Air Medical Operations and Safety

An air medical flight carries a patient and a trained crew by aircraft, from a scene or a hospital to definitive care. This page covers helicopter air ambulance (HAA) operations, regulated by the FAA under 14 CFR Part 135, and the interfacility and fixed-wing points that affect crew safety. Three groups need protecting: the crew, the landing zone (LZ) and the people on the ground. All three get managed before launch, at the LZ and in flight.

Scope and limits: you will find risk analysis, LZ and ground-crew hazards, radio, AMRM principles, EMTALA transfer rules and crew hazards here. Not here: post-crash survival or egress technique, structured patient handoff technique, in-flight drug dosing, or medical contraindications to flight. Patient-side altitude physiology lives on the Flight and Transport Physiology page.

Key Components

Flow Path

1. Request and risk analysis: the operator completes an FAA-approved preflight risk analysis before the flight (14 CFR 135.617).
2. Site check: the LZ is assessed against the operator's criteria. Unfamiliar or off-airport sites get airborne and ground reconnaissance.
3. Approach and briefing: the first helicopter contacts the ground unit when at least 10 NM from the LZ.
4. Landing and loading: the patient is loaded with the aircraft shut down or with rotors turning, under the rules for each.
5. Flight: the crew monitors the patient, weather and the aircraft. Radio contact continues on the multi-aircraft channel.
6. Handoff: at the receiving heliport, the crew states whether the patient will come off with rotors turning or stopped, and when.

The aircraft changes physiology for both the patient and the crew. Helicopter and fixed-wing flights differ, so know which aircraft you are in before you plan for it.

What It Does

What It Depends On

• Aircraft type: rotor-wing and fixed-wing flights differ in pressure, noise and landing constraints.
• Flight time and noise exposure: the crew study tracked both across duty days.
• Crew hearing protection: a helmet alone may not be enough.

Patient altitude physiology (gas laws, hypoxia, endotracheal cuff and pneumothorax changes, and tube and line management at altitude) lives on the Flight and Transport Physiology page. No pre-departure patient-securing checklist is set here. For that, use your transport protocol and that page.

The mission type decides how the aircraft lands or reaches the patient, and which hazards and limits come with it. The table names one common type per row, with its main limit.

Night Operations and Night Vision Goggles

• Pilot recency: flying with night vision goggles (NVG) needs NVG recency of flight experience under 14 CFR 61.57(f).
• Lighting: a night landing at an unimproved site needs enough light for the pilot to see the site and its hazards. If NVIS is in use, the lighting has to be compatible with the night vision imaging system (NVIS).
• Marking: pyrotechnic road hazard flares are not recommended for marking or lighting a landing site.
• Night networks: one 2026 Italian case flew a night mission to a municipal sports field. The field was one of about 20 lit sites found across the region, because hospitals had no nighttime landing sites of their own.

Indications

• Time-critical secondary transfer: the 2026 Italian expert consensus (expert opinion, not a guideline) finds HEMS most appropriate when cutting transfer time matters clinically and advanced in-transit care may help stabilize the patient.
• Conditions named in that consensus: acute coronary syndromes, stroke, traumatic injuries, aortic emergencies, cardiac tamponade, toxicological conditions and hyperbaric emergencies.
• Scene access: a suitable LZ within reach of the patient, or a hoist where no LZ exists.

Contraindications and Flight Limits

• Risk analysis: a green result may be accepted with no further action. A yellow result may be accepted only with mitigation, and the decision goes to the person in charge of operational control before the flight.
• Refused flights: the risk analysis has to include a way to check whether another HAA operator has turned the request down (14 CFR 135.617(a)(4)).
• Medical contraindications to flight: not covered here. Lean on your transport protocol and medical direction.

Key Evidence

Most of these rows are single studies, case reports or expert opinion. None of them is a guideline or a regulation. The NAEMSP position statement in the references covers physician oversight of air-based EMS.

Preflight Risk Analysis (14 CFR 135.617)

Weight and Balance

• Crew weights and carry-on medical equipment are actual weights, not estimates.
• Patient weights are asked for or estimated, not measured, for every aircraft size.
• An isolette or balloon pump that comes out and goes back in counts toward payload, the same as carry-on baggage.

Landing Zone Criteria

• Assess size, obstructions, lighting, surfaces, wires and wind direction before use, and keep the assessment current.
• Report unsatisfactory or dangerous LZ conditions through the operator's reporting system.
• The operator's criteria set the dimensions. Established heliports should meet the FAA heliport design guidance (AC 150/5390-2) as far as possible.

AMRM and Safety Culture

• AMRM: a moving process that brings pilots, medical staff, maintenance, operational support and management together, built on communication and team building (AC 135-14B para 1-6f; AC 00-64 covers training issues).
• Shared training: aviation and medical management should set safety responsibility and authority together. Then everyone can speak safely to each other (AC 135-14B para 4-10).
• Decisionmaking: training covers where to refuel, the terrain, weather changes, and when to change route or end the flight (AC 135-14B para 4-11).
• Just Culture: the AC calls it "justness." The organization reports its errors on its own initiative, holds staff and management to account, looks for systemic causes, and does not tolerate reckless behavior or willful disregard for procedures (AC 135-14B App. B, para B-2c(2)).

Your checks on the crew and the aircraft run through the whole mission, not only at the patient's side. Patient and lab monitoring fall under the transport protocol. Repeated lab checks, such as the lactate trend, are covered on the lactate page.

Crew Health

• Use hearing protection in the aircraft. In one prospective series, the crew without added protection had the largest threshold shift.
• Fatigue is one of the human factors the preflight analysis has to assess (14 CFR 135.617(a)(2)).

No anticoagulation targets are set on this page. A patient on heparin or another anticoagulant in transport needs the targets from the device or medication page, plus your transport protocol. Device circuits are covered on the ECMO page.

No doses appear on this page. Each medication page holds the dosing. Use it, and follow local protocols and medical direction. The cautions here are general, so check the medication page before you transport.

Most air medical problems start on the ground or on the radio, not in the air. The common ones sit at the top of the table.

Aircraft and ground events are covered below. Start with the aircraft's emergency checklist. A cardiac arrest on board runs under the team's arrest protocol, and this page gives no CPR settings.

Post-crash survival and egress technique are not taught here. The required medical crew briefing is where in-flight emergency, emergency landing and emergency evacuation procedures get covered (AC 135-14B para 4-4a).

This page does not wean a device. A patient transported on one needs the weaning guidance on that device's own page: ECMO, Impella or balloon pump.

Before You Move

1. Risk analysis: the preflight analysis is finished and covers LZ, fatigue and weather (14 CFR 135.617).
2. LZ and security: the LZ is assessed, and law enforcement or fire crews should secure the scene.
3. Weight and balance: crew and equipment weights are actual; patient weight is estimated.
4. Radio plan: the crew knows the 123.025 MHz channel and who it will contact.

Ground Crew Briefing

• Brief the LZ area: size, surface, hazards, obstacles and rotor wash.
• Use standard hand signals to position and park the helicopter.
• Know how to load and unload with the aircraft shut down, and with rotors running under the operator's procedure (tail rotor guard or lookout).

LZ Approach and Ground Hazards

• LZ area evaluation: size, surface, terrain suitability, hazards, obstacles and rotor wash (AC 135-14B para 4-7a).
• Visual cues: standard hand signals and communications position and park the helicopter (para 4-7b). The AC does not define a signal set, so use the operator's signals.
• Servicing vehicles: a trained person directs their approach and departure (para 3-13a(4)(g)).
• Night sites: lighting of night LZs and NVG discipline (para 4-7c).
• Shared heliports: aircraft announce whether the patient comes off with rotors turning or stopped, and the approximate time (para 3-9g(2)).

Interfacility Transfer Rules (EMTALA)

EMTALA (42 CFR 489.24) governs the transfer of a patient with an unstabilized emergency medical condition from a participating hospital. The transfer has to be appropriate, and one of three things must be in place. First, a written request from the patient or a representative, made after the patient has been told the risks and obligations. Second, a physician's signed certification that the medical benefits outweigh the increased risks. Third, if no physician is on site, a qualified medical person's certification made after consulting a physician. A hospital with specialized capabilities may not refuse an appropriate transfer when it has the capacity to treat the patient.

For the sending hospital, a transfer counts as appropriate only when four things hold. The hospital first treats the patient within its capacity to minimize risk. The receiving facility has space and qualified personnel and has agreed to accept. The sending hospital sends the available records. The transfer moves with qualified personnel and transport equipment, including the life support the patient needs in transit (42 CFR 489.24(e)(2)).

Air Medical and Altitude

• Transport-category airplane cabins are designed for no more than 8,000 ft cabin pressure altitude under normal operations (14 CFR 25.841(a)). Many air ambulance airplanes are not transport-category, so read this as a design reference. Patient altitude physiology lives on the Flight and Transport Physiology page.
• High-density-altitude LZs can cap performance. Reduce the load or pick a lower LZ, as the risk analysis allows.

Handoff

• State the off-load plan at a shared heliport: rotors turning or stopped, and the time.
• Before leaving a shared heliport, state position and intentions to other aircraft on 123.025 MHz.

Not covered here: structured handoff, such as a standard template, falls outside this page. Your transport protocol and the receiving team's requirements cover it.

Pediatric and Neonatal

The dose and size limits for children are not on this page. Work from the weight-based dosing and length-based tools: weight-based dosing and Broselow. Pediatric shock is covered at shock in children.

Pregnancy and Labor

For a woman in labor, the EMTALA transfer certification weighs the risks of transfer to both the woman and the unborn child (42 CFR 489.24(e)(1)(ii)(B)).

Systematic Walk-Through

1. Confirm the risk analysis and the reason for air transport.
2. Confirm the LZ is assessed, and the ground unit and security are in place.
3. Confirm the rotor state, and that the ground crew is briefed and positioned.
4. Confirm the radio channel, and state your position and intentions.
5. Confirm the off-load plan and time for the receiving heliport.

Pearls

• A helmet alone may not give enough hearing protection.
• Off-load the patient before refueling. If the patient must stay aboard, shut down the engines.
• The preflight analysis names fatigue and weather as risk factors.