SEA98LA173

NTSB accident investigation · Koskella Long EZ · Cascade, ID · September 2, 1998

Accident · No injuriesLimited investigationFinal report
Date
September 2, 1998, 08:10 local (14:10 UTC)
Place
Cascade, ID
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N5159PKoskella Long EZ
Weather
Visual (VMC) · Day
Status
Completed · report January 11, 2000
Report
Approved by Office Director
FAA report
19980902022219A
Case key
43900

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 failure to maintain airspeed on final approach. Factors include inadequate remedial action and erroneous airspeed indications.

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.

UndershootApproach - vfr pattern - final approach
Flight/nav instruments,airspeed indicator - false indicationFactor
Airspeed - not maintainedPilot in commandCause
Remedial action - inadequatePilot in commandFactor
Gear collapsedLanding - roll

Analysis

The pilot, a Navy test pilot with approximately 1500 hours total flight time in the Long EZ, reported that on short final the aircraft began to settle rapidly and touched down hard approximately 250 feet short of the threshold. He indicated that there was no mechanical malfunction with the aircraft's power plant or systems. However, in his written report, he stated that on short final he 'scanned the instrument panel and noticed the airspeed read 100 mph. (This is way too high to stop a Long EZ on a 4000' runway.) Aircraft attitude seemed normal, approach was at appropriate altitude/lineup, so I reduced power and deployed the speed brake. In my aircraft, the speed brake blows closed at 95 mph from aerodynamic forces-it stayed out. As I mentally started processing the fact that the speed brake did not blow back, I sensed an increase in the rate of descent. I retracted the speed brake, added full power, and eased the nose up-touching down 250' short of the runway.' The pilot also reported that he believed the 'airspeed indicator stuck at 100 mph during final approach.' He stated that 'I'm not sure this could have reasonably been foreseen or prevented; higher approach speed would have prevented the settle that developed on short final, but I would have had to instantly recognize the airspeed indicator error. By the time I recognized an excess rate of descent and initiated a wave-off, it was too late to avoid touching down.'

Factual narrative

On September 2, 1998, approximately 0810 mountain daylight time, a Long EZ, N5159P, built and being flown by a commercial pilot, incurred substantial damage when the aircraft touched down short of runway 30 at the Cascade airport, Cascade, Idaho. Federal Aviation Administration personnel, who were initially notified by the airport, reported that wing spar damage was incurred, and that all three landing gear had collapsed. The pilot and his passenger were uninjured. Visual meteorological conditions prevailed, and no flight plan had been filed. The flight, which was personal in nature, was to have been operated under 14CFR91 and originated from Cascade approximately 0740 on the morning of the accident. Winds at McCall, Idaho, located 24 nautical miles north, were reported as calm at 0750.

The pilot, a Navy test pilot with approximately 1500 hours total flight time in the Long EZ, reported that on short final the aircraft began to settle rapidly and touched down hard approximately 250 feet short of the threshold. He indicated that there was no mechanical malfunction with the aircraft's power plant or systems. However, in his written report, he stated that on short final he "scanned the instrument panel and noticed the airspeed read 100 mph. (This is way too high to stop a Long EZ on a 4000' runway.) Aircraft attitude seemed normal, approach was at appropriate altitude/lineup, so I reduced power and deployed the speed brake. In my aircraft, the speed brake blows closed at 95 mph from aerodynamic forces - it stayed out. As I mentally started processing the fact that the speed brake did not blow back, I sensed an increase in the rate of descent. I retracted the speed brake, added full power, and eased the nose up - touching down 250' short of the runway." The pilot went on to add that the cause of the accident was "slow/failure to recognize and respond to airspeed reading high at critical point in landing."

The pilot also reported that he believed the "airspeed indicator stuck at 100 mph during final approach." He stated that "I'm not sure this could have reasonably been foreseen or prevented; higher approach speed would have prevented the settle that developed on short final, but I would have had to instantly recognize the airspeed indicator error. By the time I recognized an excess rate of descent and initiated a wave-off, it was too late to avoid touching down."

Aircraft

Registration
N5159P
Reported as
Koskella Long EZ
Category
Airplane, amateur-built
Airframe hours
1,450
Engine
Lycoming O-235-C2C, 108 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Koskella, Kenneth, R.
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Annual · June 10, 1998 · 50 hours before
Departed
U70
Airport
U70 · Cascade, runway 30, 4,300 × 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
51
Certificates
Military, Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 3, Valid Medical--no waivers/lim.
Seat
Front
Flight hours
5,500 total · 1,450 in this make and model · 5,300 as pilot in command · 40 in the last 90 days · 20 in the last 30 days · 5 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
43 °F, dew point 37 °F
Altimeter
30.00 inHg
Observed at
MYL

FAA reports on this event · 1

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