Atlas / NTSB / MKC77FER09

NTSB CAROL · Event

Event MKC77FER09

1976-12-07 ST PAUL, Minnesota, United States None 1 aircraft Status: Completed

Aircraft involved

N4178B AERO COMDR 520 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

AERO COMDR 520 · N4178B

Damage

Substantial

Craft type

Airplane

Classification

Accident

Light condition

E

Weather

VMC

Phase of flight

Cruise — descent (EF)

Operator type

D

Airport

ST PAUL MUNI

Kind of flying

B0

Weather at impact

Sky

SCATTERED-ABOVE 1000 FEET

Wind

210° / 3 kt

Aircraft history

Serial number

000000520-85

Total time

3,502 hrs

Pilot

Certificate

Commercial — instrument

Total hours

453

Age

44

Probable cause (from PRE1982.MDB)

IOR TO LANDING.

Investigator remarks

RIGHT GEAR LIGHT DID NOT INDICATE GREEN LIGHT PR

Cause factors

64/A/39 A
PILOT IN COMMAND FAILED TO ASSURE THE GEAR WAS DOWN AND LOCKED Cause — pilot/personnel action
70/J/CM J
AIRFRAME GEAR LOCKING MECHANISM Joint cause
68/J/D0 J
PERSONNEL IMPROPER MAINTENANCE (MAINTENANCE PERSONNEL) Joint 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 3862. Source file NTSB_1976_3_3862.txt. Modern CAROL record on data.ntsb.gov ↗.

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