IV Scan text A to fill in the spaces with the prepositions.

1 Switching __ power supply systems is automatic __ pilot action.

2 However, the pilot can selectively isolate power sources and the distribution

system __ emergency situations.

3 When operating normally, the buses receive power __ a series __ contacts and

logic situations, depending __ the power source(s) __ use.

4 The GPM prevents application __external power not __tolerances.

5 If an undervoltage, overvoltage, underfrequency, overfrequency, or a phase

reversal fault occurs, the GPM disconnects external power __ the power

distribution system.

6 When all the power parameters are __ tolerance, the GPM relay energizes,

supplying 28 V dc __ the GPM transformer-rectifier __ pin F __ the external

power panel.

7 External electrical power is automatically inhibited __ some systems when

external air conditioning is not being supplied __ the aircraft.

8 __ external power connected and engine start initiated, the left generator comes

__ line when all parameters are __ tolerance.

9 The left TR unit receives power __ the left main bus.

10 This ensures all systems are available __safe flight and mission

accomplishment.

11 If both engines flame __, the hydraulic pressure produced __ wind milling

engines cannot operate the hydraulic motor at optimum output.

12 Equipment __ essential ac and dc number one buses must be capable __

operating __ below normal voltage __ an emergency.

13 Dc power goes __ the dc essential power transfer relays__ the dc essential and

AFCS buses. 14 This configuration enables the flight crew __ jettison aircraft

stores, communicate, and destroy classified equipment __taking emergency

escape procedures.