16.I Environmental Considerations.
16.I.01 LHE must not be operated when wind speeds at the site attain the maximum wind velocity based on the surface/load ratio recommendations of the manufacturer.
- At winds greater than 20 mph (9 m/s), the operator, rigger, and lift supervisor must cease all crane operations, evaluate conditions and determine if the lift must proceed. This determination must be based on wind calculations per manufacturer's recommendations.
- The determination to proceed or not must be documented in the LHE/crane operator's logbook.
Safety in the Wind
16.I.02 Operations performed during weather conditions that produce icing of the LHE or reduced visibility must be performed at reduced functional speeds and with signaling means appropriate to the situation.
16.I.03 When lightning is observed, all LHE operations must stop. A determination must be made as to proximity to operation being performed. (Use a lightning detector or once lightning is seen, count the number of seconds until you hear thunder. Divide number of seconds by 5 to get the distance the lightning is away from you). If lightning is 10 miles away or less, work must stop until 30 minutes after the last audible thunder or visible flash of lightning. Plan work activities according to the latest weather forecast and be prepared to stop operations, until bad weather has safely passed. These actions must be documented (daily report, crane operator's log book, etc.).
16.I.04 For night operations, lighting adequate to illuminate the working areas while not interfering with the operator's vision must be provided. > See Section 7.
Knowledge Check Choose the best answer for the question.
16-14. When must the operator, rigger, and lift supervisor cease all crane operations, evaluate conditions and determine if the lift can proceed?
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