Plane Engine Failure: Why It Happens and What to Do

The engine sound changes, and your stomach drops. You glance at the gauges, and you already know what they’re about to say. 

You’re losing power and running out of time.

An engine failure is every pilot’s nightmare, but it’s also one of the most manageable emergencies if you act fast. And most times, whether you’ll be a cautionary tale or an industry legend gets decided in the first 10 seconds. 

Do you know what to do when your engine quits? Let’s talk about why airplane engine failure happens and how you can stack the odds of survival in your favor.

Key Takeaways

• Engine failures can happen due to mechanical, fuel-related, ignition, or human factors.
• Gauges and monitors, and even your own senses, can warn you of a potential engine failure. 
• Pitch for best glide speed, choose your landing site wisely, communicate, and follow your checklist.
• The “impossible turn” is possible, but it should only be your last resort.

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Why Airplane Engines Fail

You can do everything right in the cockpit and still lose power. Engines are machines, and machines can break in ugly, sudden ways.

Mechanical Causes

A cylinder can crack or fail in a way that makes one part of the engine stop pulling its weight. 

How does something like that even happen? The engine could be doomed from the start, like from improper manufacture. But wear-and-tear is also a likely cause that you can’t ignore.

A valve has to open and close on time, every time. A failed guide or other valve-related problem can turn smooth combustion into misfiring or partial power loss.

Then, there’s oil. It cools the engine, and it keeps metal parts from grinding themselves apart. Without it, oil starvation can happen. 

It can be from internal oil system problems or from damage that opens the crankcase.

Take for example, a connecting rod failure that punches through the case. It’s a violent event, but worse, it can snowball into rapid oil loss, then oil starvation.

Fuel-Related Causes

Fuel exhaustion means you ran out of usable fuel. Fuel starvation means the aircraft still has fuel on board, but it does not reach the engine in the right amount. 

These two problems are behind the majority of fuel-related accidents. An NTSB analysis found that fuel exhaustion alone accounted for 56% of fuel management accidents, with fuel starvation making up another 35%.

Fuel contamination is the other big problem. For example, water can enter the fuel system through leaks or condensation in partially filled tanks.

Induction & Ignition Problems

The engine can also lose power if it can’t breathe or if it can’t reliably ignite the mixture.

When moist air passes through a carburetor venturi, it cools. Ice can then form on the venturi walls and throttle plate.

That carb icing can restrict airflow to the engine. The ice, quite literally, chokes your engine to death.

But that’s why you have carburetor heat! It preheats the air to keep the fuel-air mixture above freezing. 

It can also melt ice that has already formed, as long as the buildup is not too severe. You can also use it as an alternate air source if the intake filter clogs, including in unexpected airframe icing.

Also, you might think a bad magneto simply means losing half your spark. 

Is that all it does? Sometimes, no. A faulty magneto can mess with ignition timing, which is way harder on the engine than you’d expect. Worst case, you end up with a detonating powerplant.

Human Factors & Maintenance

But a lot of engine failures don’t start in the engine itself. They start with normal human stuff: missed details, bad assumptions, rushed decisions, or maintenance work that didn’t go exactly right.

You can see it in the accident trends. Inadequate preflight preparation/planning and mismanagement of fuel are among the most frequent pilot causal factors in GA accidents.

Engine Failure Warning Signs

Gauges & Monitors

Engines don’t tend to just go AWOL. That is, your engine often gives you hints first. Gauges and engine monitors can’t predict the future, but they can show you trends that point to trouble.

You should check for proper oil pressure as soon as the engine is running smoothly. If it doesn’t rise to the manufacturer’s specified value, you should shut down immediately to prevent serious damage.

High oil temperature can signal cooling or lubrication issues, especially if it climbs steadily instead of stabilizing.

How can you detect carburetor icing? You might notice a drop in RPM in fixed-pitch propeller airplanes. For constant-speed propellers, you could see a drop in manifold pressure.

Sensory Cues

Your gauges can warn you, but your senses can warn you too. The first cue is often the sound. The engine might start sounding “uneven,” like it’s missing or struggling to stay smooth. 

You can also feel the vibration, and that one deserves your attention. Vibration can mean the engine is no longer running smoothly, or something mechanical is developing into a bigger failure.

Smoke-like odors, burning smells, or strong fumes can be early signs of an engine issue or something connected to the engine, like leaking oil.

Don’t feel, hear, or smell anything? Keep your eyes peeled for any smoke and fumes along with fluctuating engine indications.

Engine Failure: Immediate Actions

But despite all your best efforts, your engine can still quit when you least expect it. Whatever you do next can guarantee your survival, but only if you know the right steps to take.

Aviate: Pitch for Best Glide

First, how can you buy time? You need time to think, and speed control gives you just that. 

You should allow the airplane to slow until reaching best glide speed, then trim to hold that speed. But if you’re starting slower than your best glide speed, lower the nose immediately.

Best glide speed is the airspeed that gives you the most distance as you lose altitude. It’s basically your best shot at stretching every foot of altitude into usable range.

The exact best glide speed depends on the aircraft, so your primary source is always the POH/AFM. But generally, it sits roughly halfway between v_X and v_Y. 

That’s not a substitute for the published number, but it can give you a quick ballpark if you don’t have time to look it up.

Just keep in mind that the best glide speed increases with weight. Manufacturers often publish best glide at gross weight. So if you’re lighter than gross, your true best glide speed may be slightly lower.

Navigate: Choose a Landing Site

If you’re coming from a high altitude, you want to pick the general area first, then narrow it down as you get closer. 

How come? Terrain can look deceptively good from thousands of feet up, and you can burn a lot of altitude before you spot the true best option.

That’s why you shouldn’t feel locked into your first idea if something better shows up. Just try not to change your plan more than once.

What if you’re low and slow? Even a change in heading of just a few degrees can ensure a survivable crash. 

If you’re beyond gliding distance of a suitable open area, you should judge the available terrain for its energy-absorbing capability.

A controlled touchdown in rough terrain can beat an uncontrolled touchdown on a “perfect” field every time.

Communicate: Mayday & Transponder 7700

Your first priority is to fly the aircraft, but you should also talk early if you have the bandwidth. ATC can be a helpful extra pair of eyes and can get emergency response moving. 

You should also set your transponder to 7700 if you can’t get ATC right away, or if you need the emergency to be obvious on radar. 

ELTs commonly activate automatically on impact, but some situations call for manual activation. Modern 406 MHz ELTs can transmit your position data, which can help search and rescue.

Checklist Discipline

You don’t want to be flipping pages while the aircraft is descending, but you also don’t want to rely on memory for everything. The clean way to handle this is to separate memory items from written checklist items. 

Practice the “touch-then-verbalize” when you’re training for engine failures. 

How does that go? Physically touch the control, and say what you’re doing out loud. That slows you down just enough to stop mistakes, and it keeps your actions deliberate. 

Done correctly, and you may just be able to troubleshoot the issue successfully. 

But if all else fails, a casualty-free emergency landing also comes down to good checklist discipline.

Engine Failure Scenario Playbook

Engine Failure on Takeoff Roll

A serious problem on takeoff leaves you with one fundamental question: Can you stop on the runway you have left? 

If the answer is yes, you abort. A fire or a major power outage removes any debate. 

You should act immediately. Close the throttle first, then get on the brakes. Keep the airplane straight or steer toward the clearest path between obstacles. 

You pull the mixture to idle cut-off to shut off the fuel. Then, turn off the switches and get out of the airplane right away. 

If you lose thrust after liftoff, you might get the urge to keep pulling the yoke, and that would be a disastrous mistake. 

You should lower the nose immediately to the glide attitude. Then, pick a landing spot straight ahead in the windshield. 

Do you have time to ease into it? That depends on the airplane. Some designs demand a fast, assertive pitch change. Others carry enough momentum that a smoother adjustment works.

Airplane Engine Failure After Liftoff (“The Possible Turn”)

A low-altitude engine failure turnback, often called “the impossible turn”. Looks tempting, but it also stacks the odds against you. 

You deal with low altitude, high workload, and very little time to think. The FAA urges extreme caution. Advisory Circular AC 61-83J instructs flight instructors to teach trainees when and how to make a safe turnback, but only if altitude, best glide requirements, and pilot skill allow for a safe return.

What’s the right move? Don’t attempt a turnback unless you already know it will work. You should commit only if you can assure a successful return. In other words, it should only be your absolute last resort.

So, what if you’re all out of options? David Rogers of the US Naval Academy suggests starting with climbing at Vγmax, which is the speed that gives you the best angle of climb. That keeps you closer to the runway, which is the whole point if you’re considering a turnback. It should help you build as much altitude as possible before anything goes wrong.

You’ll glide through a heading change of about 190° to 220° to get lined up back toward the runway area.

The flight path is described as a teardrop shape. Carefully (very carefully) make a 45° bank, and keep the airplane flying at about 5% above stall speed in the turn. 

En-Route Cruise Failure

An engine failure in cruise gives you one big advantage: time. Altitude turns into options, but only if you cash it in immediately. 

You should establish best glide as soon as possible so you can maximize your gliding distance and buy yourself time to work the problem.

But if you’re more interested in staying in the air as long as possible, then minimum sink speed is what you’ll need. This speed is rarely found in the POH, but it will be a little slower than maximum glide range speed. 

Want a quick mental picture of your glide? For common trainers like the Cessna 152 and 172, you can expect about 1.5 nautical miles of glide distance for every 1,000 feet AGL. Higher-performance aircraft will do better. Check your POH.

After you’re pointed at a realistic landing option, you can troubleshoot. 

Cruise failures are often restartable if the cause is something simple, so you use your checklist flow and confirm the basics, like fuel selector position and ignition. 

Just don’t let troubleshooting steal your attention from flying the glide and protecting your landing setup.

Night or Over-Water Failures

An engine failure at night or over water feels different right away. You still win this the same way, though. You fly the airplane first.

Turn toward known terrain if it’s suitable for a forced landing. If you’re making a forced landing over water, also called ditching, aim for shallow water. This could be a beach or along a shipping lane to improve your chances of rescue.

Put on your life jacket, but do not inflate it just yet! Otherwise, it’ll block the exits during your evacuation. Only inflate life jackets once you’ve safely evacuated.

At night, plan to land in an unlit portion of your area. Why aim for the dark? Remember that your goal is to avoid obstacles and misleading depth perception around bright lights.

What if the landing light fails and you cannot see outside references? Hold a level landing attitude and let the airplane settle until you touch the ground.

Forced Landing Technique

Glide Geometry & Energy Management

A forced landing is really an energy problem. You start with a set amount of altitude, and you spend it to get to a touchdown point you can actually reach. 

Energy management means planning and controlling your altitude and airspeed based on your airplane’s energy state.

Final Seconds: Cabin Prep

Make sure to keep cabin prep simple and timed. You fly the approach first, and do cabin actions when the landing is assured.

If you have passengers, this is the moment to use short, direct instructions. You want belts tight, seats secure, and everyone braced and calm.

Touchdown & Post-Landing Actions

The biggest mistake you can make in an emergency landing is giving up control right at the end. You can pick a great spot and fly a solid approach, then still ruin it in the final seconds. That can be what leads you to disaster, even on perfect terrain.

Flat, open ground feels forgiving, but it still has traps. A nose-low touchdown can make the nose stick into the ground, which can flip the aircraft or cause a violent deceleration. 

You also want to avoid steep bank angles right before touchdown. Remember that the bank increases stall speed, and it raises the chance of a wingtip strike when you’re inches from the surface.

A high sink rate at touchdown can hurt you, even if the ground is wide open and perfectly flat. The cabin might stay intact, but your body still takes the load. 

So what’s the real goal here? You want the lowest vertical speed you can manage at the moment of impact. That gives you the best chance of walking away from the landing.

Multi-Engine & Jet Nuances

A single-engine failure on a multi-engine aircraft can be a different story. You’ll naturally want to shut down a sick engine to save it, but that instinct can backfire. 

What should you do? Keep the engine running if there’s any doubt you might need it to stay safe.

But of course, this isn’t a hard-and-fast rule, especially when the signs are loud and clear. Heavy vibration, smoke, blistering paint, or a big trail of oil points to a critical failure, and that’s a different situation. 

Instead, you should feather the affected engine, complete the engine securing checklist, and treat it like an actual emergency.

Then, divert to the nearest suitable airport and declare the emergency.

Fuel Crossfeed

Fuel crossfeed lets you feed fuel from one side of the aircraft to the engine on the other side. It’s mainly used for extended single-engine operation.

A nearby airport makes this simple, since you usually don’t need crossfeed if you can land soon. 

But a long single-engine flight changes the game. That’s when crossfeed can give the operating engine access to fuel that would otherwise be trapped on the wrong side. 

It can also help you manage fuel burn so you can keep your wings balanced.

Case Studies and Lessons Learned

Hudson A320 Dual Flameout (2009)

On the afternoon of January 15, 2009, US Airways Flight 1549 took off from LaGuardia Airport in New York City, headed for Charlotte. The aircraft was an Airbus A320, and it had only been in the air for about two minutes when a flock of birds struck the aircraft.

Both engines lost almost all thrust, which left the crew with very little time and very few good options. They ended up ditching in the Hudson River, about 8.5 miles from LaGuardia.

But miraculously, every single occupant survived.

In the middle of everything going wrong, what decisions saved everyone’s lives? 

The crew used effective crew resource management during the emergency. The aircraft also happened to be equipped for extended overwater operations, including forward slide/rafts, even though it did not have to be. 

The cabin crew moved quickly and helped make the evacuation happen smoothly. Emergency responders were also close by, and they reacted fast with the right kind of support.

GA Examples

In June 2016, a student pilot flying a Cessna 150L solo experienced a total loss of engine power after takeoff from Atlanta Regional Airport. But instead of turning back, she picked a golf course for the forced landing. 

She managed to touch down on a slightly rolling fairway lined with trees. The rollout was the problem. 

During the rollout, she hit a hill that launched the aircraft back into the air. A wingtip caught a tree, which spun the airplane around. When it came back down, it hit the nose and collapsed the front gear. 

But thankfully, the student pilot had barely a scratch.

What did she do right? She stayed in control and immediately committed to a forced landing. She protected airspeed and flew the aircraft all the way to the ground.

She also chose survivability over saving the airplane. The touchdown might have been hard, but the outcome proves her choices worked.

Common Myths and Misconceptions

“Engine failures are usually catastrophic.”

Engine failures certainly sound catastrophic, but the numbers tell us they’re usually not.

In general aviation, most accidents are non-fatal(for example, check out the NTSB’s Monthly Aviation dashboard, where roughly 80% of general aviation accidents over a recent five-year period were non-fatal).

Engine/powerplant issues are a common accident driver, but many power-loss events end in survivable forced landings when pilots fly the procedure and stay ahead of the airplane. 

What does this tell us? Engine failures are a lot less scary than they sound. If you know what to do and perform the procedures well, the odds of survival are well within your favor.

“You’ll stall if you bank 45° in glide.”

A 45° bank does not automatically mean you will stall. A stall happens when you exceed the critical angle of attack. Bank angle changes the load factor if you try to hold altitude.

Remember that stall speed increases with load factor, and it increases with the square root of that load factor. For example, an airplane that stalls at 50 knots in level flight will stall around 60 knots in a 45° bank while maintaining altitude.

You might be thinking, “But I’m not maintaining altitude in a glide.” That’s the point exactly. 

A gliding turn can still stall if you pull too hard, but the risk comes from yanking back pressure, not from the number “45” by itself. If you keep your control inputs deliberate, a 45° might just give you the best shot at surviving the impossible turn.

Conclusion

Engine failures are serious, but they don’t have to be the end of the story. You can stack the odds in your favor if you understand why they happen and how to spot them early.

Learn to react with a calm, disciplined flow. Remember this: best glide, best landing option, then checklist and communication.

Training builds habits you can trust when your heart rate spikes, and preparation cuts decision time. 

You can’t control every failure, but you can control how you respond to them.