SEA91LA040

NTSB accident investigation · Swearingen SA-227 · Kalispell, MT · December 31, 1990

Accident · No injuriesLimited investigationFinal report
Date
December 31, 1990, 10:30 local (17:30 UTC)
Place
Kalispell, MT
Injuries
15 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N385PHSwearingen SA-227
Weather
Instrument (IMC) · Day
Status
Completed · report November 9, 1992
Report
Approved by Office Director
FAA report
19901231061889A
Case key
41379

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

The NTSB’s determination of the probable cause, and any contributing factors.

The flight crew's inablity to maintain directional control after landing in snow-depth conditions that had been erroneously reported as being within operating limitations.

Analysis

The crew of the SA-227 commuter airliner lost dirctional control after landing in snow that was reportedly between five and ten inches deep. The crew had requested a snow-depth report, which was relayed to them by an airport snowplow operator, through the airline's operations personnel. The snow depth had been reported as one inch at that time. The aircraft drifted off the right side of the runway, causing substantial damage to the fuselage.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Loss of control - on ground/waterLanding - roll
Terrain condition - snow coveredFactor
Directional control - not maintainedPilot in commandCause
Airport facilities,runway/landing area condition - not maintainedFactor
Airport snow removal - misjudgedAirport personnelFactor
Procedure inadequateAirport personnelCause

Aircraft

Registration
N385PH
Reported as
Swearingen SA-227
Category
Airplane
Serial number
AC-595
Engine
Garrett TPE-331-11U, 1,000 horsepower, turbo prop
Damage
Substantial damage
Flight
Part 135
Operator
Horizon Airlines
Registered owner
Unknown
Departed
GEG · Spokane, WA
Destination
FCA · Kalispell, MT
Flight plan
IFR
Airport
FCA · Glacier Int'L, runway 2, 8,000 × 150 ft, asphalt

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
40
Certificate
Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--w/ waivers/lim
Flight hours
6,500 total · 1,230 in this make and model · 5,950 as pilot in command · 150 in the last 90 days · 50 in the last 30 days · 5 in the last 24 hours

Weather

Conditions
Instrument (IMC) · Day
Wind
230° at 5 knots
Visibility
1 statute miles
Lowest ceiling
600 ft
Temperature
18 °F, dew point 16 °F
Altimeter
29.00 inHg
Observed at
FCA

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.