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NTSB Report
September 1, 2016 · Cessna 172 P · N52950
Anchorage, AK
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
September 1, 2016
Injury Outcomes
No injuries (2 uninjured)
Location
Anchorage, AK
Aircraft
Cessna 172 P (1981)
Tail Number
N52950
Operator
Land and Sea Aviation Alaska
Injuries
None
Aircraft Damage
Substantial
NTSB Number
GAA16CA487
The flight instructor reported that during taxi the airplane started to lean to the right, so he looked out of his window to see if the right tire was flat. He further reported that "the ramp was opening up into a 2 foot wide dark black hole" underneath the right main landing gear. The flight instructor and student pilot egressed from the airplane without further incident. A postaccident examination revealed substantial damage to the empennage. The flight instructor reported no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. Photographs provided by Federal Aviation Administration showed that the right main landing gear had broken through the pavement into a sink hole underneath.
NTSB Probable Cause
Environmental issues-Physical environment-Runway/land/takeoff/taxi surface-(general)-Effect on equipment - C
Full Narrative
The flight instructor reported that during taxi the airplane started to lean to the right, so he looked out of his window to see if the right tire was flat. He further reported that "the ramp was opening up into a 2 foot wide dark black hole" underneath the right main landing gear. The flight instructor and student pilot egressed from the airplane without further incident. A postaccident examination revealed substantial damage to the empennage. The flight instructor reported no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. Photographs provided by Federal Aviation Administration showed that the right main landing gear had broken through the pavement into a sink hole underneath.
Flight
Event TypeAccident
Event Time13:12 AKDT
Nearest AirportMerrill Field (0nm ESE)
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 172 P
Tail NumberN52950
Aircraft CategoryAir
DamageSubstantial
OperatorLand and Sea Aviation Alaska
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320 · Reciprocating · 180
Seats4
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 33 · First Class · None
Crew 2Age 31 · Third Class · None
Conditions
ConditionsVMC
LightDaylight
Wind20° @ 3 kt
Visibility10 sm
CeilingOvercast 6500 ft
Temperature / Dew Point66 F / 54
Altimeter30.02 inHg
Observation Time01:53
Weather SourceWFAC