AIM ¶ 10-2-4 — EMS Multi-Helicopter Operations
AIM 10-2-4 explains recommended procedures for multiple EMS helicopters at landing zones and hospital heliports, including 123.025 MHz coordination.
When more than one EMS helicopter responds to the same scene or hospital, coordination prevents midair conflicts and confusion on the ground. AIM 10-2-4 lays out recommended (not regulatory) procedures to keep operations organized.
Landing Zone (LZ) Operations:
- The first helicopter establishes contact with the ground unit at least 10 NM out for an LZ briefing and reports how many helicopters are inbound.
- That helicopter then attempts to reach other inbound aircraft on 123.025 MHz to pass along LZ info and the ground unit's frequency.
- Subsequent helicopters check in on 123.025 MHz at least 10 NM from the LZ before contacting the ground unit.
- All helicopters monitor 123.025 continuously.
- If no LZ is set up yet, the first helicopter assigns altitudes and orbit positions — recommended 500 ft vertical separation, orbits on cardinal headings from scene coordinates. If altitude separation isn't possible, use 1 NM lateral between orbits.
- Before departing the LZ, broadcast position and route intentions on 123.025.
Hospital Heliport Operations: Always get a briefing from the hospital facility first. The helicopter nearest the pad coordinates with inbound traffic on 123.025 and advises whether offload will be rotors-turning or shut-down, plus expected duration.
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