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IRS

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Hi all,Can someone answer a quick question on IRS alignment on the A340? When you push the 'ALIGN IRS' promt on the CDU, does this start the 10 min align process of the IRS or does it simply send the coordinates from the CDU to the IRS which are already aligned? I ask because I always thought that when you moved the switch from OFF to NAV on the ADIRS panel, the 10 min align process started and then 3 min before pushback, the 'ALIGN IRS' promt was pushed on the CDU to send the coordiantes form the CDU to the IRS. So how exactly is the IRS aligned?Cheersrichard

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Rici,Normally, the IRS will start its alignment procedure as soon as it is selected on. It will start the 10 minute countdown and will stop at the 1 minute mark and hold there until a position is inserted either via the keypad or the FMC CDU and will then complete the alignment.Hope this helpsRegardsPaul GollnickTechnical Operations/Customer Operational SupportPrecision Manuals Development Group[www.precisionmanuals.com]

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Nothing personal Rici, but why do you want to know?Just curious.BC

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