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NTSB Report
June 9, 1984 · Douglas C-118A · N4206L
Deadhorse, AK
Overview
Report Status
Preliminary report
Event Type
Accident
Date
June 9, 1984
Injury Outcomes
No injuries (3 uninjured)
Location
Deadhorse, AK
Aircraft
Douglas C-118A
Tail Number
N4206L
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ANC84LA086
THE ACFT STRUCK A NON-DIRECTIONAL RADIO BEACON TOWER WHILE ON AN ILS DME RWY 05 INSTRUMENT APPROACH TO THE KUPARAK OIL FIELD AIRPORT. INVESTIGATION REVEALED THAT WX ISSUED TO THE ACFT INCLUDED AN INDEFINATE 200 FT SKY OBSCURED CONDITION & VISIBILITY OF 1 1/4 MILES. BOTH THE CAPTAIN & CO-PLT STATED THAT THEY COULD SEE THE OTHER END OF THE RWY. THE DECISION HEIGHT FOR THE APPROACH IS 316 FT MSL; THE ANTENNA HEIGHT WAS 35 FT, AT THIS POINT THE ACFT SHOULD BE 250 FT ABOVE THE GROUND AND OVER THE NON-DIRECTIONAL BEACON TOWER. INVESTIGATION DID REVEAL THAT THE TOWER USED TO BE LOCATED 2800 FT OFF THE APPROACH END OF RWY 05, BUT WAS MOVED TO 1775 FT FROM THE APPROACH END OF RWY 05. EXISTING APPROACH PLATES DID NOT DISPLAY THE NEW LOCATION OF THE ANTENNA OR THE FACT THAT THE ANTENNA WAS ONE FT HIGHER THAN THE MAXIMUM AUTHORIZED BY THE FCC.
Full Narrative
THE ACFT STRUCK A NON-DIRECTIONAL RADIO BEACON TOWER WHILE ON AN ILS DME RWY 05 INSTRUMENT APPROACH TO THE KUPARAK OIL FIELD AIRPORT. INVESTIGATION REVEALED THAT WX ISSUED TO THE ACFT INCLUDED AN INDEFINATE 200 FT SKY OBSCURED CONDITION & VISIBILITY OF 1 1/4 MILES. BOTH THE CAPTAIN & CO-PLT STATED THAT THEY COULD SEE THE OTHER END OF THE RWY. THE DECISION HEIGHT FOR THE APPROACH IS 316 FT MSL; THE ANTENNA HEIGHT WAS 35 FT, AT THIS POINT THE ACFT SHOULD BE 250 FT ABOVE THE GROUND AND OVER THE NON-DIRECTIONAL BEACON TOWER. INVESTIGATION DID REVEAL THAT THE TOWER USED TO BE LOCATED 2800 FT OFF THE APPROACH END OF RWY 05, BUT WAS MOVED TO 1775 FT FROM THE APPROACH END OF RWY 05. EXISTING APPROACH PLATES DID NOT DISPLAY THE NEW LOCATION OF THE ANTENNA OR THE FACT THAT THE ANTENNA WAS ONE FT HIGHER THAN THE MAXIMUM AUTHORIZED BY THE FCC.
Flight
Event TypeAccident
Event Time17:12 AKDT
Nearest AirportKUPARAK (6nm SW)
Runway5
Runway Length6000 ft
Runway Width130 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftDouglas C-118A
Tail NumberN4206L
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 121
Engines4
Engine TypeReciprocating
Engine DetailsP&W · R-2800CB16/17 · Reciprocating · 2400
Seats96
People & Injuries
Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 36 · First Class
Conditions
ConditionsIMC
LightDaylight
Wind260° @ 4 kt
Visibility1 sm
Ceiling200 ft
Temperature / Dew Point36 C / 36 C
Altimeter30.00 inHg
Weather SourceWIT