Definition
The set of navigation systems installed and operational in an aircraft that determine which routes, procedures, and approaches the pilot is authorized and able to fly. This includes equipment such as VOR, DME, ADF, GPS, RNAV, and RNP systems, along with any required certifications or operational approvals tied to that equipment.
Plain English
What navigation gear the aircraft has on board and is allowed to use. This decides which airways, approaches, and routes the pilot can actually fly.
Context Anchor
Seen when a pilot gives flight information to air traffic control, files an instrument flight plan, or reports whether the aircraft can accept a requested route or procedure.
Derivation
Navigation comes from older words meaning to direct or manage a ship on a journey. In aviation, the idea is the same: guiding the aircraft along a planned path. Capability means practical ability, not just having equipment listed on paper.
Why Pilots Care
Determines whether an aircraft may be cleared for a given RNAV, RNP, or ground-based approach.
Intuition Check
Do not assume capability means every navigation device installed in the panel. Here it means the equipment is installed, working, approved for the operation, and available for the flight.
Example Sentence 1
The pilot reported the aircraft's navigation equipment capability to ATC so the controller could assign a suitable RNAV arrival.
Example Sentence 2
Aircraft with basic navigation equipment capability are limited to conventional VOR and ILS procedures.