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Old 28th Nov 2012, 17:22
  #8 (permalink)  
Denti
 
Join Date: Mar 2001
Location: I wouldn't know.
Posts: 3,954
Boeing is probably one of very few OEMs that mixes IRS and AHRS. On the fail operational equipped 737s three attitude sources are needed, however only two IRS are installed. The third source is the AHRS from the ISFD (aka standby instrument). Weird setup, but works like a charm.
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