Pilot’s Manual Learjet 60
7-38 PM-123
Change 6
The heater is part of the potable water tank and disconnects electrically
when the tank is removed from the cabinet. On some aircraft, the heater
turns on automatically when DC power is applied to the airplane and
the potable water tank is plugged into its power source. It automatical-
ly increases water temperature to 100°F (38°C). On other aircraft, the
heater is controlled by an ON/OFF switch located next to the AC outlet
on the lavatory wall. A 1-amp WATER HTR FAULT circuit breaker is in-
stalled in the cabinet below the sink.
The water heater receives 28 VDC through the 7.5-amp or 10-amp
WATER HEATER circuit breaker on the pilot’s circuit breaker panel.
The water pump receives 28 VDC power through the 7.5-amp LAV LTS
circuit breaker on the pilot’s circuit breaker panel. The lavatory lights
do not need to be on to operate the water pump.
The water pump on some aircraft must be turned on before water will
come from the faucet. The switch for the water pump is to the right of
the faucet on the lavatory wall. On other aircraft, the water faucet is an
on-demand type pump and will supply water when the faucet handle
is placed in the on position. Only warm water from the potable water
tank is available from the faucet. The water pump should be turned off
when not in use. On some aircraft, the pump is protected by a 3-amp
WATER PUMP circuit breaker installed in the cabinet below the sink.
A medicine cabinet is located behind the lavatory mirror. A make-up
mirror is located directly below the lavatory mirror. It is accessed by
pulling straight out from the underside of the center frame just above
the razor outlet. The makeup mirror can then be swiveled up and down
on a hinge to adjust to any desired angle.
The sink drain on some aircraft is mechanically operated. Lifting the
drain handle will drain the water from the sink. On other aircraft, the
sink is drained by pressing the DRAIN switch located in the vanity. A
green LED on the switch will illuminate when the switch is pressed.
The LED will extinguish when the switch is released. The water is
drained through a heated drain mast on the bottom of the aircraft. The
heater is activated through a squat switch and prevents ice from form-
ing on the drain mast. The drain mast heater receives 28 VDC through
the 5-amp TOILET circuit breaker on the pilot’s circuit breaker panel.
Change 6
To Next Page
Loading...
