A tower crane is being operated in winds measuring 28 mph with gusts to 35 mph. According to typical manufacturer specifications, what action should be taken?
Correct Answer
C) Cease lifting operations and secure the crane
Most crane manufacturers specify that lifting operations should cease when wind speeds reach 25-30 mph. At 35 mph gusts, the crane should be secured in accordance with manufacturer recommendations to prevent structural damage or accidents.
Why This Is the Correct Answer
CORRECT_ANSWER - Tower crane manufacturers typically specify that lifting operations must cease when wind speeds reach 25-30 mph sustained winds. With winds at 28 mph and gusts to 35 mph, this situation clearly exceeds safe operating parameters. The crane must be secured according to manufacturer specifications to prevent structural damage, load swing, and potential accidents. Continuing any lifting operations in these conditions would violate safety protocols and could result in catastrophic failure.
Why the Other Options Are Wrong
Option A: Continue normal operations
Continuing normal operations in 28 mph winds with 35 mph gusts is extremely dangerous and violates manufacturer safety specifications. Most crane manufacturers prohibit lifting operations when winds exceed 25-30 mph, making normal operations completely inappropriate and potentially catastrophic.
Option B: Reduce load capacity by 25%
Simply reducing load capacity by 25% does not address the fundamental safety issue of high wind conditions. Wind affects crane stability, load control, and structural integrity regardless of load weight. Manufacturer specifications call for complete cessation of lifting operations, not load reduction.
Option D: Only perform critical lifts with reduced radius
Performing any lifting operations, even critical lifts with reduced radius, is prohibited when wind speeds exceed manufacturer limits. The wind conditions (28 mph with 35 mph gusts) make all lifting operations unsafe regardless of the load's importance or the crane's operating radius.
Memory Technique
Think '25 and STOP' - when winds hit 25-30 mph, all crane lifting operations must STOP completely, no exceptions or modifications allowed.
Reference Hint
OSHA 29 CFR 1926 Subpart CC (Cranes and Derricks) and manufacturer's operating manuals for wind speed limitations
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