So how do you clean the air-conditioning on a 737? Well a few gallons of water and some hot air.

We back flush the packs with water and use air from the APU to give the water some power to remove any rubbish that has been sucked in. On the whole we find labels and dead flies Anyway this is how it is done.
I only had my mobile the phone for these shots

Matt





These are the primary and secondary heat exchangers.


Here is a general view of the air con bay.