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YD OFF
GLD MANUAL ARM
PARK/EMER BRAKE ON
<– FUEL XFER ON
TOTAL FUEL (LBS) 4155O
146OO 1OOOO 146OO
N2
FF (PPH)
OIL TEMP
OIL PRESS
93.4
575O
115
81
I
G
N
START START
I
G
N
ND
STAB
ITT
SYNC
DN DN DN
OUT
3O
GEAR
–TRIMS–
NL RUDDER NR
AIL
LWD RWD
7.2
NU
93.4
575O
115
81
235O
73.3
T/O
N1
SYNC
73.3
98.5 98.5
1.54
1.65
CRZ
EPR
1.54
1.65
789 789
GX_17_053
ENGINE VIBRATION
MONITORING UNIT
N1
SPEED
PROBE
N1
SPEED
PROBE
N2
SPEED
PROBE
AIRFRAME
LEFT ENGINE RIGHT ENGINE
VIBRATION
TRANSDUCER
VIBRATION
TRANSDUCER
N2
SPEED
PROBE
N2
FF (PPH)
OIL TEMP
OIL PRESS
93.4
575O
115
81
93.4
575O
115
81
VIB VIB
N2
FF (PPH)
OIL TEMP
OIL PRESS
N1 VIB
93.4
575O
115
81
1.1
93.4
575O
115
81
O.5
GX_17_054
N2 VIB Indication
If the N2 vibration monitor readings are greater than
1.0 in/sec then the VIB icon is displayed.
N1 VIB Indication
1. If the N1 vibration monitor readings are less than
0.5 in/sec, then the N1 VIB will not be displayed.
2. However, anytime VIB above N2 is displayed
then N1 VIB is displayed.
3. N1 VIB indications above 1.0 in/sec turn amber.
For Training Purposes Only
Sept 04
17-37
P I LOT T R A I N I N G GU I D E
POWER PLANT
STARTING AND IGNITION
The engine starting system consists of the Starter Air Valve (SAV), interfacing with
the EEC, and the Air Turbine Starter (ATS). Pneumatic bleed air is routed through the
SAV and drives the ATS, which in turn drives the HP compressor via the accessory
gearbox.
The EEC receives start commands from the cockpit. SAV position is fed to both EEC
lanes and is powered by 28 VDC.
The EEC also controls both high energy igniter boxes for starting and relighting and
the ignition system is powered by 28 VDC.
GX_17_055
PNEUMATIC BATT BUS
MANIFOLD
AIRPLANE
FUEL
SUPPLY
AIR TURBINE
STARTER (ATS)
IGNITION
EXCITER
BOX #1
IGNITION
EXCITER
BOX #2
ACCESSORY
GEARBOX
FUEL
PUMP
FUEL
PUMP
ENGINE
AIRFRAME FEED SOV
ENGINE
STARTER AIR
VALVE (SAV)
EEC
FUEL
MANAGEMENT
UNIT
(FMU)
HP
SOV
L
P
T
H
P
T
COMBUSTION
CHAMBER
HIGH-PRESSURE
COMPRESSOR
N1 Spool N2 Spool
Igniter
Plugs
Mechanical
Drive
Bypass Duct
F
A
N
Igniter
Leads
ENGINE
ENG START
IGNITION
ON
AUTO
L CRANK R CRANK
17-38 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
POWER PLANT
STARTER AIR VALVE (SAV)
The SAV controls the air supply to the starter motor. The SAV is controlled by either
channel of the EEC from crew input.
During AUTO ground starts the EEC will, on command from the crew, open the SAV,
initiate engine rotation, supply fuel and ignition and monitor engine parameters during
start. The EEC will also close the SAV, disengage the starter motor and switch off
ignition at starter cutout speed.
During manual ground starts, opening and closing of the SAV and HPSOV is
controlled by the crew. The EEC will control ignition sequencing, after ignition is
enabled by the crew.
The SAV can also be operated manually, by ground personnel, in the event of a valve
failure. The SAV is displayed on the BLEED/ANTI-ICE synoptic, anytime an engine
is not operating.
AIR TURBINE STARTER (ATS)
The ATS rotates the HP compressor to enable engine start.
The ATS comprises a single-stage turbine, a tungsten cutter (to cut off turbine, if rotor
bearings fail), a sprag-type clutch, an output drive shaft decoupler (prevents driving
the turbine, in the event the sprag clutch seizes) and an output drive shaft shear neck
(protects the gearbox, in the event the starter overtorques or seizes).
At starter cutout speed, the SAV is closed, the turbine loses speed, which disengages
the sprag clutch.
GX_17_056
BLEED / ANTI-ICE
APU
AIR
COND
L
40
PSI
40
PSI
　
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