The In-Flight Electrical Fire, the Smoke and Fume Elimination Checklist, and the Difference Between Landing as Soon as Possible and Landing Right Now

An in-flight electrical fire in a light aircraft has no fire alarm, no suppression system, and no annunciator light. What you have is a checklist, your training, and the altitude between you and the ground. Speed of recognition and speed of action are the entire ballgame.

How Do You Recognize an In-Flight Electrical Fire?

The first indicator is almost always smell - a hot, acrid, burning-plastic or burning-rubber odor. If you’ve ever had a small appliance fail at home, you know the smell. Your nose detects it before any smoke is visible. A wrong smell in the cockpit is your trigger to act. Do not wait for visual confirmation.

The second indicator is haze or smoke. A faint haze around the instrument panel or avionics stack is a warning. Visible smoke is a declaration. By the time smoke is visible, the situation has already developed - you are behind, but not out of options.

Sometimes the first clue is electrical: a circuit breaker that pops without obvious cause, avionics flickering, or a radio that drops out unexpectedly. The electrical system may be announcing a problem before you can smell it.

What’s the Difference Between an Electrical Fire, Engine Fire, and Cabin Fire?

These are three distinct emergencies with different recognition cues and different checklists.

An electrical fire originates in the wiring, avionics, or any device drawing current. There may be no obvious visual source at first - it announces itself through smell and haze. This is the most likely to involve flight-critical systems and the most likely to catch pilots off guard.

An engine fire originates in the engine compartment. You may see smoke coming through gaps in the cowling; the smell is more like burning oil or hot metal rather than burning plastic.

A cabin fire is something physically burning inside the cockpit - a charging cable, a bag, or seat material. Different source, different smell, different procedure.

What Does the In-Flight Electrical Fire Checklist Look Like?

The exact steps are in your aircraft’s POH emergency section, and you need to know them cold. The FAA Airplane Flying Handbook describes the following framework, which most light aircraft POHs follow:

1. Avionics master off. This isolates the avionics bus. Many POHs list this before the main master switch.
2. Master switch off. This interrupts power to the entire electrical system. Yes, this means losing panel-mounted radios, GPS, and electrically driven instruments. It still has to happen - you cannot fight a fire that is still being fed by current.
3. All electrical equipment off, one item at a time. If the smoke or smell stops at a specific item, you’ve identified the culprit. Leave that item off and potentially restore power to everything else, including a radio.
4. Master switch back on, carefully, to test whether smoke or smell returns. If the cockpit is clear, you may be able to restore partial electrical power and communicate normally.
5. Ventilate the cockpit fully. Open air vents. Crack a window if the aircraft allows it. Fresh air moving through the cabin clears smoke, helps you breathe, and helps you read instruments.
6. Declare the emergency, plan the landing, get on the ground.

Should You Reset a Tripped Circuit Breaker In Flight?

No - not unless it is absolutely necessary for the safe continuation of the flight, and then only once. This is current FAA guidance, and it supersedes the older advice of resetting breakers in flight.

A circuit breaker is a protection device, not a switch. When it trips, it detected an overcurrent condition and interrupted the circuit to prevent damage - or fire. If you reset it and it trips again, you’ve confirmed a fault on that circuit. If you reset it and it holds while something starts burning, you’ve overridden the only protection the system had.

On a practical test, if an evaluator simulates an electrical problem and you immediately reach for the circuit breaker panel to push the popped one back in, expect a detailed discussion. Know what the breaker was protecting. Know whether you need that system to continue the flight safely. Make a deliberate decision before you touch it.

Can Add-On Devices Start an Electrical Fire?

Yes. NTSB accident reports include in-flight smoke events traced directly to cockpit USB chargers, tablet mounts with built-in power connections, and aftermarket LED lighting. A 12-volt USB adapter drawing current from a cigarette lighter socket gets warm in normal operation and can become a heat source if it develops an internal fault.

Anything added to the aircraft’s electrical system is a load on that system, and anything can fail. If you plug something in, make sure it’s rated for aviation use and pulling appropriate current for the circuit it’s on.

How Can You Catch Electrical Problems Before Flight?

Pre-flight is where you get ahead of this. During your walkaround, note any burning smell or any wiring you can observe that looks degraded. Aircraft with high flight hours or those that have sat in harsh weather can develop insulation issues over time.

A pilot who smells something faintly wrong during pre-flight and mentions it to a mechanic has avoided something. A pilot who notices it and decides it’s probably nothing has not. Your A&P is watching for insulation issues during the annual - but you can notice them too.

What’s the Difference Between “Land as Soon as Possible” and “Land Immediately”?

These two FAA phrases are not interchangeable, and the distinction can determine the outcome.

“Land as soon as possible” means you have a serious developing emergency that warrants getting on the ground promptly at the nearest suitable airport. You still have time to identify a runway, communicate with controllers, and set up for a normal approach.

“Land immediately” (sometimes stated as “land as soon as practicable” in the most urgent sense, but operationally treated as “right now”) means the safest available surface visible from your current altitude - regardless of whether it has a runway, approach lights, or unicom. Continued flight carries more risk than landing in a field.

How Do You Decide Which Landing Urgency Applies to an Electrical Fire?

The answer depends on how the situation evolves after you’ve worked the checklist.

If you run the procedure, isolate the problem, clear the smoke, and the cockpit is stabilizing - you are in “land as soon as possible” territory. Declare the emergency, proceed to the nearest suitable airport, request the equipment, and land normally.

If the smoke continues to build after the checklist, if the haze is thickening, if you are having trouble reading instruments - the decision has been made for you. Land immediately. Find the best surface visible from your altitude, get the airplane on the ground, stop, and exit the aircraft. Do not taxi to the ramp. Stop on the runway and let emergency services come to you.

Pilots in actual emergencies consistently delay the “land immediately” call. The instinct is to reach a proper runway. The accident record shows that bias contributing to fatal outcomes. If the smoke is getting worse, not better, after you’ve worked the checklist, the decision is already behind you.

Why Is a Portable Handheld Radio Critical for This Emergency?

When the master switch goes off, your panel-mounted radios go with it. A portable handheld radio is not a luxury item on a cross-country flight. For an in-flight electrical fire specifically, it is a critical safety device.

Keep it charged before every flight. Keep it accessible in the cockpit during flight - not buried in a flight bag. Know the local approach and unicom frequencies before you leave the ramp. The scenario where this emergency ends well is one where the portable radio is already in reach when the master switch goes off.

What Should You Do This Week?

Read the in-flight fire section of your POH - know the steps, know the order, know which items are immediate action versus follow-on steps.

Brief yourself for 30 seconds before every flight: if I smell smoke, I go to the fire checklist. My nearest airports are [here] and [here]. My portable radio is charged and in reach.

Ask your instructor to walk through an in-flight fire scenario with you at altitude - verbally, without pulling actual switches. Talk through the steps, the landing decision, and where you would land if this happened on today’s specific route. The Airmen Certification Standards require demonstrated knowledge of this emergency. More importantly, this is how you remove the hesitation before it matters for real.

The FAA Airplane Flying Handbook chapter on emergency procedures and your aircraft’s POH emergency section are the two sources to work from.

Key Takeaways

• Smell is your earliest warning of an electrical fire - act on it before smoke is visible; do not wait for visual confirmation.
• Turning equipment off one item at a time can identify the source and allow partial electrical restoration, including radio communication.
• Do not reset a tripped circuit breaker unless absolutely necessary for safe flight continuation, and then only once - the breaker is protecting you.
• “Land as soon as possible” means nearest suitable airport; “land immediately” means the best visible surface right now, regardless of what it is.
• A portable handheld radio, kept charged and accessible, is a critical safety device for this specific emergency - not optional equipment.