![]() The aircraft involved while still in operation with Child Flight | |
Accident | |
---|---|
Date | 3 May 2005 |
Summary | Pilot error |
Site | Stratford, New Zealand 39°19′29″S174°21′37″E / 39.32472°S 174.36028°E |
Aircraft | |
Aircraft type | Fairchild SA227-AC Metro III |
Operator | Airwork |
Registration | ZK-POA [1] |
Occupants | 2 |
Passengers | 0 |
Crew | 2 |
Fatalities | 2 |
Survivors | 0 |
Airwork Flight 23 was a New Zealand Post cargo flight between Auckland International Airport (AKL/NZAA) and Woodbourne Airport (BHE/NZWB) that disintegrated on 3 May 2005. [2] [3]
In command of the flight was 43-year-old Captain Clive Adamson, a relatively experienced pilot and line check captain with 6,500 total hours, nearly half of them on the Metroliner. Joining him was less experienced first officer, 41-year-old Anthony Drummond, who had 2,300 flying hours but only 70 on the Metroliner, which he had started flying earlier that year. No one else was on board, nor was there room, since the entire cabin was full of palletized mail.
The aircraft was scheduled for take off at 9:00 P.M. local time, but it was delayed while cargo was being loaded. During the delay the pilots ordered an extra 570 litres (130 imp gal; 150 US gal) of fuel and told the person refueling to put all the fuel in the left wing fuel tank, instead of splitting the fuel exactly between the two tanks, as was company procedure. The flight eventually took off at 9:36 P.M. local time.
Immediately after take off the autopilot was engaged and it controlled the aircraft during its climb to flight level 220 (approximately 22,000 feet (6,700 m). The flight was continued at full power instead of cruise setting to make up for lost time for the next fifteen minutes. On powering down to cruise power, the captain noticed imbalance between the fuel tanks and initiated cross flow procedures. Shortly after, at 10:13 P.M. local time, the plane entered a spiral descent and broke up, killing both pilots. [4]
The accident was investigated by the New Zealand Transport Accident Investigation Commission (TAIC). [5] It found that when the captain noted the fuel imbalance, he said, "We'll just open the cross flow again ... sit on left ball and trim it accordingly." He repeated the instruction five times in the next 19 seconds, to which the co-pilot replied, "I was being a bit cautious". The captain said, "Don't be cautious mate, it'll do it good". [5]
This resulted in the plane being flown at a large sideslip angle while still under autopilot control, by means of the rudder trim mechanism. Forty-seven seconds after the cross flow was opened, the captain said, "Doesn't like that one mate ... you'd better grab it." One second later they received a "bank angle" warning, followed by a warning chime that was presumably a warning they were straying from their correct altitude.
The investigation came to the conclusion that this was due to the autopilot disengaging, probably due to a servo reaching its torque limit. This meant that there was no compensation applied for the rudder trim input, and the plane entered a roll and steep descent, disintegrating around flight level 199. The investigation found poor visibility at night in low cloud was a factor in preventing the pilots realizing sooner.
The following improvements were implemented as a result:
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