Saturday 12 February 2011

13th February 2011 - Wiring

Work is progressing on wiring the aircraft. Most of the major cabling is now in and all of the cables through the firewall are in place and the engine and gear mount final installed - no pictures until I've cable-tied it all in!

One bit that is fully cabled in is the information panel I have built for the aircraft. This shows from top left to bottom right:
Switchable time of day or flight elapsed time derived from the GPS
Outside air temperature
System Voltage
Track over ground in degrees true (compare the magnetic track in the GPS display
Ground speed in knots
Carburettor temperature
Alternator charge current

In addition the unit flashes the voltage annunciator slowly for one minute and then illuminates it permanently if the system voltage drops below 12V. If the voltage rises above 15V the annunciator flashes fast warning that the voltage regulation may have failed and the alternator should be turned off.

The unit also controls the carb temperature annunciator which illuminates to show a warning between -5 degree C and +10 degrees when there is possible carb icing conditions. The other annunciators which are not controlled by the system monitor show low oil pressure and when the autopilot is engaged.
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