This Westwind was equipped with a FDR?
I only ask because none of the Westwinds I've flown had one. (US registered) Does AUS require FDRs in 9 pax or less jets?
The Westwind CVR playbacks I've listened to were of much more recent vintage than 4 years and still the audio quality was dubious! But then these were old analog CVRs not modern digital units. Any idea what type was installed on the Westwind in question? I am doubtful about the likelihood of recovering useful data from an analog unit that's been submersed in warm saltwater for 4 years.
Best,
westhawk