROL MODULE. INTERMITTENT. INTERMITTENT WARNING HORN CABIN ALTITUDE LIGHT ILLUMINATED FL 270 CAB ALTITUDE SHOWING 11000 FT. FOLLOWED QRH AND LANDED (N802TJ)
- [SDR IXX2026F00008](https://openairdocs.org/sdr/IXX2026F00008), Apr 10, 2026: Boeing 767338. BLOCK. CRACKED. R/H ECS BAY EXHAUST PHENOLIC BLOCK IS BROKEN. (N313AZ)
- [SDR ABXA20260331140](https://openairdocs.org/sdr/ABXA20260331140), Mar 31, 2026: Boeing 767341. WARNING MESSAGE. ILLUMINATED. DURING TAXI OUT AND ENGINE START, FWD EQPT VALVE EICAS AFTER START LIGHT REMAINED ILLUMINATED WITH SWITCH IN STBY. CHECK (N760CK)
- [SDR CALA2026031814641](https://openairdocs.org/sdr/CALA2026031814641), Mar 16, 2026: Airbus A319131. SOLENOID. CORRODED. PRESURIZATION SYS V/S FLUCTUATES + - 800FT CONSTANTLY CONSTANT LY IN FLIGHTCAPT REPORTS THE V/S FT/MN INDICATION ON CAB  (N839UA)
- [SDR YENA2026021800219](https://openairdocs.org/sdr/YENA2026021800219), Feb 16, 2026: Airbus A320232. ECS. CONTAMINATED. FLT 968, PBI-HPN. CABIN/COCKPIT FUMES MOMENTARILY ON ASCENT B/T 5000-8000. THEN PROLONGED ON DESCENT FROM UPPER TEENS (1 (N663JB)
- [SDR DXTA2026021106822](https://openairdocs.org/sdr/DXTA2026021106822), Feb 8, 2026: Bombdr BD7001A12. SENSOR. DEFECTIVE. ABOUT 5 MINUTES INTO FLIGHT, NOTICED A SLIGHT SMOKY ODOR & A MIN LATER, FA SAID SHE SMELLED SMOKE. SIC ALSO SMELLED SMOK (N190QS)
- [SDR DALA2026011800403](https://openairdocs.org/sdr/DALA2026011800403), Jan 16, 2026: Airbus A320212. ACTUATOR. FAILED. DUE TO AIR PACK 1 2 FAULT ECAM WARNING AT FL320 (PACK 1 FAILED WITH PACK 2 ON MEL). REPLACED LEFT RAM AIR OUTLET ACTUATO (N338NW)
- [SDR KY7A2026011600038](https://openairdocs.org/sdr/KY7A2026011600038), Nov 24, 2025: Swrngn SA227AC. COOLING TURBINE. FUMES. AIRCRAFT SMOKY WHEN IN FULL HOT. DRAINED 0IL OUT OF COOLING TURBINE REF SA227 MM CH 21-50-00 (N787C)
- [SDR CALA2025110610943](https://openairdocs.org/sdr/CALA2025110610943), Nov 3, 2025: Boeing 7379. UNKNOWN. ODOR. JET FUEL ODOR IN AFT GALLEY AREA DURING TAKEOFF AND LANDING. PERFORMED APU DRAIN MAST INSPECTION IN REF AMM 49-16-11. NO (N37521)
- [SDR IPXA2025101465028](https://openairdocs.org/sdr/IPXA2025101465028), Oct 14, 2025: Doug MD11F. CONTROLLER. FAULTED. ATB, LEVEL 2 AVIONICS AIR FLOW OFF AFTER TAKE OFF, RESULTED IN AIR TURNBACK REMOVED AND REPLACED ENVIRONMENTAL SYSTEM CO (N255UP)
- [SDR HNAA2025100100653](https://openairdocs.org/sdr/HNAA2025100100653), Oct 1, 2025: Emb EMB145LR. MIXER BOX. ODOR. AFTER T/O, CREW REPORTS STRONG BURNING SMELL, MORE RUBBBER THAN ELECTRICAL. RAR CONDENSER/ MIXER OPS CHECK GOOD. (N658AE)
- [SDR YENA2025091700944](https://openairdocs.org/sdr/YENA2025091700944), Sep 15, 2025: Airbus A320232. ECS. CONTAMINATED. FLT#172, FLL-LGA. CABIN CREW REPORTED FUMES DURING DESCENT IN ROWS 10-15. SMELL OF CHEMICALS OR DIRTY SOCKS; COMPLIED WI (N641JB)
- [SDR HALA20250912277](https://openairdocs.org/sdr/HALA20250912277), Sep 11, 2025: Airbus A330343. VENT. FAULTED. DIV - COND MD VENT FAULT. DIV TO KSTL. AWAITING INFO AND RESOLUTION (N5879K)
- [SDR HALA20250910276](https://openairdocs.org/sdr/HALA20250910276), Sep 9, 2025: Airbus A330243. SEAL. BROKEN. ETOPS - F/A REPORTED FLOOR VIBRATION AND HUM ROW 15 THRU 19 A/C RIGHT ON CLIMB OUT, NOISE CHANGE WITH A/C SPEED . T/SHOO (N395HA)
- [SDR YENA2025090500914](https://openairdocs.org/sdr/YENA2025090500914), Sep 4, 2025: Airbus A321271NX. COMPUTER. FAILED. FLT#7, JFK-LHR. (ETOPS) "VENT AVNCS SYS FAULT AT THE GATE; PER MCC REQUEST REMOVED AND REPLACED AEVC COMPUTER IAW AMM 21 (N4077J)
- [SDR CALA2025090308431](https://openairdocs.org/sdr/CALA2025090308431), Aug 29, 2025: Boeing 777222. ECS. CONTAMINATED. DUE TO ENGINE 2 REMOVAL FOR OIL WETTING FOUND IN THE COMPRESSOR, REPLACE THE OZONE CONVERTER, DUAL HEAT EXCHANGER, CONDE (N229UA)
- [SDR CNMA2025080001](https://openairdocs.org/sdr/CNMA2025080001), Aug 27, 2025: Boeing 76736N. FAN. FAULT MESSAGE. ON CLIMB AT 5000 FEET R RECIRC FAN EICAS. AT 6500 FEET LOUD BAND AND YAW AND R RECIRC FAN EICAS EXTINGUISHED. WE HAD A B (N468AX)
- [SDR M3XA20250720004](https://openairdocs.org/sdr/M3XA20250720004), Jul 20, 2025: Bell 407. RELAY. OVERHEATED. PILOT PERFORMED A PRECAUTIONARY LANDING FOR A BURNING SMELL IN THE CABIN. DURING INSPECTION OF THE ACFT THE MECHANIC FOU (N521RC)
- [SDR AALA202507211272](https://openairdocs.org/sdr/AALA202507211272), Jul 19, 2025: Boeing 777223. VALVE. FAULTED. AIRCRAFT WAS GROUNDED: 96F IN COCKPIT - NO CHANGE AFTER 40 MINUTES FLIGHT TIME REQUIRING RETURN TO DFW, EMERGENCY DECLAR (N759AN)
- [SDR HALA20250623192](https://openairdocs.org/sdr/HALA20250623192), Jun 22, 2025: Airbus A330243. FILTER. NOT REPORTED. ETOPS - INTERMITTENT STATUS MESSAGE: FWD CARGO VENT, BULK VENT NUMEROUS TIMES; LASTING A FEW SECS. REMOVED AND REPLACED  (N383HA)
- [SDR YENA2025061600612](https://openairdocs.org/sdr/YENA2025061600612), Jun 13, 2025: Airbus BD5001A11. PRECOOLER. FAULTED. FLT#21, BOS-PBI. (AIRCRAFT PERFORMED AN AIR TURN BACK TO BOS). '" R BLEED OVHT" CAUTION MESSAGE O N CLIMBOUT. SEVERAL MI (N3142J)
- [SDR 3EJA202506090001](https://openairdocs.org/sdr/3EJA202506090001), Jun 9, 2025: Cessna 560XL. UNKNOWN. NOISE. WHILE CLIMBING THROUGH FL280 WE EXPERIENCED AND LOUD POP/THUMP AND THEN HEARD AIR RUSHING INTO THE AIRCRAFT. (N821JS)
- [SDR YENA2025042300423](https://openairdocs.org/sdr/YENA2025042300423), Apr 22, 2025: Airbus A320232. ECS. CONTAMINATED. FLT#637, BDL-MCO. 'CABIN AIR QUALITY EVENT ON APPROACH INTO ORLANDO FLIGHT ATTENDANTS IN THE AFT CABIN COULD SMELL FUEL/ (N657JB)
- [SDR CALA2025040903652](https://openairdocs.org/sdr/CALA2025040903652), Apr 6, 2025: Boeing 737824. MODULE. FAULTED. NGS DEGRADED BLUE LIGHT COMPLIED WITH DEFERAL AND APPLIED INOP STICKER. TOMC APPROVED DEFERED. *DM* REF FIM 47-31 TASK 8 (N14231)
- [SDR DALA2025040202491](https://openairdocs.org/sdr/DALA2025040202491), Apr 1, 2025: Boeing 757251. HEAT EXCHANGER. LEAKING. SHIP 5644 -ATB/PRES/DE- DUE TO CABIN PRESSURE CONTROL ISSUE. CORRECTIVE ACTION: R/R OUTFLOW VALVE, CABIN PRESS CONTROL P (N544US)
- [SDR YENA2025033100345](https://openairdocs.org/sdr/YENA2025033100345), Mar 29, 2025: Airbus A321271NX. VALVE. FAILED. FLT#2724, LAX-JFK. (ETOPS) 'COND TRIM AIR SYS FAULT - FWD CABIN TRIM VALVE; SYSTEM TROUBLESHOOT IAW TSM 21-63-00-810-803 (N4080J)
- [SDR NACA20250414009](https://openairdocs.org/sdr/NACA20250414009), Mar 11, 2025: Boeing 767323. CONTROLLER. NO TEST. PERFORM PACK STANDBY CONTROLLER BITE FOUND L NO GO LAMP ON WHEN TURN THE TEST SWITCH TO POSITION 7. (N321CM)
- [SDR SWI2025F00310](https://openairdocs.org/sdr/SWI2025F00310), Mar 6, 2025: Emb ERJ170200LR. MODULE. FAULTED. AMS CTRL FAIL CAUTION MESSAGE APPEARED AT APPROXIMATELY FL230-240 DURING DESCENT ON ARRIVAL. (FLIGHT 6256 - FILED CLOSED (N501SY)
- [SDR DALA2025030701781](https://openairdocs.org/sdr/DALA2025030701781), Mar 5, 2025: Airbus A321213. UNKNOWN. ODOR. SHIP 3036 URNT PLASTIC SMELL COMING FROM OVER WITH ORANGE "SERVICE". CORRECTIVE ACTION: C/W NO-GO ODI PREVENTION PER A32 (N336DX)
- [SDR YENA2025030500231](https://openairdocs.org/sdr/YENA2025030500231), Mar 4, 2025: Airbus A320232. ECS. CONTAMINATED. FLT#667, HPN-PBI.' ODOR REPORTED BY INFLIGHT NOTED AT 3;13 LOCAL THROUGHOUT CABIN MEDIUM INTENSITY DURATION 15 MINUTES C (N665JB)
- [SDR GTIA2025030338776](https://openairdocs.org/sdr/GTIA2025030338776), Feb 28, 2025: Airbus A320271N. ECS. CONTAMINATED. DIRTY SOCKS SMELL IN COCKPIT SHORT FINAL.-ACCOMPLISHED DECONTAMINATION OF ENVIROMENTAL SYS IAW AMM21-00-00-615-803-AQ R+ (N917NK)
- [SDR GTIA2025030338772](https://openairdocs.org/sdr/GTIA2025030338772), Feb 28, 2025: Airbus A320271N. ECS. CONTAMINATED. DESCENDING THROUGH 14,000 FT FLIGHT ATTENDANTS IN THE AFT OF THE AIRPLANE CALLED TO ADVISE OF STRONG MOULD SMELL IT CONT (N970NK)
- [SDR YENA2025030300222](https://openairdocs.org/sdr/YENA2025030300222), Feb 26, 2025: Airbus A320232. ECS. CONTAMINATED. FLT#2126, MLB-FLL. 'FUMES ODOR NOTED ON DESCENT FOR SEVERAL MINUTES. DECREASED AT HIGHER THRUST SETTING. FLT ATT'S REPOR (N809JB)
- [SDR CALA2025022402416](https://openairdocs.org/sdr/CALA2025022402416), Feb 23, 2025: Boeing 7379. INLET. CONTAMINATED. SMOKE OR FUMES IN CABIN AIR SUPPLIED BY APU ACCOMPLISHED FIM 49-52 TASK 801, THE LEFT PACK WAS RUNNING WHEN RAMP DE-ICED (N37532)
- [SDR CALA2025021002248](https://openairdocs.org/sdr/CALA2025021002248), Feb 8, 2025: Airbus A320232. BELLOWS. RUPTURED. REF LP# 3803036 PRESSURATION AT 19000 WAS 8900 FEET CABIN PRES S. LEVELED OFF AT 20000 CABIN PRESS UP TO 9800 ORIGINAL L (N493UA)
- [SDR DALA2025020400829](https://openairdocs.org/sdr/DALA2025020400829), Jan 30, 2025: Airbus A319114. VALVE. FAULTED. SHIP 3102 - DIV - TO BIL DUE LOSS OF LT ENGINE BLEED PRESSURE WITH RT PACK ALREADY ON MEL. CORRECTIVE ACTION: REPLACED T (N302NB)
- [SDR 141A202501220002](https://openairdocs.org/sdr/141A202501220002), Jan 22, 2025: Pilats PC1247E. WARNING MESSAGE. ILLUMINATED. DURING FLIGHT AT 20000 FEET, ACS LOW INFLOW CAS MESSAGE, RAN QRH CHECKLIST ACS INHIBITED ABD SET BACK TO AUTO WITH NO CH (N853SA)
- [SDR ABXA20250120017](https://openairdocs.org/sdr/ABXA20250120017), Jan 20, 2025: Boeing 7673P6. VALVE. WARNING MESSAGE. FWD EQPT VAL YELLOW MESSAGE APPEARED WHILE ENTERING RUNWAY FOR TAKEOFF. QRH PROCEDURES DID NOT REMEDY.AC RETURNED TO THE (N762CK)
- [SDR DXTA2025012001973](https://openairdocs.org/sdr/DXTA2025012001973), Jan 15, 2025: Emb EMB505. FAIRING. DAMAGED. AIRFLOW: BIRD FLEW INTO RAM AIR INLET. REPLACED DORSAL FAIRING. IAW EMB-505 SRM PART 2 51-21-03 AIRCRAFT. (N394QS)

All 1,354: https://openairdocs.org/jasc/2100/reports.md

## Other codes in chapter 21

- [JASC 2110](https://openairdocs.org/jasc/2110): Cabin Compressor System (252 reports)
- [JASC 2120](https://openairdocs.org/jasc/2120): Air Distribution System (15,363 reports)
- [JASC 2121](https://openairdocs.org/jasc/2121): Air Distribution Fan (4,377 reports)
- [JASC 2130](https://openairdocs.org/jasc/2130): Cabin Pressure Control System (3,454 reports)
- [JASC 2131](https://openairdocs.org/jasc/2131): Cabin Pressure Controller (2,041 reports)
- [JASC 2132](https://openairdocs.org/jasc/2132): Cabin Pressure Indicator (95 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 (12,384 reports)
- [JASC 2160](https://openairdocs.org/jasc/2160): Cabin Temperature Control System (3,040 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)
- [JASC 2197](https://openairdocs.org/jasc/2197): Air Conditioning System Wiring (497 reports)

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