Pilot’s Manual Learjet 60
4-32 PM-123
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EMERGENCY LIGHTING SYSTEM (OPTIONAL)
The emergency exit lighting system provides cabin and exit lighting in
the event of a normal electrical system failure. The system consists of
two emergency battery units, two egress light assemblies (one for each
exit), an EMERGENCY EXIT LIGHTS control panel, and associated air-
craft wiring. The passenger reading lights and aisle lights are utilized
to provide cabin lighting for emergency egress. The batteries are
charged through the 5-amp EMER LTS circuit breaker on the copilot’s
circuit breaker panel. If armed, the system will automatically activate
whenever R DC BUS 4 loses normal electrical power. Therefore, the sys-
tem will automatically activate during EMER BUS mode.
EXIT SIGNS
The aircraft is equipped with emergency exit signs that are self illumi-
nating to show passengers the location of aircraft exits. There is no elec-
trical wiring associated with this type of placard. They use radioactive
material to produce the lighting. Also, there is an optional all DC pow-
ered exit signs which could be installed.
EMERGENCY BATTERY UNITS
The battery units, used in the emergency exit lighting system, are re-
chargeable, 24-volt, and maintenance-free. Each battery unit incorpo-
rates a relay that when activated will connect the battery to the lights
utilized for emergency exit lighting. The relay will remain latched in
this position until a signal to reset is received. Therefore, once activated
the emergency exit lighting system will remain activated even though
control wiring may become severed. One battery is located in the for-
ward part of the cabin while the other is located in the aft part of the
cabin. Either battery is capable of powering the entire emergency exit
lighting system by itself, thus allowing emergency lighting to activate
even with a vertical transverse separation of the cabin.
EGRESS LIGHT ASSEMBLIES
An egress light assembly is installed in the upper cabin door and the
emergency escape/baggage door. When activated, these lights provide
illumination of the emergency exits. Each light assembly includes a mo-
mentary push button switch. If the system is armed but not activated,
pressing either push button switch will manually activate the system.
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