NTSB Identification: DEN88FA061.
The docket is stored on NTSB microfiche number 35814.
Scheduled 14 CFR (D.B.A. UNITED EXPRESS )
Accident occurred Tuesday, February 02, 1988 in DURANGO, CO
Probable Cause Approval Date: 04/25/1989
Aircraft: CONVAIR 580, registration: N5808
Injuries: 2 Minor,2 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

AFTER MAKING AN IFR APPROACH, THE PILOT MADE A GO-AROUND BECAUSE HE WAS BLINDED BY THE REFLECTION OF THE LANDING/TAXI LIGHTS AGAINST THE FALLING SNOW. THE PILOT LANDED THE AIRCRAFT AFTER THE SECOND APPROACH. THE PILOT SAID HE SENSED THE AIRCRAFT DRIFTING TO THE LEFT AND HE TRIED TO CORRECT, BUT IT COLLIDED WITH A SNOW BANK. THE INVESTIGATION DISCLOSED NO EVIDENCE OF AIRCRAFT HYDROPLANING OR SKIDDING. AIRPORT MANAGEMENT ELECTED TO DELAY PLOWING THE RUNWAY FOR FEAR OF IT FREEZING OVER. PASSENGERS CLAIMED THERE WAS 2-3 INCHES OF SNOW ON TOP OF A 3/4- INCH LAYER OF SLUSH. FURTHER INVESTIGATION REVEALED THAT THE RUNWAY LIGHTS WERE OF VARIOUS INTENSITIES BECAUSE SOME UNAPPROVED LIGHT BULBS OF DIFFERENT AMPERAGE WERE USED. THE RUNWAY WAS NOT EQUIPPED WITH CENTERLINE LIGHTING. THE PAINTED WHITE CENTERLINE STRIPE WAS COVERED BY SNOW AND SLUSH.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

AIRPORT SNOW REMOVAL..INADEQUATE..AIRPORT PERSONNEL

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

PROPER ALIGNMENT..NOT MAINTAINED..PILOT IN COMMAND


Contributing Factors

AIRPORT FACILITIES,RUNWAY MARKING..FOREIGN SUBSTANCE COVERED


Contributing Factors

AIRPORT FACILITIES,RUNWAY/LANDING AREA CONDITION..SNOW COVERED


Contributing Factors

AIRPORT FACILITIES,RUNWAY/LANDING AREA CONDITION..SLUSH COVERED



Contributing Factors

AIRPORT FACILITIES,CENTERLINE LIGHTS..UNAVAILABLE


Contributing Factors

AIRPORT FACILITIES,RUNWAY EDGE LIGHTS..UNAPPROVED


Contributing Factors

LIGHT CONDITION..DARK NIGHT

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