Q: Is it acceptable to fasten two D-Rings
into the roof or structure, and string aircraft cable between them in order to
create a mobile retractable tie off point?
A: Horizontal lifelines shall be designed,
installed, and used under the supervision of a qualified person, maintaining a
safety factor of at least two. Also, Dee-Rings must have a minimum tensile
strength of 5,000 pounds. The lifeline should also be able to support
5,000 pounds of force for each employee attached.
