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Atlas/ Codebook/ NTSB Pre-1982

NTSB · Form 6120.4 Codebook

Pre-1982 Codebook.

The NTSB Form 6120.4 cause-factor codebook ships in the ct_Pre1982 table of the PRE1982.MDB archive — the canonical taxonomy for every accident from 1962 to 1981. 2,910 codes across 272 field types. Every coded triplet on a pre-1982 NTSB report (e.g. 74/C/KA) traces back to a category here.

02 /  All other field types

Methodology

Pre-1982 NTSB accident records used a coded-field schema rather than free-text narratives. Each field (cause factor, phase of flight, accident type, etc.) carried a numeric or letter code that referenced this codebook. After 1981 the agency switched to the modern free-text + structured Findings format we ingest from avall.mdb.

We render this codebook for two reasons: (1) it decodes mystery triplets like 74/C/KA on every pre-1982 NTSB event page, and (2) it's a standalone reference for researchers cross-checking historical accident data.

Source: ct_Pre1982 table of the FAA-distributed PRE1982.MDB archive at data.ntsb.gov/avdata/.