Why did he pitch up like a madman? This, to me, is the critical error.
In Normal law, overspeed is shown by a
red and black ladder. It is not that uncommon to suddenly arrive in an overspeed at high altitude (sudden wind shift etc) and you may have to disconnect and pull up to get the speed off.
█
█
█
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The low speed area on the tape is denoted by an
amber line and an
amber ladder and then a solid
amber bar. So no confusion there...
BUT
- A/P off.
- Alternate law.
- IAS incorrectly displayed as very low.
What do you get on the speed tape in alternate law at very low speed? A
red and black ladder filling your speed tape?
And what do you do when you suddenly see your speed consumed by red and black? Pull up pronto until you get your speed below the bottom of the red and black ladder.
Could it have happened this way?