ASN Wikibase Occurrence # 268163
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| Date: | Tuesday 28 September 2021 |
| Time: | 09:00 |
| Type: |  Rockwell 690B Turbo Commander |
| Owner/operator: | Surdex Corp |
| Registration: | N690LS |
| MSN: | 11475 |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 7854 hours |
| Engine model: | Air Research TPE331-10T-51 |
| Fatalities: | Fatalities: 3 / Occupants: 3 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Hiles, WI -
 United States of America
|
| Phase: | En route |
| Nature: | Survey |
| Departure airport: | Rhinelander-Oneida County Airport, WI (RHI/KRHI) |
| Rhinelander-Oneida County Airport, WI (RHI/KRHI) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
On September 28, 2021, about 0900 central daylight time, a Rockwell International 690B airplane, N690LS, was destroyed when it was involved in an accident near Hiles, Wisconsin. The pilot and two passengers sustained fatal injuries. The airplane was operated as a Title 14 Code of Federal Regulations (CFR) Part 91 aerial imagery survey flight.
The company pilot and two employees had departed on an aerial imagery survey flight of forest vegetation. The airplane began to level off at an altitude of about 16,100 ft mean sea level (msl) and accelerated to a maximum recorded groundspeed of 209 knots. Less than 2 minutes later, the groundspeed decreased to about 93 knots, and the airplane descended about 500 ft while on a steady heading. The airplane subsequently entered a rapid descent and a right turn, and “mayday, mayday, mayday” and “we’re in a spin” transmissions were broadcast to air traffic control (ATC). A witness, who was located near the accident site, noticed the airplane nose down at high rate of speed and then saw the airplane spinning rapidly about its longitudinal axis. The airplane wreckage was located in remote wetlands and wooded terrain.
Postaccident examination revealed that the airplane impacted the ground in a nose-low vertical attitude and at high speed. All major components of the airplane were located at the accident site. Examination of the airframe, engines, and propellers revealed no preimpact mechanical malfunctions or failures that would have precluded normal operation.
According to the aircraft performance study for this accident, when the airplane pitched down, the normal load factor decreased rapidly from about 1.6 to less than 1 G. A rapid decrease in normal load factor is consistent with a stall when the wing exceeds its critical angle of attack. At that point, the air flow becomes separated at the wing, and the wing can no longer generate the necessary lift. If the airplane is in uncoordinated flight at the stall, a spin can result. Thus, the pilot likely did not maintain adequate airspeed, causing the airplane to exceed its critical angle of attack and enter a stall and spin.
An important but unknown factor before and during the initial stall was the behavior of the pilot regarding his flight control inputs, including his possible attempt to recover. The airplane’s Pilot Operating Handbook states that spins are not authorized and does not include a procedure for inadvertent spin recovery.
Probable Cause: The pilot’s failure to maintain adequate airspeed, which caused the airplane to exceed its critical angle of attack and enter an inadvertent stall and spin.
Accident investigation:
 |
|
Sources:
https://wausaupilotandreview.com/2021/09/28/plane-crashes-near-three-lakes-in-northern-wis/
https://lacrossetribune.com/news/state-and-regional/authorities-3-killed-in-crash-of-small-plane-in-northern-wisconsin/article_721017f4-3f75-53de-bb4b-5530df0ddf82.html
NTSB
https://flightaware.com/live/flight/N690LS (now blocked)
https://globe.adsbexchange.com/?icao=a92bc1&lat=45.896&lon=-89.089&zoom=12.4&showTrace=2021-09-28&leg=2&trackLabels
https://flightaware.com/photos/aircraft/N690LS
https://cdn.jetphotos.com/full/5/17112_1609778981.jpg (photo)
Location
Images:
Media:
NTSB is investigating the September 28, 2021, crash of a Rockwell International 690B Turbo Commander airplane near Eagle River, Wisconsin.
— NTSB_Newsroom (@NTSB_Newsroom) September 28, 2021
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Sep-2021 18:17 | Geno | Added |
| 28-Sep-2021 18:37 | harro | Updated [Aircraft type, Source] |
| 28-Sep-2021 19:11 | RobertMB | Updated [Aircraft type, Other fatalities, Location, Source, Embed code, Narrative] |
| 28-Sep-2021 22:48 | Captain Adam | Updated [Registration, Cn, Operator, Total occupants, Location, Phase, Departure airport, Source, Embed code, Damage, Narrative] |
| 29-Sep-2021 06:44 | aaronwk | Updated [Source, Narrative] |
| 29-Sep-2021 10:45 | aaronwk | Updated [Time, Narrative] |
| 29-Sep-2021 11:44 | RobertMB | Updated [Time, Total fatalities, Nature, Source, Narrative] |
| 30-Sep-2021 01:51 | Iceman 29 | Updated [Source, Narrative] |
| 30-Sep-2021 16:09 | johnwg | Updated [Nature, Source, Narrative] |
| 12-Oct-2021 16:17 | aaronwk | Updated [Time, Location, Nature, Destination airport, Source, Narrative, Category] |
| 12-Oct-2021 21:05 | Captain Adam | Updated [Source, Narrative] |
| 08-Jun-2023 22:04 | Captain Adam | Updated [[Source, Narrative]] |
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