LearJet Training Resources    |   Part 135 Training Resources

1. WING TEMP and STAB TEMP gauges indicate leading edge skin temperature and are color coded.
A.RED=Overheat. Leading edge skin temperature too hot.
B.YELLOW=Warning. Skin temperature may be too low to prevent icing
C.YELLOW=Master Caution. Check QRH for remedy. Will not trigger a Master Warning.
D.RED=Temperature below 35 degrees F (danger of icing in visible moisture)


2. When either WING OV HT or STAB OV HT light comes on, and the system is turned off, the light will remain on until the temperature drops to within limits.
A.The STAB WING HEAT switch may be turned back on, but the pilot must visually monitor the applicable skin temperature indicator and cycle the system on and off to maintain temp in the green arc.
B.The STAB WING HEAT switch may be turned back on, but the pilot must visually monitor the applicable skin temperature indicator and cycle the system on and off to maintain temp in the red arc.
C.The STAB WING HEAT switch may be turned back on.
D.The STAB WING HEAT switch must not be turned back on, until the light starts blinking.


3. Stabilizer heat and wing heat are not available
A.when one emergency pressurization valve switch is in emergency
B.when both emergency pressurization valve switched are in normal
C.when both emergency pressurization valve switches are in emergency
D.when either engine is not operating


4. The crew action required when the red WING OV HT light illuminates is
A.No action is required the system is automatic
B.Turn the STAB WING HEAT to OFF or reduce power
C.Position the STAB WING HEAT switch to STAB
D.Turn one BLEED AIR switch to OFF until the light goes out


5. If anti-ice systems are required during takeoff,
A.they should be turned on immediately after starting engines. No changes are needed to adjust performance data because engine power is automatically compensated for by the P2 T2 sensors
B.they should be turned off prior to setting takeoff power, then must be turned back on after the stick pusher activates.
C.they should be turned on prior to setting takeoff power.
D.they should be turned on prior to setting takeoff power. Appropriate takeoff power and performance charts must be used.


6. Icing conditions exist when there is visible moisture and the indicated ram-air temperature (RAT) is
A.+10 degrees C or below
B.+10 degrees F or below
C.+5 degrees C or below
D.+5 degrees F or below


7. When using the wing and stabilizer anti-ice systems during descent,
A.no changes to engine speed is required because the system automatically compensates for the additional bleed air use.
B.the cabin altitude may decrease unless the emergency pressurization switches are set to Emergency to compensate for the additional bleed air use.
C.the air cycle machine maintains engine RPM through the constant speed drive, to compensate for the additional bleed air use.
D.the cabin altitude may increase unless sufficient engine RPM is maintained to compensate for the additional bleed air use.


8. The Lear 25 utilizes electrical heating elements along it's horizontal stabilizer.
A.A fluxuating reading on the ammeter indicates an electrical problem. During flight if the electrical heating elements should fail, the STAB HEAT light will come on.
B.A fluxuating reading on the ammeter indicates proper operation. During flight if the electrical heating elements should fail, proper operation. During flight if the electrical heating elements should fail, the STAB HEAT light will come on.
C.A steady reading on the ammeter indicates proper operation. During flight if the electrical heating elements should fail, the STAB HEAT light will come on.
D.During flight if the electrical heating elements should fail, the STAB HEAT light will blink on and off.


9. In the Lear 25, when the NAC HEAT switches are turned on, the most probable cause for both ENG ICE lights illuminating is:
A.A DC power failure
B.A short circuit to the front frame anti-ice valve
C.Less than 5psi in the front frame manifolds
D.Excessive temperature in the front frame manifold


10. When using wing anti-ice in the Lear 25, monitor the wing temperature gauge and the WING OV HT light. If the wing temperature gauge is in the yellow arc,
A.the wing structure is approaching a "too hot" condition. Corrective action can be taken by reducing RPM, however power should not be retarded below 80% RPM to retain effective wing and engine anti-ice.
B.the wing structure is in the correct temperature range, however power should not be retarded below 80% RPM to retain effective wing and engine anti-ice.
C.the wing structure is too hot. Corrective action can be taken by reducing RPM
D.Corrective action can be taken by reducing RPM, however power should not be retarded below 80% RPM to retain effective wing and engine anti-ice.



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