K.  Actuate and hold the GROUND SENSING TEST switch on the M338 module.
L.  Open AC STANDBY BUS POWER circuit breaker on P6-4 and check that:
(1)  
DC voltmeter reads more than 22 volts.

(2)  
AC voltmeter reads 115 + 5 volts ac.

(3)  
Frequency meter reads 400 + 10 Hz.

M.  Close AC STANDBY BUS POWER circuit breaker.
N.  Open DC STANDBY POWER TR circuit breaker on P6-5 and check that:
(1)  
DC voltmeter reads greater than 22 volts.

(2)  
AC voltmeter reads 115 + 5 volts ac.

(3)  
Frequency meter reads 400 + 10 Hz.

O.  Close DC STANDBY POWER TR circuit breaker.
P.  Release GROUND SENSING TEST switch on M338 module.
Q.  Set STANDBY POWER switch to OFF and check that:
(1)  
STANDBY POWER OFF light illuminates.

(2)  
STANDBY AC light extinguishes.

(3)  
STANDBY DC light does not illuminate when INDICATE-TEST switch is placed in INDICATE position.

(4)  
Both AC and DC voltmeters indicate 0-volt.

R.  Press MASTER CAUTION lights and check that MASTER CAUTION and ELEC lights extinguish.
S.  Set STANDBY POWER switch to BATT and check that:
(1)  
STANDBY POWER OFF light extinguishes.

(2)  
STANDBY AC light illuminates.

(3)  
STANDBY DC light illuminates when INDICATE-TEST switch is placed in INDICATE position.

(4)  
DC voltmeter reads greater than 22 volts.

(5)  
AC voltmeter reads 115 + 5 volts ac.

(6)  
Frequency meter reads 400 + 10 Hz.

T.  Restore standby power system to normal
(1)  
Set STANDBY POWER switch to AUTO and check that:

(a)  
DC voltmeter reads 26 + 4 volts dc.

(b)  
AC voltmeter reads 115 + 5 volts ac.

(c)  
Frequency meter reads 400 + 10 Hz.

(2)  
Set GROUND POWER switch to OFF and check that STANDBY POWER OFF light illuminates.

(3)  
Reset MASTER CAUTION and ELEC lights if necessary.

(4)  
Remove external power if no longer required (Ref. 24-22-0).

(5)  
Set BATT switch to OFF.

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24-54-0 Page 502  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Jun 20/88 

3. Test Standby Power System (Short Test)
A.  Verify EMER EXIT LIGHTS switch on P5 overhead panel is in OFF position.
CAUTION:  EMERGENCY EXIT LIGHTING CONTROL SWITCH MUST BE IN OFF POSITION BEFORE REMOVING POWER FROM AIRPLANE. IF LEFT IN ARMED POSITION ALL EMERGENCY LIGHTS WILL COME ON AND BATTERIES WILL DISCHARGE.
B.  Start APU (Ref. 49-11-0 MP) or provide 3-phase, 400-Hz, 115-volt power to external power receptacle.
C.  Set BATT switch to ON if using external power.
D.  Set DC meter selector switch to the following and check that DC voltmeter reads:
(1)  
Zero at TR3 position.

(2)  
Greater than 22 volts at BAT position.

(3)  
The same as at BAT position (or within 1/2 volt less) when at BAT BUS position.

E.  If using external power, set GROUND POWER switch to ON. If using APU generator driven power, set right and left APU GEN switches to ON.
F.  Set DC meter selector switch to the following and check that DC voltmeter reads:
(1)  
26 + 4 volts dc at TR3 position.

(2)  
The same as at TR3 position (or within 1/2 volt less) when at BAT BUS position.

G.  Set STANDBY POWER switch to OFF and check that STANDBY PWR OFF light illuminates.
H.  Set AC and DC meters selector switches to STBY PWR and check that AC and DC voltmeters read zero.
I.  Set STANDBY POWER switch to AUTO and check that:
(1)  
STANDBY PWR OFF light extinguishes.

(2)  
DC voltmeter reads 26 + 4 volts.

(3)  
AC voltmeter reads 115 + 5 volts.

(4)  
Frequency meter reads 400 + 10 Hz.

J.  Set GROUND POWER switch to OFF or set right and left APU GEN switches to OFF and check that:
(1)  
STANDBY PWR OFF light illuminates.

(2)  
AC and DC voltmeters read zero.

K.  Actuate and hold the GROUND SENSING TEST switch on M338 module and check that:
(1)  
STANDBY PWR OFF light extinguishes.

(2)  
DC voltmeter reads 26 + 4 volts.

(3)  
AC voltmeter reads 115 + 5 volts.

(4)  
Frequency meter reads 400 + 10 Hz.

504 
Jun 20/88  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  24-54-0 Page 503 
　
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