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. Manually control closing and opening of the HPSOV.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
POWER PLANT
Engine Run Switches (Cont’d)
. Indicate to the EEC the Engine Run switch position and perform a dual channel reset and to close the HPSOV in the Fuel Management Unit (FMU).
GF1810_079
The Engine Run switch controls the respective HPSOV. The switch in the ON position enables the HPSOV open and the switch in the OFF position enables the HPSOV closed.
The Engine Run switch in the ON position gives EEC authority to open HPSOV during an automatic ground or air start. When the switch is set to the OFF position, the HPSOV will close.
The Engine Run switch in the ON position will directly command the EEC to open the HPSOV during a manual ground or air start. When the switch is set to the OFF position, the HPSOV will close.
The EEC will override an Engine Run Switch ON command by closing the HPSOV only for an automatic start abort or relight abort or in the case of an overspeed.
The transition ON to OFF initiates a reset of both lanes of the EEC of the associated engine and will also send a signal to command the starter air valve to close.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
POWER PLANT
STARTING AND IGNITION (CONT'D)
Engine Starting
AUTO Start . Ground
The normal start sequence is initiated automatically, with the ENGINE START switch selected to AUTO, IGNITION switch selected to Normal (default), thrust levers IDLE and the engine RUN switch to ON. The APU is the normal source of air during ground start.
NOTE
The engine data quoted in this example are approximate values.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
POWER PLANT
STARTING AND IGNITION (CONT'D)
Engine Starting (Cont’d)
AUTO Start . Ground (Cont’d)
At approximately 15% N2, ignition occurs.
IGN
Annunciation
FGF1810_004 FGF1810_003
At approximately 20% N2, fuel flow active and light off will occur at approximately 25% N2.
IGN
Annunciation
NOTE
The engine data quoted in this example are approximate values.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
CSP 700.5000.6 18.10.59
POWER PLANT
STARTING AND IGNITION (CONT'D)
Engine Starting (Cont’d)
AUTO Start . Ground (Cont’d)
At approximately 42% N2, IGN off and at approximately 45% N2 START off (SAV closed).
At Idle
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
18.10.60 CSP 700.5000.6
POWER PLANT
STARTING AND IGNITION (CONT'D) Engine Starting (Cont’d) Rotor Bow
If the BR710-20 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 high-pressure spool and subsequent distortions of the rotating assembly.
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