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February 16, 2002 · Grumman American AA-5B · N81072

Harwinton, CT

Overview

Report Status
Final with probable cause
Event Type
Accident
Date
February 16, 2002
Injury Outcomes
2 injuries (2 minor injuries)
Location
Harwinton, CT
Aircraft
Grumman American AA-5B
Tail Number
N81072
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
IAD02LA032

Prior to take-off, the pilot performed an engine run-up, and used a checklist to prepare the airplane for a normal take-off. The pilot said that the elevator trim was set to the take-off position, flight control continuity was performed, the flaps were retracted, and the engine run-up was normal. He then lined the airplane up on the runway, applied full power, and rotated at 65 knots. As the airplane began to climb, the pilot said that he tried to maintain 65 knots. When the airplane reached an altitude of approximately 40-50 feet above the ground, the left wing dropped and the stall horn came on. The stall horn remained on as the airplane turned to the left and collided with trees. Examination of the Gulfstream American AA-5B Tiger Pilot Operating Handbook (POH) revealed that for a normal take-off a pilot should, "accelerate to 50 KIAS before applying a light back pressure on the control wheel to lift off the nose wheel...When airborne, accelerate to the desired climb speed." According to the POH, the best angle of climb speed was 70 knots and normal climb out speed was 90 knots. Examination of the airplane revealed that there were no mechanical deficiencies.

NTSB Probable Cause

pilot's failure to obtain adequate airspeed during take-off, which resulted in an aerodynamic stall.

Full Narrative

On February 16, 2002, at 1710 eastern standard time, a Grumman American AA-5B, N81072, was substantially damaged when it collided with trees after take-off from Mountain Meadow Airport, Harwinton, Connecticut. The certificated private pilot and passenger sustained minor injuries. Visual meteorological conditions prevailed and no flight plan was filed for the personal flight conducted under 14 CFR Part 91. The pilot had flown into Mountain Meadow, where he and his wife enjoyed a late lunch. After lunch, the pilot prepared to fly back to his home airport in Bridgeport, Connecticut. He performed a pre-flight inspection and took-off on runway 19. In a written statement, he said: "Accelerated to 65 knots take-off roll, tracking the centerline. Ascended above tree line to approximately 40-50 feet agl. Unexpectedly felt substantial wing lift on right wing - entered left bank. Lowered nose and tried to level wings but bank continued. Stall warning sounded, plane turned sharply left. Wings came level, but plane heading for trees and no time to recover altitude. Hit trees on runway edge ~15 feet agl. Right wing sheared off - plane continued for about 50-60 feet into forest and spun around to the right. Came to rest on ground." In another written statement, the pilot said: "My plane lifted to an altitude just above the surrounding tree line. At this time my plane started to bank left out of my control. I was then unable to level the wings or lower the nose. The stall warning alarm then sounded and remained on. The plane started to lose altitude and proceed toward the trees to my left side." A Federal Aviation Administration (FAA) inspector interviewed the pilot. According to the inspector's record of conversation: "[Pilot] performed his preflight and taxied out towards runway 19. [Pilot] performed his engine run check and found no problems with the engine. [Pilot] lined up for take-off on runway 19 and applied full power. At 65 knots he rotated the aircraft into the air. Still trying to climb and maintain 65 knots, [pilot] said the left wing started to drop and the stall warning horn came on." The inspector asked the pilot if he tried to lower the nose and level the wings. The pilot responded, "Things happened so fast I thought I tried to lower the nose, but the stall horn continued to sound and before I knew it, the aircraft was approaching the trees on the left side of the runway." The inspector also asked the pilot if there were any problems with the engine. The pilot responded, "I had no problem with the engine at all." In a telephone conversation, the pilot said that it was not a gusty day and there were no storms in the area. He said the windsock was "limp", and no large aircraft had departed or landed prior to him taking off. Additionally, the pilot said he used the checklist to prepare the airplane for a normal take-off. He said the elevator trim was set to the take-off position, flight control continuity was confirmed, and the flaps were retracted. The FAA inspector performed an on-scene examination of the airplane. According to the inspector, the airplane collided with trees in a flat attitude, and came to rest on it's belly about 150 feet from the runway. The right wing had separated from the airplane and the left wing exhibited leading edge impact damage. The engine was found broken off its mounts and had separated from the airplane. Control continuity was established for all flight control surfaces, and no mechanical deficiencies were noted. The pilot reported a total of 82.8 flight hours, of which 15.1 hours were in make and model. He also reported that there were no mechanical deficiencies. Runway 19 was a 3,420-foot long and 45-foot wide asphalt runway. Examination of the Gulfstream American AA-5B Tiger Pilot Operating Handbook (POH), page 4-16 to 4-17, revealed that for a normal take-off the pilot should, "accelerate to 50 KIAS (58 MPH) before applying a light back pressure on the control wheel to lift off the nose wheel...When airborne, accelerate to the desired climb speed." According to the POH, the best angle of climb speed was 70 knots and normal climb out speed was 90 knots. Weather information reported at Hartford-Brainard Airport, 16 nautical miles east of the accident site, at 1653, included wind from 270 degrees at 5 knots, and clear skies.

Flight

Event TypeAccident
Event Time17:10 EST
Nearest AirportMountain Meadow (0nm)
Runway19
Runway Length3400 ft
Runway Width40 ft
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftGrumman American AA-5B
Tail NumberN81072
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-360-a4k · Reciprocating · 180
Seats4

People & Injuries

Injury Summary2 injuries (2 minor injuries)
Fatal0
Serious0
Minor2
Uninjured0
Total2
Crew 1Age 32 · Third Class · Minor

Conditions

ConditionsVMC
LightDaylight
Wind270° @ 5 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point54 / 41 C
Altimeter29.69 inHg
Observation Time21:53
Weather SourceWFAC

Appendix: Source Data