I have always been impressed by the excellent dispassionate nature of AAIB reporting. But recently there has been a lapse. As an example, in the 10/2005 G-HASO report, the AAIB made inappropriate recommendations for mods to the Thielert diesel engine, after FOD ingestion. The LBA (German 'CAA' responsible for the aircraft's certification) rejected their proposals, pointing out that the 'protection' offered by the mod was against a mechanic leaving a tool in the previously filtered air inlet - and aviation mechanics should not do that! Well done LBA and a win for common sense!
Unfortunately, the AAIB report tried to justify their recommendation in the face of this rejection. Methinks they protesteth too much.
Dave