# JASC 3500: Oxygen System - Type: JASC system/component code (FAA) - ATA chapter: 35 Oxygen - Title in the code table: OXYGEN SYSTEM - Service difficulty reports: 180 - FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=41 - Page: https://openairdocs.org/jasc/3500 ## What it covers The units and components which store, regulate, and deliver breathing oxygen to the passengers and crew. Typical parts are bottles, relief valves, shut-off valves, outlets, regulators, masks, walk-around bottles, etc. ## Service difficulty reports (180, newest 50) - [SDR CALA2026041315286](https://openairdocs.org/sdr/CALA2026041315286), Apr 7, 2026: Boeing 737724. SENSOR. FAULTED. NITROGEN GENERATION SYSTEM OPERABILITY INDICATOR DEGRADED (BLUE) LIGHT IS ON. BLUE LIGHT ON NITROGEN GENERATOR. PERFORME (N16703) - [SDR CALA2025111711228](https://openairdocs.org/sdr/CALA2025111711228), Nov 16, 2025: Boeing 737924ER. CHECK VALVE. FAULTED. LEAK CHECK OF NITROGEN GENERATION SYSTEM, RESIDUAL FUEL & FUEL ODOR AT BOTH DRAIN PORTS, REQUIRES PRIMARY AND SECONDARY (N37456) - [SDR DXTA2025070804140](https://openairdocs.org/sdr/DXTA2025070804140), Jul 5, 2025: Cessna 560XL. PRESSURE SWITCH. FAULTED. COMING THROUGH 16,000 FEET ON OUR ARRIVAL THE EAGLE WE HAD WHAT APPEARED TO BE AN RAPID DECOMPRESSION. WE HAD A LOUD BAN (N672QS) - [SDR MTNA20250401001](https://openairdocs.org/sdr/MTNA20250401001), Apr 1, 2025: Aerosp ATR42300. REGULATOR. LEAKING. OXYGEN SYSTEM TRANSMITTER / REGULATOR SLOWLY LEAKING. (N909FX) - [SDR CALA2024110102753](https://openairdocs.org/sdr/CALA2024110102753), Oct 28, 2024: Boeing 737724. ACTUATOR. FAILED. ALL PAX O2 MASKS DEPLOYED BY ACCIDENT ON INITIAL PREFLIGHT PAX OXYGEN MASKS DID NOT DEPLOY AT: 7ABC, 8ABC, 10ABC, 10DEF, (N16701) - [SDR UIEA2024072600753](https://openairdocs.org/sdr/UIEA2024072600753), Jul 26, 2024: Boeing 767375. AVERAGING UNIT. FAULTED. ON GROUND OXYGEN PRESSURE SHOWS 40 PSI.(

R/R AVERAGING UNIT IAW AMM 35-11-06. OPS & LEAK CHECK GOOD. DMI 213524 CL (N649GT) - [SDR UIEA2024071300660](https://openairdocs.org/sdr/UIEA2024071300660), Jul 15, 2024: Boeing 76738E. OXYGEN BOTTLE. DAMAGED. FWD CLOSET PORTABLE OXYGEN BOTTLE MFG LABEL DAMAGE P/N 9700C1A-BF23A(

REMOVED AND REPLACED PORTABLE OXYGEN CYLINDER LO (N641GT) - [SDR G41A202405100365](https://openairdocs.org/sdr/G41A202405100365), May 9, 2024: Lear 60LEAR. CONNECTOR. BACKED OUT. ON 5/9/2024 N276BG, CYO276, DEPARTED KELP HEADING TO KSGU, APPROXIMATELY 15 MINUTES INTO THE FLIGHT, THE CAPTAIN NOTICED (N276BG) - [SDR DALA2024042304653](https://openairdocs.org/sdr/DALA2024042304653), Apr 22, 2024: Airbus A330323. CONTROL PANEL. UNSECURE. OXYGEN PANEL LOOSE. RESECURED O2 PANEL LOC'N 108 PER A330-300 AMM 35-21-41. OK FOR SVC. (N801NW) - [SDR DALA2024010210750](https://openairdocs.org/sdr/DALA2024010210750), Dec 27, 2023: Airbus A320211. UNKNOWN. UNKNOWN. TWO AFT O2 BOTTLES INSTALLED IMPROPERLY. CAN NOT REMOVE BOTTLES. ADJUSTED AFT TWO O2 BOTTLE BRACKETS AS REQUIRED. O2 BOT (N317US) - [SDR ASAA2023072244211](https://openairdocs.org/sdr/ASAA2023072244211), Jul 22, 2023: Boeing 7379. MODULATING VALVE. FAULTY. TECH SERVICES REQUEST FOR FOLLOW-UP TO MTX LIGHT & FAULT(#1 LEFT FAMV FAULT 36-12020 #1(LH) FAMV IS NOT IN COMMANDED POS (N934AK) - [SDR DALA2023072906139](https://openairdocs.org/sdr/DALA2023072906139), Jul 18, 2023: Boeing 757351. UNKNOWN. UNKNOWN. SHIP 5801 -DIV- TO DFW DUE TO ROW 34 ABC OXYGEN MASKS DROPPED DURING TAKEOFF FROM LAX. CORRECTIVE ACTION: APPLIED MEL AN (N581NW) - [SDR DALA2023071005589](https://openairdocs.org/sdr/DALA2023071005589), Jul 9, 2023: Airbus A320*. UNKNOWN. UNKNOWN. SHIP 5028 - ATB - DUE TO CAPTAIN SIDE O2 PRESSURE DROPPING. INSPECTED AND FOUND BOTH CAPTAIN AND FIRST OBSERVER IN EMERG (N528DE) - [SDR CALA2023071002206](https://openairdocs.org/sdr/CALA2023071002206), Jul 6, 2023: Airbus A320232. DOOR LATCH. INOPERATIVE. FWD LAV O2 PANEL DOOR REPEATEDLY POPPED OPEN IN FLT. MASKS STAYE D STOWED. FWD LAV O2 BOX DOOR LATCH INOP COMPLIED MEL 3 (N471UA) - [SDR QV1Y2023062224283](https://openairdocs.org/sdr/QV1Y2023062224283), Jun 22, 2023: Boeing 7377BC. UNKNOWN. UNKNOWN. THIS REPORT IS SUBMITTED ON BEHALF OF JET AVIATION AG BASEL - FAA APPROVAL NUMBER QV1Y440K. DURING THE CURRENT MAINTENAN (N7777Q) - [SDR UIEA2023061800648](https://openairdocs.org/sdr/UIEA2023061800648), Jun 18, 2023: Boeing 76731A. UNKNOWN. UNKNOWN. PORTABLE OXYGEN BOTTLE USED AT L-4 LOCATION.(

TRANSFERRED TO MDDR 187645 PER MEL 35-31-01 CAT D, DUE DATE 16OCT2023

SERVICED CREW OXYGEN CYLINDER @ LOWER  E&E COMPARTMENT IAW 767-3 (N1489A) - [SDR MTNA20230508001](https://openairdocs.org/sdr/MTNA20230508001), May 8, 2023: Aerosp ATR42*. UNKNOWN. UNKNOWN. FO O2 MASK LEAKS AT BOX. REPLACED OXYGEN HOSE ASSEMBLY. OPS CHECK GOOD WITH NO DEFECTS NOTED. (N906FX) - [SDR DALA2023050803584](https://openairdocs.org/sdr/DALA2023050803584), May 6, 2023: Airbus A330323. UNKNOWN. UNKNOWN. SHIP 3304 LOW O2 WARNING IN CREW RESTCOMPARTMENT.MASKS DEPLOYED. THE SYS WAS RESET. CORRECTIVE ACTION: TSM TASK PERFORME (N804NW) - [SDR UIEA2023040300308](https://openairdocs.org/sdr/UIEA2023040300308), Apr 3, 2023: Boeing 76733A. UNKNOWN. UNKNOWN. FWD E/E CREW OXYGEN NEED SERVICE TO FULL.(

SERVICED FWD E&E CREW OXYGEN AS PER B767 AMM CH 12-15-08, AC 43.18-1B P (N1997A) - [SDR UIEA2023040100300](https://openairdocs.org/sdr/UIEA2023040100300), Apr 1, 2023: Boeing 74747UF. UNKNOWN. UNKNOWN. RIGHT SUPERNUMERARY SEAT OXYGEN MASKS DEPLOYED (UNCOMMANDED) IN FLIGHT(

TRANSFER TO DMI 183092 PER MEL 35-21-01-02-01 (N493MC) - [SDR UIEA2023032300280](https://openairdocs.org/sdr/UIEA2023032300280), Mar 23, 2023: Boeing 767324. CYLINDER. UNKNOWN. FORWARD CLOSET #119 MOUNTED PORTABLE O2 BOTTLE PRESSURE LOW.(

R/R PORTABLE OXYGEN CYLINDER FWD CLOSET IAW AMM 35-31-01 (N645GT) - [SDR UIEA2023021700131](https://openairdocs.org/sdr/UIEA2023021700131), Feb 17, 2023: Boeing 747422. NONE. NONE. CREW OXYGEN DROPPED FROM 1500-400 PSI IN 7 HOURS(

LEAKING B-NUT FITTING FOUND AT REGULATOR (N480MC) - [SDR WX0A2022102874293](https://openairdocs.org/sdr/WX0A2022102874293), Oct 27, 2022: Airbus A300*. EPSU. NONE. ALL EMERGENCY LIGHTS ARE INOP DURING ENG GEN OFF AND APU OFF AND LIGHTS IN ""ARMED"" POSITION / REPLACED EMER LT BATTERI (N282NV) - [SDR P5CA2022092100172](https://openairdocs.org/sdr/P5CA2022092100172), Sep 18, 2022: Boeing 777. OXYGEN BOTTLE. NONE. PORTABLE OXYGEN BOTTLE AT GALLEY EMERGENCY EQUIPMENT COMPARTMENT LOW PRESSURE(

REMOVED AND REPLACED PORTABLE OXY (N705GT) - [SDR HALA2022090100254](https://openairdocs.org/sdr/HALA2022090100254), Aug 31, 2022: Airbus A321271N. NONE. NONE. ETOPS - ECAM: ANTI ICE ENG 1 SYS FAULT, ENG 1 A-ICE MONG FAULT ILLUMINATED IN DESCENT 1-2 MINUTES // REMOVED AND REPLACE (N226HA) - [SDR SWIA202266344](https://openairdocs.org/sdr/SWIA202266344), Aug 21, 2022: Emb EMB110*. NONE. LEAKING. D: PER FLEET COORDINATOR, DUE TO HISTORY OF REPEATED CREW O2 SERVICING AND PRESSURE TOO LOW FOR DISPATCH, PLEASE TROUBLE (N611UX) - [SDR GTIA2022081536584](https://openairdocs.org/sdr/GTIA2022081536584), Aug 12, 2022: Airbus A320232. OXYGEN MASK. LEAKING. "FO OXYGEN MASK HAD A CONTINOUS LEAK WHEN STOWED -R/R OF THE FO,S 02 MASK DUE TO LEAKING IAW AMM 35-12-41 LEAK CK GOOD S (N694NK) - [SDR UIEA2022080200802](https://openairdocs.org/sdr/UIEA2022080200802), Aug 2, 2022: Boeing 7673S1. PANEL. DAMAGED. MD OXYGEN MASK ACCESS PANEL DAMAGE ON ROW 10 D,F & G.(

REPAIRED PANEL PER SRM 51-20-05-06-0. OK FOR SERVICE.

) (N640GT) - [SDR UIEA2022070700736](https://openairdocs.org/sdr/UIEA2022070700736), Jul 7, 2022: Boeing 76736N. NONE. NONE. COCKPIT PORTABLE OXYGEN FULL FACE MASK LENS FRAME DAMAGED P/N 10800C15F(

REMOVED  AND  REPLACED  (N1013A) - [SDR SWIA202266124](https://openairdocs.org/sdr/SWIA202266124), Jun 27, 2022: Emb EMB110*. NONE. SCRATCHED. FORWARD WET AREA CROSS BEAM SCRATCHED ALONG CENTER SURFACE AT FRAME 17. (C-CHECK RO 7/13/2022) / CUTOUT DAMAGED AREA AND (N253SY) - [SDR CALA2022050901176](https://openairdocs.org/sdr/CALA2022050901176), May 7, 2022: Boeing 757200. PRESSURE SWITCH. UNSERVICEABLE. (B757-35-3-0009) PASSENGER OXYGEN SYSTEM, ALTITUDE PRESSURE SWIT CH FAILS OPS CHECK. TRANSCRIBED FROM HAECO GSO NRC 9285 (N12125) - [SDR 2022FA0000244](https://openairdocs.org/sdr/2022FA0000244), May 4, 2022: Beech 95B55. FILTER ADAPTER. FAILED. OIL FILTER ADAPTER IS AN F&M ENTERPRISES ADAPTER INSTALLED UNDER AN STC. IT IS AFFECTED BY A STRATUS MANDATORY SERVICE B (N2772) - [SDR YENA2022042900424](https://openairdocs.org/sdr/YENA2022042900424), Apr 27, 2022: Airbus A320232. NONE. NONE. FLT#2519, LGA-MSY. 'FA/S IN REAR OF AIRPLANE REPORTED STRONG MUSTY ODOR AT AROUND 10000' ON DESCENT ACCOMPANIED BY HEADA (N605JB) - [SDR 2022FA0000231](https://openairdocs.org/sdr/2022FA0000231), Apr 27, 2022: Cessna 208B. BULKHEAD WEB. CRACKED. PRIMARY STRUCTURAL ANGLED BULKHEAD P/N: 2612060-5, LOCATED AT F.S 474.4 WHICH INCLUDES THE LEFT AND RIGHT FORWARD HORIZO (N4591B) - [SDR YENA2022042200389](https://openairdocs.org/sdr/YENA2022042200389), Apr 21, 2022: Airbus A320232. NONE. NONE. FLT#1705, EWR-FLL. 'ON DESCENT FROM 8000" TO 3000" WHILE PASSING THROUGH CLOUDS, NOTICEABLE FUME SMELL OF DIRTY SOCKS. D (N646JB) - [SDR UIEA2022041900316](https://openairdocs.org/sdr/UIEA2022041900316), Apr 20, 2022: Boeing 7673Y0. NONE. NONE. FWD CARGO CREW OXYGEN NEED SERVICE TO FULL .(

REMOVED, SERVICED & REINSTALLED FWD CARGO CREW O2 BOTTLE PER B767-30 (N1181A) - [SDR UIEA2022042000348](https://openairdocs.org/sdr/UIEA2022042000348), Apr 20, 2022: Boeing 767324. TRANSDUCER. NONE. COCKPIT O2 INDICATION SHOWED 1990 PSI DURING PREFLIGHT. ATTEMPTED DRAIN BUT PRESSURE/FLOW RATE DECREADED RAPIDLY. MX FOU (N645GT) - [SDR UIEA2022042000349](https://openairdocs.org/sdr/UIEA2022042000349), Apr 20, 2022: Boeing 767. NONE. NONE. #2 OXYGEN BOTTLE PRESSURE REGULATOR LEAKING(

REMOVED AND REPLACED #2 OXYGEN PRESSURE REGULATOR IAW AMM 35-11-03. (N1487A) - [SDR UIEA2022042000350](https://openairdocs.org/sdr/UIEA2022042000350), Apr 19, 2022: Boeing 767. TRANSDUCER. NONE. SUPERNUMERARY O2 INDICATION IS ERRATIC(

TRANSFERRED TO MMDR 164289 IAW MEL 35-11-03-02A, CAT C.

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LOGPAGE 15041 (N1997A) - [SDR YENA2022042000386](https://openairdocs.org/sdr/YENA2022042000386), Apr 19, 2022: Airbus A320232. NONE. NONE. FLT#2061 LGA-RSW. ' DESCENDING THROUGH APPROXIMATELY 9000 AT FLIGHT IDLE A PRONOUNCED ODOR (FUMES SUSPECTED) WAS OBSERVE (N746JB) - [SDR YENA2022042200392](https://openairdocs.org/sdr/YENA2022042200392), Apr 16, 2022: Airbus A320232. NONE. NONE. FLT#1923, SJU-DCA. 'STARTED APU - INFLIGHT CAME ON AC HAD DIRTY SOCK SMELL; REMOVED AND REPLACED RECIRCULATION FILTERS R (N806JB) - [SDR MTNA20220415002](https://openairdocs.org/sdr/MTNA20220415002), Apr 15, 2022: Aerosp 262A12NORD. OXYGEN BOTTLE. LEAKING. ON POWERUP, FOUND O2 BOTTLE LEAKING. REMOVED AND REPLACED O2 CYLINDER. NO LEAKS NOTED. (N916FX) - [SDR 2022F00181](https://openairdocs.org/sdr/2022F00181), Apr 8, 2022: Airbus A319115. NONE. NONE. SEAT MOUNT EMERGENCY LIGHT AT SEATS 24 ABC AND 25ABC IS INOP RESECURED ELECTRIAL CONNECTOR AT BOTH SEATS 24 ABC AND 25 A - [SDR P5CA2022040700109](https://openairdocs.org/sdr/P5CA2022040700109), Apr 4, 2022: Boeing 767. NONE. NONE. FOUND BROKEN WIRE ON OXYGEN #2 TRANSDUCER (WIRE BROKEN FROM BIN)(

REPIN CONNECTOR D25006 (D) IAW SWPM 20-63-01. (N647GT) - [SDR 2022FA0000201](https://openairdocs.org/sdr/2022FA0000201), Apr 3, 2022: Lear 45LEAR. WINDSHIELD. CRACKED. RIGHT HAND, OR COPILOT SIDE WINDSHIELD OUTER GLASS PANE CRACKED INFLIGHT DURING DESCENT. AN EMERGENCY WAS DECLARED AND A (N626JC) - [SDR R61A2022040800257](https://openairdocs.org/sdr/R61A2022040800257), Mar 24, 2022: Emb ERJ170200LR. NONE. CORRODED. CF III EXTERNAL WASTE ACCESS PNL CORRODED. R&R IAW AMM 53-03-60. (N202JQ) - [SDR 2022F00061](https://openairdocs.org/sdr/2022F00061), Feb 20, 2022: Cessna 560XL. OXYGEN MASK. LEAKING. OXYGEN LINE PN: 173382-75 WAS LEAKING AT A CRACK IN THE FITTING AT THE FORWARD PRESSURE BULKHEAD. AT THE TIME OF INSPECT (N644QS) - [SDR UIEA2022021600137](https://openairdocs.org/sdr/UIEA2022021600137), Feb 16, 2022: Boeing 767306. MASK. NONE. FOUND L/H SUPERNUMERARY PARTIAL FACE OXYGEN MASK LEAKING.(

REMOVED AND REPLACED L/H SUPERNUMERARY PARTIAL FACE OXYGEN (N1229A) - [SDR P5CA2022021600042](https://openairdocs.org/sdr/P5CA2022021600042), Feb 16, 2022: Boeing 7673JHF. MASK. NONE. FOUND ONE OXY BOTTLE DAMAGE AT UNDER DOWNLOCK BOX. OTHER TWO REMAIN OK.(

TRANSFERRED TO MDDR 161355 IAW