Hello.
Mods done on '47s are not enough (different pumps, different porcedures). Procedure change for the CT is Ok but suggestion by NTSB was to get the vapors inert i.e. to neutralize them.
That system is installed on large military cargo a/c (C-5 for example) and the outcome was very, very obvious in the Dover crash (no fire and all the crew was soaked in fuel).
therefore like so many other NTSB recommendations the overall airline industry is ignoring it as too pricey.
Cheers