AC and DC Metering Panel
YA801 -YA803
Copyright . The Boeing Company. See title page for details.
6.10.4 September 26, 2003
Electrical -Controls and Indicators 737 Flight Crew Operations Manual
YA613 -YA722, YA809 -YC413
Copyright . The Boeing Company. See title page for details.
June 1, 2005 6.10.5
Electrical -Controls and Indicators 737 Flight Crew Operations Manual
YD651 -YK104
DC Ammeter
Indicates amperage of source selected by DC meters selector.
DC Voltmeter
Indicates voltage of source selected by DC meters selector.
AC Ammeter
Indicates amperage of source selected by AC meters selector.
Frequency Meter
Indicates frequency of source selected by AC meters selector.
Copyright . The Boeing Company. See title page for details.
6.10.6 March 28, 2005
Electrical -Controls and Indicators 737 Flight Crew Operations Manual
AC Voltmeter
Indicates voltage of source selected by AC meters selector.
Battery Discharge (BAT DISCHARGE) Light
Illuminated (amber) – with BAT switch ON, excessive battery discharge detected.
TR UNIT Light
Illuminated (amber) – . on the ground – any TR has failed.
.
in flight –
.
TR1 failed; or
.
TR2 and TR3 failed.
Electrical (ELEC) Light
Illuminated (amber) – a fault exists in DC power system or standby power system. Note: Operates only with airplane on ground.
Maintenance Test (MAINT) Switch
Used by maintenance.
DC Meters Selector
Selects DC source for DC voltmeter and DC ammeter indications. TEST – used by maintenance.
Battery (BAT) Switch
OFF –
.
removes power from battery bus and switched hot battery bus when
operating with normal power sources available
.
removes power from battery bus, switched hot battery bus, DC standby
bus, static inverter, and AC standby bus when battery is only power
source.
ON (guarded position) –
.
provides power to switched hot battery bus
.
energizes relays to provide automatic switching of standby electrical
system to battery power with loss of normal power.
Copyright . The Boeing Company. See title page for details.
Electrical -Controls and Indicators 737 Flight Crew Operations Manual
AC Meters Selector
Selects AC source for AC voltmeter, AC ammeter and frequency meter indications
TEST – used by maintenance.
GALLEY Power Switch
OFF – removes electrical power from galleys.
ON – supplies electrical power to galleys when AC transfer busses are powered.
CAB/UTIL Switch
OFF – removes electrical power from galley and cabin equipment systems including:
.
all 115V AC galley busses
.
left & right recirculation fans
.
fwd and aft door area heaters
.
drain mast heaters
.
lavatory water heaters
.
logo lights
.
potable water compressor
.
115V AC shaver outlets when installed ON – supplies electrical power to galley and cabin equipment systems.
IFE/PASS SEAT Switch
OFF – removes electrical power from installed components of the passenger seats and in-flight entertainment systems including:
.
115V AC audio entertainment equipment
.
115V AC video entertainment equipment
.
cabin telephone equipment
.
FAX machine
.
28V DC video equipment and passenger seat electronic outlets
YK101 - YK104
.
ACARS printer
ON – supplies electrical power to installed components of the passenger seats and in-flight entertainment systems.
Copyright . The Boeing Company. See title page for details.
6.10.8 June 1, 2005
Electrical -Controls and Indicators
Generator Drive and Standby Power Panel
Generator Drive (DRIVE) Lights
Illuminated (amber) – Integrated drive generator (IDG) low oil pressure caused by one of the following:
.
IDG failure
.
engine shutdown
.
IDG automatic disconnect due to high oil temperature
.
IDG disconnected through generator drive DISCONNECT switch.
Generator Drive Disconnect (DISCONNECT) Switches (guarded)
Disconnects IDG if electrical power is available and engine start lever is in IDLE. IDG cannot be reconnected in the air.
STANDBY Power Off (PWR OFF) Light
Illuminated (amber) – one or more of the following busses are unpowered:
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