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Old 28th September 2006 | 23:24
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Dan Winterland
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Joined: Jun 2001
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From: Blighty
This is how the A320 works.

On the take off roll, the aircraft is in ground law - which is direct law. Normal laws are blended in from lift off, being fully introduced by 50' agl.

On landing, from 50', flare law is blended in and at touchdown you should be in full flare law. The attitude at 50' is remembered and at 30' the law introduces a 2 degree pitch down progressively over 8 seconds. This is similar to direct law inasmuch that sidestick movements have direct authority over control surface movement.

Some landing malfuntions (such as double rad alt fail) will pt the aircraft into direct law when the gear is extended. This is because the aircraft systems relying on the rad alts won't know how high you are so they assume landing from gear selection.

In all cases, the aircraft is in direct law on the ground.
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