SEA08LA066

NTSB accident investigation · Grumman American AA-5A · Benson, AZ · November 11, 2007

Accident · No injuriesLimited investigationFinal report
Date
November 11, 2007, 12:30 local (19:30 UTC)
Place
Benson, AZ
Injuries
4 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N9592UGrumman American AA-5A
Weather
Visual (VMC) · Day
Status
Completed · report August 28, 2008
Report
Approved by Office Director
Parties
Federal Aviation Administration
FAA report
20071111831449A
Case key
67421

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 inadequate compensation for wind conditions, and his failure to maintain sufficient airspeed to avoid a stall. Contributing to the accident was a variable tailwind.

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 - in flightLanding - flare/touchdown
Weather condition - variable windFactor
Weather condition - tailwindFactor
Compensation for wind conditions - inadequatePilot in commandCause
Airspeed(vs) - not maintainedPilot in commandCause
Stall/mush - inadvertentPilot in commandCause
In flight collision with terrain/waterDescent - uncontrolled
Terrain condition - rough/uneven

Analysis

The pilot flew over the airport to check the wind, and determined the wind was out of the west. He flew a traffic pattern for runway 28. On final approach, he extended full flaps, and said he established an airspeed of 75 mph. Approximately 20 feet above the runway, the stall horn came on, and the airspeed had dropped to 60 mph. He added power, but the airplane drifted to the left, and landed off the runway in rough terrain. The pilot said the landing was hard, and the airplane bounced and skidded to a stop. The airplane's nose and left main landing gear were separated from the fuselage, and the surfaces of both wings were wrinkled. A witness at the airport said that the airplane's final approach to runway 28 was unusually low, flat and very fast. Additionally, he said the wind appeared to be from 140 to 150 degrees at approximately 8 knots and gusting to 13 knots. The pilot said that after he got out of the airplane he noticed that the wind was from the east, and a short time later the windsock had shifted back to a westerly direction again.

Factual narrative

On November 11, 2007, approximately 1230 mountain standard time, a Grumman American AA-5A, N9592U, was substantially damaged when it landed hard and impacted irregular terrain at Benson Municipal Airport (E95), Benson, Arizona. The private pilot and his three passengers were not injured. Valley Aircraft Restoration Society was operating the airplane under Title 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed for the personal, cross-country flight, which originated from Chandler, Arizona, about 1 hour 20 minutes before the accident. No flight plan had been filed.

The pilot said that he flew over the runway to check the wind conditions by looking at the windsock. It appeared to him that the wind was out of the west, and he decided to land on runway 28. On final approach, he extended full flaps and noted that the airspeed was at 75 miles per hour. Approximately 20 feet above the runway, the stall horn came on and the airspeed had dropped to 60 miles per hour. He added power, but the airplane drifted to the left and landed off the runway in rough terrain. The pilot said the landing was hard, and the airplane bounced and skidded to a stop. The airplane's nose and left main landing gear were separated from the fuselage and the surfaces of both wings were wrinkled.

A witness at the airport said that the airplane's final approach to runway 28 was unusually low, flat and very fast. Additionally, he said the wind appeared to be from 140 to 150 degrees at approximately 8 knots and gusting to 13 knots. The pilot said that after he got out of the airplane he noticed that the wind was from the east and a short time later the windsock had shifted back to a westerly direction again.

Aircraft

Registration
N9592U
Reported as
Grumman American AA-5A
Category
Airplane
Serial number
AA5A-0092
Airframe hours
1,737
Engine
Lycoming O-320-E2G, 150 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Valley Aircraft Restoration Society
Airworthiness certificate
Standard, Normal
Last inspection
Annual · November 1, 2007 · 2 hours before
Departed
FFZ · Mesa, AZ
Destination
E95 · Benson, AZ
Airport
E95 · Benson Municipal Airport, runway 28, 4,000 × 75 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
44
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Last flight review
December 1, 2005
Seat
Left
Flight hours
127 total · 35 in this make and model · 53 as pilot in command · 2 in the last 90 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
240° at 6 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
72 °F, dew point 32 °F
Altimeter
29.79 inHg
Observed at
FHU, 24 nm away

FAA reports on this event · 1

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