FAR 1.1
Pilot in command means the person who:
(1) Has final authority and responsibility for the operation and safety of the flight;
(2) Has been designated as pilot in command before or during the flight; and
(3) Holds the appropriate category, class, and type rating, if appropriate, for the conduct of the flight.
The student pilot is ACTING as pilot in command on a solo flight. Without 61.51, he would not be able to LOG it as PIC.
That's my take on it. Could be wrong.
Pilot in command means the person who:
(1) Has final authority and responsibility for the operation and safety of the flight;
(2) Has been designated as pilot in command before or during the flight; and
(3) Holds the appropriate category, class, and type rating, if appropriate, for the conduct of the flight.
The student pilot is ACTING as pilot in command on a solo flight. Without 61.51, he would not be able to LOG it as PIC.
That's my take on it. Could be wrong.