4.4 Pre-Mission Preparation and Risk Assessment

The safest landing is the one you never take with a sick crew, a broken ventilator, and a night unaided scene in icing. Pre-mission preparation is how the flight nurse turns a request into a go or a no-go before anyone walks to the aircraft.

IM SAFE: the crew is part of the machine

Use IM SAFE at the start of shift and again when a request comes in at 0300:

• Illness — fever, vertigo, a gastrointestinal bug, or a cold that will not clear in a helmet.
• Medication — anything that sedates or is not already disclosed to the program's medical officer.
• Stress — a bad outcome yesterday or a fight at home. Stress narrows attention.
• Alcohol — program policy is usually stricter than a casual "eight hours bottle to throttle." If you would not want the other nurse smelling it, you are not safe.
• Fatigue — duty time, a second job, a sick child. Fatigue looks like competence until the hover.
• Emotion / Eating — rage, grief, hypoglycemia, or a shift started on coffee alone.

If any letter is red, you are a no-go until it is mitigated or you are replaced. A "we're short-staffed" request is external pressure, not a reason to fly sick.

PAVE, TEAM, and AMRM

Two complementary pictures help the crew talk about risk before ego does. PAVE — the FAA four-pillar tool — asks four questions:

Threat and Error Management (TEAM) — the conceptual Air Medical Resource Management (AMRM) partner to PAVE — asks the crew to name threats before they become errors: night, unaided, scene, fatigue, a heavy patient, a short fuel plan. Then trap the error (a wrong pad identifier, a missed NOTAM) before it becomes an undesired aircraft state.

AMRM makes go/no-go a crew product. Any member can stop the launch. That is the job, not insubordination.

Weather the nurse must be able to discuss

You are not the PIC and you do not approve an instrument flight rules (IFR) clearance. You do have to recognize weather that stacks risk:

• Ceiling and visibility versus program visual flight rules (VFR) minimums, day versus night.
• Icing — if the aircraft is not certified and equipped, visible moisture plus freezing temperatures is a no-go.
• Thunderstorms — do not launch under or through. Turbulence, hail, and lightning are not "ten more minutes."
• Night unaided versus NVG-aided. Night plus scene plus unaided is a different flight than a lit hospital pad on IFR.

Weather walk-away rights mean you can decline without a committee. If the PIC wants to go and you do not, say the specific threat: "night unaided scene, ceiling at minimums, I am a no-go."

Aircraft, MEL, and the nurse's stop switch

Airworthiness and the MEL are PIC and maintenance domains. The nurse still looks: obvious damage, a fuel leak, an inoperative hoist you were told you would need, a cabin door that will not latch. An MEL may legally allow a flight without a hoist. It does not make a canyon hoist-rescue the right mission. If the aircraft is not safe for this request, stop the launch.

The crew briefing

A usable briefing is short and specific:

• Destination, routing, and fuel plan — including a weather divert.
• Patient weight, extra equipment, extra rider, and weight-and-balance (the PIC computes; you supply honest numbers).
• Sterile cockpit: takeoff, landing, hover, confined area, instrument approach.
• Emergency egress, ditching if over water, ELT and extinguisher locations.
• Who talks to whom: aviation radio is PIC; you own medical traffic after the aircraft is stable.

A bariatric patient plus a blood cooler plus a third clinician plus a ventilator can put a light helicopter out of limits. Say the weights out loud.

Equipment, drugs, and the launch checklist

Before you accept the mission, the cabin has to be able to treat the patient you were promised:

• Ventilator that functions on aircraft power and battery, with a bag-valve backup.
• Monitor with working end-tidal carbon dioxide, saturation, and enough cables.
• Pumps with charged batteries and a backup infusion plan.
• Blood cooler actually cold, products checked if they fly with you.
• Airway bag with working suction, a backup laryngoscope, and a cricothyrotomy kit.
• Ultrasound if your program flies it — charged, and findable in the dark.

Controlled substances are counted at shift start, at handoff, and when a seal is broken. A missing vial is a stop-and-account event.

Risk stacks

Treat risk as additive, not as a vibe.

• Night unaided + scene + mountainous or wires = the highest common HEMS stack.
• Night NVG + scene is better than unaided and is still not a hospital pad.
• IFR interfacility to a published, lit approach is usually the most structured stack — and still a no-go if icing, thunderstorms, or fatigue is red.
• Day VFR interfacility to a familiar pad is the lowest common stack, and crews still crash on it when they skip the brief.

If two or three boxes are already amber, the next add — extra crew, heavy patient, short fuel — is how amber becomes a wreck. Walk away while the aircraft is still in the hangar.