NTSB CAROL · Event
Event ANC71DAG83
Registry · N4123D
FAA Aircraft Registry record.
Make / Model
HELIO H-391B
Year of manufacture
1957 · 14 years old at event
Engine
LYCOMING GO-435C&D SER (260 hp)
Seats / Engines
4 seats · 1 engine
Last airworthiness date
19570326
ADS-B equipped
Yes — Mode-S A4DE53
Registrant of record
THUN KARL J
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
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
HELIO H391B · N4123D
Damage
Substantial
Craft type
Airplane
Classification
Accident
Light condition
Dawn
Weather
VMC
Phase of flight
C0
Operator type
D
Airport
MERRILL FIELD
Kind of flying
B0
Weather at impact
Sky
CLEAR
Aircraft history
Serial number
000000000042
Total time
1,400 hrs
Pilot
Certificate
Commercial — instrument
Total hours
950
Age
48
Investigator remarks
IMPROPER TYPE OF TAIL WHEEL INSTALLED.
Cause factors
- 64/A/79 A PILOT IN COMMAND FAILED TO MAINTAIN DIRECTIONAL CONTROL Cause — pilot/personnel action
- 88/A/AD A MISCELLANEOUS ACTS,CONDITIONS UNAPPROVED MODIFICATION Cause — pilot/personnel action
- 68/A/D6 A PERSONNEL INADEQUATE MAINTENANCE AND INSPECTION Cause — pilot/personnel action
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 1203.
Source file
NTSB_1971_3_1203.txt.
Modern CAROL record on
data.ntsb.gov ↗.
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