3.2 Radio Operations
Key Takeaways
- Match the radio to the audience: aviation VHF for air traffic control, UHF or VHF EMS for ground and medical traffic, satellite phone when both fail, and cellular only as a last backup
- Sterile cockpit during takeoff, landing, hover, and other critical phases means no non-essential clinical radio chatter until the aircraft is stable
- Standard radio discipline is who you are, where you are, and what you need, followed by a readback of drug doses and destination identifiers
- MAYDAY signals distress and PAN-PAN signals urgency; the flight nurse rarely keys the aviation radio but must tell the pilot when the cabin has become a medical emergency
- A lost-communications plan uses transponder 7600, satellite-phone or dispatch relay to air traffic control, and the remaining working radio for medical traffic
A flight nurse who cannot talk clearly is as dangerous as a flight nurse who cannot bag. Air traffic control (ATC), a referring charge nurse, online medical control, and a receiving trauma bay each need a different radio and a different sentence. Radio operations on the CFRN exam are about choosing the right path, keeping the cockpit sterile in critical phases, and closing the loop on every dose and destination.
Match the Radio to the Audience
Most helicopter emergency medical services (HEMS) cabins carry more than one external radio plus an internal intercommunication system (ICS).
| Path | Typical use | Flight-nurse trap |
|---|---|---|
| Aviation very high frequency (VHF) (about 118–137 MHz) | ATC, unicom, tower, approach | Keying this radio to give a hospital a clinical update |
| Ultra high frequency (UHF) or VHF EMS / 700–800 MHz public safety | Dispatch, landing-zone coordinator, ground EMS, receiving department | Using an open, unencrypted channel for full name, date of birth, and diagnosis |
| Satellite phone | Remote scene, instrument conditions, failed terrestrial radios, over-water or canyon work | Treating it as too slow to bother programming before launch |
| Cellular voice or data | Backup when you are on the ground or in coverage | Assuming a signal at cruise altitude or in a mountain shadow |
Cellular service is a convenience, not a plan. It drops at altitude and in rural canyons. If the only path to medical control is a personal phone, identify the satellite-phone or dispatch-relay backup before you lift.
Sterile Cockpit and Radio Discipline
Sterile cockpit means no conversation or radio traffic that is not required for safe aircraft operation during critical phases of flight: takeoff, landing, hover, confined-area and pinnacle work, and instrument approaches. A referring hospital that calls on short-final can wait unless the traffic is a true emergency — "the patient just lost pulses" is a reason to tell the pilot in command (PIC); "we found an old allergy to codeine" is not. Hold clinical traffic until the skids are on the pad or the aircraft is in stable cruise.
Who, where, what you need
Every external transmission should answer three questions, in order:
- Who you are — aircraft call sign or program name and your role ("AirCare 3 flight nurse").
- Where you are — hospital name, landing-zone identifier, altitude and heading if ATC cares, or "five minutes out, north approach."
- What you need — a specific request, not a narrative. "Need online medical control for a rapid-sequence intubation dose" is a radio call. "So this guy was in a wreck and then the CT was bad and then…" is a hallway story.
Then stop talking and listen. Do not coach the pilot on the aviation radio unless the PIC has handed you that task.
Online medical control is a physician (or protocol-designated clinician) who can give orders that exceed standing protocols. Treat every drug order as a closed loop: you request with weight and allergies; control states drug, dose, route, and timing; you read back those four facts; control confirms; you give the drug and report that it is in. Destinations get the same treatment. Read back the receiving hospital name and the assigned pad — "University North helipad, not the downtown campus."
Instrument Versus Visual Communications
Under visual flight rules (VFR), the PIC may be on a local advisory frequency, taking flight following, or working a scene with a landing-zone officer on EMS UHF. Position reports are often informal: location, altitude, souls on board, and intentions. Under instrument flight rules (IFR), ATC owns the conversation. Your clinical work moves to the EMS radio, satellite phone, or an ICS patch. Give the PIC one sentence — "patient now requires priority handling for expanding pneumothorax" — and let the PIC decide whether to declare an urgency with ATC.
Distress, Urgency, and Lost Communications
Know the words even if you never key the aviation microphone.
- MAYDAY (repeated three times) is distress: grave and imminent danger — fire, dual-engine failure, impending crash. It commands radio silence on that frequency.
- PAN-PAN (repeated three times) is urgency: serious but not yet distress — a single-engine precautionary, a sick crewmember, or a patient who now needs priority handling.
The PIC makes the call. Your job is to say on the ICS whether the cabin problem is urgency or distress.
A lost-communications plan belongs in the pre-mission brief:
- Squawk 7600 if the aviation radio is dead and you are talking to ATC by other means or proceeding IFR under lost-comm procedures.
- Use the satellite phone or dispatch to relay position and intentions to ATC.
- Keep the still-working EMS radio for medical traffic so you do not dump a STEMI update onto a crowded tower frequency.
- If both external radios fail, write essential data on a glove or notepad and use ICS hand signals already briefed; do not shout over the rotor.
Privacy, Recorded Lines, and Helmet Technique
Dispatch lines and many EMS channels are recorded and discoverable. HIPAA does not forbid a treatment handoff, but it expects minimum necessary identifiers on an unencrypted channel. Use age, sex, and a problem list on the radio; save full name and date of birth for the recorded dispatch line or the bedside report.
The ICS is not an external radio. Check the ICS/radio selector before you speak; a hot-mic or a wrong selector can put a private conversation on the county net.
Helmet boom-mic and equipment failure
Place the mic almost on the lips, slightly off-axis. Pause a half-second after keying, speak across the mic rather than into it, and unkey as soon as you finish — a stuck microphone blocks the entire net. If the boom fails, fall back to a handheld on ICS, then to written notes passed to the PIC, then to the satellite phone. Equipment failure is a reason to use the next path you already briefed.
On short final to a rooftop helipad, the referring hospital keys the EMS radio to add that the patient has an allergy to hydromorphone. The aircraft is in a hover over the pad. What should the flight nurse do?
While in instrument meteorological conditions, the flight nurse needs an online order for a rapid-sequence intubation induction dose. Which communication practice is most appropriate?
The aviation very-high-frequency radio fails in cruise on an instrument flight rules mission. The EMS radio and satellite phone still work. What is the best next step?