Event ANC70AA067

1970-03-28 ANNETTE ISL, Alaska, United States None 1 aircraft Status: Completed

Aircraft involved

N3156 Boeing 720B None

Historical record (pre-1982)

NTSB recorded this accident in the pre-1982 coded-field schema — structured fields rather than free-text narrative. Decoded codes use established NTSB single-letter taxonomies; cause factors remain verbatim pending the Form 6120.4 codebook lookup.

Aircraft

BOEING 720B · N3156

Damage

Substantial

Craft type

Airplane

Classification

Accident

Light condition

Dawn

Weather

VMC

Phase of flight

D0

Weather at impact

Sky

UNKNOWN/NOT REPORTED

Aircraft history

Serial number

000000018829

Total time

14,501 hrs

Pilot

Certificate

ZA (ZA)

Probable cause (from PRE1982.MDB)

OF FAN HUB FRM NR 1 ENG COULD NOT BE DTRMND.

Investigator remarks

DUE TO INSUFFICIENT EVIDENCE CAUSE OF SEPARATION

Cause factors

74/C/KA C
POWERPLANT POWERPLANT FAILURE FOR UNDETERMINED REASONS Cause
88/L/49 L
MISCELLANEOUS ACTS,CONDITIONS SEPARATION IN FLIGHT

Decoded against the NTSB Form 6120.4 cause-factor codebook (ct_Pre1982 table). Each row shows the raw triplet, modifier (Cause / Factor / etc.), category, and specific code.

Source: NTSB pre-1982 historical archive. Docket 1 0055. Source file NTSB_1970_1_0055.txt. Modern CAROL record on data.ntsb.gov ↗.

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