The APU engine is located in the aft end of the fuselage, behind the pressure bulkhead and below the horizontal stabilizer.
APU发动机安装于机身尾部、压力隔板后面及水平安定面下方。
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The purpose of the bulkhead is threefold: to seal the forward end of the motor, to retain the pyrogen igniter, and to act as a blowout plug in case of motor overpressurization (discussed earlier).