The National Transportation Safety Board did not travel to the scene of this accident.
Additional Participating Entities:
Roy Dandy; Federal Aviation Administration / Flight Standards District Office; Denver, Colorado
Cirrus Aircraft; Duluth, Minnesota
Tango Tango Romeo LLC
Location: Twin Lakes, Colorado
Accident Number: CEN22LA176
Date and Time: April 13, 2022, 07:04 Local
Registration: N112TR
Aircraft: CIRRUS DESIGN CORP SR22
Injuries: 1 Minor
Flight Conducted Under: Part 91: General aviation - Personal
On April 13, 2022, at 0704 mountain daylight time, a Cirrus Design SR22 airplane, N112TR, was substantially damaged when it was involved in an accident near Twin Lakes, Colorado. The pilot sustained minor injuries. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight.
Automatic Dependent Surveillance – Broadcast (ADS-B) data depicted the airplane depart the Grand Junction Regional Airport (GJT) at 0621. The flight proceeded southeast before it turned east-northeast and climbed to flight level 210. At 0658, the pilot informed air traffic control of a loss of engine power.
The pilot’s efforts to restore engine power were unsuccessful and he deployed the Cirrus Airframe Parachute System (CAPS) at 0702.
The airplane came to rest upright in a mountain valley. The accident site consisted of rocky terrain with low brush. The fuselage and wing spar were damaged during the CAPS assisted touchdown.
Post-recovery airframe and engine examinations are planned.
Aircraft and Owner/Operator Information
Aircraft Make: CIRRUS DESIGN CORP
Registration: N112TR
Model/Series: SR22
Aircraft Category: Airplane
Amateur Built:
Operator:
Operating Certificate(s) Held: None
Operator Designator Code:
Meteorological Information and Flight Plan
Conditions at Accident Site: VMC
Condition of Light: Day
Observation Facility, Elevation: KLXV,9943 ft msl
Observation Time: 07:03 Local
Distance from Accident Site: 8 Nautical Miles
Temperature/Dew Point: -14°C /-17°C
Lowest Cloud Condition:
Wind Speed/Gusts, Direction: 5 knots / 0 knots, 340°
Lowest Ceiling: Overcast / 2900 ft AGL
Visibility: 0.75 miles
Altimeter Setting: 29.71 inches Hg
Type of Flight Plan Filed: IFR
Departure Point: Grand Junction, CO (GJT)
Destination: Englewood, CO (APA)
Wreckage and Impact Information
Crew Injuries: 1 Minor
Aircraft Damage: Substantial
Passenger Injuries: N/A
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 1 Minor
Latitude, Longitude: 39.094174,-106.36934
Aircraft lost engine power, deployed parachute.
Date: 13-APR-22
Time: 12:50:00Z
Regis#: N112TR
Aircraft Make: CIRRUS
Aircraft Model: SR22
Event Type: ACCIDENT
Highest Injury: MINOR
Aircraft Missing: No
Damage: SUBSTANTIAL
Activity: PERSONAL
Flight Phase: EN ROUTE (ENR)
Operation: 91
City: TWIN LAKES
State: COLORADO
WARRANTY: There is no warranty, express or implied for the information provided herein or the condition, useability, workability, operability or marketability of the aircraft salvage. All times are approximate and the logbooks and aircraft should be inspected by each bidder BEFORE BIDDING. Failure of the bidder to view the salvage or wreckage, or confirm any information provided is NOT grounds for a claim or withdrawal of bid after bid closing date. All Sales Are FINAL.
HOURS estimated from logbooks or other information - not guaranteed or warranted
AIRCRAFT: 2010 Cirrus SR22 N112TR, s/n: 3669, Hobbs: 2073.2
ENGINE: Continental IO, -550N (Turbo Alley) s/n 1001689, TSN: 2879.9, TSOH: 637.6
PROPELLER: Hartzell PHC-J3Y1F-1N s/n: NJ305B, Present Hours: 2073.2, TBO Hours: 2073.2
EQUIPMENT: Garmin G1000 Perspective
DESCRIPTION OF ACCIDENT: On 04/13/22, loss of engine power due to unknown reason while in IMC resulting in activation of BRS and forced landing.
DESCRIPTION OF DAMAGES: Damage occurred to the fuselage and landing gear. Damage to the composite structure of the wing is not known.
Two (2) propeller blades had rotational impact damage and a sudden stoppage to the engine.
LOCATION OF AIRCRAFT: Beegles Recovery and Storage, Colorado.
REMARKS:
Insurer reserves the right to reject any and all bids.
Salvage is as is/where is.
The posting information is the best to our knowledge.
Logbooks may not be complete.
Read more here: http://www.avclaims.com
12:57Z cruising "Groundspeed: 201 kt Baro. Altitude: ▲ 23025 ft Geom. Altitude: 22225 ft Vert. Rate: 384 ft/min Track: 75.9°" Pos.:39.015°, -106.580° when the engine apparently quit.
ReplyDelete13:03Z last return
Groundspeed: 12 kt
Baro. Altitude: on ground
Geom. Altitude: 14100 ft
Vert. Rate:-1984 ft/min
Pos.: 39.095°, -106.374°
Ugh, rather than posting random points, here is the whole track so everyone can look for themselves: https://globe.adsbexchange.com/?icao=a0355a&lat=39.027&lon=-106.408&zoom=11.4&showTrace=2022-04-13&trackLabels
DeleteHeck of a place to lose your engine surrounded by peaks as high as 14,433
Air being less dense at 14K presumably yields a higher impact speed for the chute than reaching ground at sea level. Has anyone done the calculation? Inquiring spines want to know..
DeleteNo expert, but dynamic pressure, which in this case is the force per area (shute area) "pushing" against the force (= mass(weight) * acceleration (g)) of the falling plane, is 1/2 v^2 * density.
DeleteIn other words, at half the density (that would be at 18,000 feet) the speed needs to be ~1.4 times (square root of 2) higher for the same dynamic pressure, so at bit less than 1.4-times faster at 14,000 feet.
Air density/pressure is not linearly decreasing with altitude (unlike water when diving) because gases are compressible, meaning the exact factor for 14,000 feet is a calculation I cannot do in my head while writing this.
Tailwinds!
Thanks for the response, will have to settle for a hypothetical. :-)
DeletePutting Gas Law aside, the unspecified for 14K MSL (but a little bit faster) chute descent suffers from the square term for energy carried into ground impact. Making a relative comparison of energy at two speeds only requires evaluating the square of the speed term in order to be informative of the difference.
Two unverified on-chute Cirrus descent speeds returned by casual search are 22 and 28 feet per second. 28 feet per second is six feet per second faster that 22, which is 6/22 x 100 = 27 percent speed increase over 22 fps.
Looking at the energy equation square term:
22 x 22 = 484
28 x 28 = 784
784 is 300 units more than 484. 300 units is 300/484 x 100 = 62 percent higher energy than impacting while at 22 feet per second.
It would be interesting to know the official descent velocities from Cirrus for chute landing (of equivalent weight/loaded aircraft) to both a sea level and 14K MSL location. Not a criticism, just curiosity...
I wrote the above answer but have no idea what you are talking about.
DeleteThe question (was that you?) was about impact speed, not "energy carried into ground impact", which has everything to do with the combined gas law as well as the dynamic pressure equation I provided (without any coefficient) to close in on an answer and doesn't suffer from a square term.
Your calculation of said square term from the two published descent speeds is cumbersome as you already calculated a 27 percent increase in speed and simply square 1.27 to get to ~1.62 instead of the detour with 300/484.
I can only hope you are clearer and straight forward when flying.
There are probably other factors at play like angle of attack of the chute (not shite as I misspelled) and chute design features i simply have no idea about.
Tailwinds
Sorry that you reacted negatively to the thank you by perceiving the response as criticism, it was not intended to be perceived that way. Appreciation of your reply included not replying with snark for the spelling of shute area since your intent there was clear.
DeleteComparing energy to be dissipated upon ground impact at differing descent velocities was the purpose of posting the original question about speed on the chute.
You would know that energy of mass in motion is 1/2mV^2
For the purpose of discussion, calculating the percentage change between two velocities and then similarly presenting the percentage change for two associated energy calculations was just a step by step presentation choice intended to make it easy for anyone to follow.
Regarding perceptions while online:
Communication misunderstandings are unfortunate but not uncommon. The most enduring example from my own experience came from this statement offered to supervisors by a manager as advice to supervisors that reported to him:
"Always share credit, never share blame"
The manager intended to convey the principle of making sure that those who were supervised got the credit they deserved and not be blamed.
But the manager had a legendary reputation of taking credit for work he had not contributed to and he always avoided taking responsibility for his own errors.
The supervisors left the meeting shocked in their perception that the manager had openly advocated taking credit for other people's work and not taking on any blame yourself, because they knew the boss conducted himself in exactly such a manner in his dealings with the supervisors.
In spite of his flaws, that wasn't what the manager intended to convey. A substantial amount of conflict and misunderstanding seen online suffers similar unintended misperception made worse by the limitations of text based asynchronous comment exchange.
Offering a hypothetical energy comparison was not done as snark to your reply. Still interested in seeing useful calculations for chute landings at both elevations.
^^ Unintended runaway italics after the managers statement. Sure do miss the preview function... :-)
DeleteMETARs for Leadville airport at the time:
ReplyDeleteKLXV 131212Z AUTO 35009G15KT 3SM -SN BKN018 M14/M17
A2970 RMK AO2 P0001 T11391167
KLXV 131232Z AUTO 33005KT 10SM FEW016 BKN070 OVC100 M14/M18
A2970 RMK AO2 SNE17 P0001 T11391178
KLXV 131303Z AUTO 34005KT 1 3/4SM -SN OVC029 M14/M17
A2971 RMK AO2 P0000 T11391167
KLXV 131321Z AUTO VRB05KT 3/4SM -SN VV017 M14/M17
A2972 RMK AO2 P0000 T11391167
KLXV 131333Z AUTO 31009KT 2SM -SN OVC017 M14/M17
A2972 RMK AO2 P0000 T11391167