What happened
On August 13, 2016, a Cessna 172 (registration F-HDKY) departed from runway 26 at Lognes Aerodrome for a flight to Châlons-Vatry. During the initial climb, at an altitude of approximately 200 feet, the pilot identified a large flock of birds directly in the flight path. Despite attempts to maneuver, the aircraft struck several dozen birds. The impact affected multiple areas of the aircraft, including the propeller and the right wing.
Following the collision, the pilot checked for engine vibrations; finding none, the pilot declared an emergency. The pilot then performed a low-altitude circuit and landed the aircraft safely without further incident. The aircraft sustained heavy damage, including significant denting to the leading edge of the right wing, damage to the trailing edge rib, and blood and feathers found on the windshield, propeller, and vertical stabilizer.
The investigation
The BEA investigation examined the environmental risks at Lognates Aerodrome and the effectiveness of bird dispersal measures. The investigation noted that the airfield is bordered by ponds and wooded areas, which attract bird populations. While the airfield's aeronautical information service (VAC) listed "NIL" for bird hazard management, the investigation found that bird dispersal services are available occasionally upon request during weekday business hours, though they are not permanently stationed at the site.
Investigators also reviewed the reporting of bird strike events. It was noted that while pilots are required to submit safety reports (CRESAG), there were discrepancies between official statistics and pilot testimonies regarding the frequency of such events. The investigation also looked into the timing of the event, noting that the collision occurred during a period of the year and a time of day when bird strike risks are statistically at their highest.
Findings
- The collision occurred within the airfield's operational volume and during a period when active bird dispersal measures were not in effect.
- The strike happened during a time of day and season when the risk of bird collision is at its peak.
- The pilot identified the flock but was unable to avoid the impact due to the large number of birds and the short reaction time available.
- The lack of clear information regarding the availability of occasional bird dispersal services means pilots do not proactively request these services to mitigate risk.
- Inconsistencies between official records and pilot reports highlight a need for more systematic reporting of bird strike events to allow airfield operators to manage risks effectively.