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21 November 2021
- 07:1407:14, 21 November 2021 diff hist +1,750 N Inertial reference unit Removed the claim "they mainly have application in guided missiles". Not so! Most (all?) modern airliners have inertial reference units. 737s have two redundant units that drive the left and right primary flight displays (atittude indicators and gyro compass). These instruments don't display at all until the IRUs have been aligned. CRJs ditto. A320s ditto. current