An interior inspection and maintenance crew shall be available at all times and shall consist of at least three men, one of whom is a foreman or his immediate assistant. One man during the period of inspection shall remain on the upper landing or gallery in such a position where he can be in constant communication with the men on the piston. Where practicable telephonic communication with the engineers or supervisor's office shall be available to the man on the upper landing or gallery. All members of the crew shall be instructed and periodically drilled in the Schaefer method of resuscitation.