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to maintain a constant 125°F (52°C) to 150°F (66°C) airflow temperature.
The system utilizes the cabinblower to provide heated air circulation.
To ensure airflow over the heating elements the cabin blower is
activated whenever AUX HT switch is set to CAB & CREW. Cabin
blower speed is limited to 10%maximum until air temperature reaches
150°F (66°C), at which timecabin blower speed automatically increases
to maximum. Cabinheater control circuits are wired through start and
coolingsystem cutout relays; therefore, the cabin auxiliary heating system
is inoperable during engine start and during cooling system operation.
The system control circuits operate on 28 VDCsupplied through
the 7.5-amp AUX CAB HT circuit breaker on the pilot's circuit breaker
panel. The heater elements are powered by 28 VDC supplied through
two 50-amp current limiters wired to asingle 150-amp current limiter
on the battery charging bus.
The cabin auxiliary heat maybe used to heat the cabin before starting
the enginesprovided power is supplied by a GPU. When using the system
in this fashion, ensure the CAB AIRswitch is set to OFF.This will
preclude the possibility of operating the cockpit inline heater when no
air circulation is available.
" Aircraft 31-175 &subsequent
Each heater coil assembly consists of two heater coils, two thermoswitches
and a thermal sensor. The heater coil assemblies are provided
overheat protection by the thermoswitches which are wired into
the control circuit for the heater coil assemblies . Should any coil element
become overheated, the foward thermoswitch will open at 350°F
(177°C) and power will be disconnected from both coil assemblies . The
aft thermoswitch cycles the heating elements to maintain a constant
125°F (52°C) to 150°F (66°C) airflow temperature. The system utilizes
the cabinblower (31-175 thru 31-190), or flood fanblower (31-191 &subsequent),
to provide heated air circulation. To ensure airflow over the
heating elements, the cabinblower/flood fanblower is activated whenever
AUX HT switch is set to CAB & CREW When air temperature
reaches 150°F (66°C), the cabin blower/flood fan blower speed automatically
increases to maximum. Cabin heater control circuits are
wired through start and cooling system cutout relays; therefore, the
cabin auxiliary heating system is inoperable during engine start and
PM-121
6-41
Change 4
Pilot's Manual
Learjet 31A
during cooling system operation. The system control circuits operate
on 28 VDCsupplied through the 7.5-amp AUXCABHT circuit breaker
on the pilot's circuit breaker panel. The heater elements are powered by
28 VDCsupplied through two 50-amp current limiters wired to a single
150-amp current limiter on the battery charging bus.
The cabin auxiliary heat may be used to heat the cabin before starting
the engines provided power is supplied by aGPU. When using the system
in this fashion, ensure the CABAIRswitch is set to OFFThis will
preclude the possibility of operating the cockpit inline heater when no
air circulation is available.
AUX HT SiN1TCH
The auxiliary heating system is controlled through theAUX HT switch
on the copilot's switch panel. The switch has three positions: OFF,
CREW and CAB Ez CREW. When the switch is in the CREW position,
the cockpit inline heater will energize if all the prerequisite conditions
are met. With the switch in theCAB ds CREW position, the cockpit heater
will operate as described, and the cabin heating elements will energize
to provide cockpit and cabin heat.
Learjet 31A
Pilot's Manual
~-ZCY9O9 ti~ Ii
DOORS, EXITS &
MISCELLANEOUS EQUIPMENT
TABLE OF CONTENTS,
Cabin Entry Door ................... ..................................... ............. .... ............7-1
DOOR Warning Light .................................................... ....................... 7-1
Cabin Door Operation ........ ..................................... ............................. 7-2
Door Hook Actuator Switch ..... ............................... ......................... .. .. 7-3
Manual Door Hook Release ..... ............................... ....................... .. .. .. 7-3
Emergency Exits . ..................... .... ................................. ...... .. ............... .. .... 7-3
External Doors ......................... .................................................................. 7-4
Emergency Equipment .............. ............................. ......................... ........7-4
Hand Fire Extinguisher ................................ ........ .................................7-4
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