(a)  
Set the BATTERY switch on the P5 panel to the ON position.

 (b)  
Set the STANDBY POWER switch on the P5 panel to the AUTO position.

 (c)  
Make sure the GND TESTS switch on the P461 maintenance panel is set to the NORM position.

 (d)  
Open this circuit breaker and attach a DO-NOT-CLOSE tag:

 1)  P6 Main Power Distribution Panel a) 6H5 FIRE EXTINGUISHER APU
 S 725-012
 (3)  
Do the test of the fire switch shutdown:

 (a)  
Turn the APU control switch on the P5 panel to the ON position.

 (b)  
Pull the fire switch on the P5 panel.

 NOTE: The APU ADVISORY and the APU STATUS messages will show.
____
 (c)  
Push the APU fire switch on the P5 panel back to its usual position.

 (d)  
Turn the APU control switch on the P5 panel to the OFF position.

 S 975-053
 (4)  
Erase the APU STATUS message (AMM 31-61-00/201).

 S 865-047

 (5)  
Set the circuit breaker and switches:

 (a)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker.

 1)  P6 Main Power Distribution Panel a) 6H5 FIRE EXTINGUISHER APU

 (b)  
Set the STANDBY POWER switch on the P5 panel to the OFF position.

 (c)  
Set the BATTERY switch on the P5 panel to the OFF position.

 S 865-048
 (6)  Remove the electrical power if it is not necessary for other operations (AMM 24-22-00/201).
 TASK 49-11-00-705-017
 5.  APU Ground Test________________
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 A. General
 (1)  
The APU Ground Test sends a discrete input to the APU controller. This input makes the APU controller come on. After the APU controller comes on, it will do a start sequence. The start sequence will do a byte test on the APU controller. The start sequence will also do a funtional check on the stepper motor and resolver for the fuel metering unit (FMU). The stepper motor will open to allow minimum fuel flow.

 B.
References

 (1)  
AMM 24-22-00/201, Electrical Power

 (2)  
AMM 31-61-00/501, Integrated Display System (IDS)

 (3)  
AMM 32-09-02/201, Air/Ground Relays

 (4)  
AMM 45-10-00/501, Central Maintenance Computer (CMC)

 C.
Access

 (1)  
Location Zone
 221 Control Cabin, LH
 222 Control Cabin, RH

 D.
Preconditions

 S 865-059
 (1)  
These conditions are necessary for this task:

 (a)  
Electrical Power On (AMM 24-22-00/201).

 (b)  
Integrated Display System (IDS), serviceable (AMM 31-61-00/501).

 (c)  
Central Maintenance Computer (CMC), serviceable (AMM 45-10-00/501).

 (d)  
Airplane must be in the ground mode (AMM 32-09-02/201).

 E.
Prepare for the Test

 S 865-019
 (1) Supply external ground power to the airplane (AMM 24-22-00/201).
 NOTE: You cannot operate the APU and do the APU ground test.
____
 S 865-018
 (2)  
Make sure these circuit breakers are closed:

 (a)  
P6 Main Power Supply Panel
 1) 6K18 APU ALTN CONT

 (b)  
P83 Panel, E8 Aft Equipment Center
 1) APU PRIMARY CONT

 (3)  
Set the BATTERY switch on the P5 panel to the ON position.

 (4)  
Set the STANDBY POWER switch on the P5 panel to the AUTO position.

 S 865-021
 S 865-022
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