Users of EDS systems should be aware of another issue - known by MH but not
advertised. Several units (quantity unknown but could be many) were
calibrated using an incorrect curve after a change in technical staff.
These units resulted in insufficient supply of oxygen with every breath and
resulted in mild to moderate hypoxia.
Sending back to the factory gets the problem resolved easily. S'funny that
there was no recall of units.....
Might be worth calling the factory to check serial numbers?


"Karl Striedieck" wrote in message
...
I had the same problem. EDS knew of the situation and fixed it for free.

Karl Striedieck

"Eric Greenwell" wrote in message
...
Philip Plane wrote:

Hi,

I've recently had two failures of newish MH EDS oxygens systems. The
units gave the fault alarm with every breath. I checked one
on the ground on the 'N' setting and it faulted with every breath.
The other failure was intermittant over several hours.

We checked the plumbing and changed the battery. Didn't help.

Both failures 'fixed' themselves. The intermittant unit worked
fine on the next flight several days later. The unit I checked
worked on the next flight after the pilot sniffed hard a few times to
get it started.

Anyone else noticed this sort of thing? Any ideas on what is causing
it and how to prevent it.

I suggest you contact MH by phone or email, and describe the symptoms as
carefully as possible. My guess is moisture, and if some is still
present, it could cause a real problem if the unit gets below freezing in
a wave flight. In any case, oxygen is too important to leave to guesses,
so contact MH.


--
Change "netto" to "net" to email me directly

Eric Greenwell
Washington State
USA