ANC07CA023

NTSB accident investigation · Cessna 172 · Chugiak, AK · March 10, 2007

Accident · No injuriesData collectionFinal report
Date
March 10, 2007, 12:00 local (16:00 UTC)
Place
Chugiak, AK
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N73813Cessna 172
Weather
Visual (VMC) · Day
Status
Completed · report May 29, 2007
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
20070310002969A
Case key
65414

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

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Probable cause

The instructor pilot's inadequate supervision of the student while landing, which resulted in an undershoot, and subsequent in-flight collision with snow-covered terrain.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

UndershootApproach - vfr pattern - final approach
Distance/altitude - misjudgedDual student
Supervision - inadequatePilot in command(cfi)Cause
In flight collision with terrain/waterApproach - vfr pattern - final approach
Terrain condition - snow covered

Analysis

The certificated flight instructor was providing primary flight instruction to the student pilot under Title 14, CFR Part 91, at the time of the accident. The flight instructor reported that while on final approach to land, he inadvertently allowed the student pilot to descend into a snow-covered area, about 40 feet short of the runway threshold. As the airplane's main wheels contacted an area of deep, hard packed snow, the airplane nosed down, and right wing struck the snow-covered terrain, sustaining substantial damage. The instructor noted that there were no preaccident mechanical anomalies with the airplane.

Factual narrative

The certificated flight instructor was providing primary flight instruction to the student pilot under Title 14, CFR Part 91, at the time of the accident. The flight instructor reported that while on final approach to land, he inadvertently allowed the student pilot to descend into a snow-covered area, about 40 feet short of the runway threshold. As the airplane's main wheels contacted an area of deep, hard packed snow, the airplane nosed down, and right wing struck the snow-covered terrain, sustaining substantial damage. The instructor noted that there were no preaccident mechanical anomalies with the airplane.

Aircraft

Registration
N73813
Reported as
Cessna 172
Category
Airplane
Serial number
17267693
Engine
Lycoming O-360, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Instructional · Part 91
Operator
Elmendorf Aero Club
Registered owner
United States Air Force
Airworthiness certificate
Standard, Normal
Departed
EDF · Anchorage, AK
Destination
BCV · Chugiak, AK
Flight plan
Company VFR
Airport
BCV · Birchwood Airport, runway 19R, 4,010 × 100 ft, asphalt

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
Flight instructor
Age
31
Injuries
None
Certificates
Flight instructor, Commercial
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
June 1, 2005
Seat
Right
Flight hours
905 total · 558 in this make and model · 822 as pilot in command · 128 in the last 90 days · 56 in the last 30 days · 3 in the last 24 hours
Role
Student pilot
Age
31
Injuries
None
Certificate
Student
Medical
Class 3, Without waivers/limitations
Seat
Left
Flight hours
8 total · 5 in this make and model · 5 in the last 90 days · 4 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
23 °F, dew point 5 °F
Altimeter
29.52 inHg

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 N73813 · 1

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