Dash 8 Q400 IRS

One of the popular google searches that is leading people to come here is the above and I realise it is not in my blog.

dash 8 alt selThe Q400 does not have an IRS system or an INS system.  It has something called a AHRS – pronounced “A-HARS”, which stands for “Altitude and Heading Reference System”.  It is a little computer that compares GPS (GNSS) with VOR/DME and slaves the compasses.  If this packs in, life will get more busy for the pilot.

The AHRS sits just behind the CDU circled in red.

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~ by globalste on May 6, 2012.

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