DaveReidUK
Not including this accident, Wiki lists 38 accidents where at least one recorder was either unrecovered or unusable. Of these 38:
15 - Aircraft wreckage located but no recorders found
4 - Aircraft wreckage located, FDR found, CVR not found
2 - Aircraft wreckage located, FDR not found, CVR found
10 - Aircraft wreckage located, both recorders located, at least one was unusable due to damage (in some cases, potentially only one installed)
7 - Aircraft wreckage never located, or other nefarious dealings involving corrupt governments.
https://en.wikipedia.org/wiki/List_o...ight_recorders