41 C.F.R. § 51-6.1
(d) The central nonprofit agency shall keep the contracting activity informed of any changes in leadtime experienced by its nonprofit agencies in order to keep to a minimum requests for extensions once an order is placed. Where, due to unusual conditions, an order does not provide sufficient leadtime, the central nonprofit agency or the individual nonprofit agency may request an extension of delivery or completion date which should be granted, if feasible. If extension of delivery or completion date is not feasible, the contracting activity shall: