Text in force at CS23-6: from CS23-5, effective 15 Aug 2017.
(a) Certification in the normal category applies to aeroplanes with a passenger seating configuration of 19 or less and a maximum certified take-off mass of 8 618 kg (19 000 pounds) or less.
(b) Aeroplane certification levels are:
(1) Level 1 — for aeroplanes with a maximum seating configuration of 0 to 1 passengers;
(2) Level 2 — for aeroplanes with a maximum seating configuration of 2 to 6 passengers;
(3) Level 3 — for aeroplanes with a maximum seating configuration of 7 to 9 passengers; and
(4) Level 4 — for aeroplanes with a maximum seating configuration of 10 to 19 passengers.
(c) Aeroplane performance levels are:
(1) Low speed — for aeroplanes with a VNO or VMO ≤ 250 knots calibrated airspeed (KCAS) or a MMO ≤ 0.6; and
(2) High speed — for aeroplanes with a VNO or VMO > 250 KCAS or an MMO > 0.6.
(d) Aeroplanes not certified for aerobatics may be used to perform any manoeuvre incident to normal flying, including:
(1) stalls (except whip stalls); and
(2) lazy eights, chandelles, and steep turns, in which the angle of bank is not more than 60 degrees.
(e) Aeroplanes certified for aerobatics may be used to perform manoeuvres without limitations, other than those limitations established under Subpart G.
ED Decision 2017/013/R · Source