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庞巴迪环球5000公务机机组操作手册 Bombardier Global-动力装置(29)

时间:2011-11-11 09:42来源:蓝天飞行翻译 作者:公务机 点击:
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Any of the following events will result in a manual ground start abort:
.  
Crew selecting ENGINE RUN switch to OFF.

.  
Crew selecting the START SELECTOR switch to AUTO.

.  
Crew selecting the IGNITION switch to Normal.


Automatic Air Start Abort
Any of the following events will result in an automatic air start abort:
.  
Crew selecting ENGINE RUN switch to OFF.

.  
N2 speed not greater than or equal to 8% (60 seconds from ENGINE RUN switch ON).

.  
Idle speed not achieved (600 seconds from HPSOV open).

.  
Starter cutout not being reached within inflight starter duty timer (180 seconds from SAV open).


Rev 3, Apr 25, 2005 Flight Crew Operating Manual  Volume 2

POWER PLANT
 
Auto-Relight
The EEC provides an Auto-Relight function to detect and recover an engine flameout.
The Auto-Relight function is enabled when the engine is at or above Idle and the ENGINE RUN switch is ON.
Two methods are used to detect a flameout at all engine speeds at or above Idle:
.  
By monitoring the rate of change of N2. The threshold for the rate of change is calculated as a function of HP compressor pressure exit (P30) and altitude. A flameout is assumed to have occurred if N2 decelerates at a rate greater than this threshold.

.  
By monitoring the difference between commanded Idle N2 and actual N2. If the difference is greater than a preset threshold, a flameout is assumed to have occurred. This method is suppressed for 15 seconds, following a transition from low idle to high idle.


When a flameout is detected, the EEC will energize both igniters and schedule fuel flow until the engine relights. The igniters are energized for 20 seconds after an engine relight.
If the engine continues to run down (no relight), then the EEC will close the HPSOV at 35% N2 and de-energize the igniters and an EICAS message is posted.

GF1810_094
Quick Relight
The EEC provides a Quick Relight function which automatically relights the engine if the ENGINE RUN switch has been momentarily selected to OFF then re-selected to ON.
The Quick Relight functionality is defined as follows:
.  
Enabled only if inflight.

.  
Activated when ENGINE RUN switch is reselected ON within 30 seconds after selecting ENGINE RUN switch to OFF and N2 greater than or equal to Idle (42% N2).

.  
When Quick Relight activated, fuel is commanded ON and both ignition systems ON.


If N2 continues to fall below Idle speed, Quick Relight will maintain both the ignition systems and
fuel ON until the engine speed is regained for up to 20 seconds.
The crew can cancel Quick Relight by selecting the ENGINE RUN back to OFF.

Volume 2  Flight Crew Operating Manual Rev 2A, Apr 11, 2005
 
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