Why you shouldn't freak out if your plane loses an engine

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Both planes landed safely, but the five passengers on the Delta flight were injured during the evacuation.
Engine malfunctions are increasingly rare these days but do still occur.
Modern twin-engine airliners are designed to fly hours on end using a single engine.

On Tuesday, a United Airlines Boeing 777 landed in Honolulu missing the cowling or cover on the front one of its engines.

United Airlines won't confirm whether the incident rendered the engine operable, but images of the engine after landing in Hawaii along with passenger statements of severe vibrations would indicate it was likely shut down by the flight crew.

Later on Tuesday, a Delta Air Lines Airbus A330 made an emergency landing shortly after taking off from Lagos, Nigeria due to a problem with one of its engines. Five passengers suffered "non-critical" injuries while evacuating the plane from emergency slides.

According to Flightglobal, the United Boeing 777 and the Delta Airbus A330 were powered by different versions of Pratt & Whitney's PW4000 turbofan engine.

Pratt & Whitney was not immediately available for comment on the matter.

Also, it is too early in the investigation to tell what caused the two incidents.

Fortunately for the passengers and crew, both twin-engined airliners involved are designed to fly for substantial amounts of time on a single engine.

Should I be worried?

So, should you be worried when an airliner loses an engine?

In rare and extreme instances, a failure can cause damage beyond the engine casing.

Last October, Air France Flight 66 suffered one of these uncontained engine failures on a flight from Paris to Los Angeles. One of the Airbus A380's four engines malfunctioned causing the fan blade and the entire front of the unit to sheer off mid-flight. Fortunately, the plane was able to land safely in Canada.

In such cases, the big worry centers around the extent of the damage to the plane caused by flying debris from the engine. It is unclear how much damage the failure did to the aircraft beyond on the engine, but the plane was able to be flown back to Paris a few weeks later.

But there have been documented incidents where an engine failure has caused severe damage to the aircraft.

In November 2010, another Airbus A380, Qantas Flight 32, suffered a catastrophic uncontained engine failure caused by a leaking oil feed pipe. Flight 32 was able to make a safe landing even though the aircraft suffered significant structural damage and damage to several important flight management systems.

It should be noted that the Qantas A380 and the Air France A380 are powered by engines from two separate manufacturers with fundamentally different design philosophies.

The Air France aircraft reportedly involved in the incident, F-HPJE is a seven-year-old Airbus A380 powered by four Engine Alliance GP7200 turbofan engines. Engine Alliance is a Connecticut-based joint venture between Pratt & Whitney and General Electric. While the Qantas Flight 32 was powered by four Rolls-Royce Trent 900 engines.

The take away here is that even in the most severe instances of engine failure from recent memory, the airplane and its crew have been able to bring its precious cargo of passengers to safety.

While the loud noises and jarring vibrations may be distressing, it likely feels far worse than it actually is.

One engine? No problem.

Long-distance and transoceanic flights have traditionally been flown by three- or four-engine wide-body airliners. This is because when it comes to the engine count on an airliner, aviation thinking dictates that there is safety in numbers.

Why you shouldn't freak out if your plane loses an engine

Should I be worried?

One engine? No problem.

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