Accident AgustaWestland AW139 5N-CML,
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ASN Wikibase Occurrence # 221445
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Date:Saturday 2 February 2019
Time:14:34 LT
Type:Silhouette image of generic A139 model; specific model in this crash may look slightly different    
AgustaWestland AW139
Owner/operator:Caverton Helicopters
Registration: 5N-CML
MSN: 31389
Year of manufacture:2012
Total airframe hrs:4872 hours
Fatalities:Fatalities: 0 / Occupants: 12
Aircraft damage: Written off (damaged beyond repair)
Location:near Kabba, Kogi State -   Nigeria
Phase: Landing
Nature:Passenger - Non-Scheduled/charter/Air Taxi
Departure airport:Abuja
Destination airport:Kabba
Investigating agency: AIB Nigeria
Confidence Rating: Accident investigation report completed and information captured
The helicopter crashed and came to rest on its side after a brownout at an unsurveyed site. There were no injuries reported. The Nigerian Vice President, Yemi Osinbajo, and his brother were among the occupants of the helicopter.
The aircraft was chartered for the Presidential election campaign.

Causal factor
The flight crew encountered a brownout condition during the hover to land, which led to the loss of external visual references, spatial disorientation and loss of situational awareness resulting in a misjudgement of distance and ground clearance, as the flight crew tried to control the helicopter’s movements for landing. The helicopter landed hard
and rolled over on its right side.
Contributory factors
1. Inappropriate landing technique used.
2. Non-adherence to company procedures for known or anticipated brownout condition during landing.
3. Lack of risk assessment, limited landing site preparation and planning prior to the commencement of the flight.


Last ASN occurence about Yemi Osinbajo:

Accident investigation:
Investigating agency: AIB Nigeria
Report number: CHL/2019/02/02/F
Status: Investigation completed
Duration: 1 year and 6 months
Download report: Final report



Photo: AIB Nigeria

Revision history:

02-Feb-2019 14:40 gerard57 Added
02-Feb-2019 14:51 gerard57 Updated [Operator, Location, Damage, Narrative]
02-Feb-2019 15:06 Aerossurance Updated [Embed code]
02-Feb-2019 15:07 Iceman 29 Updated [Aircraft type, Source, Embed code, Narrative]
02-Feb-2019 15:08 Aerossurance Updated [Aircraft type, Source, Embed code, Narrative]
02-Feb-2019 15:10 Iceman 29 Updated [Embed code]
02-Feb-2019 15:12 Aerossurance Updated [Operator, Source, Embed code, Narrative]
02-Feb-2019 15:15 Aerossurance Updated [Embed code, Narrative]
02-Feb-2019 15:15 Aerossurance Updated [Phase]
02-Feb-2019 15:19 Aerossurance Updated [Embed code, Narrative]
02-Feb-2019 15:19 Iceman 29 Updated [Source, Embed code, Narrative]
02-Feb-2019 15:22 Aerossurance Updated [Source, Embed code, Narrative]
02-Feb-2019 15:29 Aerossurance Updated [Phase, Source]
02-Feb-2019 15:32 Aerossurance Updated [Embed code]
02-Feb-2019 16:32 Iceman 29 Updated [Embed code]
02-Feb-2019 16:41 Iceman 29 Updated [Embed code]
02-Feb-2019 18:56 Geno Updated [Time, Registration, Cn, Phase, Source]
03-Feb-2019 12:14 Iceman 29 Updated [Operator, Nature, Source, Narrative]
03-Feb-2019 20:22 harro Updated [Time, Registration, Cn, Embed code]
03-Feb-2019 20:23 harro Updated [Operator, Embed code]
03-Feb-2019 20:23 harro Updated [Total occupants, Destination airport]
03-Feb-2019 20:28 Aerossurance Updated [Narrative]
03-Feb-2019 20:30 Aerossurance Updated [Narrative]
04-Feb-2019 12:28 Aerossurance Updated [Source, Narrative]
13-Feb-2019 20:54 Aerossurance Updated [Time, Source, Embed code, Narrative]
30-Oct-2019 20:48 Aerossurance Updated [Source, Embed code]
30-Jul-2020 19:49 Aerossurance Updated [Operator, Departure airport, Source]
30-Jul-2020 19:50 Aerossurance Updated [Damage]
31-Jul-2020 09:02 Aerossurance Updated [Source]
31-Jul-2020 09:21 Aerossurance Updated [Embed code]
31-Jul-2020 11:45 harro Updated [Embed code, Narrative, Photo, Accident report, ]
31-Jul-2020 11:47 harro Updated [Embed code, Accident report, ]
13-Nov-2023 11:55 harro Updated [Other fatalities, Narrative]

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