Upper ATS routes within the Damascus FIR operating above FL 150 are defined in the En-Route Charts. Routes include UR219, G202 (upper segment), R655 (upper segment), and associated route segments.
Detailed route definitions including waypoints, distances, and minimum en-route altitudes are shown on the published En-Route Charts.
Upper Route Structure
Upper ATS routes within the Damascus FIR (OSTT) are designated for traffic above FL245. These routes connect with adjacent FIRs (Ankara, Beirut, Amman, Baghdad) and are published in the ENR 3/4 route table.
| Parameter | Detail |
|---|---|
| Vertical Limits | FL245 — FL460 |
| Navigation Standard | RNAV 5 (RNP 5) or conventional (VOR/DME) |
| ATC Service | Damascus ACC (OSTT) |
| Separation Standard | Radar: 5 NM / Non-radar: 10 min longitudinal |
| Communication | HF and VHF as published in ENR 2.1 |
Upper routes are designated with the prefix U (e.g., UB17, UG4, UM860). See the interactive route table on the ENR 3/4 — ATS Routes & Waypoints page for detailed segment data.