The items below are the currently open NTSB recommendations regarding highways and the OHMS responses. For copies of the specific letters containing the NTSB/OHMS dialog, click the link for the specific item and review the list of "Related Downloads" on the right.
- OAR - Open Acceptable Response
- OAA - Open Acceptable Action
- OAAR - Open Acceptable Alternative Action
- OUA - Open Unacceptable Action
- OUR - Open Unacceptable Response
- UCL - Unclassified (until NTSB Classifies)