2022-04 · NASA ASRS report 1895384
Technicians reported a fire during aircraft O2 servicing.
Working ZZZZZ; had an ETOPS check that I was doing on Aircraft X at Gate XX. While doing that ETOPS check; I was called that Aircraft Y was coming to my gate GATE YY and the ETOPS would be done. The O2 was lower than the ETOPS limits and needed serviced. NAME and NAME1 were box and said they would help with it. They would bring over the bottles because I did not have a tug to pull the O2 cart. After Aircraft X was completed; I went to Aircraft Y as NAME and NAME1 pulled up and told them I would pull the CB listed MM XX-XX-XX-XXX-XXXX. After I pulled the breaker; I went in the E&E with NAME to shut off the bottles; we did a countdown and closed bottles at the same time. Needed the adapter for the service; had to run inside to the snap on box in the tool area of T1 for that. They proceeded with disconnecting lines and I gave them the service hose; with everything hooked up and communication was given I began as needed to open bottles to begin filling. With the okay to raise pressure aircraft bottle was roughly 1450; I had the service bottle around 1;550 PSI at highest point and before we could do anything else NAME and NAME1 came scrambling to get out; I immediately closed the bottle being used to service aircraft and with smoke seen we called control for the fire department.
While I was on shift in training; I was asked to assist NAME3 on Aircraft X with the ETOPS check finding of crew oxygen low. Needing servicing; AMM XX-XX-XY was used. I got the ladder; while other two Technicians opened breaker CEXXXXXXX and closed both crew oxygen bottles to off. As I went up to fwd E&E bay to see location of bottles; other Technicians got adapter and stated they wanted to service bottle on aircraft. Supply line was removed and connected to adapter for oxygen servicing cart. While oxygen was flowing I saw sparks at the top of crew oxygen bottle by the on off valve and I stated to get out and we rushed out of the access door. Oxygen service cart supply bottle was then closed and fire department was called as precautionary. Suspect faulty valve on crew oxygen bottle.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.
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