Atlas / NTSB / UNK64X3876

NTSB CAROL · Event

Event UNK64X3876

1964-09-08 ELKADER, Iowa, United States None 1 aircraft Status: Completed

Registry · N7611B

FAA Aircraft Registry record.

Make / Model

BEECH C23

Engine

LYCOMING O&VO-360 SER (180 hp)

Seats / Engines

4 seats · 1 engine

Last airworthiness date

19720724

ADS-B equipped

Yes — Mode-S AA47BC

Registrant of record

CASON THADDEUS D

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

N7611B BEECHCRAFT T34 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

BEECHCRAFT T34 · N7611B

Damage

Substantial

Craft type

Airplane

Classification

Accident

Light condition

Dawn

Weather

VMC

Phase of flight

D1

Operator type

L

Kind of flying

B0

Weather at impact

Sky

CLEAR

Aircraft history

Total time

3,455 hrs

Pilot

Certificate

Commercial

Total hours

3,300

Age

36

Probable cause (from PRE1982.MDB)

ANKSHAFT REWORKED BY LOCAL UNAPPROVED AGENCY.

Investigator remarks

FAILURE OF CRANKSHAFT FORWARD OF #3 CRANKPIN- CR

Cause factors

74/C/AB C
POWERPLANT CRANKSHAFT Cause
88/C/95 C
MISCELLANEOUS ACTS,CONDITIONS MATERIAL FAILURE Cause
68/C/D1 C
PERSONNEL IMPROPER MAINTENANCE (OWNER PERSONNEL) Cause
68/C/D5 C
PERSONNEL INADEQUATE INSPECTION OF AIRCRAFT (OWNER-PILOT) 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 3 2917. Source file NTSB_1964_3_2917.txt. Modern CAROL record on data.ntsb.gov ↗.

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