Atlas / NTSB / SEA81FYE15

NTSB CAROL · Event

Event SEA81FYE15

1981-01-10 OLYMPIA, Washington, United States None 1 aircraft Status: Completed

Aircraft involved

N6651P Piper PA-24 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

PIPER PA-24 · N6651P

Damage

Substantial

Craft type

Airplane

Classification

Accident

Light condition

Dawn

Weather

VMC

Phase of flight

D1

Operator type

D

Kind of flying

B0

Weather at impact

Sky

CLEAR

Temp

40° F

Aircraft history

Serial number

0000024-1774

Total time

2,700 hrs

Pilot

Certificate

Flight instructor (CFI)

Total hours

3,000

Age

44

Probable cause (from PRE1982.MDB)

ITRIDING TEMPS WERE USED.LOWERED CORE HARDNESS.

Investigator remarks

DRNG RE-NITRIDING,TEMPS EXCEEDING NRML FACTORY N

Cause factors

68/A/D0 A
PERSONNEL IMPROPER MAINTENANCE (MAINTENANCE PERSONNEL) Cause — pilot/personnel action
74/C/AB C
POWERPLANT CRANKSHAFT Cause
88/C/36 C
MISCELLANEOUS ACTS,CONDITIONS FATIGUE FRACTURE Cause
84/L/E L
MISCELLANEOUS SMOKE IN COCKPIT

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 2730. Source file NTSB_1981_3_2730.txt. Modern CAROL record on data.ntsb.gov ↗.

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