CHI08CA136

NTSB accident investigation · Schleicher AS-K13 · Gregory, MI · May 10, 2008

Accident · Serious injuriesData collectionFinal report
Date
May 10, 2008, 15:50 local (19:50 UTC)
Place
Gregory, MI
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N24BSSchleicher AS-K13
Defining event
Initial climb: Loss of control in flight
Weather
Visual (VMC) · Day
Status
Completed · report June 30, 2008
Report
Approved by Office Director
Parties
Federal Aviation Administration - Detriot FSDO
Case key
68117

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's failure to adequately secure his handheld radio prior to takeoff, which resulted in a restriction of the flight control stick and loss of control. Contributing to the accident was the stall/mush flight condition encountered after the glider released from the towline.

Findings · 4

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Planning/preparation: flight planning/navigationPersonnel issues › Task performance · PilotAll aircraft: 179 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotAll aircraft: 9,295 casesProbable cause
Flight control system: control column sectionAircraft › Aircraft systems · Not specifiedAll aircraft: 21 casesProbable cause
Performance/control parameters: airspeedAircraft › Aircraft oper/perf/capability · Not attained/maintainedAll aircraft: 1,681 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The glider pilot reported that before hooking-up to the tow plane he reviewed the preflight checklist and verified that the flight controls were connected and unobstructed. The initial takeoff roll was normal with the glider becoming airborne prior to the tow plane. The glider pilot applied forward stick pressure to remain in ground effect and in proper position relative to the tow plane, which was still accelerating on its takeoff roll. After the tow plane became airborne the glider began to climb above proper tow position. The glider pilot stated that he "could not push the stick all the way forward to lower the nose" and the glider continued to climb out of tow position. The glider pilot released from the towline when he no longer had the tow plane in sight. After releasing from the towline, the glider resumed a level pitch attitude and began to decelerate. The pilot selected full nose down trim, in response to his limited pitch control. The glider continued to decelerate and subsequently landed hard on the turf runway. The main landing gear and aft fuselage tubular support structure was substantially damaged during the hard landing. Both wingtips were damaged and there were several fabric tears on the left wing and fuselage. After exiting the glider, the pilot found his handheld communication radio on the cockpit floor. The pilot said that during takeoff the radio must have fallen off his seat onto the cockpit floor, restricting the movement of the control stick. The pilot reported that the accident might have been prevented if the glider had a method to secure a handheld radio and the preflight checklists included a task to identify if there were any unrestrained items in the cockpit area.

Factual narrative

The glider pilot reported that before hooking-up to the tow plane he reviewed the preflight checklists and verified that the flight controls were connected and unobstructed. The initial takeoff roll was normal with the glider becoming airborne prior to the tow plane. The glider pilot applied forward stick pressure to remain in ground effect and in proper position relative to the tow plane, which was still accelerating on its takeoff roll. After the tow plane became airborne the glider began to climb above proper tow position. The glider pilot stated that he "could not push the stick all the way forward to lower the nose" and the glider continued to climb out of tow position. The glider pilot released from the towline when he no longer had the tow plane in sight. After releasing from the towline, the glider resumed a level pitch attitude and began to decelerate. The pilot selected full nose down trim, in response to his limited pitch control. The glider continued to decelerate and subsequently landed hard on the turf runway. The main landing gear and aft fuselage tubular support structure was substantially damaged during the hard landing. Both wingtips were damaged and there were several fabric tears on the left wing and fuselage. After exiting the glider, the pilot found his handheld communication radio on the cockpit floor. The pilot said that during takeoff the radio must have fell off his seat onto the cockpit floor, restricting the movement of the control stick. The pilot reported that the accident might have been prevented if the glider had a method to secure a handheld radio and the preflight checklists included a task to identify if there were any unrestrained items in the cockpit area.

Aircraft

Registration
N24BS
Reported as
Schleicher AS-K13
Category
Glider
Serial number
13003
Engine
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Sandhill Soaring Club, Inc.
Airworthiness certificate
Standard, Normal
Departed
69G · Gregory, MI
Destination
69G · Gregory, MI
Airport
69G · Richmond Field Airport, runway 18, 2,471 × 100 ft, grass/turf

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
60
Injuries
Serious
Certificate
Student
Seat
Front
Flight hours
54 total · 5 in this make and model · 17 in the last 90 days · 5 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
200° at 6 knots
Lowest ceiling
None
Temperature
66 °F, dew point 32 °F
Altimeter
29.89 inHg
Observed at
OZW, 12 nm away