NTSB Identification: ANC83FAG05.
The docket is stored on NTSB microfiche number 20423.
Accident occurred Sunday, March 13, 1983 in CHUGIAK, AK
Aircraft: PIPER PA 28-140, registration: N1642J
Injuries: 4 Minor.

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.

THE FLT ORIGINATED AT ANCHORAGE, AK AT APRX 1400 AST. WHILE FLYING IN THE VICINITY OF KNIK GLACIER, SOME SHEEP WERE OBSERVED & THE PLT CIRCLED IN THE AREA 2 TIMES. DURING THE 2ND TURN, THE ENGINE BEGAN RUNNING ERRATICALLY. REPORTEDLY, THE PLT APPLIED CARBURETOR HEAT & THE ENGINE SMOOTHED OUT. HE THEN DIVERTED TO PALMER WHERE THE ENGINE WAS CHECKED & OPERATED NORMALLY. THEREFORE, HE DEPARTED PALMER AND CONTINUED THE FLIGHT TO WASILLA, AK WHERE HE LANDED FOR A COFFEE BREAK. AT APRX 1550, THEY DEPARTED WASILLA FOR THE RETURN FLT TO ANCHORAGE. THE PLT REPORTED THAT HE CLIMBED TO 3500 FT MSL, & AFTER CROSSING THE KNIK ARM, PROCEEDED ALONG THE MTNS. IN THE VICINITY OF PETER'S CREEK, THE ENGINE BEGAN RUNNING ROUGH. THE PLT REPORTED HE APPLIED CARBURETOR HEAT, BUT THE ENGINE RAN ROUGHER, SO HE DECONTINUED ITS USE. SUBSEQUENTLY, THE ACFT LOST AIRSPEED & THE PLT MADE A CRASH LANDING. THE TEMP & DEW POINT WERE 40 & 23 DEG, RESPECTIVELY. ACCORDING TO ICING PROBABILITY CHARTS. VISIBLE ICING WAS PROBABLE AT CRUISE OR GLIDING POWER.

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

CARBURETOR HEAT..IMPROPER USE OF..PILOT IN COMMAND

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

FUEL SYSTEM,CARBURETOR..ICE


Contributing Factors

TERRAIN CONDITION..MOUNTAINOUS/HILLY


Contributing Factors

WEATHER CONDITION..CARBURETOR ICING CONDITIONS

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