CHI85FA344

NTSB accident investigation · Learjet 23 · Madison, WI · August 13, 1985

Accident · No injuriesField investigationFinal report
Date
August 13, 1985, 01:15 local (06:15 UTC)
Place
Madison, WI
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N61TSLearjet 23
Weather
Visual (VMC) · Night/dark
Status
Completed
Report
Approved by Office Director
FAA report
19850813056319A
Case key
12861

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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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/waterTakeoff - roll/run
Aircraft performance,hydroplaning condition - exceededFactor
Preflight planning/preparation - poorPilot in commandFactor
Judgment - poorPilot in commandFactor
Aborted takeoff - misjudgedPilot in commandCause
OverrunTakeoff - roll/run
Landing gear,nose gear assembly - buckledCause
Landing gear,main gear strut - buckledCause
On ground/water encounter with terrain/waterTakeoff - initial climb
Terrain condition - ditch
Terrain condition - water,glassy

Analysis

The plt elected to take off with a heavy loaded acft on the short rwy. The plt stated a loud noise was heard as the acft approached 80 KTS. The takeoff was aborted at 100 KTS. Hydroplaning was experienced and a loss of control occurred. The acft traveled off the departure end of the rwy were the left main gear collapsed. The acft came to rest with the nose in a water filled ditch.

Aircraft

Registration
N61TS
Reported as
Learjet 23
Category
Airplane
Serial number
23-029
Airframe hours
7,227
Engine
GE CJ-610-4, 2,850 lbs thrust, turbo jet
Damage
Substantial damage
Flight
Part 135
Registered owner
Connie Kalitta Services Inc.
Airworthiness certificate
Standard, Normal
Last inspection
Continuous airworthiness · August 12, 1985 · 79 hours before
Destination
IND · Indianapolis, IN
Flight plan
IFR
Airport
M5N · Dane County Regional, runway 31, 5,846 × 150 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
34
Certificate
Airline transport
Airplane ratings
Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--no waivers/lim.
Seat
Left
Flight hours
6,200 total · 1,200 in this make and model · 6,000 as pilot in command · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Night/dark
Wind
190° at 8 knots
Visibility
7 statute miles
Lowest ceiling
1,700 ft broken
Temperature
70 °F, dew point 66 °F
Altimeter
29.00 inHg
Observed at
MSN

FAA reports on this event · 1

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