Definition
The function of an aircraft's transponder system that automatically transmits the aircraft's pressure altitude to air traffic control radar, in addition to the basic transponder code. This is provided by a Mode C or Mode S transponder paired with an altitude encoder, and is required equipment for operations in certain controlled airspace.
Plain English
The aircraft can automatically tell air traffic control radar what altitude it is flying at, not just identify itself.
Context Anchor
Seen when checking what equipment is required before operating in certain types of airspace.
Derivation
Altitude comes from a Latin word meaning “height.” Reporting means sending information back. Capability means the ability to do something. Together, the phrase points to the aircraft’s ability to send height information automatically.
Why Pilots Care
Ensures compliance with airspace rules and allows ATC to provide traffic separation services.
Intuition Check
Do not read “altitude reporting” as only a pilot speaking an altitude on the radio. In this context, it means the aircraft’s equipment automatically sends altitude information electronically.
Example Sentence 1
Before entering Class B airspace, the pilot confirmed the transponder was switched to ALT, providing altitude reporting capability to approach control.
Example Sentence 2
ADS-B Out provides altitude reporting capability as part of its position broadcasts.