NTSB CAROL · Event
Event UNK64X1757
Aircraft involved
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
HILLER UH12L4 · N977C
Damage
Substantial
Craft type
Balloon
Classification
Accident
Light condition
Dawn
Weather
VMC
Phase of flight
DC
Operator type
K
Airport
HOLLISTER
Kind of flying
DB
Aircraft history
Total time
290 hrs
Pilot
Certificate
G7 (G7)
Total hours
64,833
Age
377
Probable cause (from PRE1982.MDB)
MENTAL TEST FLIGHT
Investigator remarks
TAIL ROTOR BLADES STRUCK TAIL BOOM DURING EXPERI
Cause factors
- 68/A/J2 A PERSONNEL POOR/INADEQUATE DESIGN Cause — pilot/personnel action
- 78/J/AB J ROTORCRAFT TAIL ROTOR BLADES Joint cause
- 75/J/AA J SYSTEMS BATTERIES 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
2 0268.
Source file
NTSB_1964_2_0268.txt.
Modern CAROL record on
data.ntsb.gov ↗.
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