AIRCRAFT OXYGEN MAINTENANCE
AVIATION OXYGEN MAINTENANCE for PRESSURIZED factory civilian aircraft—with service ceilings above FL250—includes an FAA overhaul/repair/inspection schedule for all backup emergency depressurization oxygen systems—which consists of an oxygen cylinder assembly and diluter/pressure demand crew masks.
CIVILIAN AIRCRAFT OXYGEN TANKS—CYLINDERS—BOTTLES
are manufactured by a small handful of factories in the USA. They are sold almost exclusively*** to aircraft manufacturers which in turn place them with proprietary valves/regulators for installation as an assembly into each of their pressurized factory aircraft. Each aircraft produced has a specific assembly part number approved for use in that particular aircraft. That PN must be placed onto the Original Equipment List of every original Aircraft Owner's Manual. All aircraft oxygen assemblies in factory aircraft must have 8130 or EASA certificates, with few exceptions.
CIVILIAN AIRCRAFT OXYGEN CREW MASKS
for pressurized aircraft are also manufactured by a small handful of USA factories:
- SAFRAN (AKA ZODIAC –AVOX—SCOTT—INTERTECHNIQUE) or
- ROCKWELL (AKA BE AEROSPACE, PURITAN BENNETT, ZEP)
- AEROX (AKA SHAW)
They are then sold to aircraft manufacturers for installation in their factory aircraft which must adhere to the maintenance schedules assigned by the OEMs. See also: diluter demand/pressure demand crew masks.
The maintenance schedules for both the masks and the oxygen cylinder assemblies are set by the product manufacturers—and adhered to by the aircraft manufacturers—in coordination with the various international aviation authorities. **
All aircraft manufacturers will be members of GAMA (General Aviation Manufacturer's Assn) i.e. BOEING—AIRBUS—BOMBARDIER—GULFSTREAM - BELL HELI—DEHAVILLAND -TEXTRON (CESSNA—PIPER—HAWKER) - MOONEY—PIAGGO—HONDAJET—SYBERJET—DASSAULT FALCON etc.
CAUTIONS: The inspection, repair and/or overhaul of aircraft oxygen equipment can ONLY be performed by specific FAA Licensed Repair Stations which will have the CMM (component maintenance manual) , equipment and license to 8130/EASA recertify specific components. Not all FAA Repair Stations hold these CMMs. The most common error made by owner/operators is to send out their assemblies for tank hydrotest to a shop not so licensed—with the common result being a blown valve. A "hydrotest facility DOES NOT HAVE the CMM, equipment or license to even HANDLE an aircraft oxygen regulator or valve.
EXCEPTIONS: 1) There are many older PIPER & CESSNA (TEXTRON) high performance aircraft—with service ceilings above FL250 to FL310—which are UNPRESSURIZED— have been grandfathered for use of constant flow crew masks. Most owner/operators of these aircraft have opted to upgrade to the diluter demand equipment currently required by the FAA for flights above FL250. 2) Factory aircraft with service ceilings to FL180 can use the efficient Oxysaver Cannulas for the best comfort and oxygen durations.
3) Factory aircraft with service ceilings to FL250 can use constant flow crew masks. Unless your constant flow crew masks have an 8130 certification, they are considered disposable with a service life of five years.
**FAA (USA), EASA (EU/JAA), ICAO (UN), CAA (UK, China), TC (Canada) etc
***oxygen tanks are also sold to qualified approved FAA facilities only— for production of PMA'd aftermarket replacement tanks.