Investigation Summary
The accident occurred during a scheduled regional flight to Aberdeen. The aircraft, G-OEAA, had been manufactured in 1980 and had a history of reliable service until the day of the accident. Shortly after departing Runway 14 at 17:47 local (16:47 UTC), the aircraft began to veer from its intended flight path. The weather was significantly degraded, characterized by low cloud bases (400 feet), restricted visibility (1,100 meters), and recent thunderstorm activity. One minute and 50 seconds after the start of the takeoff roll, while turning through a heading of 050 degrees and climbing through 1,740 feet, the First Officer radioed ATC reporting a problem with the artificial horizons and requested an immediate return to the airport. Investigation by the Air Accidents Investigation Branch (AAIB) focused on the two Attitude Direction Indicators (ADIs). At the time, UK regulations did not require a third standby artificial horizon for this aircraft type. The AAIB found that the Captain's ADI likely failed due to an electrical interruption or gyroscopic malfunction, providing erratic readings. Because the crew was in thick cloud, they had no external visual reference to verify which of the two primary instruments was correct. The resulting spatial disorientation led the crew to doubt the remaining functional instrument. The aircraft entered a series of erratic turns and a subsequent spiral dive. The aerodynamic forces during the high-speed descent exceeded the structural limits of the airframe, causing it to break apart before striking the ground six miles northeast of the airport.
Final Conclusions
The AAIB concluded that the primary cause was the failure of one or both artificial horizons, which led to a loss of control while flying in instrument meteorological conditions. The lack of a standby attitude indicator contributed to the crew's inability to resolve conflicting instrument data. The investigation noted that while a dual failure was statistically improbable (1 in a trillion), the failure of a single unit was sufficient to cause catastrophic disorientation in the prevailing weather. The aircraft suffered a partial structural failure during the dive before impacting Dunkeswick Moor.
Photographic Evidence (1)
Video Analysis
Pilots Flew Into The Worst Weather (Knight Air Flight 816) - DISASTER BREAKDOWN — An analysis of the 1995 Knight Air crash near Leeds Bradford Airport, examining how instrument failure and poor weather led to a fatal spiral dive.
If playback is blocked, the owner has disabled embedding — use the link above.
Airframe & Maintenance
Crew Experience
Captain
49-year-old male; gained ATPL in 1994.
First Officer
29-year-old male; had trained as a captain but was awaiting a vacancy.
Systems & Failure Modes
Artificial Horizon (Attitude Direction Indicator)
A gyroscopic instrument that displays the aircraft's pitch and roll relative to the horizon. The failure of this system in IMC conditions leaves pilots without a reference for the aircraft's orientation.
Airframe Structure
The Embraer 110 airframe suffered a partial break-up in flight due to the extreme aerodynamic loads encountered during the high-speed spiral dive.
Interesting Facts
- 01The aircraft was 15 years old and had logged 15,348 airframe hours.
- 02The weather at the time included a cloud base of 400 feet and visibility of approximately 1 kilometer.
- 03The aircraft was not equipped with a third (standby) artificial horizon, as it was not required by regulations at the time.
- 04The Captain had only gained his Airline Pilot's license one year prior to the accident.
- 05The First Officer had only 302 total flight hours, with 46 hours on the Embraer 110.
Safety Actions & Advisories
Standby Instrument Requirements
Source ↗The AAIB recommended that the Civil Aviation Authority (CAA) review the requirements for the carriage of a third, independent standby attitude indicator on all public transport aircraft, regardless of weight, when operated in Instrument Meteorological Conditions (IMC).
Instrument Failure Training
Source ↗The investigation highlighted the need for improved pilot training regarding the recognition of partial instrument failures and the use of secondary flight instruments (such as the turn and slip indicator) to maintain control during such emergencies.