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FF (PPH)
OIL TEMP
OIL PRESS
46.0
800
30
35
00.0
0
0
0
EPR
N1
ITT
AIL
1.65 1.65
TO
SYNC
L ENG SHUTDOWN
L FUEL LO PRESS
At Idle
FGF1810_006
TOTAL FUEL (LBS) 41550
1.00 1.02
0.0 25.5
15 360
14600 10000 14600 ND
STAB
NU
NL RUDDER
LWD RWD
NR
TRIMS
7.2
N2
FF (PPH)
OIL TEMP
OIL PRESS
63.6
680
45
71
00.0
0
0
0
EPR
N1
ITT
AIL
1.65 1.65
TO
SYNC
L ENG SHUTDOWN
L FUEL LO PRESS
BLEED/ANTIICE
42 42
AIR
COND
APU
HP
LP
PSI
L
LP
HP
R
PSI
POWER PLANT
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
18−10−60
STARTING AND IGNITION (CONT'D)
Engine Starting (Cont’d)
Rotor Bow
If the BR71020
engine is to be started between 20 minutes and 5 hours after the previous
shutdown, there is a high potential for high core vibration during the next start. This is known as
“Rotor Bow”, which occurs due to differential cooling of the highpressure
spool and subsequent
distortions of the rotating assembly.
In all manual ground starts, the operator must carry out an Extended Dry Crank (EDC)
procedure, consisting of motoring the engine prior to start, for a period of 30 seconds at the
maximum motoring speed achievable. However, during all automatic starts, the FADEC will
determine if the EDC procedure is required and carry it out automatically. In both manual and
automatic starts, it is permissible to continue the starting operation immediately following the
EDC procedure, without performing a spool down of the engine.
AUTO Start − Ground
During an automatic start the EEC will perform all checks for starting anomalies. If a fault is
detected, (hot starts, hung starts, etc.) the EEC will abort the start. The crew can stop the start
sequence anytime, by selecting the ENGINE RUN switch to OFF.
AUTO Start − Air
The EEC will determine if an “ATS ENVELOPE” (£ 249 knots) or a “WINDMILL ENVELOPE”
(³ 250 knots) will be performed. The type of start will be displayed on EICAS.
GF1810_085
ATS ENVELOPE WINDMILL ENVELOPE
or
The air start sequence is initiated, when the ENG RUN switch is selected to ON.
GF1810_086
NOTE
The type of start, ATS or WINDMILL, is latched at the moment that the ENG RUN switch is
selected to ON. The EEC will continue to attempt that type of start, regardless of subsequent
changes in airspeed or configuration.
ENGINE
L RUN R
OFF OFF
ENGINE
IGNITION L CRANK L CRANK
AUTO
ENG START
If ATS ENVELOPE (starter assisted air start) has been selected, the EEC will select the SAV
open, activate the starter motor, if N2 is below starter reengagement
speed (up to 42 % N2).
If WINDMILL ENVELOPE has been selected, the EEC will not select the SAV open.
The EEC will activate ignition immediately and open the HPSOV if N2 ³ 8%. At approximately
45% N2, IGN will deactivate.
POWER PLANT
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
18−10−61
STARTING AND IGNITION (CONT'D)
Engine Starting (Cont’d)
AUTO Start − Air (Cont’d)
During an automatic start the EEC will perform all checks for starting anomalies. If a fault is
detected, the EEC will abort the start. (EEC will not abort an airborne relight, for hot starts).
The crew can stop the start sequence anytime, by selecting the ENGINE RUN switch to OFF.
Manual Start − Ground
The manual ground start sequence is as follows:
· Crew selects IGNITION switch ON.
GF1810_087
· Crew selects the START SELECT switch to CRANK for the appropriate engine.
GF1810_088
NOTE
The engine data quoted in this
example are approximate values.
1.00
0.4
15
N2
FF (PPH)
OIL TEMP
OIL PRESS
10.0
0
21
10
EPR
N1
ITT
TO
SYNC
1.65
START
L CRANK L CRANK
AUTO
ENG START
POWER PLANT
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
18−10−62
STARTING AND IGNITION (CONT'D)
Engine Starting (Cont’d)
Manual Start − Ground (Cont’d)
· At 20% N2, crew selects the ENGINE RUN SWITCH to ON. Fuel flow and light off occur.
　
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