Question E0A11:
To what should lanyards be attached while climbing?  

Choices:  
A: Antenna mast  
B: Guy brackets  
C: Tower rungs  
D: Tower legs    

Correct Answer is  D: Tower legs  

Correct answer: D — Tower legs

Why D is correct:
- Tower legs are the primary structural members designed to carry high loads. They are the safest, most reliable anchorage points for fall protection.
- Attaching your lanyard to a leg (ideally above your position) minimizes free-fall distance and avoids loading components not intended for shock loads.

Why the others are incorrect:
- A: Antenna mast — Not a structural anchorage; may rotate, bend, or fail under shock load. It’s not rated for fall arrest.
- B: Guy brackets — Intended to connect guy wires, not to arrest a fall. Shock-loading them can damage the guy system or the tower.
- C: Tower rungs — Often not rated as anchor points; rungs/step bolts can tear out or bend under a fall. Use the tower legs or a rated ladder safety system.

Useful rules of thumb:
- Anchorage strength: $F_\text{anchor} \ge 5000\ \text{lbf}$ (about $22\ \text{kN}$) per attached worker, or be engineered to an equivalent safety factor.
- Keep the tie-off point above your harness D-ring to reduce free-fall distance and arresting forces.
- Maintain 100% tie-off: always be connected with at least one lanyard.
- Avoid wrapping lanyards around sharp edges; use rated anchor straps/slings on the leg.