Folks,
This question pops up over and over again. Let's take it one at a time:
(1) The pressure in the baggage compartment is exactly, I say again, EXACTLY the same as where you are sitting. Yes, that's right. EXACTLY THE SAME. It is the same where your bags are in the luggage compartment over your head, as it is in your lap, as it is in the cargo area right below your feet.
The hull is a tube, but the floor is not a pressure bulkhead. It is simply a lightweight structure for the seats to be mounted on.
The pressure is lower than it is at sea level, but well within tolerance for you, your bebe's, little old granny ladies, and your precious camera! (Unless you are flying too soon with your hair wet after diving, like MHK thinks you should, and then your veins are going to pop out of your head! :11: But that's another story, kids!)
(2) Now airflow, and consequently temperature maintenance, is a different story. Obviously, air FLOW is not as good as it is in the upper areas of the cabin. Why? Because you have "stuff" piled up everywhere. Since the air flows out of the overhead vents, down over you, through the sidewall vents at your feet, and down into the cargo area, where all of your "stuff" is piled up, the flow is just not as good down there!
It does not, I repeat, NOT get cold enough under normal circumstances to freeze Fluffy into a dog-sicle! It is cooler, sometimes even downright chilly, but not life threatening.
The procedures for carriage of live animals dictate that the rampies leave space around the cages of live animals for better airflow and temperature control. Most modern jet aircraft have cargo area heaters which must be on if live animals are being carried. Again, even if they are left off, your gear will not reach Arctic temperatures, by any means.
No matter what your friend the flight attendant says, leaving the cargo area heater either on or off will not affect the cost to the company of that particular flight. The system is, in almost all cases, just a valve that ports a little more warm air to that area.
Now, leaving an airconditioning pack off will definitely affect the cost of the flight. If we leave a pack off for "fuel economy", we have to fly at a much lower altitude. The engines are not as efficient, we chew up a LOT more fuel, and the fuel economy stats for that flight go down the dumper! Why in Hell would we want to do THAT??? I assure you that if a captain regularly turned off a pack, and flew at lower altitudes, he would soon be standing in front of the Jefe de Piloto's desk, being yelled at!!! :11:
Take it from me, folks, that this is the way things ACTUALLY work!
To paraphrase Mr. Natural: "Don't try this at home, kids. Leave it to the professionals!
