AMC2 NCC.IDE.A.120 Operations under VFR – flight and navigational instruments and associated equipment
CAA ORS9 Decision No. 1
LOCAL FLIGHTS
For flights that do not exceed 60 minutes’ duration, that take off and land at the same aerodrome and that remain within 50 NM of that aerodrome, an equivalent means of complying with NCC.IDE.A.120(a)(5) & (b)(1)(i) may be:
(a) a turn and slip indicator;
(b) a turn coordinator; or
(c) both an attitude indicator and a slip indicator.