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L E A R J E T 4 5
P I L O T T R A I N I N G M A N U A L
7-25
FOR TRAINING PURPOSES ONLY
FlightSafety
international
STARTER
A combined starter/generator is mounted in the
center on the front of the accessory gearbox.
When the start sequence is activated for a nor-
mal start, the DEEC will energize the start
relay (line contactor) closed, connecting elec-
trical power to the starter from the corre-
sponding generator bus. The power source to
the generator busses can be from aircraft bat-
teries, a ground power unit, or an APU (if in-
stalled). It is recommended that a GPU or
APU be used for start, particularly in cold
weather; however, a battery start may be made
if necessary at temperatures above 0 degrees
Celsius.
The L/R START switches are guarded with
hinged, clear plastic covers. The switches are
located on the left and right side, respectively,
on the engine/fuel control panel, on the center
pedestal (Figure 7-17). The start switch is a
momentary action switch with a white “ON” an-
nunciator that illuminates when the switch is de-
pressed, indicating the start relay is energized.
A “START” annunciator will also appear on
the EICAS (Figure 7-18) when the starter is
engaged. For each engine, “START” will ap-
pear vertically outboard of the N2, oil and
fuel flow digital displays. The START an-
nunciator will be green in color, but will turn
to amber if the starter relay is still energized
closed above 51% N2.
For a normal computer-on start, the DEEC
provides for automatic starting which allows
the power lever to be moved into the IDLE po-
sition before activating the starter. When the
start switch is momentarily depressed, the
N1
ITT
50.0
76
60
984
50.0
80
60
1002
N2
OIL PSI
OIL
°
C
FF PPH
550
550
75.0
75.0
IGN
IGN
S
T
A
R
T
S
T
A
R
T
Figure 7-18. EICAS Engine Start
Annunciations
Figure 7-17. Engine Start and Ignition Switches