A retired Air New Zealand pilot backs the reasoning and the decision of a Pacific Blue pilot to depart Queenstown Airport in a Boeing 737 in challenging conditions two years ago.
Frederick Douglas, who has more than 12,000 hours flying experience and 55 years in aviation, said the pilot facing charges of carelessness made a "logical and sensible analysis for departure".
A 54-year-old Pacific Blue pilot from Auckland, who has name suppression, has been charged with carelessly operating a Boeing 737, carrying 65 passengers and six crew, on June 22, 2010, when he left for Sydney after Pacific Blue's cut-off time of 5.14pm, or 30 minutes before the evening civil twilight of 5.45pm.
The defence argues the pilot's actions of leaving at 5.25pm, with a low cloud ceiling, on a wet runway and with crosswinds exceeding 16 knots, were below the level of carelessness.
Mr Douglas told Judge Kevin Phillips in the Queenstown District Court yesterday that he did not consider the pilot's departure on that day constituted a breach in the rules.
The witness accepted that the pilot had met Pacific Blue's required cloud ceiling limit of 1500ft and visual segment of 10km.
The crosswinds were not officially known to the court because the pilot had used his assessment of a windsock before take-off, something the prosecution has criticised.
The pilot had also used a Pacific Blue Boeing chart to calculate the aircraft's ability to reach the required 3600ft at tollgate 6, a key airspace marker, and Mr Douglas said this was something he also would have done.
"If I were in the position, I would have done the same thing. He cannot in my opinion be criticised for basing his calculations on it.
"It [his methodology] was conservative and it was cautious, it was reasonable and prudent."
Mr Douglas said the pilot, who has more than 16,000 hours flying experience, was best qualified to assess the weather conditions at the time and his eventual decision to depart was "correct".
"Even if the crosswind was above limitation, it would not have posed a risk, particularly in regard to the captain's experience.
"I am satisfied the pilot accurately identified issues in accordance with conditions and departed appropriately."
He said a cancellation of the flight would not have been a good decision, but ultimately this was up to the captain of the plane.
Mr Douglas had sat through the entire three and a-half week court hearing and concluded the captain had taken the safest option.
He said any diversion the pilot had taken on the departure, such as the lowering in altitude over the Kelvin Heights golf course were "legal, safe and simple".
The pilot had received cockpit warning of bank angle and "don't sink" at this very point of the departure.
