747-400 Cockpit quiz...

[balaton]

Could somebody please identify that white box with two "slots" in it at the linked picture upper left corner? (Behind the observer's gasper)
Photos: Boeing 747-436 Aircraft Pictures | Airliners.net

[fire wall]

samples air from cockpit for temp modulation.
times when cockpit temp is difficult to maintain then take off cover and clean foam type insert.

[balaton]

Oh... that was quick and precise, many thanks,
b

[Pontius]

Do I win a prize for knowing that and the name of the Captain?

[balaton]

I've anticipated a reply like this... No secrets on this forum... I like it.
Cheers,
b

[balaton]

...at last the Britts' got some snow this winter to fulfil their fantasy...

[M2dude]

Yep, standard stuff for any A/C temperature control system. A sampling fan draws air through a filter (foam in most Boeings) over the temperature control and indications sensors. Failure of the fan or blockage of the filter causes the sensors to mis-read. Single sheet loo paper is a good test