Cal. Code Regs. Tit. 8, div. 1, ch. 4, subch. 13, app A
Do not approach or leave a helicopter while its engines are running unless the pilot or designee signals that it is safe to do so. Approach and leave the helicopter on a level with the craft or on a lower level, never from or to ground higher than that of the helicopter. Carry all materials to or from the helicopter in a horizontal position, not above waist level.
Do not place explosives, flammables, corrosives, or other dangerous materials on board any aircraft without the pilot's knowledge. Do not smoke within 50 feet of the helicopter, fuel storage, or fueling operation. Turn off the radio transmitter when in the vicinity of explosives or an explosive-loading operation.
Notify the person in charge of the project when you erect a suspended line, tower, or other navigational hazard. Know the escape procedure at each operation site. Always watch the helicopter, sling load, hook, or bottom end of the cable to avoid being hit. Listen to and be familiar with the normal sounds emitted by the helicopter in flight so that you will have the earliest notice of trouble and can avoid dangerous exposure.
Passengers transported by helicopter shall obey the following:
(1) Board and depart only on instructions from the pilot.
(2) Use seat belts during take-off, flight, and landing.
(3) Remain seated during the time aboard.
(4) Do not smoke unless permitted by the pilot.
(5) Do not talk unnecessarily to the pilot.
(6) Watch for other airborne aircraft and navigational hazards, and call them to the attention of the pilot.
Cal. Code Regs. Tit. 8, div. 1, ch. 4, subch. 13, app A