A4
Although single-engine taxi is obviously possible, (with the other engine running but in a feathered condition) Bombardier does not approve the procedure as it does not provide sufficient electrical redundancy. The props need to be out of the feathered position for their associated AC gens to be online.
Any Flybe 400 pilot will tell you that the gear on their aircraft has certainly had some rough treatment over the last 5 years, but no such problems have arisen.