BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual page 232

N1 ITT
°C
%RPM
100 1000
970
98.6
96.2 928
90 900
860
800
60
700
600
500
30
400
300
200
0
0
L R L R
DGT
OFF
Figure 7-11. Engine Instruments
for example, the left analog scale and the right
digital scale have the same power source. A
separate power source is used for the right
analog and left digital scale. This ensures that
a single power failure will not result in total
readout loss on any engine instrument.
The analog scales are made up of separate
colored segments. These segments are pro-
gressively illuminated from groups of bulbs
with the instrument. The light is transmitted
to the scale segments by fiber optics. The col-
ored segments provide for safe (green), cau-
tion (yellow), and warning (red) indications.
The bottom segment in each vertical scale is
power indicator that will show blue if power
is available to the scale.
Power Sources
The engine instruments are powered from a
signal data converter (SDC). The SDC is sup-
plied DC power from the battery bus and the
essential DC bus. The SDC processes the in-
puts from the various engine parameters and
produces two outputs. These outputs are sup-
plied to the instrument lamp banks. Fiber op-
tics transmit the light from the lamp banks to
the colored segments of the vertical scales.
The digital displays are converted from the as-
sociated analog displays. When compared
with the nonlinear analog readout, the digital
indicators provide a more accurate indication.
N2 FUEL
%RPM FLOW
104 4000
3500
99.4 3000
99.2
98.2
2000
80
1000
P
800
P
60
H
600
40
400
20
200
0
0
L R L R
x10
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
CL-600-2B16 PILOT TRAINING MANUAL
Automatic Dimming
A photoelectric cell (Figure 7-12) is provided
on the engine instrument control panel to pro-
vide for automatic engine instrument dim-
ming as ambient light conditions change. A
rheostat on the same panel allows the crew to
set brilliancy to personal preferences.
Instrument Testing
The power supplies of the SDCs are tested
with a three-position TEST switch (Figure 7-
12). Selecting the switch to position 1 or 2 tests
the corresponding SDC power supply by il-
luminating all analog and digital displays in-
cluding the fuel panel.
Indications
The amber light above the instrument test
switch (Figure 7-12) will illuminate when a
power input source to the SDC fails. In this
case, the blue power-on segments of the af-
fected scales will extinguish, and the associ-
ated analog and opposite digital display will
be lost.
Figure 7-12. Engine Instrument
Lt é e
Lt d.
AUX PWR
1 2
TEST
D
I
M
Control Panel
CL 601-3R 7-15