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Cruising Level Direction (CLD)
DGIF baseline 2026-1, the latest. Earlier baselines: timemap.
RDF: cld.ttl
- Name
cruisingLevelDirection- Datatype
- Enumeration
- Definition
- The cruising level convention to be maintained during a significant portion of the flight along an airway.
- Description
- In general, standard cruising levels are odd altitudes when heading in an overall eastbound direction and even altitudes when heading in an overall westbound heading. For example, if an aircraft were heading on an overall track of 090, the aircraft would be able to fly at flight levels 230, 250, or 270, whereas if the aircraft were flying on an overall heading of 270, then that aircraft would be able to fly at flight levels 240, 260, or 280.
- Accepted
- 2013-10-18
- Defined by
- NFDD
- Values
- CLD_1 Odd Cruising Altitudes
- CLD_2 Even Cruising Altitudes
- Used by
- GA010 Air Traffic Service (ATS) Route Segment
Source: DGIF 2026-1 QEA model, DGIWG. Standard: DGIWG 206-3. Licence: CC BY 4.0, © DGIWG.