The alphanumeric display shows only voltage and frequency when you select one of these:
- STBY PWR
- GRD PWR
- INV.
The selector must be in the TEST position to use the P5-13 BITE.
DC Meter Selector
The DC meter selector is a rotary selector with seven positions. Each position, except the TEST position, is related to a DC power source or DC bus.
Voltage (DC VOLTS) and load (DC AMPS) show on the alphanumeric display when you put the selector in any of the TR positions or the BAT position.
When the selector is in the BAT BUS or STBY PWR positions, the display shows voltage only.
The selector must be in the TEST position to use the P5-13 BITE.
BAT DISCHARGE Light
The amber BAT DISCHARGE light shows battery discharge. The BAT DISCHARGE light temporarily comes on during an APU start with battery power.
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737-600/700/800/900 TRAINING MANUAL 737 GENERAL -- ELECTRICAL METERS, BATTERY, AND GALLEY POWER MODULE
See the APU chapter for more information about APU starting.(AMM PART I 49)
TR UNIT Light
The amber TR UNIT light shows transformer rectifier unit (TRU) failure. The TR UNIT light comes on for any one of these reasons:
-Any TRU fails on the ground, or
-TRU 1 fails in flight, or
-TRU 2 and TRU 3 fail in flight.
ELEC Light
The ELEC light shows DC system or standby power system has a failure. You use BITE to find the failure. The amber ELEC light comes on only when the airplane is on the ground.
MAINT Switch
You use the maintenance switch during BITE. The BITE operates only on the ground. The maintenance switch is a momentary push-button switch.
LED Alphanumeric Display
The LED alphanumeric display shows this type of information:
-DC parameters (current, voltage)
-AC parameters (current, voltage, frequency)
-As many as two lines of maintenance fault
messages.
The selectors and the maintenance switch control what shows on the alphanumeric display.
Battery Switch
The battery energizes these buses and components when you put the battery switch to the ON position:
-Switched hot battery bus
-Battery bus
-Static inverter
-AC standby bus
-DC standby bus
-P5-13 alphanumeric display.
The battery switch is a two-position switch. The cover, when down, is a guard for the switch in the ON position. You must lift the cover before you move the switch to the OFF position.
Galley Switch
The galley switch controls galley electrical power. The switch is a two-position switch.
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LED ALPHANUMERIC DISPLAY
MAINTENANCE SWITCH
AC METER SELECTOR
GALLEY POWER SWITCH
ELECTRICAL METERS, BATTERY AND GALLEY POWER MODULE (P5-13) 737 GENERAL - ELECTRICAL METERS, BATTERY, AND GALLEY POWER MODULE
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737-600/700/800/900 TRAINING MANUAL 737 GENERAL -- GENERATOR DRIVE AND STANDBY POWER MODULE
General
The generator drive and standby power module (P5-5) has these indications and manual controls:
-IDG low oil pressure indication (DRIVE lights) -Indication that the battery bus or either standby
bus do not have power (STANDBY PWR OFF light)
-Generator drive disconnect switches
-Standby power switch.
DRIVE Light
The amber DRIVE light comes on when the IDG oil pressure is less than the operation limit.
Generator Drive Disconnect Switch
The generator drive disconnect switch operates the disconnect mechanism for its IDG when the respective engine start lever is in the idle position. This removes engine accessory gearbox power from the IDG. There is one switch for each IDG. Each switch is spring-loaded to the NORMAL position. The DISCONNECT position is a momentary position. The cover is a guard for the switch in the NORMAL position. Break-away wire usually keeps the cover down. You must lift the cover and break the wire to move the switch.
STANDBY PWR OFF Light
The amber STANDBY PWR OFF light comes on when any of these buses do not have power:
-AC standby bus
-DC standby bus
-Battery bus.
Standby Power Switch
The standby power switch gives you manual control of the AC and DC standby power bus sources. The switch is a three-position switch. The switch is usually in the AUTO position. The cover is a guard for the switch in the AUTO position.
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