A320 ADIRS POWER UP
Join Date: Mar 2012
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Hi,
There is no requirement to check the ON BAT light during the alignment. Airbus procedures mention that the light will come on "during 5 s" but that's about it.
There is no requirement to check the ON BAT light during the alignment. Airbus procedures mention that the light will come on "during 5 s" but that's about it.
If you turn all three IRS on quickly and the On Bat light stays on then you have to figure out which IRS is defective.This is why I turn them on slowly and watch the light illuminate and then extinguish for each IRS. I remember an A306 that had a problem with the DC circuity of an IRS so for me it is an old school practice.
Ground Warning If one of the 3 ADIRU's looses 115 VAC power (the ON BAT light on the ADIRS illuminates illuminates), the 'HORN MECH CALL' sounds with a time delay of 15 seconds, if the A/C is on GROUND. Parallel to this the ADIRU & AVIONICS VENT light in the nose well illuminates.
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IIRC, only IRS 1 is powered by battery in emer elec config. The other two are powered on ground only for 5 minutes or so... I guess checking the 2 and 3 On bat is pointless...
Only half a speed-brake
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Only half a speed-brake
I guess TL suggests that unlike AC ESS, the HOT BAT 2 would not be affected by the switching thus providing for 2 ADIRUs power.
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Only half a speed-brake