Learjet 60 Pilot’s Manual
PM-123 4-19
Change 6
EMERGENCY POWER SYSTEM
The aircraft is equipped with either a single, dual or triple emergency
power system to supply electrical power to selected equipment in the
event of a normal electrical power system failure. Operating time of
equipment powered by the emergency power supply is presented in
the Airplane Flight Manual. Power for the emergency power system is
supplied by two emergency power supply units located in the right, aft,
nose avionics compartment. Each emergency power supply unit con-
tains a 12-cell lead-acid battery to provide electrical power. The emer-
gency power supply batteries are trickle charged from the aircraft
normal electrical system through the 15-amp EMER BAT circuit break-
ers on the pilot’s and copilot’s circuit breaker panels.
If the normal electrical system has failed, and only one emergency
backup is installed, EMER BAT 1 power supply will provide electrical
power for the standby attitude indicator, N
1 indicators, selected instru-
ment lights (standby attitude indicator, N
1 indicators, standby airspeed
indicator, standby altimeter, and magnetic compass), gear position
lights, NAV 1 and RTU 1; If a second emergency backup battery is in-
stalled, EMER BAT 2 will supply electrical power for gear position
lights, NAV 1, RTU 1 and backup power for the Attitude Heading Ref-
erence System (AHS 1 & 2), air data computers (ADC 1 & 2); If a third
emergency backup battery is installed, EMER BAT 3 will supply emer-
gency power to FMS 1 and VHF COMM. Additionally, this will allow
programming of FMS 1 on the ground when a GPU or APU is not avail-
able. The system is controlled through the EMER BAT 1, EMER BAT 2,
and EMER BAT 3 switches on the pilot’s switch panel. Amber EMR
PWR 1, EMR PWR 2 and EMR PWR 3 annunciators on the center in-
strument panel will illuminate whenever electrical power from the as-
sociated emergency power supply is being used.
On aircraft 60-001 thru 60-248, standby power for N
1 indicators are
powered by EMER BAT 1.
On aircraft 60-249 and On, standby power for N
1 indicators are powered
by EMER BAT 2.
Change 6
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