BLEED-AIR SYSTEM
COMPONENTS
BLEED SWITCHES
The L and R BLEED switch/indicators (Figure
9-1) are used for independent control of left
and right engine bleed-air supply. Each S/I is
a momentary action switch that illuminates
“OFF” when not selected, and is blank when
depressed/selected to the ON position. See
Table 9-1 for a summary of the valves affected
by the BLEED switches.
ECS CONTROLLER
The ECS Controller is installed in the tail-
cone and contains the circuitry required to
operate the ECS SOVs, the HP SOVs and the
Emergency Pressurization valves (Figure 9-3).
The ECS Controller is dual channel, control-
ling bleed-air supply from both the right and
left engines independently. The left channel
controls the left ECS PRSOV, left HP SOV
and the left Emergency Pressurization Valve;
the right channel controls the same valves on
the right side. The controller channels receive
independent inputs from pressure sensors in
the HP ducts, the Cabin Pressurization
Controller, Thrust Lever angle, BLEED switch
position and EMER PRESS switch position.
The left and right channels of the controller
receive 28 VDC from the left and right es-
sential busses respectively through the L
BLEED and R BLEED circuit breakers. The
circuit breakers can be found in the ENVI-
RONMENTAL group of circuit breakers on the
respective circuit breaker panels. The circuit
breakers provide power through the ECS con-
9-3
FOR TRAINING PURPOSES ONLY
LEARJET 45 PILOT TRAINING MANUAL
FlightSafety
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