Business
When animal meets airplane
It can be deadly; AZ airports look at cutting danger
By Enric Volante
Arizona Daily Star
Tucson, Arizona | Published: 06.21.2009

Propelled by January’s crash of an Airbus A320 airliner into New York’s Hudson River, Arizona’s commercial airports are taking a new look at how to reduce the hazard to aircraft of birds and other animals.
Consultants say they are likely to recommend that Tucson and Phoenix Sky Harbor international airports take additional steps to keep wildlife away.
In Tucson that could involve gradually paving more of the remaining pockets of desert land at airports. Another measure being discussed is training security workers to recognize not only where human intruders might slip through fencing, but coyotes and javelina as well.
The Federal Aviation Administration is requiring the environmental studies nationwide at commercial airports that experience bird strikes or have the potential to attract hazardous wildlife.
The risk is higher in states with more flocks of big migratory birds, such as Canada geese, but even in Arizona experts say wildlife is a significant hazard.
“One mourning dove can take out an engine on an F-16,” said David Bergman, state director of wildlife services for the U.S. Department of Agriculture. “For us here in the desert, a mourning dove is considered quite hazardous when you’re dealing with a single-engine aircraft.”
Over the past decade, FAA data on more than 1,350 wildlife strikes in Arizona, including 229 at Tucson International, show occasional close calls and injuries, and expensive damage. That’s only a glimpse: Reporting is not mandatory, and the FAA estimates 80 percent of wildlife collisions go unreported.
Last October at dusk, a military aircraft zoomed over the desert at 400 knots and collided with a black vulture. The aircraft, which was not identified in the FAA data, landed later at Tucson International, where mechanics found a damaged engine. The cost of repair: $52,028.
The cost was greater in June 2003 when an Air Force pilot flying near Gila Bend saw a turkey vulture disappear under the nose of his F-16 fighter. He heard a grinding noise and the engine lost thrust, says an Air Force accident report. Flame, sparks and smoke trailed from the plane as it struggled upward another 500 feet. Then the engine quit, the pilot bailed and the $20 million warplane plummeted to the ground.
A turkey vulture was again the unlucky bird when one hit the windshield of an F-16 as the fighter approached Tucson International in March 2006. Damage, if any, was less than $20,000.
As part of their ongoing wildlife programs, airport workers can clear vulture roosts and pick up animal carcasses to avoid attracting the big scavengers.
But vultures are sometimes drawn to airports by nothing more than the hot air rising from concrete and pavement. They like to soar into thermals and play.
“It’s hard to really plan for vultures. You never know where they’re going to show,” said Steve Fairaizl, a wildlife biologist with Airport Wildlife Consultants.
The Tucson Airport Authority traps and relocates birds, mainly doves and pigeons, as part of its wildlife management program. When flocks congregate at runways, workers harass them with pyrotechnics noise, essentially firing firecrackers from a flare gun, Fairaizl said.
The air guard, which shares runways with commercial airliners at Tucson, analyzes historical bird activity and scans the landing and takeoff areas with special radar designed to detect birds and guide avoidance tactics.
“If we know there are birds in an area, the higher you fly the less chance you have of encountering birds,” said Lt. Col. Doug Slocum, chief of safety for the guard’s 162nd Fighter Wing at Tucson International Airport.
Last year the fighter wing recorded five bird strikes, down from a high of 21 in 2006, Slocum said. Most years there has been some minor damage, meaning it cost the military less than $20,000 to fix.
The last reported damage to a commercial airliner at Tucson was in August 2002.
A Southwest Airlines Boeing 737 hit a dove on the climb out of Tucson, FAA data show. The pilot heard the impact, then noticed a vibration in one engine. The jet diverted to Phoenix and made a safe emergency landing. Inside the engine mechanics found six dented fan blades.
Two years earlier another commercial jetliner was climbing out of Tucson at dusk when something went wrong. The plane returned to the airport with the left engine shut down. Inside the engine mechanics found feathers and replaced three pairs of fan blades.
Aviation experts say they can’t just place mesh screens over the intakes of large jet engines. Ice could form and airflow could be reduced. Hit by a bird at high speed, a piece of screen could break off and cause more damage than the bird. Harden the overall engine to take hits from really big birds and weight becomes a problem. So airports take other safety measures.
In New York, officials recently said they plan to trap and kill up to 2,000 geese this year.
On Jan. 15, US Airways flight 1549 collided with Canada geese just minutes out of New York’s La Guardia International Airport. The bird strikes disabled both engines and the plane splashed down in the frigid Hudson River. The 155 passengers and crew survived.
That crash led the FAA to call for commercial airports to conduct new wildlife assessments, said Fairaizl of Airport Wildlife Consultants.
The firm is doing the studies for Tucson for about $65,000 and for Phoenix Sky Harbor for $85,000. Wildlife control is a significant cost of airport business, with many spending $100,000 a year and up. Denver, a major airport in an area rich with wildlife, spends about $300,000, he said.
So far the only larger birds seen in the ongoing assessment at Tucson have been ravens that appear in winter months.
“We aren’t really finding anything that’s causing a major hazard at the airport,” Fairaizl said. “So what’s going to come out of all this is an update of the current wildlife-management plan.”
Much of the airport is asphalt parking lots, noisy runways and concrete buildings. But Airport Wash snakes across the property, high with brush in some places. Southeast of Los Reales and Country Club roads lies a mesquite bosque. To the east the woods fade into shrubland cut with deep arroyos that stretch toward the city’s Los Reales Landfill, a source of food for birds.
Other potential wildlife attractants within a few miles of the airport are old sand and gravel pits and a few wetlands that attract ducks in the winter.
The strategy is to minimize food, shelter and water. Although the Tucson Airport Authority has had what Fairaizl called a good wildlife program for many years, consultants are likely to recommend that the authority pave over more desert during future construction projects, getting rid of mesquite trees and grasses, Fairaizl said.
In other areas, the airport may need to install additional plastic bird spikes to discourage perching. And although the airport patrols its fences daily, he said, those security workers may need to be trained about wildlife.
Coyotes and javelina have been known to slip in under the fences. In October 2007 a business pilot was making his takeoff run at night when his landing gear smacked a javelina. A big jetliner once hit a coyote. Neither plane was damaged. At Kingman the UHF antenna on a charter jet once struck a pronghorn, seriously damaging the fuselage and frame of the airplane.
The FAA data shows helicopters are among the most vulnerable aircraft.
Shortly before midnight in September 2005, a police pilot was flying an MD 520 helicopter 400 feet above Phoenix, the FAA data says. The helicopter hit and killed an American coot, shattering the left side of the windscreen and injuring the pilot, who made a precautionary landing at the Phoenix Coliseum. The damage estimate was $30,000. Since 1998, 18 other American coots have been reported dead near Sky Harbor runways.
In September 2007, a tour helicopter was sightseeing near Meadview in Northern Arizona when the pilot saw a large bird pass slightly below his plane. Suddenly another bird — a golden eagle with a wingspan of nearly 8 feet — appeared almost directly ahead and shattered the windshield.
“I was struck in the face, neck and arm by debris and/or parts of the bird,” the pilot reported. He landed safely, but he and two passengers had minor injuries.
Although bird strikes by aircraft are rare, federal regulators warn they are a worsening threat for the nation. Air travel has grown, more new planes have two engines instead of three or four and planes are quieter, making them harder for a bird to detect.
Contact reporter Enric Volante at 573-4129 or at evolante@azstarnet.com.