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ASN Wikibase Occurrence # 190140
Last updated: 17 January 2022
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Type:Silhouette image of generic DH8D model; specific model in this crash may look slightly different
de Havilland Canada DHC-8-402Q Dash 8
Registration: YL-BAI
MSN: 4302
Fatalities:Fatalities: 0 / Occupants: 67
Other fatalities:0
Aircraft damage: Minor
Location:Riga -   Latvia
Phase: Landing
Nature:Passenger - Scheduled
Departure airport:RIX
Destination airport:ZRH
Investigating agency: TAIIB Latvia
Front gear didn't fully retract after takeoff for flight BT641, the plane went on to burn down fuel and later emergency-landed safely back at RIX with front gear partially deployed (stuck a bit outside the fuselage at the same point it got stuck when taking off).

It's reported that only front gear bay doors were damaged during the landing.

Root cause:
Root cause is insufficient retention of the bushings in the LLL body.
Direct cause:
Excessive clearance in the mechanism by virtue of corrosion of LLL hole and wear of bushing OD.
Possible contributing causes:
1. Moisture and runway de-icers penetration in the joint, salt based (potassium formate and sodium acetate) cadmium plating dissolving and base metal corrosion progression.
2. Insufficient tightness applied in fastening bushings with LLL hole.
3. Possibility that the upper lock link pin failed simultaneously with the LLL pin or when the lugs of the lower drag strut came into contact with the upper lock link.


Accident investigation:
Investigating agency: TAIIB Latvia
Status: Investigation completed
Download report: Final report



Photo of YL-BAI courtesy

Helsinki - Vantaa (EFHK / HEL)
25 June 2019; (c) Pertti Sipilä

Revision history:

17-Sep-2016 15:48 Kavacky Added
17-Sep-2016 15:51 Kavacky Updated [Total occupants]
17-Sep-2016 17:41 harro Updated [Aircraft type, Cn, Operator, Source, Embed code]
19-Sep-2016 18:29 Kavacky Updated [Embed code]
19-Sep-2016 18:32 Kavacky Updated [Embed code]
25-Aug-2020 12:28 KagurazakaHanayo Updated [Time, Source, Narrative]
25-Aug-2020 12:28 harro Updated [Narrative, Accident report, ]

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