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'Overwhelmed' air controller caused four incidents

Publish Date
Thu, 4 Oct 2018, 10:36AM
The control tower at Hamilton Airport.
The control tower at Hamilton Airport.

'Overwhelmed' air controller caused four incidents

Publish Date
Thu, 4 Oct 2018, 10:36AM

An air traffic control assessor had to take over an Airways control tower at Hamilton when a controller became overwhelmed, leading to four incidents.

A Transport Accident Investigation Commission report finds ''the controller became overwhelmed by the circumstances on the day and lost situational awareness of the aircraft within the control zone".

The report says an aerodrome controller was undergoing an annual proficiency assessment in the Hamilton air traffic control tower on December 17, 2015 with an 

assessor sitting behind.

During the assessment, a series of four incidents occurred that related to the controller's management of air traffic in the vicinity of the aerodrome.

An initial report stated two light planes involved in training came within 0.2 nautical miles (370m) of each other while on approach to the aerodrome before taking avoiding action to avoid a potential collision.

''Following the fourth incident, the assessor stopped the assessment and took over as the aerodrome controller to resolve the situation,'' the report out today says.

There were no collisions and nobody was injured.

The commission hired a clinical psychologist to analyse the controller's actions.

''The psychologist's assessment of the controller's actions stated in part [that] the controller appears to have experienced 'choking under pressure', a phenomenon defined as a critical deterioration in the execution of habitual processes as a result of elevation in anxiety under perceived pressure, leading to substandard performance."

The commission also found that the usual briefing procedure before conducting the assessment was not fully followed, and that this likely affected the team dynamics in the control tower.

At a broader level the commission found that Airways' tradition of posting recently qualified controllers with limited experience to Hamilton aerodrome, one of the busiest in the country, had the potential to raise the risk profile of the air traffic control unit.

The commission identified the following safety issues:

• the standard of team resource management in the Hamilton air traffic control tower did not match good industry practice

• some aerodrome controllers are "over-controlling" visual flight rules traffic in and around the control zone, which is unnecessarily congesting the radio frequencies and risks causing difficulties for inexperienced pilots and those for whom English is their second language.

The commission also said changes in the size and shape of the Hamilton control zone have shifted some visual flight rules with traffic congestion to prominent points outside the control zone, and likely increased the risk of collision in those areas.

The commission made two recommendations to address key safety issues.

The key lessons arising from the inquiry were:

• operational assessments in a team situation have the potential to alter the normal team dynamics. It is essential that assessments are properly managed and that every team member is clear on their responsibilities and their involvement in the assessment process

• clear, succinct and short radio communication between air traffic control and aircraft is pivotal to safe operations.

Comment was being sought from Airways.

The report comes out a week after Airways had to apologise for problems with an air traffic controller turning up late for work at Hawke's Bay Airport and delaying aircraft. It was also revealed that in August police were called to evict a woman from the air traffic control tower after she became enraged at her husband - the duty controller.

At Hamilton there are training schools on the aerodrome and the airport is getting busier.

Last year it reported a surge in passenger numbers, boosted by people avoiding congested Auckland roads to get to the airport in that city.

Hamilton Airport experienced a 13 per cent increase in passengers across core routes (Wellington, Christchurch, Palmerston North) during 2017 with close to 335,000 air travellers going through the gate.

Waikato Regional Airport Ltd (WRAL), owned by five Waikato-based councils, owns Hamilton Airport. Hamilton & Waikato Tourism and Titanium Park Ltd are also WRAL subsidiaries.

Increased seating capacity had also played a role in the growth, he said. Hamilton Airport has seen a 12 per cent increase in available seats after Air New Zealand phased out its 19-seater Beech aircraft in August last year, replacing them with 68 and 50-seater planes.

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