DEN00LA177

NTSB accident investigation · Cessna 340 · Broomfield, CO · September 23, 2000

Accident · No injuriesLimited investigationFinal report
Date
September 22, 2000, 22:00 local (Sep 23, 2000, 04:00 UTC)
Place
Broomfield, CO
Injuries
5 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N388SPCessna 340
Weather
Instrument (IMC) · Night/dark
Status
Completed · report April 6, 2001
Report
Approved by Office Director
FAA report
20000922015459A
Case key
50343

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 pilot landing the aircraft hard exceeding the design stress limits. Factors were: Low ceiling, freezing rain, dark night, excessive descent rate, and improper glide path.

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.

Hard landingLanding - flare/touchdown
Weather condition - low ceilingFactor
Weather condition - freezing rainFactor
Light condition - dark nightFactor
Proper descent rate - exceededPilot in commandFactor
Design stress limits of aircraft - exceededPilot in commandCause

Analysis

At the completion of an on-demand air taxi flight carrying four passengers, a ILS approach was conducted followed by a hard landing which damaged the landing gear, both wings, and the tips of the left propeller blades. Lighting conditions were dark night. Weather during the approach/landing was 200-foot obscuration, 1/2-mile visibility in freezing drizzle and mist. The wind was from 360 degrees magnetic heading at 10 knots and the altimeter was 30.03 inches of mercury. The recorded temperature and dew point were both 34 degrees Fahrenheit.

Factual narrative

On September 22, 2000, at 2200 mountain daylight time, a Cessna 340, N388SP, operated by Star West Aviation, sustained substantial damage when it was involved in a hard landing at Jefferson County Airport, Broomfield, Colorado. The commercial pilot and the four passengers were not injured. The flight was an on-demand air taxi flight operating under Title 14 CFR Part 135 and an IFR flight plan was filed. Night instrument meteorological conditions prevailed for this passenger flight, which originated from Rock Springs, Wyoming, at 2030.

According to the pilot, at the conclusion of an instrument landing system approach, he made a hard landing. The left main tire was blown, the main struts were flat, the upper and lower skin around both wing roots was rippled, and the tips of the left propeller blades were damaged. The damage was discovered during post flight inspection after the aircraft was parked on the ramp.

Jefferson County Airport recorded weather at the time of the accident was 200-foot sky obscured, visibility 1/2 mile with freezing drizzle and mist. The wind was from 360 degrees magnetic heading at 10 knots and the altimeter was 30.03 inches of mercury. The recorded temperature and dew point were both 34 degrees Fahrenheit.

Aircraft

Registration
N388SP
Reported as
Cessna 340
Category
Airplane
Serial number
0337
Airframe hours
3,488
Engine
Continental 520N, 310 horsepower, reciprocating
Damage
Substantial damage
Flight
Part 135
Operator
Star West Aviation
Registered owner
Spur Aircraft, LLC
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · September 10, 2000 · 15 hours before
Departed
RKS · Rock Springs, WY
Destination
BJC
Flight plan
IFR
Airport
BJC · Jefferson County, runway 29R, 9,000 × 100 ft, asphalt

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
32
Certificates
Commercial, Airline transport
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--no waivers/lim.
Seat
Left
Flight hours
2,863 total · 157 in this make and model · 2,598 as pilot in command · 320 in the last 90 days · 102 in the last 30 days · 4 in the last 24 hours

Weather

Conditions
Instrument (IMC) · Night/dark
Wind
360° at 10 knots
Visibility
0.5 statute miles
Lowest ceiling
200 ft
Temperature
34 °F, dew point 34 °F
Altimeter
30.00 inHg
Observed at
BJC, 1 nm away

Docket · 2

The files NTSB released with the investigation on February 1, 2001, on NTSB’s docket system: statements, records, photos and specialists’ reports. 398 KB in all.

FAA reports on this event · 1

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