The items below are the currently open NTSB recommendations regarding intermodal transit 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.
- OAA - Open Acceptable Response
- OAAR - Open Acceptable Alternate Response
- OUA - Open Unacceptable Response
- ORR - Open Response Received
- OAR - Open Await Response