Crew Incapacitaion

[sneakykiwi]

I wanted to ask all those engineers out there if they could help with a problem. Recently I was involved in a flight in a twin turboprop, unpressurised aircraft in which both crew members nearly passed out within seconds. The flight was only at 10000ft and about 10 minutes into the flight.

So far during ground runs, nothing extraordinary has turned up.

Any ideas guys and gals?

[scarebus03]

Do I detect a little sarcasm or is this a genuine technical problem?

[sneakykiwi]

This is a genuine technical problem

[woptb]

How is the cabin heated ?

[finch]

Was an MOR raised ?
If this occurred as read then either the aircraft or crew should not be currently flying until the problem has a positive fix.

[sneakykiwi]

Heated and cooled through bleed air.

[woptb]

Sounds like a contamination problem.Any recent servicing,component changes involving engine or air con? A bit high maybe for external contamination such as crop spraying.

[Bodjit]

10,000ft above ground or sea level....... theres a difference.

[Rigga]

Get a CO2 Detector and place it near the heater outlets - It sounds like you have a leak to me.
I used to check/change them monthly as part of the maintenance schedule.
I thought all Piston (ooops!) aircraft were supposed to have one fitted? (All of 'mine' did!)

[sneakykiwi]

10000 AMSL of course.
Aircraft recently refurbished, so probably some work on aircon system.
No requirement (although I'll be making sure there is now) for a CO detector, only heating is through bleed air.
No odours during flight.

[Riccardo]

I can't see the CO thing being an issue - turbine bleed air is taken before combustion (typically 9th and 14th stage compressor). It's just outside air heated up by the energy of compression.

As suggested before - 10000' above ground or sea level would be good to know? Ok just read it!

Is it a dual instrument system ie two altimeters supplied by seperate pitot sources? If it's a single alti did the standby agree with the master? Does it have a FDR?

I can't think of anything contamination wise that would make the crew nearly pass out without feeling unwell first - oil, hydraulics, fuel are all very noticeable!

My 2p worth.:confused:

[sneakykiwi]

Dual Alt, both agreed.
Does have an FDR, but as far as I'm aware it hasnt been checked.