Bleed-Air Valves (14Th Stage); Control And Indication; Operation (14Th Stage) - BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual

BLEED-AIR VALVES
(14TH STAGE)
Air from the single port at the 14th stage is used
for wing and cowl anti-icing and thrust re-
verser operation. Tapped off of the ducting
upstream of the shutoff valve is a line which
provides bleed air to the fuel heater whenever
the engine is running.
The 14th stage is controlled by two electrop-
neumatic valves called the left and right 14th-
s t a g e s h u t o f f v a l v e s . T h e s e v a l v e s a r e
considered one-way valves, as the operating
air pressure is obtained from only the up-
stream side of the valve. These valves are
spring-loaded open.

CONTROL AND INDICATION

The valves are controlled manually by the
14th stage bleed-air shutoff switchlights lo-
cated on the BLEED AIR control panel. The
switchlights have a split legend, with the upper
half having a white BLEED CLOSED legend
and the lower half a red DUCT FAIL legend.
The BLEED CLOSED light is a function of the
valve position, so it will illuminate whenever
the valve is closed. The power supplies for the
valves are DC bus 1 and DC bus 2, respectively.
PRESSURE
RELIEF
VALVE
LH COWL
ANTI-ICE
VALVE
9-8 CL 601-3A
PRESSURE
SWITCH
THRUST
T/R
REVERSER
LH 14TH STAGE
BLEED-AIR SOV
LH WING
ANTI-ICE
VALVE
LEFT WING
Figure 9-8. 14th Stage Bleed Air System
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
CL-600-2B16 PILOT TRAINING MANUAL
The valves are shut automatically whenever
the appropriate ENG FIRE PUSH switchlight
is activated, and the BLEED CLOSED light
will illuminate.

OPERATION (14TH STAGE)

Before starting the engine, the switchlights are
selected to the OFF position. Since the valves
are spring-loaded to the open position and there
is not air pressure to actuate the valve to the
closed position, it will be open and the BLEED
CLOSED light will be extinguished. As the
engine rpm increases during the start sequence,
air pressure from the 14th stage now repositions
the shutoff valve to the closed position and the
BLEED CLOSED light illuminates. If electri-
cal power to the solenoid were now lost, the
valve would revert to its spring-loaded position
which is open.
Pressing the switchlight in opens the valve, and
the BLEED CLOSED light extinguishes.
Pressing the switchlight again closes the valve,
and the BLEED CLOSED light illuminates.
Whenever the valve is open and the engine is
running, 14th-stage bleed air is available for
the wing and cowl anti-icing systems and for
the thrust reversers.
For a schematic refer to Figure 9-8.
PRESSURE
SWITCH
THRUST
REVERSER
RH 14TH STAGE
BLEED-AIR SOV
ANTI-ICE
RH WING
ISOL VALVE
ANTI-ICE
VALVE
RIGHT WING
PRESSURE
RELIEF
VALVE
RH COWL
T/R
ANTI-ICE
VALVE
L t é e
L t d .