PT6A, You need to read he regs very carefully before you make the mistake of thinking an ATP pilot can sign anybody off for anything. The FAA are very clear on this. I have en-counted a FAA ATP pilot who signed somebody off under part 91 as an F/O on a "N" reg B400 in a foreign country. An act that actually required a full SIC type rating issued by a TRO. The ATP pilot had less than 40 hours on jets and on type, and therefor resulted in a situation where the PIC had less than 40 hours and the SIC had 1 hour. The regs clearly state this can only be done in the USA under an approved training program as mentioned by A Squared and The Dominican.