# JASC 2120: Air Distribution System

- Type: JASC system/component code (FAA)
- ATA chapter: 21 Air Conditioning
- Title in the code table: AIR DISTRIBUTION SYSTEM
- Service difficulty reports: 15,352
- FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=16
- Page: https://openairdocs.org/jasc/2120

## What it covers

The system used to induct and distribute air. Does not include valves that are a part of the temperature control, pressurization, or the distribution fan. Typical parts are equipment rack cooling systems, ozone converters, scoops, ducting, inlets, check valves, wiring, etc.

## Service difficulty reports (15,352, newest 50)

- [SDR DXTA2026101910256](https://openairdocs.org/sdr/DXTA2026101910256), Oct 18, 2026: Cessna 680A. UNKNOWN. ODOR. CLIMBING THROUGH FL300 WE HEARD AN OSCILLATING/BUZZING SOUND COMING FROM BEHIND THE GLARESHIELD LEFT SIDE. SHORTLY BEFOR (N901QS)
- [SDR DXTA2026101910262](https://openairdocs.org/sdr/DXTA2026101910262), Oct 18, 2026: Cessna 680A. UNKNOWN. ODOR. CLIMBING THROUGH 33,000 FT, A SUDDEN BLAST OF VERY HOT AIR AND FUME/OIL SMELL CAME THROUGH THE VENTS IN COCKPIT FOR A SE (N925QS)
- [SDR AALA202610191150](https://openairdocs.org/sdr/AALA202610191150), Oct 16, 2026: Airbus A321211. APU. ODOR. AIRCRAFT WAS GROUNDED: FLIGHT ATTENDANTS REPORT STRONG MUSTY DIRTY SOCK ODOR BETWEEN ROWS 10 AND 22 - MAINTENANCE ISOLAT (N186US)
- [SDR CALA2026101920439](https://openairdocs.org/sdr/CALA2026101920439), Oct 16, 2026: Boeing 767424ER. UNKNOWN. ODOR. 20MIN AFTER TAKE OFF, A FOUL ODOR FROM CAPT GSPR VENT AFTR INCREASES MID & AFT CABIN TEMPS. SMELL STARTED AFTER RAISING  (N67058)
- [SDR YENA2026101600983](https://openairdocs.org/sdr/YENA2026101600983), Oct 15, 2026: Airbus A321271NX. VALVE. FAULTED. FLT 1620, BOS-LHR. (ETOPS) "FWD TRIM AIR VALVE X OUT W/ CLASS II AIR BLEED MSG ( ECAM INDICATION ON COND PAGE ). (N4076J)
- [SDR CALA2026101620409](https://openairdocs.org/sdr/CALA2026101620409), Oct 14, 2026: Boeing 737924ER. UNKNOWN. ODOR. GATE RETURN FOR UNUSUAL ODOR. ODOR SLIGHTLY PRESENT WITH APU AND MUCH MORE PRONOUNCED WITH ENGINE 2. PERFORMED SMOKE/ODO (N68834)
- [SDR SIMA20261014004](https://openairdocs.org/sdr/SIMA20261014004), Oct 14, 2026: Emb ERJ170200LR. UNKNOWN. ODOR. HAD STRONG ODOR ON TAKE OFF ROLL AT FULL THROTTLE, PERMEATED THROUGH THE ENTIRE CABIN. AS WE CLIMBED THE SMELL DISSIPATE (N221NN)
- [SDR CALA2026101520365](https://openairdocs.org/sdr/CALA2026101520365), Oct 14, 2026: Airbus A321271NX. UNKNOWN. ODOR. FOUR MINUTES AFTER ENG SHUT DOWN, DURING DEPLANING PAX & FLT ATTNDNTS NOTED BURNING ODOR UNABLE TO VERIFY FAULT, CYCLED  (N54561)
- [SDR YENA2026101400949](https://openairdocs.org/sdr/YENA2026101400949), Oct 12, 2026: Airbus A321231. UNKNOWN. ODOR. FLT#189, JFK-SAN. BURNING WIRE ODOR FROM ROW 18 TO REAR OF PLANE AFTER 10,000 FT ( LIVE TV4 (SYSTEM/ ALL) ). ISOLATED FA (N976JT)
- [SDR SWAA2026101574936](https://openairdocs.org/sdr/SWAA2026101574936), Oct 11, 2026: Boeing 737752. MANIFOLD. LEAKING. CARGO FIRE EXTINGUISHING, DISCHARGE LIGHT ON, DISCHARGE SWITCH NOT PUSHED. FOUND AIR CONDITIONING DUCT LEAK BLOWING COLD (N7888A)
- [SDR CALA2026101520364](https://openairdocs.org/sdr/CALA2026101520364), Oct 11, 2026: Boeing 767322. UNKNOWN. ODOR. DUE TO REPORTED STRONG BURNING ODOR IN AIRCRAFT. COMPLY WITH CONDITIONAL INSPECTION AMM TASK 05-51-56-940-801-C1. CREW W (N641UA)
- [SDR YENA2026101400950](https://openairdocs.org/sdr/YENA2026101400950), Oct 11, 2026: Airbus BD5001A11. UNKNOWN. ODOR. FLT#1307, BOS-BNA. ALL 3 FLIGHT ATTENDANTS REPORTED AN ODOR UPON LANDING SMELLED LIKE CHEMICAL OR BURNING CANDLE; TROUBL (N3195J)
- [SDR SWAA2026101218971](https://openairdocs.org/sdr/SWAA2026101218971), Oct 11, 2026: Boeing 7378H4. FILTER. ODOR. SEVERAL PAX SMELLED A SCORCHED ODOR AROUND ROW 27 ON THE RT SIDE OF THE ACFT. RAN PACKS WITH ENG BLEEDS RAN PACKS WITH A (N8699A)
- [SDR CALA2026101320353](https://openairdocs.org/sdr/CALA2026101320353), Oct 10, 2026: Boeing 767322. UNKNOWN. ODOR. STRONG BURNING ODOR THROUGHOUT ACFT FOLLOWING START OF LT ENG. NO SMOKE PRESENT. APU BLEED ON. ISOLATION VALVES OPEN. PA (N641UA)
- [SDR YENA2026101200941](https://openairdocs.org/sdr/YENA2026101200941), Oct 10, 2026: Airbus A321271NX. UNKNOWN. ODOR. FLT#623, JFK-LAX. INFLIGHT REPORTED "BURNING" ODOR IN FWD CABIN AND LATER REPROTED SAME ODOR IN AFT GALLEY IN "MIST" EVE (N2193J)
- [SDR CALA2026101220262](https://openairdocs.org/sdr/CALA2026101220262), Oct 10, 2026: Boeing 737824. UNKNOWN. ODOR. HOT DIRTY SOCK ODOR ON T/O PWR SET. GOT STRONGER ON INITIAL C LIMB. DISSAPATED AFTER DEBRIEFED CREW AND THEY STATED THAT (N17245)
- [SDR DXTA2026101210099](https://openairdocs.org/sdr/DXTA2026101210099), Oct 9, 2026: Cessna 680A. UNKNOWN. ODOR. DURING CLIMB OUT AFTER TAKEOFF DETECTED A VERY PUNGENT ODOR COMING FROM THE COCKPIT VENTS. NO FAULTS FOUND. OPS CHECK GO (N646QS)
- [SDR YENA2026100900935](https://openairdocs.org/sdr/YENA2026100900935), Oct 9, 2026: Airbus A320232. UNKNOWN. ODOR. FLT#2695, HPN-MCO. ONE INFLIGHT REPORTED STRONG DIRTY SOCKS SMELL IN AFT GALLEY THRU ROW 22. WHEN CABIN TEMP CONTROLLERS (N648JB)
- [SDR CALA2026101220258](https://openairdocs.org/sdr/CALA2026101220258), Oct 8, 2026: Boeing 7378. UNKNOWN. ODOR. WHEN WE GOT ON THE PLANE THERE WAS A STRANGE ODOR OF BURNING PLASTIC WITH NO SMOKE. RUNNING THE LEFT AND RIGHT ENGINE. F (N17356)
- [SDR YENA2026100900936](https://openairdocs.org/sdr/YENA2026100900936), Oct 8, 2026: Airbus A321271NX. FILTER. DIRTY. FLT#8443, BOS-JFK. REF LP 4683513-2 OZONE FILTER NEED REPLACE DUE TO ODOR EVENT; R + R OZONE FILTER PER AMM 21-51-41 (N4062J)
- [SDR QMLA2026100820077](https://openairdocs.org/sdr/QMLA2026100820077), Oct 8, 2026: Urocop EC130B4. UNKNOWN. ODOR. POTENT FUEL ODOR, AFTER TAKEOFF IN COCKPIT WITH PATIENT ON BOARD. (N151AC)
- [SDR CALA2026100920237](https://openairdocs.org/sdr/CALA2026100920237), Oct 7, 2026: Boeing 7379. AIR FILTER. ODOR. FAS AND PAX REPORT STRONG CHEMICAL/FUEL ODOR IN CABIN. FAS REPORT SAME ODOR AS PREVIOUS WRITE UP. R & R RECIRCULATION AI (N17413)
- [SDR SWIA2026100777528](https://openairdocs.org/sdr/SWIA2026100777528), Oct 7, 2026: Cndair CL6002C11. UNKNOWN. ODOR. TROUBLESHOOT FOR FA & PAX IN LAST ROW, BOTH REPORTED SMELLING A STRONG OIL OR FUEL TYPE ODOR IN FLT, & THE PERIOD IMMEDI (N787SK)
- [SDR YENA2026100700929](https://openairdocs.org/sdr/YENA2026100700929), Oct 7, 2026: Airbus A321271NX. VALVE. FAULTED. FLT # 1408, (ETOPS) "FWD CABIN TRIM VLV FAULT ( COCKPIT/CABIN TRIM AIR VALVES ). OPEN (N4076J)
- [SDR YENA2026100700931](https://openairdocs.org/sdr/YENA2026100700931), Oct 6, 2026: Airbus BD5001A11. UNKNOWN. ODOR. FLT 151, BOS-SRQ. AT FL 300 IN VMC COND THE FA REPORTED DIRTY SOCKS ODOR IN GALLEY THAT LASTED 15 MINS. UPON LANDING AFT (N3215J)
- [SDR SWIA2026100677526](https://openairdocs.org/sdr/SWIA2026100677526), Oct 6, 2026: Cndair CL6002C11. UNKNOWN. FUMES. ON CLIMB OUT FROM KLNK, AROUND FL260, BEGAN TO SMELL AN ABNORMAL FUME IN THE FLIGHT DECK. OODR WAS REMINISCENT OF FUMES  (N603SK)
- [SDR CALA2026100820233](https://openairdocs.org/sdr/CALA2026100820233), Oct 5, 2026: Boeing 737824. UNKNOWN. ODOR. SMOKE AND FUMES IN THE FLIGHT DECK ON TAKEOFF RTO AT 50 KTS. CREW INDICATED A HAZE WITH THE ODOR LIKE BURNED OIL. ACCOMP (N78540)
- [SDR CALA2026100720208](https://openairdocs.org/sdr/CALA2026100720208), Oct 5, 2026: Boeing 737824. UNKNOWN. ODOR. REPORT FAINT MUSTY SMELL WHEN CLIMBING FROM 6000 FEET THROUGH 13000 FEET. SMELL WENT AWAY AND CAME BACK DESCENDING THROU (N78540)
- [SDR CALA2026101320352](https://openairdocs.org/sdr/CALA2026101320352), Oct 4, 2026: Boeing 757224. UNKNOWN. ODOR. ACFT WILL RETURN TO FIELD DUE TO HEAVY ODOR OF FUEL IN CABIN. DE-BRIEFED CREW UPON LANDING. HAD FUEL ODOR INITIALLY ON G (N14118)
- [SDR YENA2026100900937](https://openairdocs.org/sdr/YENA2026100900937), Oct 4, 2026: Airbus A321271NX. UNKNOWN. ODOR. FLT#1537, JFK-STI. ODOR SIMILAR TO MAGIC MARKER ON CLIMB THROUGH FL180 AND AGAIN ON DESCENT THRU 10000'. APU WAS NOT RUN (N2016J)
- [SDR SWAA2026100813969](https://openairdocs.org/sdr/SWAA2026100813969), Oct 4, 2026: Boeing 7378. FILTER. ODOR. ACRID ODOR DURING DESCENT. DISSIPATED WITH RECIRC FANS TURNED OFF. REAPPEARED WITH FANS BACK ON AT GATE. R & R LT RECIRC (N8790Q)
- [SDR YENA2026100700930](https://openairdocs.org/sdr/YENA2026100700930), Oct 4, 2026: Airbus A320232. UNKNOWN. ODOR. FLT 2549, FLL-SDQ. FWD GALLEY BY PANEL 113 INTERMITTENT ODOR OF FUEL 1.2 HOURS INTO FLIGHT. C/W INFO NOTICE 2017-T015 ST (N705JB)
- [SDR CALA2026100720206](https://openairdocs.org/sdr/CALA2026100720206), Oct 3, 2026: Boeing 757324. UNKNOWN. ODOR. OIL - FUEL FUMES IN CABIN AFTER START. DID NOT GO AWAY UNTIL SHUT DOWN. STRONG ENOUGH TO FEEL PHYSILOGICAL EFFECTS. CAPT (N56859)
- [SDR CALA2026100620166](https://openairdocs.org/sdr/CALA2026100620166), Oct 3, 2026: Boeing 737924ER. UNKNOWN. ODOR. HAD AN ABNORMAL ODOR COMING FROM THE AIR CONDITIONING AT LOW POWER SETTINGS. PERFORMED SMOKE/ODOR IN THE FLIGHT DECK/CAB (N69824)
- [SDR CALA2026100620134](https://openairdocs.org/sdr/CALA2026100620134), Oct 3, 2026: Boeing 777222. UNKNOWN. ODOR. SMOKE ODOR CONDITIONAL INSP REQUIRED PER AMM 05-51-XX DUE TO AN INCIDENT REPORTED BY THE CREW.SLIGHT ELEC ODOR NOTICED B (N769UA)
- [SDR FDEA202610031473](https://openairdocs.org/sdr/FDEA202610031473), Oct 3, 2026: Boeing 767300. UNKNOWN. ODOR. OIL SMELL IN COCKPIT FROM TAKEOFF AT VTBS. DID NOT NOTICE ANY SMELL AT ALTITUDE IN CRUISE. DESCENDING INTO WMKP AT ABOUT (N132FE)
- [SDR SIMA20261003001](https://openairdocs.org/sdr/SIMA20261003001), Oct 3, 2026: Emb ERJ170200LR. UNKNOWN. ODOR. ON THE DESCENT THRU 14,000FT HAS SOME TURBULENCE AND FA1 CALLS SHORTLY AFTER REPORTING A BURNING SMELL COMING FROM FIRST (N228NN)
- [SDR YENA2026100500925](https://openairdocs.org/sdr/YENA2026100500925), Oct 2, 2026: Airbus A321271NX. UNKNOWN. ODOR. FLT 2088, LAX-BOS. (ETOPS) "COCKPIT ONLY. NO CABIN ODOR EVENT IN DESCENT. PASSING 8000', THIN LAYER +18C, IDLE POWER. DI (N4062J)
- [SDR CALA2026100520107](https://openairdocs.org/sdr/CALA2026100520107), Oct 2, 2026: Boeing 737824. FILTER. ODOR. AFT FAS REPORT BURNT TOAST AND BURNT RUBBER ODOR IN AFT GALLEY. REPLACED RECIRCULATION FILTER IAW MM 21-25-01. RAN BOTH  (N16217)
- [SDR YENA2026100200922](https://openairdocs.org/sdr/YENA2026100200922), Oct 2, 2026: Airbus A320232. UNKNOWN. ODOR. FLT 959, BDL-FLL. ODOR EVENT DURING DESCENT, INFLIGHT DESCRIBES AS URINE/DIRTY SOCK/ AMONIA. NOT NOTICEABLE IN FWD AND A (N633JB)
- [SDR SWAA2026100588044](https://openairdocs.org/sdr/SWAA2026100588044), Oct 1, 2026: Boeing 7377H4. UNKNOWN. SMOKE. SMALL PATCH OF VISIBLE WHITE SMOKE AND FUMES BTWN CA HEAD & IPAD. DID NOT CONTINUE AND NO OTHER INDICATIONS OF SMOKE OR  (N443WN)
- [SDR SWAA2026100568427](https://openairdocs.org/sdr/SWAA2026100568427), Oct 1, 2026: Boeing 7378H4. UNKNOWN. ODOR. OTS - ELECTRICAL ODOR IN FWD GALLEY AREA_ INSPECTED COFFEE MAKER GALLEY LIGHTING AND POWER PANEL NO FAULTS FOUND. CREW R (N8609A)
- [SDR DALA2026100505502](https://openairdocs.org/sdr/DALA2026100505502), Oct 1, 2026: Airbus BD5001A11. UNKNOWN. ODOR. FA'S REPORTED HOT PLASTIC/ACETONE ODOR FOR ABOUT 30 SECONDS AT TOP OF DESCENT ROW 2-3. COMPLETED ISOLATE SMOKE & FUMES A (N330DU)
- [SDR CALA2026100520105](https://openairdocs.org/sdr/CALA2026100520105), Oct 1, 2026: Boeing 777224. UNKNOWN. ODOR. ELEC BURNING ODOR IN CABIN, JUST BEFORE LANDING. PERFORMED INSPECTION AT THE MID GALLEY OVENS, COFFEE MAKERS AND LAV'S.  (N77014)
- [SDR DALA2026100705550](https://openairdocs.org/sdr/DALA2026100705550), Sep 30, 2026: Boeing 757232. UNKNOWN. ODOR. FROM 2000' AFE DURING FINAL CONFIGURATION NOTED A FUEL ODOR. UPON LANDING THE ODOR WAS GONE AND DURING TAXI ZERO ODOR PR (N658DL)
- [SDR SWIA2026093077334](https://openairdocs.org/sdr/SWIA2026093077334), Sep 30, 2026: Emb ERJ170200LR. UNKNOWN. ODOR. ON CLIMB OUT FAS REPORTED A ODOR THAT WAS SWEETSMOKY ODOR WITH NO SMOKE VISIBLE WAS REPORTED AS SIMILAR TO DEUCE FLUID S (N118SY)
- [SDR SWAA2026100179043](https://openairdocs.org/sdr/SWAA2026100179043), Sep 29, 2026: Boeing 7378. UNKNOWN. ODOR. GAS ODOR (METHANE LIKE) AT ROWS 20-25 RAN NR 1 & 2 ENGINES, AND LT & RT PACKS, PERFORMED CONDITIONAL INSPECTIONS IAW AMM (N8729H)
- [SDR DALA2026093005436](https://openairdocs.org/sdr/DALA2026093005436), Sep 29, 2026: Airbus BD5001A11. UNKNOWN. ODOR. DIV - TO BOI DUE TO FUMES IN ROWS 11-20. PERFORMED LEVEL "A " DECONTAMINATION, SMELL NO LONGER PRESENT. (LP# 9456408; AI (N326DU)
- [SDR YENA2026093000917](https://openairdocs.org/sdr/YENA2026093000917), Sep 29, 2026: Airbus A320232. UNKNOWN. ODOR. FLT 2482, BNA-FLL. ON APPROACH & LANDING INFLIGHT CREW REPORTS FUMES IN AFT PART OF AICRAFT. OPEN (N638JB)
- [SDR YENA2026100200924](https://openairdocs.org/sdr/YENA2026100200924), Sep 28, 2026: Airbus A321271NX. UNKNOWN. ODOR. FLT 83, JFK-MCO. BURNING ODOR SMELLED IN COCKPIT DURING DECENT AT 20,000 FT. ODOR ISOLATION CHECKLIST ACCOMPLISHED. ODOR (N2086J)

All 15,352: https://openairdocs.org/jasc/2120/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 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)
- [JASC 2197](https://openairdocs.org/jasc/2197): Air Conditioning System Wiring (497 reports)

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