I believe you may be refering to
Flight Manual BK 117 C-2
Para 4.13.2
Warning
AVOID STEEPRIGHT TURNS AT AIRSPEEDS BELOW 70KIAS CLOSE TO THE GROUND IN ORDER TO MAINTAIN SUFFICIENT LATERAL CONTROL MARGIN FOR RECOVERY.
Lateral control characteristics of single rotor helicpters are significantly influenced by forward speed (airspeed), bank angles and related g-loads.
During high load factor maneuvers at airspeeds below 70 KIAS the cyclic stick can reach the left lateral stop before retreating blade-stall entry.
Reduction of the load factor and/or nose-left side slip will improve lateral control margin.
Any pilot with flying time on the beast care to comment?
Last edited by RotorPig; 24th Oct 2005 at 10:17.