LAX98LA147

NTSB accident investigation · Schweizer SGS-1-35 · Maricopa, AZ · April 28, 1998

Accident · Serious injuriesLimited investigationFinal report
Date
April 28, 1998, 13:15 local (20:15 UTC)
Place
Maricopa, AZ
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N34187Schweizer SGS-1-35
Weather
Visual (VMC) · Day
Status
Completed · report April 19, 2001
Report
Approved by Office Director
FAA report
19980428015339A
Case key
30078

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 loss of control in flight for undetermined reasons.

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 flightTakeoff - initial climb
Aircraft control - not maintainedPilot in commandCause
In flight collision with terrain/waterManeuvering - turn to landing area (emergency)
Terrain condition - ditch

Analysis

The pilot towing the glider reported that after takeoff, the glider veered to the right. The tow plane yawed hard to the left and the towrope snapped while at an altitude of approximately 700 feet agl. Witnesses reported that as the glider pilot attempted to return to the airport to land, it impacted a ditch that ran between the two runways. Rescue workers reported that the pilot was incoherent and they suspected that he had suffered a stroke. One witness reported that the pilot had medical problems that prohibited him from flying more than 2 hours at a time. The pilot did not possess a medical certificate, nor is he required to. The pilot spent approximately 1 month in the hospital and has no memory of the accident. His wife was unable to find any aircraft or pilot logbooks. The pilot's family sold the glider and no further examination was possible.

Factual narrative

On April 28, 1998, at 1315 hours mountain standard time, a Schweizer SGS-1-35, N34187, crashed after premature release of the tow rope and impacted a ditch. The glider sustained substantial damage, and the pilot/owner, the sole occupant, suffered serious injuries. Visual meteorological conditions prevailed for the local personal flight and no flight plan was filed.

In a written statement from the pilot towing the glider, he reported that the takeoff and initial climb were normal. About 450 feet agl, the glider pilot moved out of position to the right, which caused the tow plane to yaw hard to the left. After bringing the glider back to the normal tow position, the glider veered rapidly to the right. The tow plane yawed hard to the left and the towrope snapped while at an altitude of approximately 700 feet agl. The tow pilot reported that it is their usual practice to release the towrope at 2,000 feet agl. The tow pilot then returned to the airport for landing.

According to a Federal Aviation Administration (FAA) inspector from the Scottsdale, Arizona, Flight Standards District Office, witnesses reported that during takeoff they saw the glider veer to the right and saw the tow line break. As the glider pilot attempted to return to the airport to land, it impacted a ditch that ran between the two runways. Rescue workers reported that the pilot was incoherent and they suspected that he had suffered a stroke. One witness reported that the pilot had medical problems that prohibited him from flying more than 2 hours at a time. The pilot did not possess a medical certificate. FAA Regulation Part 61.103 states that a private pilot with a glider rating has only to "certify that he has no known medical defect that makes him unable to pilot a glider or free balloon, as appropriate."

The pilot spent approximately 1 month in the hospital for various injuries inflicted from the accident. His wife reported that he has no memory of the accident. She also reported that she was unable to find any aircraft or pilot logbooks. The pilot's family sold the glider and no further examination was possible.

Aircraft

Registration
N34187
Reported as
Schweizer SGS-1-35
Category
Glider
Serial number
47
Engine
unknown
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Joseph Greenbaum
Airworthiness certificate
Standard, Normal
Airport
E68 · Maricopa, runway 7, 3,740 × 20 ft, dirt

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
74
Certificate
Private
Medical
Unknown
Seat
Center
Flight hours
1,000 total

Weather

Conditions
Visual (VMC) · Day
Wind
40° at 9 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
82 °F, dew point 34 °F
Altimeter
29.00 inHg
Observed at
CGZ, 18 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.