| # | Standard Interpretations |
|---|---|
| 1 | - 1926.551 - Hooking and Unhooking Loads with a Helicopter During Work on Electric Transmission Systems |
| 2 | - 1926.551 - Line maintenance on a de-energized transmission line. |
| 3 | - 1926.551(i) - "Hooking and Unhooking Loads from Hovering Helicopters". |
| 4 | - 1926.551(l) - Using a helicopter to set an electrical transmission tower. |
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