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Pilot’s Manual
2-14 PM-132A
ENGINE START SYSTEM
A combined starter/generator is mounted on the front of the accessory
gearbox. For normal starts, the DEEC provides for automatic starting
which allows the thrust lever to be moved into the IDLE position before
activating the starter. When the respective L or R START switch is momentarily
depressed, the DEEC begins the start sequence by activating
the corresponding standby fuel pump and energizing the starter relay
closed. The starter relay connects electrical power to the starter from
the respective L or R GEN bus. Power to the GEN buses is supplied
from the aircraft batteries or an external power source.
An external power source is recommended for starts when ambient
temperature is 32° F (0° C) or below. Ensure an external power source
supply is regulated to 28-vdc, has adequate capacity for engine starting
and is limited to 1500 amps maximum. Allow the operating generator
amperage to decrease below 300 amps prior to a generator cross-start.
Refer to Cold Weather Operation, AFM, for additional information
when operating in extremely cold weather.
START SWITCHES
The L and R START switches, located in the respective ENGINE panel
of the pedestal, are guarded momentary action switches that illuminate
ON when depressed indicating the starter relay is energized.
START INDICATIONS
During engine starts, a vertical START green or amber EI will appear.
The green EI represents normal starter activity. The amber EI represents
an engine starter engaged with N2 greater than 51%.
Pilot’s Manual
PM-132A 2-15
ENGINE INDICATING (EI)
ENGINE VIBRATION MONITOR
The engine vibration monitor system consists of an accelerometer
mounted on each engine and a tailcone-mounted engine vibration
monitor signal conditioner. The vibration monitor signal conditioner
consists of two identical independent channels.
Each channel is powered by the corresponding 3-amp L or R VIB MON
circuit breaker located within the ENGINE group of the respective pilot’s
or copilot’s circuit breaker panels.
The CAS illumination is specific to the engine vibration monitor system:
OIL TEMPERATURE INDICATOR
Oil temperature is displayed for each engine as a white digital readout.
The display consists of an OIL ° C legend with temperature readouts to
the left and right. An engine-mounted transducer transmits oil temperature
signals to the DAU. The DAU then provides an oil temperature
value for EICAS. Refer to the following table for temperature ranges
and corresponding color displays during normal engine operation:
CAS Color Description
ENG VIB MON White Vibration level, in the associated (L or R)
engine, is higher than normal.
ALTITUDE
FT
WHITE
°C
AMBER
°C
RED
°C
<30,000 30 to 127 -53 to 29
-60 to -54
and
128 to 175
>30,000 30 to 140 -53 to 29
-60 to -54
and
141 to 175
Pilot’s Manual
2-16 PM-132A
OIL PRESSURE INDICATOR
Oil pressure is displayed for each engine as a digital readout on EICAS.
The display consists of an OIL PSI legend with pressure readouts to the
left and right.
Refer to the following table for pressure ranges and corresponding color
display during normal engine operation:
FUEL FLOW INDICATOR
Fuel flow is displayed for each engine as a white digital readout on
EICAS. The display consists of a FF PPH legend with flow rates to the
left and right. The fuel flow rates are presented in Pounds-Per-Hour
(PPH). A fuel flow transmitter located in the main fuel line of each engine
supplies fuel flow signals to the DAU via a fuel flow converter. The
DAU then provides a fuel flow rate value for EICAS presentation.
N1 INDICATORS
The fan speed (N1) analog EI for each engine consists of a needle, arc,
and N1 bug with integral digital readouts for N1 and N1 setting. The N1
sensor is mounted in the engine’s rear bearing support housing and
senses low-pressure fan speed. The sensor provides signals to the
DEEC and DAU. Refer to the following table for N1 speeds and corresponding
color display.
(% N2) WHITE
PSIG
AMBER
PSIG
RED
PSIG
<80% and up to
3 minutes after
engine start
65 to 80 50 to 64
0 to 49
and
126 to 150
>80% or more
than 3 minutes
after engine start
65 to 80 50 to 64
0 to 49
and
101 to 150
WHITE
% N1
AMBER
% N1
RED
% N1
0 to 100.0 N/A 100.1 to 115*
*Above 115% the digits are invalid.
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