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additional power for other systems is not used because 28 VDC from
the normal electrical system is balanced against it. In the event of a failure
of the normal electrical svstem, the balanced condition is removed
and electrical power from the emergency power supplies will illuminate
the EMR PWR annunciators, operate the Fan Speed (N1) indicators,
landing gear position lights, selected instrument lights (standby
attitude gyro, N1 indicators, standby airspeed indicator, standby altimeter,
standby HSI and magnetic compass), andAHS 1 &2.
EXTERIOR LIGHTING
LANDING/TAXI LIGHTS
Alanding/taxi light is installed on each main landing gear. The lights
are controlled by the LDG LT switches on the center switch panel. The
LDG LT switches have three positions: On (L and R), TAXI, and OFF
The landing light control circuits are wired through the main gear
down-and-locked switches; therefore, the landing lights are inoperative
when the landing gear is not down and locked. When the LDG IT
switches are placed in the On position, control circuits apply full 28
VDC to the landing lights and the lights will illuminate full bright.
When theLDGIT switches are in the TAXI position, resistors shunt the
lamp input power to 21 VDC and the lights are dimmed. In order to extend
the service life of the lamps, it is recommended that the lights be
used as sparingly as possible in the LDG IT mode. The lamps are supplied
electrical power through 20-amp current limiters. The control circuits
operate on 28 VDC supplied through the 7.5-amp Land R LDG -
TAXI LT circuit breakers on the pilot's and copilot's circuit breaker panels
respectively.
Some aircraft are equipped with a pulsating landing light option which
is used in conjunction with the pulsating recognition light. On these aircraft,
a pulse controller unit controls the landing lights by delivering
pulsating DC current at approximately 45 cycles per minute. The effect
of this pulsating current is to cause the bulb's brightness to continually
vary between approximately 40% and 100% of full bright. The pulsating
feature is activated when the RECOG light switch is set to the
PULSE position, the applicable LDG LT switch is OFFand. the landing
gear is down and locked. When the LDG LT switch is positioned to On
or TAXI, the landing/taxi fights will illuminate steadily.
4-22
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PM-121
Change 3
Learjet 31A
Pilot's Manual
NAVIGATION LIGHTS
Navigation lights are installed in the forward portion of the wing tips
and in the vertical stabilizer aft bullet . The lights are controlled through
theNAVswitch in the LIGHTS group on thecenter switch panel. When
theNAVlight switch is placed in theOn (NAV) position, thenavigation
lights will illuminate. Additionally, setting the NAV light switch to On
(NAV) automatically dims most instrument panel avionics annunciators
as well as the LANDING GEAR panel lights, EFIS CONTROLreversionary
mode lights, and most instrument panel and pedestal
.peanut" lights . Electrical power for the navigation lights is 28 VDC
supplied through the two 5-amp current limiters connected to the battery
charging bus. Electrical power for the control circuit is 28 VDC
supplied through the 5-amp NAVLTS circuit breaker on the pilot's circuit
breaker panel.
ANTI-COLUSION (BEACON) LIGHTS
AIRCRAFT WITH OSCILLATING BEACONS
On aircraft 31-035 thru 31-088 not incorporating SB 31-33-7 "Installation of
Solid-State Anti-Collision Light Assemblies", dualbulb anti-collision
lights are mounted on top of the vertical stabilizer and on thebottom of
the fuselage. The tandem mounted bulbs oscillate approximately 180°
at 45 cycles per minute. The beam is concentrated by an integral lens
that produces an illusionof90 flashes per minute due to the oscillating.
The fights are controlled through the BCN/STROB light switch in the
LIGHTS group on the center switch panel. Whenever the switch is set
to BCNor BCN/STROB, the anti-collision (beacon) lights will operate.
The fights operate on 28 VDC supplied through the 7.5-amp BCN LTS
circuit breaker on the copilot's circuit breaker panel.
AIRCRAFT WITH SOLID-STATE BEACONS
On aircraft 31-089 thru 31-173 and prior aircraft incorporating SB 31-33-7
"Installation of Solid-State Anti-Collision Light Assemblies", single-bulb,
solid-state, anti-collision fights are mounted on top of the vertical stabilizer
and on the bottom of the fuselage. The beacons on the bottom of
the fuselage and the top of the vertical tail flash alternately 45 to 55
flashes per minute per beacon. The fights are controlled through the
BCN/STROB light switch in the LIGHTS group on the center switch
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