Standard Interpretations
OSHA requirements are set by statute, standards, and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Each letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information.
- 1926.551 - Hooking and Unhooking Loads with a Helicopter During Work on Electric Transmission Systems - 08/01/2012
- 1926.551 - Line maintenance on a de-energized transmission line. - 01/09/1987
- 1926.551(i) - "Hooking and Unhooking Loads from Hovering Helicopters". - 11/20/1974
- 1926.551(l) - Using a helicopter to set an electrical transmission tower. - 01/27/1975