If the contractor is unable to meet the deadline for the performance of one or more obligations under the contract, or if such performance on time would require resources the mobilisation of which would place a manifestly excessive burden on the contractor, the deadline is extended by a period equivalent to the period of non-compliance with the performance deadline resulting directly from the exceptional circumstances, at the contractor’s request submitted before the expiry of the contractual deadline and before the expiry of the period of exceptional circumstances.