Text in force at CS29-12: from CS29-0, effective 14 Nov 2003.
For each pilot compartment:
(a) The compartment and its equipm ent m ust allow each pilot to perform his duties without unreasonable concentration or fatigue;
(b) If there is provision for a second pilot, the rotorcraft must be controllable with equal safety from either pilot position. Flight and powerplant controls must be designed to prevent confusion or inadvertent operation when the rotorcraft is piloted from either position;
(c) The vibration and noise characteristics of cockpit appurtenances m ay not interfere with safe operation;
(d) Inflight leakage of rain or snow that could distract the crew or harm the structure m ust be prevented.
ED Decision 2003/016/RM · Source