Pressurization and Air-Conditioning

The airplane is equipped with a pressurization system. Pressurization of the cabin is accomplished by bleeding high pressure air from one of the compressor stages. A knob on the air conditioning panel is used to select the source of bleed air into the pressurization system. For pressurization, the desired cabin altitude is set on the pressurization control panel and the cabin pressure is subsequently controlled through an air outflow valve by the pressurization control unit to achieve the set cabin altitude. When setting the cabin altitude, a small window in the bottom of the pressurization control panel will indicate the altitude at which maximum allowed pressure will be achieved and above that altitude, the cabin altitude will then increase above the set cabin altitude.

The bleed are options are:

• RAM (not simulated)
• OFF (no bleed air is tapped off the engines)
• LH (bleed air is tapped from the left engine)
• BOTH (bleed air is tapped from both engines)
• RH (bleed air is tapped from the right engine)

Many times prior to takeoff, an MU-2 pilot will turn off the air selector switch to maximize power and then once airborne, turn the system on. If you fly at a sufficiently high altitude with the air selector switch set to off, you will neglect to pressurize your cabin and can experience a black-out in x-plane if your preferences are set for that.