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How Is It Possible?  
User currently offlinePopee From Pakistan, joined Feb 2001, 151 posts, RR: 0
Posted (12 years 10 months 3 weeks 2 days ago) and read 1919 times:

Last week during preflight checks of B747-300, I noted that Pax Oxygen pr was low. I sent tech to change the bottle(s) with low pr. He later on told me that three out of five bottles were having pr of 1100 psi each and rest of the two were having 2000 psi each. Going through previous tech logs, I noticed same three bottles getting replaced almost fortnightly. Question is if there is leakage in the system why all five bottles r not getting depleted , being in parallel ? Why these three ? Anyone out there to help me out ...


2 replies: All unread, jump to last
 
User currently offlineAir2gxs From , joined Dec 1969, posts, RR:
Reply 1, posted (12 years 10 months 3 weeks 1 day 18 hours ago) and read 1857 times:

I don't know the -300, but suspect a check valve somewhere in the system.

User currently offlinePopee From Pakistan, joined Feb 2001, 151 posts, RR: 0
Reply 2, posted (12 years 10 months 3 weeks 1 day 15 hours ago) and read 1840 times:

As such there is no check vlv in the sys.


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