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the averaging circuit of the thermocouples is applied to the Turbine
Temperature (ITT) indicator and the digital electronic engine control.
An OFF flag on the indicator will be in view whenever electrical power
is not available to the instrument. Electrical power for the indicators
is 28 VDC supplied through the 2-amp Land R ITT circuit breakers
on the pilot's and copilot's circuit breaker panels respectively. The
ITT indicators are operative during EMER BUS mode. Refer to Airplane
Flight Manual for instrument limit markings.
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PM-121
Change l
Learjet 31A
Pilot's Manual
ENGINE FIRE DETECTION SYSTEM
Three heat-sensing elements connected in series are located in each engine
nacelle to detect an engine fire. One element is located around the
accessory gearbox; one is located around the engine tailcone; and another
around the engine firewall. The fire detection system is controlled
by two fire detect control boxes located in the tailcone. In the event of
an engine fire, the applicable control box will sense a resistance change
in the sensing elements and flash the applicable ENG FIRE PULL Thandle
warning light. Warning is given if the firewall or accessory gearbox
area exceeds approximately 410°F (210°C) or the engine tailcone
area exceeds approximately 890°F (476°C). Electrical power for the system
is 28 VDC supplied through the 7.5-amp Land R FIRE DET circuit
breakers on the pilot's and copilot's circuit breaker panels respectively.
Fire detect systems are operative during EMER BUSmode.
SYSTEM TEST SWITCH-FIRE DETECTION FUNCTION
The rotary-type system test switch on the pilot's instrument panel is
used to test the fire detection system . Rotating the switch to FIRE DET
and depressing the switch PRESS TESTbutton will connect a resistance
into both fire detect system circuits. This resistance, simulating an engine
fire, will cause both ENG FIRE PULL Thandle warning lights to
illuminate and flash.
ENG FIRE PULL LIGHT
A red ENG FIRE PULL warning light is installed in each Thandle on
the glareshield to warn the crew of a fire in the associated engine nacelle.
In the event of an engine fire, the associated ENGFIRE PULL light
will illuminate and flash. Operation of the Thandle is explained under
ENGINE FIRE EXTINGUISHING SYSTEM.
ENGINE FIRE EXTINGUISHING SYSTEM
The engine fire extinguishing system components include: two spherical
extinguishing agent containers, an ENG FIRE PULL Thandle for
each engine, two amber ENG EXT ARMED light/switches, one hydraulic
shutoff valve for each engine, one fuel shutoff valve for each engine,
a thermal discharge indicator, a manual discharge indicator, and
associated wiring and plumbing. The system also utilizes the pneumatic
system bleed-air shutoff valves . The system is plumbed to provide
the contents of either or both extinguishing agent containers to either
engine nacelle. Two-way check valves are installed to prevent extin-
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Change 3
Pilot's Manual
Learjet 31A
guishing agent flow between containers . The extinguishing agent, Ha-
Ion 1301 (bromotrifluoromethane [CF3Br]), is stored under pressure in
the extinguisher containers and a pressure gage on each container is
visible from inside the tailcone. Halon 1301 is non-toxic at normal temperatures
and is non-corrosive. As Halon 1301 is non-corrosive, no special
cleaning of the engine or nacelle area is required in the event the
system has been used. The system operates on 28 VDC supplied
through the 7.5-amp L and R FIRE EXT circuit breakers on the pilot's
and copilot's circuit breaker panels respectively. Fire extinguishing systems
are operative during EMER BUS mode.
ENG FIRE PULL T-HANDLE AND ENG EXT ARMED LIGHTS
The engine fire extinguishing system is operated through the ENG
FIRE PULL T-handles and the ENG EXT ARMED lights on the
glareshield outboard of the Thandles. TheENG EXTARMEDlights are
combination light/switches. When an ENG FIRE PULL T-handle is
pulled, the associated engine fuel, hydraulic, and bleed-air shutoff
valves will close to isolate the affected engine and the ENG EXT
ARMED lights will illuminate. Illumination of the ENG EXTARMED
lights indicates that the fire extinguishing system is armed. Depressing
an illuminated ENG EXT ARMED light will discharge the contents of
one extinguisher bottle into the associated nacelle. Depressing the other
ENG EXT ARMED light will discharge the contents of the remaining
bottle . Either or both ENG EXTARMED lights maybe depressed to extinguish
the fire. Should one container control the fire, the other container
is available to either engine .
　
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