
Détails:
A privately registered Bombardier Challenger 605, was conducting a flight from Palm Beach International Airport, Florida USA (KPBI) to Calgary Intl., AB (CYYC), with three crew members and 10 passengers on board. During the final descent into CYYC, the flight crew selected flaps 20 and immediately received a flaps fail caution message. The decision was made to abandon the approach, and the crew received clearance from ATC to proceed NW of the CYYC airport and troubleshoot the issue. The crew executed the applicable QRH procedure and subsequently received clearance from ATC to proceed with the landing. A flaps 0 landing was then executed. During the landing roll, after ground spoiler and thrust reverser deployment, the nose of the aircraft attained a significant nose high attitude. The rear fuselage of the aircraft struck the runway, and during the recovery, the nose landing gear subsequently impacted the runway. The aircraft taxied clear of the runway and to the intended parking area. Subsequent inspection
revealed that the aircraft sustained significant structural damage to the forward fuselage and minor damage to the rear fuselage. There were no injuries.
Findings as to causes and contributing factors
1. Moisture entered the flap flexible drive shaft casing, likely through the undetected puncture holes and the drive shaft casing to flap actuator interface, which led to the subsequent corrosion and failure of the inner drive shaft.
2. As the occurrence aircraftÂ’s actual annual utilization was approximately half of that expected by the manufacturer, the calendar time interval between maintenance inspections increased. As a result, the corrosion that developed was not detected because the shaft had not yet reached the 2400 flight-hour maintenance interval.
3. The Challenger 605 flight simulator used for recurrent training did not accurately represent the zero-flap handling characteristics of the aircraft when the thrust reversers are deployed, nor was it required for certification. As a result, the flight crew was inadequately prepared to prevent, or recover from, the nose pitch-up that occurred when the thrust reversers were deployed.
4. The pilot monitoring did not read the cautions included on the flaps fail checklist out loud to the pilot flying during the completion of the Quick Reference Handbook procedure. As a result, information critical to the safe operation of the aircraft was not brought to the pilot flyingÂ’s attention.
5. Insufficient pressure was applied to the control column to maintain the nose on the runway while using maximum reverse thrust; as a result, the nose pitched up, the aft fuselage contacted the runway, and the aircraft transitioned to a partial weight-off-wheels state.
6. When the left main wheel left the runway surface and the angle of attack reached 28.9°, the stick pusher activated and commanded a rapid nose-down pitch input. As a result of this rapid nose-down pitch, the forward section of the aircraft was damaged when the nose wheel contacted the runway.
| Statuts: | Accident investigation report completed and information captured |
| Date: | dimanche 23 février 2020 |
| Heure: | 14:30 |
| Type/Sous-type: |  Bombardier CL-600-2B16 Challenger 605 |
| Compagnie: | Canadian Pacific Railway Company |
| Immatriculation: | C-GKCP |
| Numéro de série: | 5945 |
| Année de Fabrication: | 2013 |
| Heures de vol: | 1699 |
| Cycles: | 920 |
| Moteurs: | 2 General Electric CF34-3B |
| Equipage: | victimes: 0 / Ã bord: 3 |
| Passagers: | victimes: 0 / Ã bord: 10 |
| Total: | victimes: 0 / Ã bord: 13 |
| Dégats de l'appareil: | Substantiels |
| Conséquences: | Repaired |
| Lieu de l'accident: | Calgary International Airport, AB (YYC) ( Canada)
|
| Phase de vol: | A l'atterrissage (LDG) |
| Nature: | Charter International |
| Aéroport de départ: | West Palm Beach International Airport, FL (PBI/KPBI), Etats-Unis d'Amérique |
| Calgary International Airport, AB (YYC/CYYC), Canada |
A privately registered Bombardier Challenger 605, was conducting a flight from Palm Beach International Airport, Florida USA (KPBI) to Calgary Intl., AB (CYYC), with three crew members and 10 passengers on board. During the final descent into CYYC, the flight crew selected flaps 20 and immediately received a flaps fail caution message. The decision was made to abandon the approach, and the crew received clearance from ATC to proceed NW of the CYYC airport and troubleshoot the issue. The crew executed the applicable QRH procedure and subsequently received clearance from ATC to proceed with the landing. A flaps 0 landing was then executed. During the landing roll, after ground spoiler and thrust reverser deployment, the nose of the aircraft attained a significant nose high attitude. The rear fuselage of the aircraft struck the runway, and during the recovery, the nose landing gear subsequently impacted the runway. The aircraft taxied clear of the runway and to the intended parking area. Subsequent inspection
revealed that the aircraft sustained significant structural damage to the forward fuselage and minor damage to the rear fuselage. There were no injuries.
Probable Cause:
Findings as to causes and contributing factors
1. Moisture entered the flap flexible drive shaft casing, likely through the undetected puncture holes and the drive shaft casing to flap actuator interface, which led to the subsequent corrosion and failure of the inner drive shaft.
2. As the occurrence aircraftÂ’s actual annual utilization was approximately half of that expected by the manufacturer, the calendar time interval between maintenance inspections increased. As a result, the corrosion that developed was not detected because the shaft had not yet reached the 2400 flight-hour maintenance interval.
3. The Challenger 605 flight simulator used for recurrent training did not accurately represent the zero-flap handling characteristics of the aircraft when the thrust reversers are deployed, nor was it required for certification. As a result, the flight crew was inadequately prepared to prevent, or recover from, the nose pitch-up that occurred when the thrust reversers were deployed.
4. The pilot monitoring did not read the cautions included on the flaps fail checklist out loud to the pilot flying during the completion of the Quick Reference Handbook procedure. As a result, information critical to the safe operation of the aircraft was not brought to the pilot flyingÂ’s attention.
5. Insufficient pressure was applied to the control column to maintain the nose on the runway while using maximum reverse thrust; as a result, the nose pitched up, the aft fuselage contacted the runway, and the aircraft transitioned to a partial weight-off-wheels state.
6. When the left main wheel left the runway surface and the angle of attack reached 28.9°, the stick pusher activated and commanded a rapid nose-down pitch input. As a result of this rapid nose-down pitch, the forward section of the aircraft was damaged when the nose wheel contacted the runway.
Accident investigation:

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Sources:
» TSB A20W0016Photos
Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre West Palm Beach International Airport, FL et Calgary International Airport, AB est de 3914 km (2446 miles).
Accident location: Approximate; accuracy within a few kilometers.
La distance entre West Palm Beach International Airport, FL et Calgary International Airport, AB est de 3914 km (2446 miles).
Accident location: Approximate; accuracy within a few kilometers.
Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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