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Altitude Description (ALD)

DGIF baseline 2026-1, the latest. Earlier baselines: timemap.

RDF: ald.ttl

Name

altitudeDescription

Datatype

Enumeration

Definition

The applicable interpretation of the stated altitude.

Synonyms

Speed Interpretation

Accepted

2013-10-18

Defined by

DFDD

Values

• ALD_1 Between
• ALD_2 At or Above
• ALD_3 At or Below
• ALD_4 Mandatory
• ALD_5 Recommended
• ALD_6 Expected
• ALD_7 As Assigned

Used by

• GA005 Airspace
• GA024 Terminal Arrival Altitude (TAA) Sector
• GA520 Air Refuelling Procedure
• GA210 Procedure Segment Leg

Source: DGIF 2026-1 QEA model, DGIWG. Standard: DGIWG 206-3. Licence: CC BY 4.0, © DGIWG.