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NTSB Report
May 9, 1992 · Cessna 185 · N1047F
Ruth Glacier, AK
Overview
Report Status
Probable Cause
Event Type
Accident
Date
May 9, 1992
Injury Outcomes
No injuries (10 uninjured)
Location
Ruth Glacier, AK
Aircraft
Cessna 185
Tail Number
N1047F
Operator
Douglas Geeting Aviation
Injuries
None
Aircraft Damage
Minor
NTSB Number
ANC92FA069
Both airplanes were on sightseeing flights at about 9,200 ft MSL. The pilot of the CE-172, N73813, stated that he was heading approximately northwest, looked at Mt. McKinley, and as he returned his gaze forward he saw the other airplane ahead and slightly higher before the collision. The pilot of the CE-185, N1047F, stated that she had just finished making a radio transmission indicating her position when some of the passengers saw the other airplane; she estimated the other airplane was flying in the opposite direction and slightly lower. The Alaska supplement in effect at the time of the occurrence stated that frequency 122.7 is designated for inter-aircraft communications in Denali Park, the area in which Mt. McKinley is located. The pilot of the CE-172 was not aware of the frequency. According to the pilot of the CE-185, the CE-172 blended in with the surrounding terrain which consisted of vertical granite walls.
NTSB Probable Cause
THE FAILURE OF THE PILOTS OF BOTH AIRPLANES TO MAINTAIN AN ADEQUATE VISUAL LOOKOUT. FACTORS WHICH CONTRIBUTED TO THE ACCIDENT WAS THE FAILURE OF THE PILOT OF THE CE-172 TO BECOME AWARE OF AND TO USE THE LISTED FREQUENCY FOR INTER AIRCRAFT COMMUNICATIONS, AND THE REDUCED VISUAL ACUITY OF THE CE-172 AGAINST THE SURROUNDING TERRAIN.
Full Narrative
BOTH AIRPLANES WERE ON SIGHTSEEING FLIGHTS AT ABOUT 9,200 FT MSL. THE PILOT OF THE CE-172, N73813, STATED THAT HE WAS HEADING APRX NORTHWEST, LOOKED AT MT. MCKINLEY, AND AS HE RETURNED HIS GAZE FORWARD HE SAW THE OTHER AIRPLANE AHEAD AND SLIGHTLY HIGHER BEFORE THE COLLISION. THE PILOT OF THE CE-185, N1047F, STATED THAT SHE HAD JUST FINISHED MAKING A RADIO TRANSMISSION INDICATING HER POSITION WHEN SOME OF THE PAX SAW THE OTHER AIRPLANE; SHE ESTIMATED THE OTHER AIRPLANE WAS FLYING IN THE OPPOSITE DIRECTION AND SLIGHTLY LOWER. THE ALASKA SUPPLEMENT IN EFFECT AT THE TIME OF THE OCCURRENCE STATED THAT FREQUENCY 122.7 IS DESIGNATED FOR INTER AIRCRAFT COMMUNICATIONS IN DENALI PARK, THE AREA IN WHICH MT. MCKINLEY IS LOCATED. THE PILOT OF THE CE-172 WAS NOT AWARE OF THE FREQUENCY. ACCORDING TO THE PILOT OF THE CE-185, THE CE-172 BLENDED IN WITH THE SURROUNDING TERRAIN WHICH CONSISTED OF VERTICAL GRANITE WALLS.
Flight
Event TypeAccident
Event Time10:50 AKDT
Nearest Airport0nm N
Runway0
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 185
Tail NumberN1047F
Aircraft CategoryAir
DamageMinor
OperatorDouglas Geeting Aviation
Operating RulePart 135
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-360-A4M · Reciprocating · 180 | Continental · IO-520-D · Reciprocating · 300
Seats6
People & Injuries
Injury SummaryNo injuries (10 uninjured)
Fatal0
Serious0
Minor0
Uninjured10
Total10
Crew 1Age 26 · Third Class
Crew 2Age 32 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility65 sm
CeilingNone
Temperature / Dew Point50 / 0 C
Altimeter30.00 inHg
Weather SourcePILO