I am very interested in the 737 combi models and want to learn more about how they worked in practice. For the 737 Combi, How did changing the proportions of the passenger vs cargo areas work?
- I have read that regulations require passenger areas to be maintained at higher pressures than cargo areas in order to prevent potential fumes from reaching the passengers- is that true? If so, how does that work in terms of the air pack design and other aspects of the cabin air design?
- Could operators change back and forth the proportion of floorspace that they dedicated to cargo vs passengers, or was it semi-permanently fixed? If it could be changed in normal operations, about how long did it take or how many man hours?
- Could the bulkhead between the passenger and cargo areas be located at any point inside the aircraft ("infinitely variable bulkhead location" you might say) or were there a certain number of fixed points that the bulkhead could be positioned?
- For 737 combis operated in a 100% passenger configuration, what did the cabin look like next to the door? Was the cargo door basically fully finished as though it was any other part of the cabin, or was it more industrial looking/louder/colder?