ENR 5.3 [RESERVED]
Federal Aviation Administration Twentieth Edition
ENR 5.4 [RESERVED]
Federal Aviation Administration Twentieth Edition
ENR 5.5 [RESERVED]
Federal Aviation Administration Twentieth Edition
ENR 5.6 Bird Migration and Areas
With Sensitive Fauna
1. Migratory Bird Activity
1.1 Bird strike risk increases because of bird migration during the months of March through April and August through November.
1.2 The altitudes of migrating birds vary with winds aloft, weather fronts, terrain elevations, cloud conditions, and other environmental variables. While over 90 percent of the reported bird strikes occur at or below 3,000 feet AGL, strikes at higher altitudes are common during migration. Ducks and geese are frequently observed up to 7,000 feet AGL and pilots are cautioned to minimize en route flying at lower altitudes during migration.
1.3
Considered the greatest potential hazard to aircraft because of their size, abundance, or habit of flying in dense flocks are gulls, waterfowl, vultures, hawks, owls, egrets, blackbirds, and starlings. Four major migratory flyways exist in the U.S. The Atlantic Flyway parallels the Atlantic coast, the Mississippi Flyway stretches from Canada through the Great Lakes and follows the Mississippi River. The Central Flyway represents a broad area east of the Rockies, stretching from Canada through Central America. The Pacific Flyway follows the west coast and overflies major parts of Washington, Oregon, and California. There are also numerous smaller flyways which cross these major north.south migratory routes.
2.
Reducing Bird Strike Risks
2.1 The most serious strikes are those involving ingestion into an engine (turboprop and turbine jet engines) or windshield strikes. These strikes can result in emergency situations requiring prompt action by the pilot.
2.2 Engine ingestions may result in sudden loss of power or engine failure. Review engine out procedures, especially when operating from airports with known bird hazards or when operating near high bird concentrations.
2.3 Windshield strikes have resulted in pilots experiencing confusion, disorientation, loss of communications, and aircraft control problems. Pilots are encouraged to review their emergency procedures before flying in these areas.
2.4 When encountering birds en route, climb to avoid collision because birds in flocks generally distribute themselves downward, with lead birds being at the highest altitude.
2.5
Avoid overflight of known areas of bird concentration and flying low altitudes during bird migration. Charted wildlife refuges and other natural areas contain unusually high local concentration of birds which may create a hazard to aircraft.
3.
Reporting Bird Strikes
3.1
Pilots are urged to report any bird or other wildlife strike using FAA Form 5200.7, Bird/Other Wildlife Strike Report (FIG ENR 5.6.1). Forms are available at any FSS or any FAA Regional Office. Wildlife strikes can also be reported electronically at: http://wildlife.mitigation.tc.faa.gov. The data de-rived from these reports are used to develop standards to cope with this potential hazard to aircraft and for documentation of necessary habitat control on airports.
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