Plus or minus 50 ft rings a bell ( 100Ft in total)........... can give you the info where to source it but cannot remember the book of words it is in.. have a copy at work if i remember and that is a big If I will look monday and tell you were to find it............PMi'ing me may help remind me
Emailed the SRG........ Lol thats a larffff
They issued the first copy of the New Licencing Guide for Engineers and one of their fopars in that when describing an example of aircraft one could take to get a group.......... namely "twin piston engined pressurised Cessna metal aircraft" the two examples listed were the Cessna 500 ( Citation Jet) and the Cessna 441 ( "TurboProp" ) Spot the delibrate lack of pistons in any of them, so what chance have you of getting a correct answer
I actually phoned them up and pointed it out which was corrected in the next issue..............