Long running OBOGS issues: got it.
Contamination: got it.
@Spazsinbad: TMS ~ Type/Model/Series. Sorry, lapsed into old USN Acronym-speak.
Did someone change a vendor, or a parts supplier, or make an airframe mod?
Is this the usual "we can never get any spare parts to fix the damned things properly" that happens in various budgetary cycles? I only had two experiences with OBOGS, both in a T-45, my other O2 was with a mixer or diluter with the chance to go 100 full )2 for emergencies. (LOX or other O2 bottles, model dependent).
This isn't new technology: why is this not fixed? I think that's what has the pilots frustrated. It also, apparently, is not a new problem.
Heard rumor that an ejection last year was due to OBOGS malfunction. Will try to find a link.