Atlas / NTSB / NYC75AN108

NTSB CAROL · Event

Event NYC75AN108

1975-05-20 PHILADELPHIA, Pennsylvania, United States Serious 1 aircraft Status: Completed

Aircraft involved

N1140W Bell 47J-2A Serious

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 47J-2A · N1140W

Damage

Substantial

Craft type

Balloon

Classification

Accident

Light condition

Dawn

Weather

VMC

Phase of flight

D1

Operator type

E

Airport

PHILADELPHIA INTL

Kind of flying

DM

Weather at impact

Sky

CLEAR

Aircraft history

Serial number

000000003118

Total time

899 hrs

Pilot

Certificate

Commercial

Total hours

1,187

Age

30

Probable cause (from PRE1982.MDB)

NR 6 CYL.ROCKER ARM SHAFT DISPLACED.

Investigator remarks

VALVE ROCKER SHAFT RETAINING PLATE NOT INSTALLED

Cause factors

68/C/D4 C
PERSONNEL INADEQUATE INSPECTION OF AIRCRAFT (MAINTENANCE PERSONNEL) Cause
74/C/AF C
POWERPLANT VALVE ASSEMBLIES Cause
88/C/CB C
MISCELLANEOUS ACTS,CONDITIONS IMPROPERLY INSTALLED Cause
64/B/25 B
PILOT IN COMMAND IMPROPER LEVEL OFF

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 1691. Source file NTSB_1975_3_1691.txt. Modern CAROL record on data.ntsb.gov ↗.

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