From the RR 250-C47B (B407) Operation and Maintenance Manual (Sep 09): Fuel Specifications
"(2) Emergency
Operation on ASTM D-910 AVGAS, all grades, is permitted for a maximum of six hours for each turbine overhaul period if aircraft boost pumps are available and turned on."
No mention of diesel or other non aviation fuels. Avgas containg TCP is not permitted. Likely would run on diesel but would probably become unairworthy from a regulatory standpoint if done, requiring at least an inspection and possibly an overhaul (not to mention possible liability issues). So if its REALLY an emergency, might be worth it!
Last edited by EN48; 15th May 2011 at 22:49.