Accident Douglas DC-6B N861TA,

ASN Wikibase Occurrence # 324058

Date:	Friday 2 January 1998
Time:	15:26
Type:	Douglas DC-6B
Owner/operator:	Woods Air Fuel
Registration:	N861TA
MSN:	43522/229
Year of manufacture:	1952
Total airframe hrs:	46626 hours
Engine model:	Pratt & Whitney R-2800-CB16
Fatalities:	Fatalities: 0 / Occupants: 3
Aircraft damage:	Destroyed, written off
Category:	Accident
Location:	Nixon Fork Mine, AK - United States of America
Phase:	Take off
Nature:	Cargo
Departure airport:	Nixon Fork Mine, AK
Destination airport:	Palmer Municipal Airport, AK (PAQ/PAAQ)
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
At an indicated airspeed of 45 knots during the takeoff roll, ice formed between the inner and outer windshield panes, with the icing following the flow of heated air through the windshield. The crew's forward visibility was obscured, and the takeoff was aborted. The captain reported that the airplane drifted left into snow berms on the side of the 4200 feet long by 85 feet wide runway and caught fire.
The "DC-6 Airplane Operating Manual" used by two other companies states "...Certain combinations of temperature and humidity will cause moisture to condense from the air between the windshield panels and settle on the inner surfaces of the glass, obscuring vision. Once formed, anti-icing airflow with heater operation will be required to clear the panels." This language was not included in the Supplemental Type Certificate (STC) literature, nor in the flight handbook for the company operating the accident airplane.

PROBABLE CAUSE: "The ingestion of snow into the windshield anti-ice system, and the resulting obscured windshield which made runway alignment not possible. Factors associated with this accident were the cold windshield, the reduced performance of the windshield anti-ice because of the short taxi by the crew, and the insufficient information on the system provided by the manufacturer."

Accident investigation: