CHI99LA187

NTSB accident investigation · Grumman AA-5KB · Iowa City, IA · June 17, 1999

Accident · Minor injuriesLimited investigationFinal report
Date
June 17, 1999, 14:40 local (19:40 UTC)
Place
Iowa City, IA
Injuries
2 minor
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N4531RGrumman AA-5KB
Weather
Visual (VMC) · Day
Status
Completed · report November 22, 2000
Report
Approved by Office Director
FAA report
19990617045009A
Case key
46575

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 stalled the airplane. Factors included the instructor pilot's inadequate preflight briefing and improper in flight decision.

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.

In flight collision with terrain/waterLanding
Stall - inadvertentPilot in commandCause
Preflight planning/preparation - inadequatePilot in command(cfi)Factor
In-flight planning/decision - improperPilot in command(cfi)Factor

Analysis

The pilot reported that as they flew the left downwind for the touch and go on runway 24, the flight instructor 'mentioned an approach which involved a short field, soft field, dead stick over a 50 foot obstacle.' The pilot reported that he attempted to land using the suggested technique. The pilot reported the flight instructor told him when to pull the power to idle and begin the glide. The pilot reported, '... I realized I was too high, so [I] made an 'S' turn to the south and then to the north, descending all the while.' At 50 feet agl the stall warning horn sounded. The pilot applied full power and lowered the nose slightly, but the airplane impacted the soft ground beside the runway in a 'pancake' fashion. The pilot reported the instructor pilot did not brief the landing technique prior to the flight, and the flight instructor did not demonstrate the maneuver in flight.

Factual narrative

On June 17, 1999, at 1440 central daylight time, a Grumman AA-5B, N4531R, was substantially damaged when it impacted the ground during a touch and go landing. The pilots were practicing a landing using the short field landing over a 50 foot obstacle technique. The 14 CFR Part 91 flight had departed Washington Municipal Airport, Washington, Iowa, en route to Iowa City Municipal Airport, Iowa City, Iowa, on a local training flight. The pilot reported the training flight was the second flight hour of the required three flight hours leading to Level VII of the Pilot Proficiency Award Program. The private pilot and instructor pilot received minor injuries. Visual meteorological conditions prevailed and no flight plan was filed.

The pilot reported they had practiced several touch and goes at the Washington Municipal Airport. He reported they returned to Iowa City Municipal Airport and completed two more touch and goes. The second approach was a "short field" landing over a 50 foot obstacle. The pilot reported that the flight instructor did not think the airplane would have cleared a 50 foot obstacle and probably would have run off the "short runway." Another touch and go was attempted.

The pilot reported that as they flew the left downwind for runway 24, the flight instructor "mentioned an approach which involved a short field, soft field, dead stick over a 50 foot obstacle." The pilot reported that he repeated the landing instructions and attempted to land using the suggested technique. The pilot reported the flight instructor told him when to pull the power to idle and begin the glide. The pilot reported that he "realized I was too high, so [I] made an "S" turn to the south and then to the north, descending all the while."

He reported that the airplane was north of runway 24 and at 50 feet agl when the stall warning horn sounded. He reported that he immediately applied full power and lowered the nose slightly. He reported the airplane impacted the soft ground beside the runway in a "pancake" fashion. Rescue personnel were required to get the pilots out of the airplane. The pilots were transported to a hospital for observation and minor injuries.

The pilot reported the instructor pilot did not brief the landing technique prior to the flight, and the flight instructor did not demonstrate the maneuver in flight.

Aircraft

Registration
N4531R
Reported as
Grumman AA-5KB
Category
Airplane
Serial number
AA5B-1163
Airframe hours
1,100
Engine
Lycoming O-360-A4K, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Instructional · Part 91
Registered owner
Dean Thornberry
Airworthiness certificate
Standard, Normal
Last inspection
Annual · October 22, 1998 · 33 hours before
Departed
IOW · Washington, IA
Destination
IOW
Airport
IOW · Iowa Municipal Airport, runway 24, 4,345 × 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
57
Certificate
Private
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
641 total · 584 as pilot in command · 27 in the last 90 days · 9 in the last 30 days · 7 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Variable at 3 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
70 °F, dew point 46 °F
Altimeter
30.00 inHg
Observed at
IOW

FAA reports on this event · 1

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