Otago Daily Times

Air force bases have highest bird strike risk

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WELLINGTON: Two of New Zealand’s three air force bases have the country’s highest risk profiles for bird strikes on aircraft.

Data collated by the Civil Aviation Authority showed that Woodbourne in Marlboroug­h and Whenuapai, northwest of Auckland, had upward risk and incident rates of aircraft hitting birds.

A larger bird hitting a plane could cause significan­t damage.

The risk profiles of Invercargi­ll and Palmerston North airports were also increasing.

CAA certificat­ion team leader Rob Buchanan said nationwide it was an ongoing risk, but one that was well managed among all involved, including pilots.

The authority had recently updated its Good Aviation Practice guideline, which included material on bird strikes and how best to avoid them.

Mr Buchanan said an emerging problem had been the advent of quieter, more fueleffici­ent jet engines, which birds were less likely to hear, but pilots took this into account during descent.

‘‘One of the mitigation­s we use is that we [pilots] all slow down below 10,000 feet, where birds are more likely.

‘‘The chance for a bird to get out of your way is much greater, and if by any chance there was a bird strike then the damage is a lot less.’’

It was not clear why the two defence force airfields were trending up in the risk and incident categories, Mr

Buchanan said.

The CAA was not involved in regulating those aerodromes.

‘‘Each manages the risks themselves, and importantl­y they manage the statistics themselves.

‘‘We do the same thing for all certificat­ed aerodromes across New Zealand that are used by public flights, so we’re aware of when bird numbers are increasing, when near misses are occurring, the time of the year, location, the height and which aeroplanes are most affected.’’

It was possible the defence force had a different way of measuring the statistics, he said.

RNZ approached the defence force for comment several times, but has not received a response.

Mr Buchanan said there were times of the year when bird strike presented more risk to aircraft, and to birds.

The risk from migratory bird patterns increased at certain times of the year, including inbound in springtime and outbound in autumn.

‘‘At this time of year in spring birds are simply moving around a lot more, making nests and gathering food.’’

It was something most pilots were aware of, Mr Buchanan said.

The Civil Aviation Authority said on Friday that helicopter, fixedwing aircraft and microlight pilots flying over Mangawhai, north of Auckland, were jeopardisi­ng a tiny population of the country’s rarest bird, the New Zealand fairy tern.

It had informatio­n that throughout much of October, 31 aircraft had breached newly establishe­d restricted airspace over a wildlife refuge at Mangawhai Spit, directly north of the Tara Iti golf course.

The spit was the main breeding ground for the birds, whose population of about 40 was close to a quarter of the country’s total population.

The birds regarded passing and lowflying aircraft as predators, and would potentiall­y abandon their nest.

Whangarei Department of Conservati­on biodiversi­ty ranger Ayla Wiles said it was important pilots observed the restricted airspace rule, to help prevent the extinction of what was possibly New Zealand’s most endangered indigenous breeding bird.

‘‘Pilots who ignore the restrictio­n are not only in breach of civil aviation rules, but potentiall­y also breaching the Wildlife Act,’’ she said.

Doc officers were now recording registrati­on marks of aircraft in breach of the rule. — RNZ

❛ At this time of year in spring birds are simply moving around a lot more, making nests and gathering

food

 ?? PHOTO: PHILLIP CAPPER ?? RNZAF Base Woodbourne.
PHOTO: PHILLIP CAPPER RNZAF Base Woodbourne.

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