Skip to content

Atlas / NTSB / OAK66D0275

NTSB CAROL · Event

Event OAK66D0275

1966-04-10 MAMMOTH LKS, California, United States None 1 aircraft Status: Completed

Registry · N79390

FAA Aircraft Registry record.

Make / Model

MOONEY M20C

Year of manufacture

1965 · 1 years old at event

Engine

LYCOMING O&VO-360 SER (180 hp)

Seats / Engines

4 seats · 1 engine

Last airworthiness date

19650121

ADS-B equipped

Yes — Mode-S AAC6D6

Registrant of record

GRASS LOUIS HUMBERTO III

Source: FAA Aircraft Registry (releasable master file).

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

MOONEY 20C · N79390

Damage

Substantial

Craft type

Airplane

Classification

Accident

Light condition

Dawn

Weather

VMC

Phase of flight

Takeoff — initial climb (C1)

Operator type

Personal/private

Airport

LONG VALLEY

Kind of flying

B0

Weather at impact

Sky

CLEAR

Wind

360° / 10 kt

Temp

59° F

Pilot

Certificate

Commercial

Total hours

5,000

Age

37

Cause factors

  • 64/A/16 A
    PILOT IN COMMAND FAILED TO OBTAIN/MAINTAIN FLYING SPEED Cause — pilot/personnel action
  • 82/J/M J
    WEATHER DOWNDRAFT,UPDRAFTS 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 0828. Source file NTSB_1966_3_0828.txt. Modern CAROL record on data.ntsb.gov ↗.