tripleburger
14th Apr 2012, 10:40
Hello Gents,
I'm looking for clarification of the indications of engine overboost on the B737-400. The indications to my knowledge are that a red light illuminates on the N1 gauge if overboost occurs and remains illuminated for as long as the condition exists. It will therefore extinguish once the overboost condition ceases. The LED will indicate the N1 reading and do not brighten in intensity.
Only EGT indication brightens during engine start up if a temperature exceedance is likely due to rapid rise in temperature approaching 725 deg C; the LEDs on the EGT increase in intensity during this situation.
The brightening in intensity of LEDs on N1 does not happen in any condition but does occur for a Hot start on the EGT gauge; it is therefore not an indication of overboost.
Any assistance or details on these points would be really appreciated. Also, if anyone has knowledge of overboost indication on the 757 I'd be interested to know more. However, it is really the 737 that I'd like to resolve.
Thanks
I'm looking for clarification of the indications of engine overboost on the B737-400. The indications to my knowledge are that a red light illuminates on the N1 gauge if overboost occurs and remains illuminated for as long as the condition exists. It will therefore extinguish once the overboost condition ceases. The LED will indicate the N1 reading and do not brighten in intensity.
Only EGT indication brightens during engine start up if a temperature exceedance is likely due to rapid rise in temperature approaching 725 deg C; the LEDs on the EGT increase in intensity during this situation.
The brightening in intensity of LEDs on N1 does not happen in any condition but does occur for a Hot start on the EGT gauge; it is therefore not an indication of overboost.
Any assistance or details on these points would be really appreciated. Also, if anyone has knowledge of overboost indication on the 757 I'd be interested to know more. However, it is really the 737 that I'd like to resolve.
Thanks