Atlas / NTSB / CHI74FEP20

NTSB CAROL · Event

Event CHI74FEP20

1973-10-17 EAU CLAIRE, Wisconsin, United States None 1 aircraft Status: Completed

Registry · N8750R

FAA Aircraft Registry record.

Make / Model

HELIO H-391B

Engine

LYCOMING GO-435C&D SER (260 hp)

Seats / Engines

4 seats · 1 engine

Last airworthiness date

19620712

ADS-B equipped

Yes — Mode-S AC0B51

Registrant of record

DISCOVERY BAY AVIATION LLC

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

N8750R HELIO ACFT H-391B 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

HELIO ACFT H-391B · N8750R

Damage

Substantial

Craft type

Airplane

Classification

Accident

Light condition

Dawn

Weather

VMC

Phase of flight

Cruise — descent (EF)

Operator type

D

Airport

EAU CLAIRE

Kind of flying

B0

Weather at impact

Sky

UNKNOWN/NOT REPORTED

Wind

230° / 8 kt

Aircraft history

Serial number

000000000009

Total time

2,643 hrs

Pilot

Certificate

IA (IA)

Total hours

550

Age

38

Probable cause (from PRE1982.MDB)

L INITIATED GOARND HELD R RUDDER TOO LONG.

Investigator remarks

PLT HAD FLOWN 8 HRS IN LAST 24 HR PERIOD VEERED

Cause factors

64/C/23 C
PILOT IN COMMAND IMPROPER OPERATION OF FLIGHT CONTROLS Cause
64/C/79 C
PILOT IN COMMAND FAILED TO MAINTAIN DIRECTIONAL CONTROL Cause
88/K/94 K
MISCELLANEOUS ACTS,CONDITIONS OVERLOAD FAILURE Joint factor
88/L/62 L
MISCELLANEOUS ACTS,CONDITIONS PILOT FATIGUE

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 3405. Source file NTSB_1973_3_3405.txt. Modern CAROL record on data.ntsb.gov ↗.

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