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Captain facing family and relationship problems before plane disappeared.
The captain of Flight 370 was in no state of mind to fly the day it disappeared and could have taken the Boeing 777 for a "last joyride" before crashing into the Indian Ocean, a fellow pilot says.
Captain Zaharie Ahmad Shah's world was crumbling, said the long-time associate. He had been facing serious family problems, including separation from his wife and relationship problems with another woman he was seeing.
The man, who spoke to the Herald on condition of anonymity, said Captain Zaharie was "terribly upset" when his wife told him she was leaving and believed he may have decided to take the Malaysia Airlines plane to a part of the world he had never flown in.
Malaysian Prime Minister Najib Razak said data showed the plane, carrying 239 people, crashed into the southern Indian Ocean about 2500km west of Perth on March 8, eight hours after leaving Kuala Lumpur.
With no landing sites nearby, the jetliner is presumed lost with no survivors.
Search likely to resume today
Blustery conditions in the southern Indian Ocean are expected to ease today allowing authorities to resume the search for the jet.
Gale force winds and heavy swells disrupted search and recovery efforts yesterday.
RNZAF Air Commodore Mike Yardley told TVNZ's Breakfast that the forecast is for improving search conditions.
"We're confident we will be out there and we'll be able to conduct a very good visual and radar search,'' he said.
The confirmation the plane went down in the southern Indian Ocean has helped to motivate the crew, he said.
Malaysia's Prime Minister Najib Razak , left, and acting transport minister Hishammuddin Hussein. Photo / AP
"The intention is to swap the crew out on Friday which we're an anticipating will be another rest day. So two days left for these guys, and that will just about make it three weeks [of searching] for them,'' Mr Yardley said.
Image 1 of 43: Christchurch man Paul Weeks who is thought to be on Malaysian airlines flight MH370 which is currently missing, presumed crashed. https://www.facebook.com/danica.weeks Sourced from Danica Weeks open Facebook page
The friend said Captain Zaharie, who he chatted to when they met several times a year through work, was a fanatic for "the three Fs" - food, family and flying.
When he wasn't working he spent hours cooking or using his home-made flight simulator for a variety of situations he wouldn't experience at the controls of a commercial airline, such as flying at the highest and lowest possible altitudes.
The simulator was seized last week and is being analysed by the FBI.
Investigations so far found that, up to the point when the co-pilot said "all right, good night" to Malaysian traffic controllers, the plane had been flying normally. Military radar tracking showed the aircraft made a sharp turn soon after and started flying at altitudes as high as 45,000ft (13,716m) and as low as 12,000ft before it disappeared.
The associate believed the co-pilot must have been incapacitated and the other flight crew kept out of the cockpit.
"It is very possible that neither the passengers nor the other crew on-board knew what was happening until it was too late."
A relative of one of the Chinese passengers aboard the Malaysia Airlines jet MH370 grieves. Photo / AP
The friend said the disappearance of the Boeing 777 happened as Captain Zaharie's world was crumbling.
"He's one of the finest pilots around and I'm no medical expert, but with all that was happening in his life Zaharie was probably in no state of mind to be flying."
Inquiry source: Crash 'deliberate act'
Sources close to the inquiry were quoted by Britain's Daily Telegraph as saying investigators believed Flight 370 was crashed deliberately.
"This has been a deliberate act by someone on-board who had to have the detailed knowledge to do what was done," an official source said.
Investigators believe no malfunction or on-board fire was capable of causing the aircraft's unusual flight or the disabling of its communications system, or of taking it on a seven-hour flight wildly off course.
New Zealand aviation expert Peter Clark said he believed Captain Zaharie may have been responsible.
"This had to be a pilot or somebody with expert knowledge, who had to know what they were doing to complete this," Mr Clark said.
"It had to be somebody with immense knowledge ... the co-pilot would not have the capability of doing this. It's a takeover of the aircraft, it can only be the pilot."
He said Mr Fariq was "too inexperienced" to carry out the takeover - it was his first flight as co-pilot without a third pilot in the cockpit overseeing him.
Mr Clark said it would have been very simple for the pilot to reprogramme the flight management computer to fly a new course.
"All you need to do is fly it to high altitude, de-pressurise the aircraft, you kill everybody on-board including yourself and you have the flight management programmed in and it just continues to fly to the South Indian Ocean until it runs out of fuel."
But Mr Clark said it would be very hard to prove it was pilot suicide even if the data recorders were found.