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Learjet 31A
Pilot's Manual
NOTE: Pilot's seat shown. On copilot's
seat, seat height, recline
control and track lock are on
opposite side .
CREW SEATS
Figure 1-12
ta.ss. AAM
PM-121
1-19
Change 4
Learjet 31A
Pilot's Manual
TABLE OF CONTENTS
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HYDRAULICS &
LANDING GEAR
Hydraulic System . .. .................. .. ......................... ................... .. .. .. ...... .. ....3-1
HYD PUMP Switch................................. .. .. ...... ............. .... .. .. .. .......... .. ..3-2
LO HYD PRESS Light ............................................. .......... ............ .... .. .. 3-2
Hydraulic Pressure Indicator ........ .. .... ....................... .................. ...... ..3-2
Hydraulic System Schematic (Figure 3-1) .............. .. .. .... .................... 3-3
Emergency Air System ............................ ............. .................................... 3-4
Emergency Air Pressure Indicator........................... ............................ 3-4
Landing Gear System ................................................ .. .......... .................... 3-4
Landing Gear Extension/Retraction Schematic (Figure 3-2) .. ........3-5
Landing Gear Selector Switch ................ .. ....................... .. .................. 3-6
Landing Gear Position Lights . ............... ............................. .. .......... .... 3-7
Landing Gear Warning System ............................................ .. ...... ...... ..3-8
Landing Gear Alternate Extension ............. ..................... .. .. ........ ........3-8
Nose Wheel Steering System
Analog ............ .. ...... ...................................... ................... .... .................... 3-9
STEER ON Light ........ .. ....................... ................. .... ...... ............ ...... 3-10
STEER LOCK Switch ....... ................. ...................................... ........ 3-10
Control Wheel Master Switch-Nose Steering Function . ...... . 3-10
Digital ................ ............................. .............................................. .. ...... 3-10
STEERON Light.... .......... .......................................................... ....... 3-11
ARM/NOSE STEERSwitch ...................................... ..................... 3-11
Control Wheel Master Switch-Nose Steering Function ........ 3-12
Wheel Brake System ..................................... ........... ...... ......... ............ .. .. 3-12
Parking Brake ................................... ........................... ........... ...... .... .. . 3-12
Emergency Braking .......................................................... .. .. .. ...... .. ....3-13
Wheel Brake System Schematic (Figure 3-3)........... ....... .. .. .. .. .. .. .. .. .. 3-14
Anti-Skid System ...................... .. ................. ......................... .......... .. ......3-15
ANTI-SKID Lights ...... ...... .... .. ............... .. ...... ......... .... ...... .. ........ .. ......3-15
ANTI-SKID Switch . .. .... ........ .. ...... ......... .. ...... .. ....... .. .. .... .............. ...... 3-16
Learjet 31A
Pilot's Manual
HYDRAULIC SYSTEM
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HYDRAULICS &
LANDING GEAR
The aircraft hydraulic system supplies hydraulic pressure for operation
of the aircraft landing gear, brake, flap, spoiler, and thrust reverser systems.
Hydraulic fluid is supplied from the hydraulic reservoir through
shutoff valves to the engine-driven hydraulic pumps for distribution to
the required systems upon demand. The engine-driven, variable-volume
hydraulic pumps will normally maintain system pressure between
1500 and 1550 psi (10,343 and 10,687 kPa).Apressure relief valve
installed between the high-pressure and return lines will open to relieve
pressure in excess of 1700 psi (11,722 kPa). Reservoir pressure is
maintained at approximately 20 psi (138 kPa) by bleed air supplied
through a pressure regulator. Reservoir pressure in excess of 20 psi (138
kPa) is relieved overboard by a pressure relief valve. Aprecharged (850
psi [5861 kPal) hydraulic accumulator is installed to dampen and absorb
pressure surges . One high-pressure filter and one return filter prevent
　
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