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ASN Wikibase Occurrence # 191455
Last updated: 1 July 2020
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Date:17-NOV-2016
Time:12:40
Type:Remos GX
Owner/operator:
Registration: AJ-2666
C/n / msn: 364
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Saijia, Sandimen Township, Pingtung County -   Taiwan
Phase: Initial climb
Nature:Training
Departure airport:Saijia Airfield
Destination airport:Saijia Airfield
Investigating agency: ASC
Narrative:
A Remos GX ultralight departed from runway 26 at Saijia Airfield, Taiwan on a training flight. Ten minutes after takeoff, the aircraft impacted tjhe ground on the left side of the runway after executing a touch and go on runway 26.

Conclusion:
After the ultra-light vehicle lifted off, the air speed decreased as a result of high climb rate and the maximum power had not been set. In the meantime, the stall speed was raised due to the increasing wing loading induced by the pilot's high pitch maneuver during initial climb. Thus, the safety margin between air speed and stall speed was narrowed, and the controllability and stability of the vehicle was reduced. The airflow probably started to separate from left wing and affected the lift since the crosswind was coming from the right. It caused a left bank and further raised the stall speed of the vehicle. By the time the instructor took control, he felt that the vehicle was not controllable and the wings could not be leveled. The vehicle then continued to fall in stall condition. The ultra-light vehicle entered a stall at low altitude in an unexpected condition. The instructor's stall recovery maneuvers with respect to the rudder, column, and power control were not exactly in accordance with the corresponding procedure. Consequentially, the stall was not recovered in time, and the vehicle lost altitude and impacted the ground.

Sources:

http://www.asc.gov.tw/main_en/docDetail.aspx?uid=318&pid=318&docid=824

Safety recommendations:

Safety recommendation ASC-ASR-17-08-001 issued 18 August 2017 by ASC to CAA Taiwan
Safety recommendation ASC-ASR-17-08-002 issued 18 August 2017 by ASC to Kaixiang Aviation Activity Enhancement Association
Safety recommendation ASC-ASR-17-08-003 issued 18 August 2017 by ASC to Kaixiang Aviation Activity Enhancement Association
Safety recommendation ASC-ASR-17-08-004 issued 18 August 2017 by ASC to Kaixiang Aviation Activity Enhancement Association


Revision history:

Date/timeContributorUpdates
19-Nov-2016 12:23 harro Added
18-Aug-2017 12:14 harro Updated [Cn, Source, Damage, Narrative]

Corrections or additions? ... Edit this accident description