Atlas / NTSB / IAD75DIA19

NTSB CAROL · Event

Event IAD75DIA19

1975-04-18 BOWIE, Maryland, United States None 1 aircraft Status: Completed

Aircraft involved

N420MC Bell 47G4 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 47G4 · N420MC

Damage

Substantial

Craft type

Balloon

Classification

Accident

Light condition

Dawn

Weather

VMC

Phase of flight

D6

Operator type

Business

Kind of flying

B0

Weather at impact

Sky

CLEAR

Aircraft history

Serial number

000000003366

Total time

900 hrs

Pilot

Certificate

Commercial — instrument

Total hours

1,230

Age

50

Probable cause (from PRE1982.MDB)

K GND.

Investigator remarks

HARD LNDG,PULLED BACK ON CYCLIC TAIL ROTOR STRUC

Cause factors

88/C/85 C
MISCELLANEOUS ACTS,CONDITIONS SIMULATED CONDITIONS Cause
64/B/49 B
PILOT IN COMMAND MISJUDGED SPEED AND ALTITUDE
64/B/23 B
PILOT IN COMMAND IMPROPER OPERATION OF FLIGHT CONTROLS

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 2253. Source file NTSB_1975_3_2253.txt. Modern CAROL record on data.ntsb.gov ↗.

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