Definition
Helicopter-specific Standard Instrument Approach Procedures that use GPS, or GPS augmented by WAAS, as the primary navigation source. These approaches are designated 'Copter' in the procedure title and are designed around helicopter performance characteristics, including slower approach speeds, tighter turn radii, and the ability to use lower minimums than equivalent fixed-wing procedures. They are charted on FAA approach plates for use at airports and heliports and must be flown in accordance with the limitations published on the chart.
Plain English
These are instrument approaches built specifically for helicopters that use GPS — or a more accurate version of GPS called WAAS — to guide the aircraft down to the runway or landing pad. Because helicopters fly slower and turn tighter than airplanes, these approaches can bring a helicopter in lower and closer than a fixed-wing approach to the same location.
Context Anchor
Seen on helicopter instrument approach charts and in discussions of GPS-based approaches to airports or heliports.
Derivation
Copter' is a shortened form of helicopter, used by the FAA to mark procedures restricted to rotorcraft. 'SIAP' simply names the formal category of charted instrument approaches. Knowing 'Copter' signals 'helicopters only' helps the pilot immediately recognise that fixed-wing aircraft cannot fly these procedures.
Why Pilots Care
These procedures enable helicopters to fly instrument approaches to places without traditional navigation aids, increasing access and safety in poor weather.
Intuition Check
Do not read copter as casual slang here; it identifies a helicopter-specific approach procedure. Standard does not mean easy or automatically usable; it means officially published and must still be checked against the aircraft, equipment, and conditions.
Example Sentence 1
The pilot briefed the Copter GPS approach to the hospital heliport, noting the lower minimums available compared to the nearby airport's fixed-wing GPS approach.
Example Sentence 2
Copter GPS or WAAS SIAPs allow helicopters to maintain precise guidance without relying on ground-based navigation equipment.