SEA01LA130

NTSB accident investigation · Piper PA-28-181 · Tekoa, WA · July 13, 2001

Accident · No injuriesLimited investigationFinal report
Date
July 13, 2001, 10:15 local (17:15 UTC)
Place
Tekoa, WA
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N4920FPiper PA-28-181
Weather
Visual (VMC) · Day
Status
Completed · report February 20, 2002
Report
Approved by Office Director
Parties
FAA - Spokane FSDO
FAA report
20010713020699A
Case key
52717

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 non-current pilot's failure to maintain sufficient altitude or clearance with wheat crops on short final, and the flight instructor's inadequate remedial action. Factors included wheat crops and a dirt bank on short final, the runway's lack of a visual approach slope indicator installation, and a visual illusion (wheat crop matched background color) that impaired both pilots' ability to visually detect the wheat crops.

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 objectApproach - vfr pattern - final approach
Terrain condition - cropFactor
Altitude/clearance - not maintainedCopilot/second pilotCause
Remedial action - inadequatePilot in command(cfi)Cause
Visual illusionFlightcrewFactor
Airport facilities,visual apch slope ind(vasi) - not installedFactor
In flight collision with terrain/waterApproach - vfr pattern - final approach
Terrain condition - dirt bank/rising embankmentFactor

Analysis

The non-current pilot, who was undergoing a 14 CFR 61.56 flight review with a flight instructor, was practicing a short field landing. According to airport data at the Internet site www.airnav.com, a 4-foot terrain rise is located 80 feet from the end of the runway. The pilots stated that this rise had a heavy growth of wheat about 3 to 4 feet tall at the time. The trainee pilot stated that the wheat at that time "was a solid dark green which gave no depth perception", which he stated "in essence created an invisible...wall" on short final. While on short final, the aircraft contacted the wheat, causing a rapid deceleration and loss of altitude (the flight instructor stated that once he noticed the terrain rise, he was unable to get on the controls before the aircraft contacted the wheat.) The airplane subsequently struck an approximately 2-foot-high bank along a dirt road approximately 40 feet from the end of the runway. As the aircraft crossed over this bank, all three wheels caught on the bank and sheared off. The aircraft then came down on the runway and slid down the runway for about 250 to 300 feet. According to the U.S. Government Airport/Facility Directory, the runway has a yellow centerline marking only, and the markings are very faded. The runway does not have a displaced threshold or visual approach slope indicator (VASI), and the U.S. Government Airport/Facility Directory lists obstructions for the runway as a powerline.

Factual narrative

On July 13, 2001, approximately 1015 Pacific daylight time, a Piper PA-28-181 airplane, N4920F, registered to and being flown by a private pilot who was undergoing a 14 CFR 61.56 flight review, was substantially damaged in an inflight crop strike on short final approach and subsequent inflight collision with an embankment short of runway 22 at Willard Field, Tekoa, Washington. The pilot and flight instructor were not injured in the accident. Visual meteorological conditions, with calm winds, were reported by the pilot and no flight plan was filed for the 14 CFR 91instructional flight.

The pilot undergoing the flight review reported that he was practicing a short field landing at the time. He stated that at the airport, there is a low hill on the northeast end of runway 22, which he reported is about 10 feet high and had "a heavy growth of wheat four [feet] tall" at the time of the accident. He stated that the wheat at that time "was a solid dark green which gave no depth perception", which he stated "in essence created an invisible fifteen [foot] wall." He reported that the top of the hill was approximately 100 feet from the end of the runway. The pilot reported that "On short final my wheels touched the wheat which caused a rapid deceleration and loss of altitude." The pilot stated the airplane subsequently struck a 16-inch-high bank along a dirt road approximately 30 feet from the end of the runway. He stated that "as we crossed over this bank all three wheels caught on this bank [and] sheared off." The pilot stated that the airplane flew on for another 70 feet, struck its propeller, and slid down the runway for another 300 feet. According to a copy of the pilot's logbook furnished by the pilot, his last documented flight review prior to the accident was June 15, 1996, with a total of 4.2 flight hours and three flights logged between the last flight review and the accident flight.

In a statement to an FAA inspector, the flight instructor reported that on final, "it appeared [the pilot] was aiming for the end of the runway for his landing point." He stated that on short final, he noticed that there was a rise in the terrain, but that by the time he got his hands on the controls "we were already in the grain and it was sucking us down." The instructor stated that the aircraft subsequently touched down at the edge of the grain field and then bounced across a road. The instructor stated that the aircraft's landing gear broke off when the aircraft contacted an 18-inch rise (the dirt bank) on the far side of the road. He stated that the aircraft then bounced again, came down on the runway, and slid for about 237 feet down the runway. The instructor stated that the grain was 37 inches high on top of the rise in the farmer's field.

According to the U.S. Government Airport/Facility Directory, Willard Field's single runway, 04-22, is 2,261 feet long, 25 feet wide, and asphalt-surfaced. The airport elevation is 2,513 feet above sea level. The A/FD airport remarks state that runway 04-22 has a yellow centerline marking only, and that the markings are very faded. The A/FD lists runway 22 obstructions as a powerline. According to the commercial Internet airport information site www.airnav.com, which cites the FAA as its data source, runway 22 has a 2-foot-high county road 40 feet from the end of the runway, and a 4-foot-high dirt bank 80 feet from the threshold. The runway is not equipped with any type of visual glide path indicator such as a visual approach slope indicator (VASI) system, and the runway 22 threshold is not displaced.

Aircraft

Registration
N4920F
Reported as
Piper PA-28-181
Category
Airplane
Serial number
28-7790073
Airframe hours
3,453
Engine
Lycoming O-360-A4M, 180 hp, reciprocating
Damage
Substantial damage
Flight
Instructional · Part 91
Airworthiness certificate
Standard, Normal; Standard, Utility
Last inspection
Annual · July 14, 2000 · 0 hours before
Departed
Unknown
Destination
73S · Tekoa, WA
Airport
73S · Willard Field, runway 22, 2,261 × 25 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 · 2

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
74
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Valid Medical--w/ waivers/lim
Last flight review
June 15, 1996
Seat
Left
Flight hours
653 total
Role
Flight instructor
Age
48
Injuries
None
Certificates
Flight instructor, Airline transport
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Unknown, Unknown
Seat
Right
Flight hours
12,500 total · 30 in this make and model · 120 in the last 90 days

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
73 °F

FAA reports on this event · 1

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