CEN21LA414

NTSB accident investigation · Cessna 172S · LaSalle, CO · September 10, 2021

Accident · Minor injuriesClass 3 · LimitedFinal report
Date
September 10, 2021, 11:00 local (17:00 UTC)
Place
LaSalle, CO
Injuries
2 minor
Damage
Substantial damage
Phase of flight
Unknown
Aircraft
N2099JCessna 172S
Defining event
Unknown: Unknown or undetermined
Weather
Visual (VMC) · Day
Status
Completed · report January 14, 2026
Report
Approved by Office Director
Investigation class
Class 3
NTSB office
Central Region
Parties
FAA FSDO
FAA report
20210910012829A
Case key
103843

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

Probable cause

A loss of engine power for undetermined reasons.

Findings · 1

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Not determinedNot determined › Not determined · Unknown/Not determinedCessna 172S: 25 casesAll aircraft: 2,247 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

** This report was modified on January 13, 2026. Please see the docket for this accident to view the original report. ** The flight instructor and student pilot were conducting a simulated off-field emergency landing as part of a pre-solo cross-country progress check. The flight instructor told the student pilot to break off the maneuver and apply engine power, but the airplane’s engine did not respond when power was added. The flight instructor took control of the airplane and attempted to restart the engine with no success. He then declared an emergency and performed a 180° power-off turn to a field. During the touchdown, the airplane contacted a raised embankment, nosed over, and came to rest inverted. The airplane sustained substantial damage to both wings and the fuselage. A postaccident examination of the airframe and engine showed no preaccident failures or malfunctions that would have precluded normal operation. As a result, the cause of the total loss of engine power could not be determined.

Factual narrative

On September 10, 2021, about 1100 central daylight time , a Cessna 172S airplane, N2099J, was substantially damaged when it was involved in an accident near LaSalle, Colorado. The flight instructor and the student pilot sustained minor injuries. The airplane was operated under the provisions of Title 14 Code of Federal Regulations Part 91 as an instructional flight. The flight was intended as pre-solo cross-country progress check. The flight originated from Rocky Mountain Metropolitan Airport (BJC), Broomfield, Colorado. After 40 minutes of flight, the flight instructor told the student pilot to perform a touch-and-go landing at Greeley-Weld County Airport (GXY), Greeley Colorado, and then navigate back to BJC. After the touch-and-go landing at GXY, the flight instructor initiated a simulated high oil pressure and high temperature scenario as the airplane was in cruise flight at 7,500 ft mean sea level. The student pilot responded by initiating a return to GXY. During the return flight to GXY, the flight instructor reduced the engine power to 2,000 rpm and informed the student pilot that he had a simulated engine fire. The student pilot responded by reducing the engine power to idle and began a descent. Once the flight instructor announced that the simulated engine fire was out, the student pilot established a glide and chose a location for a simulated off-field emergency landing. When the airplane was at an altitude of about 1,000 ft above ground level, the flight instructor determined that the student pilot would safely reach the intended landing location. The flight instructor then instructed the student pilot to apply power, commence a go-around, and fly back to BJC. When the student pilot applied power, the engine did not respond. The flight instructor took control of the airplane and attempted to restart the engine with no success. The flight instructor then declared an emergency and performed a 180° power off turn to a different landing location than the student pilot had selected earlier. During the landing, the airplane contacted a raised embankment, nosed over, and came to rest inverted. The airplane sustained substantial damage to both wings and the fuselage. A postaccident examination of the airframe showed no preaccident failures or malfunctions that would have precluded normal operation. Postaccident examination of the engine showed continuity throughout. Both magnetos produced spark. The fuel lines, fuel distribution manifold, airbox, and fuel pumps were intact. Fuel was observed in the manifold and lines. The spark plugs showed normal signatures. Throttle and mixture cables to the cockpit were connected. The propeller remained attached to the engine at the flange. The spinner was crushed and broken in the aft direction. Both propeller blades were straight and showed little rotational damage.

Aircraft

Registration
N2099J
Reported as
Cessna 172S
Category
Airplane
Serial number
172S9586
Built
2004
Airframe hours
8,429
Engine
Lycoming IO-360-L2A, reciprocating
Damage
Substantial damage
Flight
Instructional · Part 91
Operator
Mcair
Registered owner
First Flight Aviation Services LLC
Airworthiness certificate
Standard, Normal
Last inspection
Annual · May 14, 2021
Departed
BJC · Broomfield, CO
Destination
BJC · Broomfield, CO
Flight plan
Company VFR
Equipment
ADS-B

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew · 2

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
41
Injuries
Minor
Certificates
Commercial, Flight instructor
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 1, Without waivers/limitations
Last flight review
May 6, 2021
Seat
Right
Restraint
4-point
Flight hours
938 total · 893 in this make and model
Role
Student pilot
Age
23
Injuries
Minor
Certificate
Student
Medical
Class 1, Without waivers/limitations
Seat
Left
Restraint
4-point
Flight hours
66 total · 66 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
Variable at 4 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
82 °F, dew point 43 °F
Altimeter
30.15 inHg
Observed at
KGXY, 6 nm away
METAR
METAR KGXY 101656Z AUTO VRB04KT 10SM CLR 28/06 A3015 RMK AO2 SLP172 T02780061

Docket · 8

The files NTSB released with the investigation on August 23, 2023, on NTSB’s docket system: statements, records, photos and specialists’ reports. 4.7 MB in all.

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.

Other investigations on N2099J · 1

Matched to the same aircraft by N-number and date.