900 Electrical Flashcards
Each IDG consists of
A constant speed drive and a generator
The IDG automatically disconnects when
tempurature or torque limits are exceeded.
The ADG continues to operate and supply power to the ADG bus until what airspeed?
Approximately 140 kts
Can the ADG deployed on the ground?
Automatic deployment is inhibited on the ground by a wait on wheels switch.
The power supply priority for AC electrical is
On side generator
APU
Off side generator
Ground power
What power sources are available for the service configuration
Either external power or the APU generator
What buses are powered in the service configuration
AC service bus
The ADG is automatically deployed if
there is a loss of power to both AC bus 1 and 2.
The ADG bus supplies power to
The AC Essential bus
Hydraulic pump 3b
Flaps and slats at half speed
Pitch trim channel 2
Main battery amp and volt
17 amp hour /24 volt nickel cadmium battery
APU battery amp and volt
43 amp hour. 24 V nickel cadmium battery
From what source is each battery charged?
The main battery is charged by AC bus one.
The APU battery is charged by AC service bus.
The APU generator is driven by
Directly by the APU gearbox
What powers the DC emergency bus
The DC battery bus and the APU batt direct bus (Continuously)
Failure of one Essentil TRU?
ESS tie connector closes
What will occur if we lose both Essential TRU’s
Cross tie closes