bose-x, UK CAA or JAA reqs are tad different. Much less 'cross-crediting'..
B2N2 states it correctly.
I presume you have at least one FAR/AIM gym weight around or FAA website should you please..
NH2301, well, that's why some heli schools advertise 50hr heli CPL add-on. Well, some prodigy guys and gals might do it within 'reasonable minimums', ie learning to fly helis ASAFP to fly enough solo and post-PPL PIC time and more importantly some XC time as well. I don't really get FAR in terms of this 50hr minimum when it's so unlikely one gets that good in helis that fast and satisfies PIC and XC time requirement (35 PIC helis and 10h XC) plus night VFR solo in helis, etc Well, ehm, hmm, right. 50hrs is all everyone with planks FAA CPL needs..
Not many fixed wing schools advertise airplane CPL add-on as it's not so easy on the eye in terms of minimums (not to mention proficiency for some) and not many rotary guys go FW to get CPL. I've seen only one US website mentioning CPL (A) 'add-on'.
As with any ratings and certificates, one must not only satisfy stated minimums, but also proficiency to pass the checkride.
Unless FAA system changes considerably, I'm planning to take advantage of this cross-crediting towards airplane CPL (time from helis and gliders) to cut out some 'hole-boring' hour building when I will be proficient enought to pass checkride. "Cutting slack" on heli training, hmmm. Not that easy, guys. Even if you pass with sub-100TT helis, how likely are you getting heli CFI job??
REMOVED EDIT: After "Whirls'" reminder I went to that post I remembered, but it was HillerBee, not WhirlXYZ with low heli TT according to his past posts, but I think that's just luck and being great with the stick.
That was CFIing in S300 naturally, not in R22 which is famous for SFAR73 (min 200TT helis and 50 R22/R44 mix to instruct in R22/44) making it any quick add-ons useless unless you have daddy who'll let you play with his chopper doing something commercial and he can afford staggering insurance premiums for such low time heli pilot..
FAR 61.129 (probably bit outdated thing but handy as it's on certain site)
For an airplane single engine rating:
If you are applying for a commercial pilot certificate with an airplane category and single engine class rating, you must log at least 250 hours of flight time as a pilot (of which 50 hours, or in accordance with FAA Part 142, a maximum of 100 hours may have been accomplished in an approved flight simulator or approved flight training device that represents a single engine airplane) that consists of at least:
100 hours in powered aircraft, of which 50 hours must be in airplanes.
100 hours of pilot in command flight time, which includes at least 50 hours in airplanes and 50 hours in cross-country flight in airplanes.
20 hours of training on the areas of operation as listed for this rating, that includes at least 10 hours of instrument training, of which at least 5 hours must be in a single engine airplane, 10 hours of training in an airplane that has a retractable landing gear, flaps, and a controllable pitch propeller, or is turbine-powered, one cross- country flight of at least 2 hours in a single engine airplane in day VFR conditions, consisting of a total straight-line distance of more than 100 nautical miles from the original point of departure, one cross-country flight of at least 2 hours in a single engine airplane in night VFR conditions, consisting of a total straight-line distance of more than 100 nautical miles from the original point of departure.
10 hours of solo flight in a single engine airplane, including one cross-country flight of not less than 300 nautical miles total distance and as specified, and 5 hours in night VFR conditions with 10 takeoffs and 10 landings (with each landing involving a flight in the traffic pattern) at an airport with an operating control tower.