ASN Wikibase Occurrence # 189908
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| Date: | Thursday 8 September 2016 |
| Time: | 13:15 UTC |
| Type: |  AgustaWestland AW139 |
| Owner/operator: | Kenya Police Air Wing |
| Registration: | 5Y-NPS |
| MSN: | 31717 |
| Year of manufacture: | 2016 |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Destroyed |
| Location: | Mathare North, Nairobi -
 Kenya
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Aerial patrol |
| Departure airport: | Nairobi-Wilson Airport (WIL/HKNW) |
| Nairobi-Wilson Airport (WIL/HKNW) |
After a brief flight of approximately 9 minutes, the helicopter established hover above the Mathare area in Nairobi, at approximately 5700ft barometric altitude. Witnesses from the ground reported that the aircraft spent about 2 minutes in HOGE above Mathare, before suddenly losing altitude and crashing inside the perimeter of the National Youth Service Engineering Institute, while spinning around the vertical axis with a significant yaw rate at 13.15 UTC, consistent with videos posted on social media. Three POB suffered serious injuries and one minor injuries.
At 13:14:49, the following chain of events occurred:
The pilot significantly increased the collective.
The torque limiter logic prevented the engines from exceeding 110% torque.
The Nr drooped to 96% with the “ROTOR LOW” Aural Warning.
The pilot compensated for the right yaw with left pedal.
The pilot lowered the collective 20% in about 2.5s.
Nr returned to 100%, descent rate increased, and the aircraft started to yaw left.
Aircraft reached 20°nose-down, 4000ft vertical speed, and 60kts ground speed.
At 13:15:03, the following occurred:
A sudden rise in collective input without any pedal compensation; the yaw rate increased.
The aircraft crashed with a spiraling motion.
Sources:
https://www.the-star.co.ke/news/2016/09/08/four-cops-injured-after-new-police-helicopter-crashes-in-mathare_c1417430
https://www.nation.co.ke/image/view/-/3179790/highRes/1313957/-/maxw/600/-/12atbpcz/-/Chopper.jpg
https://www.telegraph.co.uk/news/2016/09/10/terrifying-moment-police-helicopter-crashes-over-slums-in-nairob/
https://www.the-star.co.ke/news/2016/09/20/uncertified-pilot-crashed-police-helicopter_c1423025
https://www.nation.co.ke/news/Police-yet-to-complete-probe-on-Sh2-3-billion-chopper-crash/1056-4560454-format-xhtml-ytmsdvz/index.html
https://www.abraphe.org.br/10seminario/pdf/leonardo.pdf
https://www.transport.go.ke/sites/default/files/preliminary-reports/5Y-NPS.pdf
Media:
Auditor General Report: Sh2.2 billion was lost after an Augusta Westland AW-139 Helicopter (5Y-NPS) crashed four months after it was acquired, yet no accident report was provided to facilitate compensation. #TaxJusticeTuesday @NPSOfficial_KE @PoliceKE @InteriorKE @KenyaTreasury pic.twitter.com/ONJBuLhd0a
— Ushuru na Huduma (@UshuruNaHuduma) March 6, 2018
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Sep-2016 14:32 | harro | Added |
| 08-Sep-2016 15:46 | CTYONE | Updated [Registration, Cn, Operator, Total occupants, Source] |
| 08-Sep-2016 16:48 | CTYONE | Updated [Aircraft type] |
| 08-Sep-2016 19:50 | Aerossurance | Updated [Phase, Nature, Narrative] |
| 09-Sep-2016 05:27 | Iceman 29 | Updated [Embed code] |
| 09-Sep-2016 09:01 | TB | Updated [Damage] |
| 10-Sep-2016 06:31 | Anon. | Updated [Departure airport, Destination airport, Embed code, Photo, ] |
| 10-Sep-2016 14:36 | Iceman 29 | Updated [Embed code] |
| 11-Sep-2016 10:26 | Aerossurance | Updated [Source, Narrative] |
| 20-Sep-2016 07:09 | Aerossurance | Updated [Source] |
| 11-Oct-2018 19:39 | Aerossurance | Updated [Time, Departure airport, Destination airport, Source, Narrative] |
| 27-Oct-2019 18:02 | Aerossurance | Updated [Embed code] |
| 27-Oct-2019 18:04 | Aerossurance | Updated [Embed code] |
| 27-Oct-2019 18:13 | Aerossurance | Updated [Source, Embed code, Narrative] |
| 10-Sep-2023 11:57 | RIPIT01 | Updated [[Source, Embed code, Narrative]] |
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