It was case of discussion in our airline. I got an answer from ATR:
[B]Date: Tue, 25 Sep 2007 11:04:05 +0200
From:
[email protected]
Subject: Internet website : yaw damper disconnection
To:
[email protected]
Dear Sir,
The disconnection of the yaw damper for landing is not requested by any ATR procedure except in case of landing with one propeller feathered as stated in FCOM 2.02.12 p.2 (copy of this page is attached to this email).
Anyway, yaw damper can be disconnected in very short final (around 100 feet above ground) in case of landing with crosswind to ensure a smooth “crab” landing.
I trust this information will prove helpful.
Best regards.
Véronique Elaphos
Flight Operations support