Thanks CCC; the 1981 accident at Alerk Island cited in the 'helios' report was not exactly flown to exemplary standards:
AFTER WAITING 7 HOURS FOR THE WEATHER TO IMPROVE THE HELICOPTER WAS FINALLY DESPATCHED AT NIGHT IN IFR TO BE POSITIONED AT AN OIL RIG. DURING THE INSTRUMENT APPROACH TO THE OIL RIG THE CREW DESCENDED BELOW COMPANY MINIMUMS IN ICE/FOG. THE RADIO ALTIMETER WAS UNSERVICEABLE. TO SIGHT THE OIL RIG LIGHTS THROUGH THE ICE/FOG THE PILOT DESCENDED TO 150FT AGL ON HIS ALTIMETER. THE HELICOPTER STUCK THE SEA ICE AND CRASHED. TEMP CORRECTION NOT APPLIED.
at the very least, the RADALT being unserviceable should (under European regulations) have prevented a descent to below MDH + 200ft - based upon the lowest regional setting. It also does not say whether this was an ARA procedure.
This accident says more about the operator/pilot than any procedure.
Jim