MKC83FA201

NTSB accident investigation · Grieme Skybolt · Atchison, KS · August 25, 1983

Accident · Serious injuriesField investigationFinal report
Date
August 25, 1983, 12:20 local (17:20 UTC)
Place
Atchison, KS
Injuries
1 serious, 1 minor
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N798GGrieme Skybolt
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Case key
33350

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

On this page

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 engine power(total) - nonmechanicalApproach - vfr pattern - final approach
Fluid,fuel - starvationCause
Fuel boost pump selector position - improperPilot in commandCause
Cooling system,cowling - inadequateCause
Throttle/power control - improper use ofPilot in commandCause
Fuel system - overtemperatureCause
Fuel system,pump - blocked(total)Cause
Forced landingLanding - flare/touchdown
On ground/water encounter with terrain/waterLanding - flare/touchdown
Terrain condition - dirt bank/rising embankmentFactor
On ground/water encounter with terrain/waterLanding
Terrain condition - dirt bank/rising embankmentFactor

Analysis

The acrt crashed 200 ft short of the rwy when the engine failed to respond on a short final approach. The acft came to rest 100 ft below the rwy level. The landing gear was broken backward. The nose of the acrt was against a dirt bank. There was less than 1 inch of fuel in one corner of the fuel tank. All fuel lines were intact but the firewall fuel filter was broken and could have leaked. During testing it was capable of syphoning the fuel down to NE pint remaining in the tank when the soil under the position of the filter was dug into a strong smell of fuel was evident. The pilot said this acrt had a vapor lock problem before and a new fuel pump was installed. The fuel boost pump was off at the accident site but the throttle was full foward and the mixture control was full rich. The pilot had reduced power on the dowwind leg and reapplied it on final in an attempt to reach the rwy.

Aircraft

Registration
N798G
Reported as
Grieme Skybolt
Category
Airplane, amateur-built
Serial number
01
Airframe hours
110
Engine
Lycoming IO-540 G1C5, 290 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
William L. Grieme
Last inspection
Annual · June 15, 1983 · 8 hours before
Departed
K27 · Ft. Madison, IA
Airport
K59 · Amelia Earhart, runway 16, 3,000 × 50 ft, asphalt

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
46
Certificates
Airline transport, Commercial
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--no waivers/lim.
Seat
Rear
Flight hours
10,000 total · 140 in this make and model · 3,040 as pilot in command · 190 in the last 90 days · 4 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
230° at 13 knots
Visibility
6 statute miles
Lowest ceiling
None
Temperature
97 °F, dew point 66 °F
Altimeter
30.00 inHg