The team's first task was to decide what equipment could be salvaged.
The investigators studied flight recorders salvaged from the wreckage.
I don't get why not 'were salvaged' but 'salvaged' was employed in the second example.
The investigators studied flight recorders (that/which were) salvaged from the wreckage. The following would be wrong: The investigators studied flight recorders were salvaged from the wreckage.
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The investigators studied flight recorders (that/which were) salvaged from the wreckage.
The following would be wrong:
The investigators studied flight recorders were salvaged
The investigators studied flight recorders salvaged from the wreckage.
The underlined constituent is a past-participial clause modifying "flight recorders".