Event UNK64X2939

1964-07-20 LAKE CITY, Colorado, United States None 1 aircraft Status: Completed

Aircraft involved

N73915 Bell 47G3B 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

BELL 47G3B · N73915

Damage

Substantial

Craft type

Balloon

Classification

Accident

Light condition

Dawn

Weather

VMC

Phase of flight

Takeoff — initial climb (C1)

Operator type

Personal/private

Kind of flying

CT

Weather at impact

Sky

CLEAR

Aircraft history

Total time

728 hrs

Pilot

Certificate

Commercial

Total hours

2,200

Age

44

Probable cause (from PRE1982.MDB)

PWR PLT-TURBO MALFUNCTN CAUSED BY HEAT EROSION.

Cause factors

84/C/J C
MISCELLANEOUS WRITTEN CAUSE Cause
83/K/F K
TERRAIN ROUGH/UNEVEN Joint factor
88/J/BA J
MISCELLANEOUS ACTS,CONDITIONS BINDING Joint cause
88/J/CI J
MISCELLANEOUS ACTS,CONDITIONS OVERHEATED Joint cause
88/J/CW J
MISCELLANEOUS ACTS,CONDITIONS WARPED Joint cause

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 2 0467. Source file NTSB_1964_2_0467.txt. Modern CAROL record on data.ntsb.gov ↗.

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