Lowering and Whistle Test
During a lowering operation, how many of you use a brake mechanism after the DCD? I don't recall using one during training but I have seen them shown in books. If you do use one, how do you mind the prusiks while lowering? It seems that without a brake, the lower system would not pass the whistle test (Say you lose control of the main line). Would you consider the safety line with tandem prusiks to qualify as the necessary backup and meet the whistle test?
What say you?