# JASC 3510: Crew Oxygen System - Type: JASC system/component code (FAA) - ATA chapter: 35 Oxygen - Title in the code table: CREW OXYGEN SYSTEM - Service difficulty reports: 2,415 - FAA code table: https://www.faa.gov/sites/faa.gov/files/JASC_Code.pdf#page=41 - Page: https://openairdocs.org/jasc/3510 ## What it covers The portion of the main system which furnishes oxygen to the crew. ## Service difficulty reports (2,415, newest 50) - [SDR DALA2026102005754](https://openairdocs.org/sdr/DALA2026102005754), Oct 20, 2026: Airbus A330302. OXYGEN MASK. EXPIRED. DURING COCKPIT OXY MASK INSPECTION FOUND F/O OXY MASK WITH EXP DATE: 2025-09(SEP)-19. CORRECTIVE ACTION: REPLACED MASK A (N827NW) - [SDR DALA2026101905722](https://openairdocs.org/sdr/DALA2026101905722), Oct 18, 2026: Boeing 717200. OXYGEN MASK. FAULTED. F/O O2 MASK-SETTINGS DO NOT ALIGN WITH INSIDE INDICATOR IE AT 100% THE INDICATOR READS EMERGENCY, R/R F/O O2 MASK PER B7 (N955AT) - [SDR 2026FA0000838](https://openairdocs.org/sdr/2026FA0000838), Oct 15, 2026: Airbus A330*. LINE. DISCONNECTED. THIS IS AN OCCURANCE REPORT REGARDING THE FINIDNGS RELATED TO THE OXYGEN SYSTEM OF THE NATIONAL AIRCRAFT N873CA. OXY LIN (N873C) - [SDR AALA202610167734](https://openairdocs.org/sdr/AALA202610167734), Oct 14, 2026: Airbus A321211. OXYGEN BOX. LEAKING. AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO ORD DUE TO THE FLIGHT CREW REPORTING A SLO (N179UW) - [SDR ABXA20261004456](https://openairdocs.org/sdr/ABXA20261004456), Oct 4, 2026: Boeing 767338. OXYGEN MASK. NO TEST. DURING SCHEDULED MTC, CAPT. OXYGEN MASK DOES NOT TEST PROPERLY.MTX REMOVED AND REPLACED CAPT OXYGEN MASK STOWAGE BOX IAW (N317CM) - [SDR DALA2026100505487](https://openairdocs.org/sdr/DALA2026100505487), Oct 4, 2026: Airbus A330302. OXYGEN MASK. EXPIRED. FOUND CAPT OXY MASK WITH EXP DATE: 2026 01 (JAN)-16. REPLACED CAPTAINS O2 MASK PER A330 AMM 35-13. (1847085) AIRCRAFT WA (N825NW) - [SDR 2026FA0000792](https://openairdocs.org/sdr/2026FA0000792), Sep 29, 2026: Boeing 777. OXYGEN BOTTLE. LEAKING. OXY BOTTLE WAS INSTALLED IN THE AFT CARGO (T/C. R0731) ON 9TH JULY 26 AT FULL CHARGE, IT WAS NOTICED ON 23RD SEPT 26 TO (N792MF) - [SDR DALA2026100105456](https://openairdocs.org/sdr/DALA2026100105456), Sep 28, 2026: Airbus A319114. OXYGEN BOX. LEAKING. WORKING CREW O2 LEAK MSG. FO MASK BOX LEAKING. R & R MASK STOWING BOX PER AMM 35-12. NO LEAKS NOTED AT THIS TIME. OK SVC (N345NB) - [SDR DALA2026100405477](https://openairdocs.org/sdr/DALA2026100405477), Sep 27, 2026: Airbus A319114. OXYGEN MASK. LEAKING. SUSPECTED CREW 02 LEAK. CA MASK AND BOX REPLACED. C/A: REFER TO LOG 6797929 FOR CORRECTIVE ACTION, OK TO CLOSE LOG. (LP: (N345NB) - [SDR DALA2026092405330](https://openairdocs.org/sdr/DALA2026092405330), Sep 23, 2026: Boeing 717200. OXYGEN MASK. NO TEST. CAPTAIN`S OXYGEN MASK DOES NOT TEST PROPERLY, R & R OBSERVER SEAT CREW O2 MASK BOX IAW AMM 35-13-09. (9110692) (AIRCRAFT (N988AT) - [SDR DALA2026092205297](https://openairdocs.org/sdr/DALA2026092205297), Sep 21, 2026: Airbus A319114. OXYGEN MASK. BROKEN. FO OXYGEN MASK PUSH TO TEST SWITCH BROKEN. SWAPPED FO O2 MASK AND BOX WITH 3RD OBS SEAT PER MEL 25-11-06A M PROCEDURES C (N348NB) - [SDR 2026FA0000778](https://openairdocs.org/sdr/2026FA0000778), Sep 19, 2026: Cndair CL6002B19. DOOR. OPEN. ROUTE VVI-SRE FLIGHT 280 , QRF TO VVI, DUE TO OXYGEN PANEL DOOR OPEN AFTER TAKEOFF. INSPECTED AND CLOSED OXYGEN SERVICE - [SDR FDEA202609181369](https://openairdocs.org/sdr/FDEA202609181369), Sep 18, 2026: Boeing 767300. OXYGEN BOX. FAILED. DURING PREFLIGHT, DISCOVERED TEST TO PRESS AND RESET BUTTON ON FAR LEFT JUMPSEAT OXYGEN MASK WAS DETACHED. AMM 35-11-51- (N198FE) - [SDR VNAA2026092125002](https://openairdocs.org/sdr/VNAA2026092125002), Sep 18, 2026: Cndair CL6002C10. LINE. LEAKING. OXY LOW PRESS MESSAGE ON TAKE OFF FROM THE BEFORE START CHECK TO TAKE OFF 260LBS OF CREW O2 WAS LOST APPROXIMATELY 10 LB (N712PS) - [SDR DALA2026092105252](https://openairdocs.org/sdr/DALA2026092105252), Sep 18, 2026: Airbus A320212. OXYGEN MASK. NO TEST. CAPTAIN`S O2 MASK FAILED PREFLIGHT TEST. FLOW BLINKER DOES NOT SHOW WHEN PRESS TO TEST. REPACKED MASK REF A320 M/M 35-13 (N375NC) - [SDR DALA2026091305113](https://openairdocs.org/sdr/DALA2026091305113), Sep 12, 2026: Airbus A320212. MICROPHONE. INOPERATIVE. F/O OS MASK MICROPHONE NOT WORKING. C/A: SWAPPED THIRD OBSERVER SEAT OT MASK WITH F/O AND FWD THIRD OBSERVER SAET TO MEL (N351NW) - [SDR DALA2026091405115](https://openairdocs.org/sdr/DALA2026091405115), Sep 11, 2026: Airbus A320212. MICROPHONE. INOPERATIVE. F/O OXYGEN MASK MICROPHONE DOESN'T WORK. RESEATED MIC CONNECTOR. CHK NORMAL. IAW AMM 35-13. (LP: 9494820, AIRCRAFT WAS G (N351NW) - [SDR UIEA2026090900862](https://openairdocs.org/sdr/UIEA2026090900862), Sep 9, 2026: Boeing 767324. OXYGEN MASK. LEAKING. FIRST OFFICER O2 MASK LEAKING. REMOVED & REPLACED THE O2 MASK ASSY IAW AMM 35-11-51. OPS CHKD GOOD. THIS CLEARS DMI 2589 (N663GT) - [SDR DALA2026090905048](https://openairdocs.org/sdr/DALA2026090905048), Sep 9, 2026: Boeing 717200. OXYGEN MASK. INOPERATIVE. FO'S OXYGEN MASK HARNESS DOES NOT INFLATE, R & R HARNESS PER AMM 35-12. (9096980) (AIRCRAFT GROUNDED). (N953AT) - [SDR DALA2026091405114](https://openairdocs.org/sdr/DALA2026091405114), Sep 8, 2026: Airbus A320212. OXYGEN MASK. INOPERATIVE. F/O 02 MASK MIC INOP. R & R F/O 02 MASK IAW AMM 35-12 OPS NORMAL. (LP: 9494800, AIRCRAFT WAS GROUNDED) (N351NW) - [SDR DALA2026082604829](https://openairdocs.org/sdr/DALA2026082604829), Aug 24, 2026: Airbus A319114. OXYGEN MASK. BROKEN. DURING A CHECK FOUND TRIM ON MASK BROKEN. R & R F/O OXYGEN MASK IAW AMM 35-12. CKS GOOD. RFID C/W. (LP: 9463021, AIRCRAF (N323NB) - [SDR FDEA202608211220](https://openairdocs.org/sdr/FDEA202608211220), Aug 21, 2026: Boeing 75728A. OXYGEN MASK. NO TEST. DURING MX PREFLIGHT; CAPTAINS O2 MASK FAILS "PRESS TO TEST." REPLACED CAPT'S FULL FACE O2 MASK IAW B757 AMM CH. REF. LIS (N928FD) - [SDR FDEA202608211213](https://openairdocs.org/sdr/FDEA202608211213), Aug 21, 2026: Boeing 75728A. OXYGEN MASK. NO TEST. DURING MX PREFLIGHT, CAPTAINS O2 MASK FAILED A PRESS TO TEST. PREMATURE REMOVAL/INSTALLATION. REPLACED CAPT'S FULL FACE (N928FD) - [SDR DALA2026082004764](https://openairdocs.org/sdr/DALA2026082004764), Aug 19, 2026: Airbus A320212. OXYGEN MASK. LEAKING. CAPT 02 MASK BOX LEAKING. REPLACED CAPT O2 MASK BOX PER A320 AMM 35-12 ALL CKS OK. (LP: 9155501, AIRCRAFT WAS GROUNDED) (N372NW) - [SDR DALA2026081304645](https://openairdocs.org/sdr/DALA2026081304645), Aug 13, 2026: Boeing 717200. OXYGEN MASK. LEAKING. FO'S O2 MASK LEAKING AIR, R & R FO O2 MASK PER B717 AMM 35-13. (9579428) (AIRCRAFT GROUNDED). (N990AT) - [SDR DALA2026082504822](https://openairdocs.org/sdr/DALA2026082504822), Aug 11, 2026: Airbus A320211. OXYGEN MASK. LEAKING. LEAK ON SECOND OBSERVER CREW OXYGEN MASK AT COCKPIT. REMOVED SECOND OBSERVER CREW OXYGEN MASK P/N: MF10-05-11, S/N: 0670 (N378NW) - [SDR ABXA20260810352](https://openairdocs.org/sdr/ABXA20260810352), Aug 10, 2026: Boeing 76731B. OXYGEN BOTTLE. LOW PRESSURE. DURING CREW PREDEPARTURE CHECK, EICAS PRESSURE INDICATION INOP READING 40 PSI. DEFERRED EICAS O2 PRESSOR INDICATION PER (N1361A) - [SDR DALA2026081104623](https://openairdocs.org/sdr/DALA2026081104623), Aug 8, 2026: Airbus A319114. PTT BUTTON. BROKEN. SHIP 3115 DISC: DURING PREFLIGHT FOUND CAPT O2 MASK EMERG PR SELECTOR PTT BUTTON MISSING. SWAPPED ADDITIONAL OBS SEAT MA (N315NB) - [SDR CALA2026080518294](https://openairdocs.org/sdr/CALA2026080518294), Aug 3, 2026: Boeing 737824. SENSOR. FAULTED. NGS DEGRADED, BLUE LIGHT ILLUMINATED. FOUND FAULT NGS OXYGEN SENS FAIL ON EXISTING FAULT. PERFORMED BITE TEST REF 47-31 (N77261) - [SDR DALA2026080604531](https://openairdocs.org/sdr/DALA2026080604531), Aug 1, 2026: Airbus A319114. OXYGEN MASK. NO TEST. CAPTAIN`S O2 MASK DOES NOT TEST PROPERLY. YELLOW CROSS STAYS DISPLAYED AND DOES NOT GO AWAY. R & R CAPT O2 MASK STORAGE (N323NB) - [SDR A6WA202607278902](https://openairdocs.org/sdr/A6WA202607278902), Jul 27, 2026: Cndair CL6002B19. OXYGEN PANEL. UNSECURE. AIRCRAFT TOOK OFF FROM MKE AND SENT AN ACARS SAYING THEY HAVE A POSSIBLE PANEL OPEN AND THAT THEY ARE RETURNING TO MKE. (N466AW) - [SDR 6HUY2026073000025](https://openairdocs.org/sdr/6HUY2026073000025), Jul 22, 2026: OXYGEN MASK. MISREPAIRED. DURING SCHEDULED OVERHAUL OF A CREW OXYGEN MASK REGULATOR UNDER WORK ORDER WHU2605833 F IDENTIFIED THAT THE REGULATOR BL - [SDR DALA2026072304296](https://openairdocs.org/sdr/DALA2026072304296), Jul 20, 2026: Airbus A319114. OXYGEN MASK. UNWANTED DEPLOY. AFT F/A JUMPSEAT OXYGEN MASKS PANEL DROPPED UPON LANDING. REINSTALLED O2 MASK PER AMM 35-10. (LP: 8804206, AIRCRAFT WAS (N339NB) - [SDR CALA2026072117908](https://openairdocs.org/sdr/CALA2026072117908), Jul 20, 2026: Airbus A320232. OXYGEN MASK. LEAKING. OXYGEN MASK LEAKING. VERIFIED CAPTAINS OXYGEN MASK IS LEAKING AT A RAPID RATE & UNABLE TO STOP FLOW. SWAPPED CAPTAINS & (N444UA) - [SDR DALA2026073004417](https://openairdocs.org/sdr/DALA2026073004417), Jul 18, 2026: Airbus A319114. OXYGEN BOX. INOPERATIVE. OBSERVER SEAT INOP DUE TO O2 BOX WONT TEST. DEFERRED TO MEL 25-11-06C PLACARD INSTALLED NO (M) PROCEDURES. PERFORMED OPS (N333NB) - [SDR ABXA20260715321](https://openairdocs.org/sdr/ABXA20260715321), Jul 15, 2026: Boeing 767300. INDICATOR. INACCURATE. DURING MTC PRE-FLIGHT, CREW O2 SYSTEM PRESSURE EICAS INDICATION INACCURATE. PREVIOUSLY REPLACED VOLTAGE AVERAGING UNIT D (N496MM) - [SDR ABXA20260713317](https://openairdocs.org/sdr/ABXA20260713317), Jul 13, 2026: Boeing 767300. INDICATOR. INACCURATE. DURING MTC PRE-FLIGHT, CREW O2 SYSTEM PRESSURE EICAS INDICATION INACCURATE. DEFERRED IAW MEL 35-11-2-1. A/C RETURNED TO (N496MM) - [SDR ABXA20260711313](https://openairdocs.org/sdr/ABXA20260711313), Jul 11, 2026: Boeing 76736N. AUDIO PANEL. MALFUNCTIONED. DURING SERVICE CHECK FOUND CAPTAINS OXYGEN MASK MICROPHONE INOP. SWAPPED CAPTANS AUDIO PANEL WITH FIRST OBSERVERS, IAW A (N1013A) - [SDR 2026FA0000567](https://openairdocs.org/sdr/2026FA0000567), Jul 6, 2026: Cessna 525A. OXYGEN MASK. FAULTED. THE CREW REPORTS THE OXYGEN MASC CONTINUOUSLY FLOW OF OXYGEN AT 100 % FLOW, ATTEMPTEN TO STOP FLOW WITHOUT SUCCESS MASC (N325GH) - [SDR IPXA2026070613325](https://openairdocs.org/sdr/IPXA2026070613325), Jul 5, 2026: Boeing 76734AF. OXYGEN MASK. NO TEST. OBSERVERS OXYGEN MASK DOES NOT FLOW WHEN EMERGENCY BUTTON IS PUSHED. REMOVED AND REPLACED OBSERVER`S OXYGEN MASK IAW AMM (N355UP) - [SDR ABXA20260629295](https://openairdocs.org/sdr/ABXA20260629295), Jun 29, 2026: Boeing 767300. BOTTLE. LEAKING. DURING INSP/MAINT, NR 1 CREW O2 BOTTLE WILL NOT CLOSE FULLY, CONTINUES TO LEAK AFTER BEING SHUT. REMOVED AND REPLACED TH (N493MM) - [SDR AALA202606298713](https://openairdocs.org/sdr/AALA202606298713), Jun 28, 2026: Boeing 7378. ACTUATOR. INOPERATIVE. AIRCRAFT IN BASE MAINTENANCE: FORWARD RIGHT FLIGHT ATTENDANT OXYGEN MASK DID NOT DEPLOY. REPLACED DOOR LATCH ACTUATOR PE (N324RA) - [SDR DALA2026062903843](https://openairdocs.org/sdr/DALA2026062903843), Jun 27, 2026: Boeing 717200. OXYGEN MASK. NO TEST. CAPT O2 MASK FAILED TEST. R & R FO'S CREW O2 MASK PER B717 AMM 35-23. (6545751) (AIRCRAFT GROUNDED). (N940AT) - [SDR DALA2026062703819](https://openairdocs.org/sdr/DALA2026062703819), Jun 24, 2026: Airbus A319114. OXYGEN MASK. DAMAGED. SCRATCHED CREW OXYGEN MASK OBSERVER POSITION ON COCKPIT. REMOVED CREW OXYGEN MASK POSITION 3RD OCCUPANT ON COCKPIT ON UN (N369NB) - [SDR ABXA20260615262](https://openairdocs.org/sdr/ABXA20260615262), Jun 15, 2026: Boeing 767281. STOWAGE BOX. DEFECTIVE. SUPERNUMERARY LEFT SEAT OXYGEN MASK BOX RESET TAB INOP. REMOVED AND REPLACED SUPERNUMERARY LEFT HAND SEAT OXYGEN MASK BO (N774AX) - [SDR UIEA2026061500500](https://openairdocs.org/sdr/UIEA2026061500500), Jun 11, 2026: Boeing 777F16. BUTTON. INOPERATIVE. 1ST OBS O2 MASK RESET BUTTON INOPERATIVE. SWAPPED 1ST OBS O2 MASK & STOWAGE BOX WITH 2ND OBS O2 MASK & STOWAGE BOX P (N702GT) - [SDR CALA2026060916949](https://openairdocs.org/sdr/CALA2026060916949), Jun 7, 2026: Boeing 737924ER. OXYGEN MASK. LEAKING. CREW O2 AT 400PSI FOUND SOURCE OF LEAK TO BE OBSERVERS MASK WAS NOT IN STOWED POSITION, WHICH CAUSED THE EMERGANCY SWITC (N69888) - [SDR FDEA202606060679](https://openairdocs.org/sdr/FDEA202606060679), Jun 6, 2026: Airbus A300F4605R. STOWAGE BOX. BROKEN. DURING REMOVAL OF FIRST OBSERVER SEAT FOUND O2 MASK WITH BROKEN MOUNTING SCREW. REMOVED AND REPLACED OBSERVER`S O2 BOX R (N681FE) - [SDR CALA2026060816913](https://openairdocs.org/sdr/CALA2026060816913), Jun 5, 2026: Boeing 7673CB. OXYGEN MASK. LEAKING. CREW OXYGEN PRESSURE LEAKING DURING FLIGHT FROM O2 MASK BEHIND C A ON ARRIVAL CREW NOTED; OXYGEN LEVEL AT 1620 PSI ON DE (N686UA) - [SDR UIEA2026060300430](https://openairdocs.org/sdr/UIEA2026060300430), Jun 2, 2026: Boeing 767375. OXYGEN MASK. INOPERATIVE. CENTER SUPERNUMERARY SEAT O2 MASK INOPERATIVE. REMOVED AND REPLACED CENTER SUPERNUMERARY O2 MASK IAW AMM 35-11-51. OPS C (N649GT) All 2,415: https://openairdocs.org/jasc/3510/reports.md ## Other codes in chapter 35 - [JASC 3500](https://openairdocs.org/jasc/3500): Oxygen System (180 reports) - [JASC 3520](https://openairdocs.org/jasc/3520): Passenger Oxygen System (2,733 reports) - [JASC 3530](https://openairdocs.org/jasc/3530): Portable Oxygen System (272 reports) - [JASC 3597](https://openairdocs.org/jasc/3597): Oxygen System Wiring (67 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.