(m)  
Push the GRND SERV BUS switch on the forward attendant's panel P21. 1) Make sure the light in the switch stays off.

 (n)  
Start the APU (AMM 49-11-00/201).

 (o)  
Make sure the yellow OFF light in the APU GEN switch (P5) stays on.

 (p)  
Push the APU GEN switch (P5) to the ON position. 1) Make sure these lights are off:

 a) The two BUS OFF lights (P5). 2) The OFF light in the APU GEN switch (P5). 3) Make sure the yellow OFF lights in the L and R GEN CONT
 switches (P5) stay on.
 (q)  Push the L GEN CONT switch (P5) to the ON position.
 1)  Make sure these lights are off: a) The OFF lights in the L GEN CONT and APU GEN switches. b) The two BUS OFF Lights (P5).
 2)  Make sure the yellow OFF light in the R GEN CONT switch (P5) stays on.
 (r)  
Push the GRND SERV BUS switch (P21). 1) Make sure that the light in the switch stays off.

 (s)  
Push the R GEN CONT switch (P5) to ON.

 1)  Make sure these lights are off: a) The OFF lights on the L, R and APU GEN switches (P5). b) The two BUS OFF lights (P5).

 (t)  
Shutdown the left engine (AMM 71-00-00/201). 1) Make sure the yellow DRIVE light in the L GEN DRIVE DISC switch (P5) comes on. 2) Make sure the yellow OFF light in the L GEN CONT switch (P5) is on.

 3)  Make sure these lights are off: a) The OFF lights in the R and APU GEN switches (P5). b) The two BUS OFF lights (P5).

 (u)  
Shutdown the right engine (AMM 71-00-00/201). 1) Make sure the yellow DRIVE light in the R GEN DRIVE DISC switch (P5) comes on. 2) Make sure the yellow OFF lights in the L and R GEN CONT switches (P5) are on.

 3)  Make sure these lights are off:
 a) The OFF light in the APU GEN switch (P5).
 b) The two BUS OFF lights (P5).

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757 MAINTENANCE MANUAL
 (v)  
Remove the APU generator power from the main ac buses.

 (w)  
Remove the power from the external power cable.

 S 845-049
 (6)  Put the airplane in the ground mode (AMM 32-09-02/201).
 F. Autoland Mode Test
 S 725-050
 (1)  Do a check of the autoland mode:
 (a)  
Remove the electrical power from the main ac buses (AMM 24-22-00/201).

 (b)  
Open these circuit breakers in the P11 panel and attach the DO-NOT-CLOSE tag: 1) 11D6, CAT III BUS ISOL BAT 2) 11R3, CAT III BUS ISOL LEFT 3) 11R30, CAT III BUS ISOL RIGHT

 WARNING: DO NOT OPEN THE MAIN POWER DISTRIBUTION PANEL P6 WHEN THE
_______ ELECTRICAL POWER IS ON THE AIRPLANE. HIGH VOLTAGE IN THE PANEL CAN CAUSE INJURY.
 (c)  
Open the main power distribution panel P6.

 (d)  
Remove the ISOLATION REQUEST RELAY, K122, in the P6. 1) Keep the ISOLATION REQUEST RELAY for the installation.

 (e)  
Install the adapter in the location of the ISOLATION REQUEST RELAY, K122, in the P6 panel. 1) Set the switch on the relay adapter to the ON position.

 (f)  
Close the P6 panel.

 (g)  
Supply integrated drive generator power to the main ac buses (AMM 24-22-00/201).

 (h)  
Make sure the Left and Right BUS TIE switches on the P5 panel are in the AUTO position. 1) Make sure the ISLN light in each BUS TIE switch is off.

 (i)  
Make sure the L and R main AC BUS OFF lights (P5) are off.

 WARNING: BE CAREFULL WHEN YOU WORK IN THE P11 PANEL.
_______ HIGH VOLTAGE IN THE PANEL CAN CAUSE INJURY TO PERSONS.
 (j)  Open the P11 panel to get access to the circuit breaker terminals. 1) Measure 28 |3 volts dc at terminal 1 of the FLT CONT CMPTR
 SERVO C circuit breaker (11E21 or 11E20) on P11.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 04 Page 522 ú May 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
　
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