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panel. Whenever the switch is set to BCN or BCN/STROB, the anti-collision
(beacon) lights will operate. Each light has its ownself-contained
power source . The lights operate on 28 VDC supplied through the 7.5-
ampBCNLTS circuit breaker on the copilot's circuit breaker panel.
Pilot's Manual
Learjet 31A
On aircraft 31-174 and subsequent, a solid-state, red lens, single-bulb,
anti-collision light is mounted on top of the vertical stabilizer. On the
bottom of the fuselage is a dual-purpose anti-collision light that incorporates
two flashtubes-one with an aviation red lens and one with a
clear lens. The anti-collision lights are controlled through the BCN/
STROBE light switch in the LIGHTS group on the center switch panel.
When the switch is placed in the BCN/STROBE position, the red lens
beacon light on the bottom fuselage and the red lens beacon light on the
vertical stabilizer will flash if the aircraft's weight is on the wheels.
When the aircraft's weight is off the wheels, only the upper beacon will
flash. When the switch is placed in theBCN position, the red lens beacon
light on the bottom fuselage will flash whether or not the aircraft's
weight is on the wheels. On aircraft incorporating SB 31-33-12, Modifecation
of Strobe Light Switch, when the BCN/STROBE switch is in the
STROBE position the upper beacon will operate regardless of weight
on wheels. When the BCN/STROBE switch is in theBCN position, both
beacons will flash_ The beacon light on the top of the vertical stabilizer
will flash in either switch position at a rate of45 to 55 flashesper minute
independent of the beacon/strobe light on the bottom fuselage, which
flashes at a rate of approximately 50 flashes per minute . The anti-collision
lights mounted on top of the vertical stabilizer and on the bottom
of the fuselage operate on 28 VDC supplied through the 7.5 amp BCN
LTS circuit breaker on the copilot's circuit breaker panel.
STROBE LIGHTS
On aircraft 31-035 thru 31-173, strobe lights are installed on the outboard
side of each winglet and in the vertical stabilizer aft bullet. The strobe
system consists of lamps, a power supply unit for each light, and the
BCN/STROB light switch in the LIGHTS group on the center switch
panel. When the switch is set to BCN/STROB, all strobes will flash.
Each light will flash at a rate of approximately 50 pulses per minute.
Electrical power to the system is supplied through the 7.5-amp
STROBE US circuit breaker on the pilot's circuit breaker panel.
On aircraft 31-174 and subsequent, clear lens strobe lights are installed on
the vertical stabilizer aft bullet and as a component of the dual purpose
anti-collision light mounted on the bottom of the fuselage . The strobe
system consists of lamps, a power supply unit, and the BCN/STROBE
light switch in the LIGHTS group on the center switch panel. When the
BCN/STROBE light switch is set to BCN/STROBE, and the aircraft's
weight is not on the wheels, both strobe lights will flash. When the clear
lens strobe lights are not desired in flight, the switch must be set to BCN
or OFF On aircraft incorporating SB 31-33-12, Modification ofStrobe Light
Switch, when the BCN/STROBE light switch is set to STROBE, both
strobes will operate regardless of weight on wheels. When the clear
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PM-121
Change 4
Learjet 31A
Pilot's Manual
lens strobe lights arenot desired in flight, the switch mustbe set to BCN
or OFF The bottom fuselage strobe light and the vertical stabilizer aft
bullet strobe light operates on 28 VDC supplied through the 7.5 amp
STROBE ITS circuit breaker on the pilot's circuit breaker panel. Each
light will independently flash at a rate of approximately 50 pulses per
minute.
RECOGNITION LIGHT
Arecognition light is installed on the upper leading edge of the vertical
stabilizer. The light is controlled through theRECOGlight switch in the
LIGHTS group on the center switch panel. When the switch is placed
in the On (RECOG) position, control circuits apply full 28 VDCfrom the
battery charging bus to illuminate the light. For greatest lamp life, it is
recommended that the recognition light be turned OFF at altitudes of
18,000 feet or above. Electrical power for the recognition light is28 VDC
supplied through a 20-amp current limiter connected to the battery
chargingbus. The control circuits operate on 28 VDC supplied through
the 7.5-amp RECOG LT circuit breaker on the copilot's circuit breaker
panel.
Some aircraft are equipped with a pulsating recognition light option.
On these aircraft, the RECOG light switch has a middle position labelled
PULSE and a pulse controller unit. When the switch is placed in
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