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PM-121
4-15 Change 3
Pilot's Manual
Learjet 31A
tion and warning annunciations are inhibited during starter engagement.
A malfunction which affects the accuracy of the indicator will cause
EE.E to be displayed in the VDC readout and dashes "-" in all other
readouts.
Whenever the left and right inverters are out-of-phase, a "C" will flash
in the least significant digit of each VAC display.
The electric power monitor is operative during EMER BUS mode.
EMERGENCY BUS SYSTEM
An emergency bus system is installed to provide 28 VDC,115 VAC, and
26 VAC to selected systems in the event of a dual generator system failure
or to quickly de-energize and isolate all nonessential equipment in
the event of electrical smoke or fire. The system uses the aircraft's batteries
to supply DC power to the DC equipment on the emergency bus
and uses the left inverter to provideAC power to AC equipment on the
emergency bus. Aircraft 31-035 thru 31-065, except 31-061, AC and DC
emergency bus circuit breakers are denoted by a red collar. Aircraft 31-
061, 31-066 and subsequent, AC emergency bus circuit breakers are denoted
by segmented red/white rings on the overlay and DC circuit
breakers are denoted by red rings on the overlay. The EM BUSTIE is
located on the copilot's circuit breaker panel. The emergency bus system
control circuits operate on 28 VDC supplied by the batteries
through the EMER BUSCONT circuit breakers in the pilot's and copilot's
circuit breaker panel.
416
PM-121
Change 3
Learjet 31A
L EMERGENCY BUS
FLOOD LTS t
L 26 VAC t(31-035 thru 31-060,
31-062 thru 31-065)
EL PWR MON
L INV
EMER BAT 1
L FIRE DET
L FIRE EXT
L IGN
L FW SOV
L JET PUMP-XFR VAL
PILOT A/S
PILOT ALTM VSI
ADC 1
WARN LTS
PRI PITCH TRIM
L STALL WARN
WHEEL MASTER
L ITT
L PILOT HT
L BLEED AIR
L EMER PRESS
L AUDIO
COMM 1
NAV 1
ADF 1
' 26 VAC
t 115VAC
Pilot's Manual
AHS 2'
STBY HSI '
EMER BAT 2
R FIRE DET
R FIRE EXT
R IGN
R FW SOV
R JET PUMP-XFR VAL
XFLO VALVE
FUEL QTY
AHS 2
STBY HSI
WARN LTS
SEC PITCH TRIM
FLAPS
SPOILER
R STALL WARN
TRIM-FLAP IND
WARN HORNS
GEAR
R ITT
R PILOT HT
R BLEED AIR
R EMER PRESS
R AUDIO
NOTE: Circuit Breakers on Battery Buses are powered regardless of EMER BUS
Switch position . Also, loads powered by the emergency batteries will operate regardless
of EMER BUS Switch position (refer to EMERGENCY POWER SYSTEM).
PM-121
4-17
Change 3
Pilot's Manual
Learjet 31A
EMER BUS SWITCH
The EMER BUS switch on the pilot's switch panel is used to select the
power source for the emergency buses. The switch has two positions-
EMER BUS andNORMAL.
When the EMER BUSswitch is in theNORMAL position, the emergency
bus system relays will be deenergized and equipment on the emergency
buses will be powered from the normal electrical system . DC
equipment on the emergency buses will be powered through the associated
DC BUS 1. AC equipment on the emergency bus will be powered
through the LAC bus and R 26 VAC bus. When the switch is in the
EMER BUS position, the battery relays will be deenergized, the emergency
bus system relays will be energized, and equipment on the emergency
buses will be powered through the emergency bus system . When
the battery relays are deenergized, the aircraft batteries are completely
isolated from the battery charging bus and the normal DC power distribution
system . When EMER BUS is selected electrical power will be
distributed as follows:
1. DC power for the primary pitch trim motor will be switched
from the battery charging bus to the LH (#1) aircraft battery.
2. DC power for the auxiliary hydraulic pump will be switched
from the battery charging bus to the RH (#2) aircraft battery.
3. DC powered equipment on the emergency buses will be
switched from the associated DC BUS 1 to the aircraft batteries.
4. The LH Inverter is on theDC EMER BUS and provides 115 VAC
to the AC EMER BUS. On aircraft 31-035 thru 31-060,31-062 thru
31-065, 115 VAC is supplied to the LH 26 VAC transformer and
26 VAC output from the transformer will be applied to the
appropriate circuit breakers. On aircraft 31-061, 31-066 & subsequent,
26 VAC output from the LH inverter is applied to the
appropriate circuit breakers.
5. The DC voltmeter will display the voltage of both batteries (EM
BUSTIE must be closed).
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