Atlas / NTSB / SEA75DYA34

NTSB CAROL · Event

Event SEA75DYA34

1975-03-18 DUBOIS, Idaho, United States None 1 aircraft Status: Completed

Registry · N11RA

FAA Aircraft Registry record.

Make / Model

ROBINSON HELICOPTER R44

TCDS

H11NM · ROBINSON HELICOPTER CO

Engine

LYCOMING O-540-F1B5 (260 hp)

Seats / Engines

4 seats · 1 engine

Last airworthiness date

20190416

ADS-B equipped

Yes — Mode-S A02B52

Registrant of record

BIFFLE GREGORY

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

N11RA Cessna T337 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

CESSNA T337 · N11RA

Damage

Substantial

Craft type

Airplane

Classification

Accident

Light condition

Dawn

Weather

IMC

Phase of flight

D1

Operator type

Personal/private

Kind of flying

B0

Weather at impact

Sky

OVERCAST

Temp

30° F

Aircraft history

Serial number

000000001143

Total time

1,435 hrs

Pilot

Certificate

Commercial

Total hours

8,000

Age

40

Probable cause (from PRE1982.MDB)

ENG.UN MAINTAIN ALT DUE ICING.LND IN DEEP SNOW.

Investigator remarks

LINE TO FUEL FLOW GAUGE FAILED.PLT SHUT DWN REAR

Cause factors

74/C/KA C
POWERPLANT POWERPLANT FAILURE FOR UNDETERMINED REASONS Cause
83/K/B K
TERRAIN SNOW-COVERED Joint factor
74/L/J3 L
POWERPLANT FUEL FLOW INDICATOR
88/L/36 L
MISCELLANEOUS ACTS,CONDITIONS FATIGUE FRACTURE
82/K/F K
WEATHER ICING CONDITIONS-INCLUDES SLEET,FREEZING RAIN,ETC. Joint factor
64/3/44 3
PILOT IN COMMAND SPONTANEOUS-IMPROPER ACTION Subordinate · 3

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 4139. Source file NTSB_1975_3_4139.txt. Modern CAROL record on data.ntsb.gov ↗.

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