Brilliant, why didnt I think of that, crew compartments are toilets....
Let me rephrase this even more clearly than the first regulation.
It is a special requirement....
why have a special requirement when you cannot smoke in the crew compartment?
14 CFR 25.853 - Compartment interiors.
(f) Smoking is not allowed in lavatories. If smoking is allowed in any area occupied by the crew or passengers, an adequate number of self-contained, removable ashtrays must be provided in designated smoking sections for all seated occupants.
(g) Regardless of whether smoking is allowed in any other part of the airplane, lavatories must have self-contained, removable ashtrays located conspicuously on or near the entry side of each lavatory door, except that one ashtray may serve more than one lavatory door if the ashtray can be seen readily from the cabin side of each lavatory served.
Last edited by underfire; 6th Oct 2017 at 18:02.