(g)  
Push the right BUS TIE switch (P5) to the AUTO position. 1) Make sure the yellow ISLN light in the switch is off. 2) Make sure the ON light in the GRND SERV BUS switch is off.

 (h)  
Push the GRND SERV BUS switch on the P21 panel. 1) Make sure the ON light in the switch stays off. 2) Make sure the inspection lights for the nose wheel well are

 on.
 G.  The Air Mode Test
 S 725-011
 (1)  Do the air mode test:
 (a)  
Make sure the NLG W/W INSP LT SWITCH S324 on the P63 panel is in the ON position. 1) Make sure the inspection lights for the nose wheel well are

 on.

 (b)  
Supply APU generator power to the 115V ac buses (AMM 24-22-00/201). 1) Make sure the two BUS TIE switches (P5) are in the AUTO

 position.
 2)  Make sure these lights on P5 are off: a) The ISLN lights in the two BUS TIE switches. b) The two BUS OFF lights.
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757 MAINTENANCE MANUAL
 c)  Make sure the ON light in the GRND SERV BUS switch on the P21 panel is off.
 (c)  
Push the GRND SERV BUS switch (P21). 1) Make sure the ON light in the switch stays off.

 (d)  
Put the airplane in the air mode (AMM 32-09-02/201).

 1)  Make sure the inspection lights for the nose wheel well are off.

 (e)  
Push the GRND SERV BUS switch on the P21 panel. 1) Make sure the ON light in the switch stays off.

 (f)  
Open this circuit breaker on the P32 panel:
 1) 32A8, R GEN GND SVCE BUS
 2) Make sure these lights are off:

 a) The ON light in the GRND SERV BUS switch. b) The 115V GND SVC HOT BUS WARNING light on the P33 panel.

 (g)  
Push the GRND SERV BUS switch on the P21 panel.

 1)  Make sure these lights are off: a) The ON light in the GRND SERV BUS switch. b) The 115V GND SVCE HOT BUS WARNING light on the P33
 panel.
 (h)  Close this circuit breaker on the P32 panel: 1) 32A8, R GEN GND SVCE BUS 2) Make sure the red 115V GND SVCE HOT BUS WARNING light on
 the P33 panel is on. 3) Make sure the ON light in the GRND SERV BUS switch is off.
 S 845-012
 (2)  Put the airplane in the ground mode (AMM 32-09-02/201).
 (a)  
Make sure the inspection lights for the nose wheel well are on.

 (b)  
Put the NLG W/W INSP LT SWITCH, (S324) (P63) to the OFF position. 1) Make sure the inspection lights for the nose wheel well go

 off.

 (c)  
Stop the APU (AMM 49-11-00/201).

 H.  The Load Test
 S 725-013
 (1)  Do the load test:
 (a)  Make sure these lights are off: 1) The OFF light in the APU GEN switch (P5).
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MAINTENANCE MANUAL

 2) The two yellow BUS OFF lights (P5).
 (b)  
Put the EICAS computer switch (P9) to the AUTO position.

 (c)  
Push the ELEC/HYD display switch on the EICAS maintenance panel (P61). 1) Make sure these indications for the APU show on the EICAS

 display:
 a) AC-V = 110 to 123
 b) FREQ = 400 |5

 (d)  
Do these steps until the EICAS display shows a LOAD of 0.50 minimum for the APU/BAT power. 1) Make a note of the switches pushed to ON in the steps

 below. 2) These switches will be pushed to OFF at the end of the test.
 CAUTION: DO NOT OPERATE THE BOOST PUMPS WITH THE FUEL TANKS EMPTY.
_______
 DAMAGE TO THE BOOST PUMPS CAN OCCUR.

 (e)  
Put these switches on the fuel management control panel (P5) to the ON position. 1) L AFT PUMP 2) L FWD PUMP 3) R AFT PUMP 4) R FWD PUMP 5) LEFT C PUMP 6) RIGHT C PUMP

 (f)  
Push these switches on hydraulic system control panel (P5) to the ON position: 1) L ELEC HYD PUMP 2) C ELEC 1 HYD PUMP 3) C ELEC 2 HYD PUMP 4) R ELEC HYD PUMP
　
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