Created Thursday, Jul 15th 2021 10:16Z, last updated Wednesday, Aug 25th 2021 10:51Z
An Air Baltic Bombardier C-Series CS-300, registration YL-AAQ performing flight
BT-139 from Riga (Latvia) to Copenhagen (Denmark), landed on Copenhagen's runway 04L when both engines automatically shut down. The aircraft rolled out, the crew managed to steer the aircraft clear of the runway. The aircraft was subsequently towed to the apron.
The aircraft is still on the ground in Copenhagen about 4 days later.
On Jul 26th 2021 the Canadian TSB reported:
On top of the descent to EKCH, the flight crew disengaged the Auto Throttle (AT) and extended the flight spoilers to reduce speed of the aircraft. The right-hand throttle fail Master Caution light came on a few seconds after the AT disengaged. The right-hand throttle fail abnormal checklist was completed and the approach continued. After touch down with both main landing gear on the ground, both engines shutdown.
The aircraft came to full stop on the taxiway and was towed to the gate. The Accident Investigation Board of Denmark delegated the investigation to the TSB, as per ICAO Annex 13. The TSB opened a Class 3 investigation.
On Aug 25th 2021 the Danish Havarikommissionen (HCL) released their final note confirming the investigation has been delegated to the Canadian TSB and added the following tag line: "A safety feature unknown to the pilots and operator stopped both engines immediately after landing on the runway". The HCL summarized the sequence of events:
When the aircraft began the descent inbound EKCH, with the autopilot and the autothrottle engaged, the flight crew retarded the thrust levers to the idle position resulting in a disengagement of the autothrottle.
Shortly after the disengagement of the autothrottle, the R THROTTLE FAIL master caution light illuminated. The flight crew performed the applicable Non-normal Airplane Flight Manual procedure.
Upon touchdown, with both main landing gears on the ground, an uncommanded dual engine shutdown occurred.
The flight crew maintained aircraft control, vacated the runway and came to a full stop on the taxiway.
There were no injuries.
The serious incident occurred in daylight and under Visual Meteorological Conditions (VMC).
Damage to aircraft: None.
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