factsonly
5th Mar 2008, 09:31
Hello Gentlemen,
This is my first post on this particular forum so I ask for your patience. On the A320 with the V2500 engines and presumably also the CFMs, the grey background on the N2 disappears when the engine has rolled back and stabilised at idle. Having checked and trained on the aircraft for many years, I have always gone and espoused the line that the grey background disappears when FADEC is satisfied that the engine has started properly and (I assume) has gone out of what I would call a 'start mode' into a normal engine monitoring mode. To add to the confusion, the grey background is also there on a manual start and the FCOM makes it clear that start protections are not available. Unfortunately, I cannot find any reference to support this in the FCOM and I don't want to be telling people information that is incorrect so can anyone tell me when the grey background is supposed to disappear and also what it signifies? References would be useful. I am sure this has come up before and I apologise for flogging a dead horse but I would like to be able to put this one to bed.
This is my first post on this particular forum so I ask for your patience. On the A320 with the V2500 engines and presumably also the CFMs, the grey background on the N2 disappears when the engine has rolled back and stabilised at idle. Having checked and trained on the aircraft for many years, I have always gone and espoused the line that the grey background disappears when FADEC is satisfied that the engine has started properly and (I assume) has gone out of what I would call a 'start mode' into a normal engine monitoring mode. To add to the confusion, the grey background is also there on a manual start and the FCOM makes it clear that start protections are not available. Unfortunately, I cannot find any reference to support this in the FCOM and I don't want to be telling people information that is incorrect so can anyone tell me when the grey background is supposed to disappear and also what it signifies? References would be useful. I am sure this has come up before and I apologise for flogging a dead horse but I would like to be able to put this one to bed.