in his time the RNFSAIC had "allegedly", on occasion, been known to protect the careers of high flying officers with their "helpful" contributions to BoIs when, how can one say it, when one had clearly fcuked up somewhat.
Under the RN system of BOIs/Tech Investigations I simply cannot see this sort of thing happening. In the case of the current discussion if the evidence of "covered up" HISLs issues had been available to the BOI/AI guys it would have been included in their reports. The FAA has absolutely no interest in anything but the facts and truth so that accidents can be understood and lessons identified and learned.