ASN Wikibase Occurrence # 306205
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| Date: | Friday 9 December 2022 |
| Time: | 14:25 LT |
| Type: |  Pilatus PC-24 |
| Owner/operator: | Volkswagen AirService |
| Registration: | D-CMSL |
| MSN: | 266 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | None |
| Category: | Incident |
| Location: | 8 nm south-east of Liverpool-John Lennon International Airport (LPL) -
 United Kingdom
|
| Phase: | En route |
| Nature: | Executive |
| Departure airport: | Liverpool-John Lennon International Airport (LPL/EGGP) |
| Birmingham International Airport (BHX/EGBB) | |
| Investigating agency: | AAIB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The Pilatus PC-24, D-CMSL, owned by Platoon Aviation and operated by Volkswagen AirService as flight BTX525, suffered an uncommanded pitch down due to a loss of elevator control causing the auto-pilot to disconnect. The aircraft was controllable using pitch trim until the elevator became usable. Possible obstruction due to icing.
Conclusion
With the autopilot engaged, the aircraft did not capture the commanded cruise flight level but continued to climb before then pitching down and descending 800 ft below it. The uncommanded descent was halted by the intervention of the PF pulling the control column rearwards, which also caused the autopilot to disengage.
The PF found the elevators very stiff to move, requiring high force inputs on the control yoke for small elevator movements. The use of the QRH jammed elevator control procedure was successful and allowed the crew to maintain control of the aircraft and to descend, during which normal elevator control was regained.
The investigation could not identify the cause of the stiff elevators and the aircraft manufacturer is not aware of any similar stiff or jammed elevator events on the PC-24 fleet.
The possibility that the elevator restriction was caused by ice formation on the elevator control system could not be excluded.
Accident investigation:
 |
|
Sources:
1. https://www.sust.admin.ch/inhalte/AV-berichte/D-CMSL_Notification.pdf
2. https://www.flightradar24.com/data/aircraft/d-cmsl
3. https://www.planelogger.com/Aircraft/Registration/D-CMSL/1066531
4. https://en.wikipedia.org/wiki/Liverpool_John_Lennon_Airport
Images:
FDR data for the cruise portion of the incident flight (Figure: AAIB)
Media:
A nice looking Pilatus PC-24 D-CMSL on final for Glasgow yesterday afternoon #Avgeek #Aviation #Photo #Photography #Planespotting #Pilatus #PC24 pic.twitter.com/445r73kjBu
— Kyle McKinlay (@KM_Aviation) January 7, 2023
D-CMSL PC-24 on 29/08/2022 at Prestwick (PIK/EGPK)Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Jan-2024 10:54 | harro | Updated [Total occupants, Other fatalities, Location, Embed code, Narrative, Photo] |
| 25-Jan-2024 18:38 | harro | Updated [Other fatalities, Accident report] |
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