Atlas / NTSB / SEA78FYE11

NTSB CAROL · Event

Event SEA78FYE11

1978-03-06 MONTESANO, Washington, United States None 1 aircraft Status: Completed

Registry · N100LM

FAA Aircraft Registry record.

Make / Model

HILLER UH-12E

TCDS

4H11 · SIAM HILLER HOLDINGS INC

Engine

ALLISON 250-C20 SER (420 hp)

Seats / Engines

4 seats · 1 engine

Last airworthiness date

19910108

ADS-B equipped

Yes — Mode-S A005BA

Registrant of record

HADDOCK FLYING SERVICE INC

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

N100LM HILLER ACFT UH-12E 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

HILLER ACFT UH-12E · N100LM

Damage

Substantial

Craft type

Balloon

Classification

Accident

Light condition

Dawn

Weather

VMC

Phase of flight

DC

Operator type

Public use

Kind of flying

CY

Weather at impact

Sky

CLEAR

Wind

225° / 8 kt

Temp

60° F

Aircraft history

Serial number

000000001583

Total time

2,188 hrs

Pilot

Certificate

Commercial

Total hours

2,925

Age

36

Probable cause (from PRE1982.MDB)

FAILED. LND ON HILL SIDE.

Investigator remarks

CARRYING CEDAR BLOCKS. 2ND STAGE REDUCTION GEAR

Cause factors

78/C/BI C
ROTORCRAFT MAIN ROTOR INTERMEDIATE GEARS Cause
88/C/95 C
MISCELLANEOUS ACTS,CONDITIONS MATERIAL FAILURE Cause
83/K/F K
TERRAIN ROUGH/UNEVEN Joint factor
88/L/24 L
MISCELLANEOUS ACTS,CONDITIONS JETTISONED LOAD

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 0555. Source file NTSB_1978_3_0555.txt. Modern CAROL record on data.ntsb.gov ↗.

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