I agree that airspeed shouldn't matter, except for perhaps the cited case of the wing ends being close to a stall. I hadn't thought about yaw, but I think the change in direction is manageable for the few seconds it will take to retract the single flap.
Thanks to both of you for your thoughts. Still hoping others might share their view. My thinking is that, if you're concerned about a flap cable break, you might want to land with 1/3 flaps in fields with longer runways -- plus remember to shove the flap lever up if you have a sudden, unintended roll excursion.
Ernie
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