Altitude alerting system or device: Turbojet-powered civil airplanes

Altitude Alerting System Requirement for Turbojets

All turbojet-powered U.S.-registered civil airplanes must have an approved, working altitude alerting system. This system must alert pilots when approaching a preselected altitude during climbs or descents—either through combined visual and aural signals, or visual signals when approaching plus aural signals when deviating from the selected altitude. The system must work from sea level to the airplane's maximum operating altitude, allow altitude preselection in appropriate increments, and be testable without special equipment.

Below 3,000 feet AGL, only one signal type (visual or aural) is required.

Operators must establish procedures for using the system, and crews must follow them.

Exceptions allow operations without a working system for: experimental aircraft, ferrying newly acquired aircraft to installation sites, continuing flights after in-flight failures (but not departing where repairs are available), ferrying to repair facilities, airworthiness tests, foreign sales demonstrations, and related ferry/training flights.

*This is a plain-English summary for study only. The official 14 CFR text on this page is controlling — always read the current regulation and consult a CFI.*