4H-8 Developed for Training Purposes Leerjet 35/36
February 1998
CAE SimuFlite
Engine Anti-Ice
With the NAC HEAT switches in the OFF position, 28V DC
fromthe Left and Right Main buses powers the normally open
engine anti-ice solenoid valves closed. Placing the switches in
the ON position de-energizes valves to the open position.
Hot bleed air flows through the open valves and enters the
nacelle inlet diffuser tubes. After warming the inlet, bleed air
exhausts overboard. A pressure switch in each engine bleed
air supply line closes when bleed air pressure reaches 2 PSI
and turns off the ENG ICE annunciators.
Placing the NAC HEAT switches in the on position also sup-
plies 28V DC from the Left and Right Main buses to the engine
P
t 2/ Tt 2 probes.
Pitot/Static Anti-Ice
With the BAT switches in the on position, 28V DC from the Left
and Right Essential buses powers the static port heating ele-
ments.
Placing the PITOT HEAT switches in the on position supplies
28V DC from the Left and Right Essential buses to the pitot
tube and stall warning vane heating elements and total temper-
ature probe (if installed). The PITOT HT annunciator(s) illumi-
nate if:
Q
one or both PITOT HEAT switches are in the OFF posi-
tion
Q
one or both pitot heat systems fail
Q
either pitot heat system fails (dual annunciator configura-
tion).
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