GAA16CA286

NTSB accident investigation · Cessna 172 · Arlington, WA · June 6, 2016

Accident · No injuriesData collectionFinal report
Date
June 6, 2016, 12:00 local (19:00 UTC)
Place
Arlington, WA
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N539MTCessna 172
Defining event
Landing-landing roll: Landing gear collapse
Weather
Visual (VMC) · Day
Status
Completed · report May 15, 2017
Report
Approved by Office Director
NTSB office
General Aviation Accidents
Parties
FAA
Case key
93333

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 failure of the airplane’s right steering rod end, which resulted in the pilot’s inability to maintain directional control.

Findings · 3

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Attain/maintain not possibleCessna 172D: 2 casesAll aircraft: 3,958 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

According to the pilot of the tricycle landing gear-equipped airplane, he made a normal landing, but the airplane began to veer left of the centerline during the landing roll. He corrected with right rudder and heard a "thump" as if something affixed to the airplane was being dragged, and the rudder steering became ineffective. He recalled that, with constant hard right rudder input, coupled with dynamic braking, he turned the airplane to the right, the nose landing gear collapsed, and the airplane skidded to a stop. The airplane sustained substantial damage to the firewall. Photographs provided by the Federal Aviation Administration inspector revealed that the right steering rod end had failed and that the bolts of the nose gear firewall mount were pulled from the firewall. The nose gear assembly had rotated more than 90° to the left and was found underneath the fuselage. The NTSB investigator-in-charge asked that the two additional airplanes in the operator's inventory be inspected. The operator found that the steering rod ends of the inspected airplanes were bent and showed signs of cracking between the threads. The steering bungees were visually inspected; however, they could not be thoroughly inspected without damaging the component.

Factual narrative

According to the pilot of the tri-cycle landing gear-equipped airplane, he made a normal landing, but the airplane began to veer left of the centerline during the landing roll. He corrected with right rudder and heard a "thump" as if something affixed to the airplane was being dragged and the rudder steering became ineffective. He recalled that with constant hard right rudder input, coupled with dynamic braking, he turned the airplane to the right, the nose landing gear collapsed, and the airplane skidded to a stop. The airplane sustained substantial damage to the firewall. The photographs provided by the Federal Aviation Administration (FAA) Inspector revealed that the right steering rod end had failed. Photographs also revealed that the bolts of the nose gear firewall mount were pulled from the firewall. The nose gear assembly had rotated more than 90° to the left and was found underneath the fuselage. The NTSB Investigator-in-charge asked that the two additional airplanes in the operator's inventory be inspected. The operator found that the steering rod ends of the inspected airplanes, were bent and showed signs of cracking between the threads. The steering bungees were visually inspected; however, they could not be thoroughly inspected without damaging the component.

Aircraft

Registration
N539MT
Reported as
Cessna 172 (D)
Category
Airplane
Serial number
17249604
Built
1962
Airframe hours
4,741.4
Engine
Lycoming O-360-A4M, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Mission Aviation Training Academy
Registered owner
Mission Aviation Training Academy
Airworthiness certificate
Standard, Normal
Last inspection
Annual · June 10, 2015
Departed
W33 · Friday Harbor, WA
Destination
AWO · Arlington, WA
Airport
AWO · Arlington Muni, runway 34, 5,332 × 100 ft, asphalt
Equipment
Electronic flight bag or handheld device, Stall warning system

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
54
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Last flight review
June 24, 2015
Seat
Left
Restraint
3-point
Flight hours
283 total · 175 in this make and model · 214 as pilot in command · 17 in the last 90 days · 6 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
330° at 10 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
75 °F, dew point 54 °F
Altimeter
29.94 inHg
Observed at
KAWO

Docket · 3

The files NTSB released with the investigation on April 11, 2017, on NTSB’s docket system: statements, records, photos and specialists’ reports. 3.0 MB in all.