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6-12
PM-121
Original
Learjet 31A
Pilot's Manual
PITOT-STATIC AND STALL WARNING ANTI-ICE
Anti-ice protection for the pitot-static probes, total temperature probe,
and stall warning vanes, is accomplished by energizing integral electrical
heating elements in each component. The independent pitotstatic
probe, total temperature probe, and stall warning vane anti-ice
systems consist of control switches, probe heaters, wane heaters, and
pitot heat monitors. Both left and right systems utilize the same PITOTHT
light. The pitot-static probe heating elements receive 28 VDC
through the respective 15-amp L and RPTTOTHT circuit breakers on
the pilot's and copilot's circuit breaker panels .Mot heat system is operative
during EMER BUS mode. The total temperature probe heating
element receives 28 VDCthrough the 15-amp TATPROBE HT circuit
breaker on the pilot's circuit breaker panel. The stall warning vane
heating elements receive 28 VDC through the respective 10-amp L
and R STALL VANE HT circuit breakers on the pilot's and copilot's
circuit breaker panels.
PITOT HEAT SWITCHES
The pitot-static heat systems are individually controlled through the
MOT HEAT switches in the ANTI-ICE group on the center switch
panel. Each switch has two positions: On (L or R) and OFF. When the
Land RMOTHEAT switches are set to On (L and R), power is supplied
to each pitot-static probe heater, each stall warning vane heater,
and the total temperature probe heater.
PITOT HT LIGHT
A dual pitot heat monitor system is installed to alert the pilot if insufficient
current is being applied to the pitot-static probe heating elements.
The monitors are wired to the ground side of the pitot-static
probe heating elements. Each monitoris basically a relay which maintains
an open circuit for the PITOT HT light as long as sufficient current
is being applied to the associated pitot-static probe heating element.
In the event of a malfunction in or loss of power to the
associated pitot-static probe heating element, the relay will release
and complete the PITOT HT light circuit. Illumination of the amber
PI TOTHT light, in the glareshield annunciator panel, indicates a malfunction
in either the left or right pitot-static heat system or that at
least onePITOTHEAT switch is OFF.
PM-121
6- 13
Change l
Pilot's Manual
Learjet 31A
OXYGEN SYSTEM
The aircraft oxygen system provides oxygen service for the crew and
passengers. The system consists of the crew and passenger distribution
systems, a high-pressure oxygen storage cylinder, a shutoff valve and
pressure regulator assembly, an oxygen pressure gage, an overboard
discharge relief valve and indicator, an oxygen aneroid switch, a passenger
oxygen control valve, lanyard actuated passenger mask oxygen
valves, and crew and passenger oxygen masks. Electrical power to operate
the passenger oxygen control valve is supplied through the 7.5-
amp OXY VALVE circuit breaker on the pilot's circuit breaker panel.
Oxygen is available to the crew at all times and can be made available
to the passengers either automatically above 14,000 (±750) feet cabin altitude,
or manually at any altitude through the use of the cockpit controls
on the pilot's sidewall. The oxygen system is designed for use
during emergency descent to a cabin altitude not requiring oxygen and
is not tobe used for extended periods of flight at cabin altitudes requiringoxygen
or as a substitute for the normal pressurization system. Passenger
masks will not provide sufficient oxygen for prolonged
operation above 34,000 feet cabin altitude. Prolonged operation above
25,000 feet cabin altitude with passengers on board is not recommended.
Smoking is prohibited when oxygen is in use. Refer to the FAAApproved
Airplane Flight Manual for limitations and operating
procedures.
OXYGEN STORAGE AND PRESSURE REGULATOR
The oxygen storage cylinder has a storage capacity of40 cubic feet (1.13
cubic meters) at 1800 psi (12,411 kPa). The cylinder is located in the dorsal
fin or the right side of the nose compartment. The shutoff and pressure
regulator assembly forms an integral part of the storage cylinder
and provides for pressure regulation, pressure indication, and servicing.
Oxygen pressure is available to the passenger and crew distribution
systems and is regulated to a pressure of 60 to 80 psi (418 to 552
kPa) when the oxygen cylinder shutoff valve is open. The shutoff and
pressure regulator assembly also incorporates a burst disc pressure relief
valve to discharge the oxygen cylinder contents overboard in the
　
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