LAX02LA254

NTSB accident investigation · Waco YPF-7 · Dewey, AZ · August 17, 2002

Accident · Minor injuriesLimited investigationFinal report
Date
August 17, 2002, 14:55 local (21:55 UTC)
Place
Dewey, AZ
Injuries
2 minor
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N29904Waco YPF-7
Weather
Visual (VMC) · Day
Status
Completed · report September 30, 2003
Report
Approved by Office Director
Parties
FAA FSDO
FAA report
20020817019929A
Case key
55505

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 loss of engine power due to a flooded carburetor. A contributing factor was the lack of suitable terrain for the forced landing.

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 engine powerCruise
Fuel system,carburetor float - crackedCause
Forced landingEmergency descent/landing
On ground/water collision with objectEmergency landing
Object - fence
Terrain condition - none suitableFactor

Analysis

The vintage biplane was in cruise flight at 9,500 feet msl, when the engine lost power. The pilot initiated a forced landing to a narrow dirt road and attempted to reestablish engine power to no avail. The airplane touched down at an airspeed just below 70 mph, and started to decelerate. The lower left wingtip struck a barbed wire fence. The airplane veered to the right, impacted a fence, and nosed over coming to rest inverted. Examination of the engine, under supervision of an FAA inspector, revealed that the carburetor float was cracked, which "resulted in a flooded carburetor". The aircraft maintenance records indicated the carburetor was overhauled 3 months prior to the accident.

Factual narrative

On August 17, 2002, at 1455 mountain standard time, a Waco YPF-7 vintage biplane, N29904, was substantially damaged during a forced landing following a loss of engine power while in cruise flight near Dewey, Arizona. The airline transport pilot and his passenger sustained minor injuries. The airplane was owned by STI Enterprises, Inc., of Wilmington, Delaware, and was being operated by the pilot. Visual meteorological conditions prevailed for the 14 Code of Federal Regulations Part 91 personal flight for which a flight plan was not filed. The cross-country flight originated from the H.A. Clark Memorial Field Airport (P32), near Williams, Arizona, at 1428. The flight's destination was the Phoenix Deer Valley Airport (DVT), near Phoenix, Arizona.

The 20,457-hour pilot reported in the Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1/2) that while in cruise flight at 9,500 feet msl, the engine started to lose power without warning. During the emergency descent, the pilot attempted to restart the engine while looking for a place to land. The pilot located a narrow dirt road and maneuvered the airplane for landing.

The airplane touched down on the road at an airspeed just below 70 mph, and the airplane began to decelerate. During the landing roll, the lower right wing tip struck a barbed-wire fence. Subsequently, the airplane veered to the right crossing a ditch, impacting a barbed wire fence where it nosed over and came to rest inverted in a pasture adjacent to the road.

The pilot stated that both the upper and lower right wings were destroyed, and the vertical fin and rudder were damaged. The pilot further reported that he topped-off the airplane's fuel tanks prior to departure from P32. The recovery crew drained 30 gallons of fuel from the fuel system prior to the recovery of the airplane.

Examination of the engine, under supervision of an FAA inspector revealed that the carburetor float was cracked, which "resulted in a flooded carburetor". The aircraft maintenance records indicated the carburetor was overhauled 3 months prior to the accident.

Aircraft

Registration
N29904
Reported as
Waco YPF-7
Category
Airplane
Serial number
5401
Airframe hours
3,517.6
Engine
Jacobs R755-7, 245 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Arvin C. Schultz
Registered owner
STI Enterprises Inc.
Airworthiness certificate
Standard, Normal
Last inspection
Annual · February 2, 2002 · 31.6 hours before
Departed
P32 · Williams, AZ
Destination
DVT · Phoenix, AZ

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
67
Injuries
Minor
Certificate
Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Last flight review
January 26, 2002
Seat
Rear
Flight hours
20,457 total · 201 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
260° at 12 knots, gusting 18
Visibility
10 statute miles
Lowest ceiling
None
Temperature
93 °F, dew point 48 °F
Altimeter
30.10 inHg
Observed at
PRC, 10 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.