Flight QZ8501: 5 things that could have gone wrong

Flight QZ8501: 5 things that could have gone wrong

It is not an exact science.

That is how Australian airline pilot Mark Tonta describes flying into tropical storms.

 

Mr Tonta, who flies private planes, said radar is used to avoid the storms "to the best of our ability".

"But the equipment we have on board for weather avoidance cannot tell the exact height of storm clouds. Only experience helps you to form a plan of track change and level change," he said.

Although the reasons for AirAsia Flight QZ8501 going missing yesterday are still unclear, Indonesian authorities said the plane had been flying at 32,000 feet and the pilot had asked to fly at 38,000 feet to avoid clouds.

Mr Tonta felt that to fly into a fully active large storm that is near 52,000 feet could be "from poor decisions made for a number of reasons, even technical problems such as radar failure".

BREAK UP

"Entry into this sort of storm could cause the aircraft to break up in flight for sure," he said, adding that a lack of distress call could also be because of the extreme conditions on board such as violent turbulence.

A former pilot, who declined to be named, said he would usually try not to fly into a storm if possible.

"But if I have to then, I would make sure everyone is strapped in before selecting the recommended penetration speed to do so," he said.

He recalled a flight from Kuala Lumpur to Singapore which encountered a storm that caused the whole aircraft to shake violently.

"I had the autopilot on, but because of the violent vibration, I was guarding it closely and ready to take over should it trip ... Since that experience, I have learnt to respect the force of nature," he recounted.

Mr Tonta said pilots should never make a choice if there is no Plan B.

"Sometimes it's hard to see on radar past the storm just in front ... so you always keep an option that is safe. Maybe you burn more fuel or have to divert to another airport but always have a plan B," he said.

1. HIGH SPEED OR LOW SPEED STALL

Sufficient airspeed must be maintained in flight to produce enough lift to support the airplane. At a specific angle, air going over a wing will separate from the wing, causing the wing to lose its lift (stall).

2. AIRCRAFT ICING

If present on pitot static tubes, which are used to measure pressure, this can cause instrument errors.

3. PENETRATION SPEED

The faster the plane strikes an up draft or down draft, the greater the shock.

4. LIGHTNING STRIKE

This can cause electrical surge or damage to the instruments. For instance, a lightning strike can turn coloured computers and flight instruments to monochrome.

5. HUMAN ERROR

When the pilot's decision may not be the right one.

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