Originally Posted by
Airbubba
This appears to be a variation of one of the old lavatory privacy pranks that pilots would play on flight attendants. Years ago on the 727 a gullible stewardess would be called to the cockpit. After some conversation the captain would have the FE 'check' to see if the forward lav was unoccupied so he could go back. The FE would open some panel (was it fuel dump?) on the aft cockpit bulkhead and pretend to look into the lav to verify that it was available. 'Not many people know about this' etc. and the word would quickly spread among the cabin crew.
Yes it was (grey/red) panel.
