Atlas / NTSB / MKC76AK003

NTSB CAROL · Event

Event MKC76AK003

1975-07-04 PINE RIDGE, South Dakota, United States Minor 1 aircraft Status: Completed

Aircraft involved

N111RS Sikorsky S-55B Minor

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

SIKORSKY S-55B · N111RS

Damage

Substantial

Craft type

Balloon

Classification

Accident

Light condition

Dawn

Weather

VMC

Phase of flight

DC

Operator type

G

Kind of flying

DQ

Weather at impact

Sky

CLEAR

Temp

88° F

Aircraft history

Serial number

00000055-834

Total time

3,124 hrs

Pilot

Certificate

Commercial

Total hours

3,500

Age

35

Probable cause (from PRE1982.MDB)

FOUND.PLT CRASH LND ON SIDE OF HILL,NO COLLECTIVE.

Investigator remarks

PART FM MAIN RTR BLADE SEPARATED IN FLT AND NOT

Cause factors

78/C/AA C
ROTORCRAFT MAIN ROTOR BLADES Cause
88/C/95 C
MISCELLANEOUS ACTS,CONDITIONS MATERIAL FAILURE Cause
83/B/F B
TERRAIN ROUGH/UNEVEN
88/L/49 L
MISCELLANEOUS ACTS,CONDITIONS SEPARATION IN FLIGHT

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 3317. Source file NTSB_1975_3_3317.txt. Modern CAROL record on data.ntsb.gov ↗.

Beyond the agency record

Search this event elsewhere.

Pre-filled searches into the sources where news + community discussion of aviation events lives. External sources are reported, not agency. Treat them as signal that something happened, not as fact about what happened.

TallyAero Live Wire Aviation press

Entity-clustered aviation events in the press — last 24 hr + 30-day archive.

NTSB CAROL Agency ↗

Official agency record + docket.

NTSB Docket Agency ↗

Investigative docket: factual reports, photos, transcripts.

Aviation Safety Network Aviation press ↗

Long-running aviation incident database (Flight Safety Foundation).

Kathryn's Report Aviation press ↗

Community NTSB synthesis blog — often has photos and witness reports.

Aviation Herald Aviation press ↗

Gold-standard aviation incident blog.