The wing mirrors are part of the fit required for a limited icing clearance.
Not, initially for the 332. The mirrors were originally required to monitor the snow build-up on the 330J's intake dam.
When the 332 was introduced in Aberdeen they were not fitted and were not going to be fitted because of weight until Doogal (RIP) had his double flameout.
Doogal got them both lit again and then all Bristows 332s sprouted mirrors virtually overnight.
Useful pieces of kit. No helicopter should be without them.
Same as the tail pylon hinge restraint. Just the rubber stopper until one started coming out of a 330J in 1978. They fitted a copy of the RAF 330C mod, a metal clamp. Come the 332 with a bigger rubber stopper. Had they learned? No, not until one came adrift again and the aircraft crunched in.