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Both EADI’s, both EHSI’s and the standby attitude gyro must be operational
for takeoff.
A minimum of two symbol generators must be operational for takeoff.
The pilot’s and copilot’s displays must be sourced by separate symbol
generators.
On the copilot’s side, the reversionary EADI down mode may only be
used in conjunction with the composite (CMPST) mode.
ENGINE SYNCHRONIZER
Engine sync must be OFF for takeoff, landing, and single-engine operation.
EXTERNAL POWER
The maximum amperage from an external power source must be limited
to 1000 amps.
COOLING SYSTEM
Do not switch the cooling system ON or OFF during takeoff or landing.
On aircraft 31-035 thru 31-190, the cooling system must be OFF above
FL350.
Change 21
Learjet 31A AFM Limitations
FM-121 1-15
FAA Approved 7-25-91
Change 5
SYSTEM LIMITS (Cont)
GENERATOR LIMITS
Generator output is limited as follows:
• 325 amps maximum for any altitude and Turbine Speed (N2)
except as noted below.
• 400 amps for:
° S. L. — 25,000 Ft for Turbine Speed (N2) of 80% or above.
° 25,000 Ft — 41,000 Ft for Turbine Speed (N2) of 86% or above.
° 41,000 Ft — 51,000 Ft for Turbine Speed (N2) of 93% or above.
For single generator operation on the ground, the generator
output is limited to approximately 220 amps to protect
the 275-amp current limiters. If more electrical load
is applied, the current will be drawn from the aircraft
batteries and will not be shown on the DC AMPS display.
If this occurs, DC voltage will be reduced. A DC
voltage of 26 volts or less indicates a heavy drain on the
aircraft batteries.
HYDRAULIC SYSTEM
Do not exceed auxiliary hydraulic pump duty cycle of 3 minutes ON,
then 20 minutes OFF.
Only hydraulic fluid conforming to MIL-H-5606 is approved.
NOSE WHEEL STEERING
Aircraft 31-035 thru 31-054 not incorporating SB 31-32-2
Maximum Ground Speed............................................................... 45 knots
Maximum Ground Speed with any two of the following
three ANTI-SKID lights illuminated: Left and right
inboard and right outboard ......................................................... 10 knots
NOTE
Change 5
Limitations Learjet 31A AFM
1-16 FM-121
FAA Approved 7-25-91
Change 16
SYSTEM LIMITS (Cont)
OXYGEN SYSTEM
The following aircraft certification requirements are in addition to the
requirements of applicable operating rules. The most restrictive requirements
(certification or operating) must be observed.
Above Flight Level 250, crew masks must be in the quick-donning position
which allows donning within 5 seconds.
On aircraft with inflatable harness crew masks, hats and “ear-muff” type
headsets must be removed prior to donning crew oxygen masks.
Headsets and eyeglasses worn by crew members
may interfere with quick-donning capabilities.
Crew and passenger oxygen masks are not approved for use above
40,000 feet cabin altitude.
• Passenger masks are intended for use during an
emergency descent to an altitude not requiring
supplemental oxygen.
• 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.
RUDDER BOOST SYSTEM
If rudder boost is to be used, the BEFORE STARTING ENGINES rudder
boost check must be accomplished in accordance with Section II of this
manual.
SINGLE-POINT REFUEL SYSTEM (IF INSTALLED)
Use of single-point refuel system is limited to aircraft equipped with
fuel heaters.
SPOILERS
Do not extend spoilers with flaps extended while airborne.
If the spoilers are inoperative in flight, the maximum operating altitude
is limited to 41,000 feet.
NOTE
WARNING
Change 16
Learjet 31A AFM Limitations
FM-121 1-17
FAA Approved 7-25-91
Change 12
SYSTEM LIMITS (Cont)
STALL WARNING SYSTEM
To assure proper stall warning system operation, the BEFORE STARTING
ENGINES stall warning system operation checks in Section II of
this manual must be completed on each flight.
The angle-of-attack indicators may be used as a reference but do not replace
the airspeed indicators as primary instruments.
THRUST REVERSERS (IF INSTALLED)
When thrust reversers are installed, refer to the applicable Thrust Reverser
Supplement for limitations, normal procedures, emergency procedures,
abnormal procedures, and performance data.
TIRES
Main Tire Limiting Speed (Ground Speed) .............................. 182 knots
　
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