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November 15, 2014 · Cessna U206G G · N9420R

La Verne, CA

Overview

Report Status
Final with probable cause
Event Type
Accident
Date
November 15, 2014
Injury Outcomes
No injuries (3 uninjured)
Location
La Verne, CA
Aircraft
Cessna U206G G (1987)
Tail Number
N9420R
Operator
Civil Air Patrol
Injuries
None
Aircraft Damage
Substantial
NTSB Number
WPR15LA042

The private pilot reported that, during landing, he had difficulty controlling the airplane after the nosewheel settled onto the runway. The pilot stated that the airplane initially veered to the left; however, he was able to correct its track. The airplane then veered left a second time, he was unable to regain control, and the airplane subsequently exited the runway surface. During the accident sequence, the right wing struck the ground. Postaccident examination of the airplane revealed a deflated nosewheel oleo strut; however, the investigation was unable to determine whether the strut became deflated before or during the accident sequence. The airplane displayed proper nosewheel steering when weight was applied on the nosewheel strut. No further anomalies were noted with the airplane's nosewheel steering, nosewheel assembly, braking system, or tires; thus, the reason for the loss of control could not be determined.

NTSB Probable Cause

The pilot's loss of directional control during the landing roll for reasons that could not be determined, because postaccident examination of the nosewheel assembly revealed no anomalies that would have precluded normal operation.

Full Narrative

On November 15, 2014, about 1420 Pacific standard time, a Cessna U206G, N9420R, veered off the runway during landing at Brackett Field Airport (POC), La Verne, California. The airplane was registered to and operated by the Civil Air Patrol under the provisions of Title 14 Code of Federal Regulations Part 91. The private pilot and two passengers were not injured. The airplane sustained substantial damage to the right wing during the accident sequence. Visual meteorological conditions prevailed and no flight plan had been filed. The instructional flight departed from San Gabriel Valley Airport, El Monte, California, about 1350. During a telephone interview with the National Transportation Safety Board (NTSB) investigator-in- charge (IIC), the pilot stated that he had difficulties controlling the airplane after the nose wheel settled onto the runway, during the landing roll. The pilot further stated that the airplane initially veered to the left; however, he was able to initially counteract the deviation and the airplane was then positioned near the right side of the runway. Subsequently, the airplane veered left a second time, and he was unable to prevent it from exiting the runway surface, where the right wing struck the ground. The two passengers onboard the airplane stated that the landing was normal and shortly thereafter the pilot lost directional control of the airplane. Postaccident examination of the airplane with a certified airframe and powerplant mechanic under the supervision of the NTSB IIC, revealed that the right wing was bent upwards about 3 feet from the wing tip. The airplane's braking continuity from the rudder pedals to the brakes was established with no anomalies. Examination of the nose tire, main tires, and braking assemblies revealed no anomalies. The nose gear assembly was examined and the nose oleo strut was observed to be deflated. However, with weight on the nose wheel, provided by lifting up on the airplane's tail, the nose wheel responded appropriately to pedal steering. The investigation was unable to determine if the deflated strut was due to impact damage or a malfunction. No additional mechanical malfunctions or failures were found that would have precluded normal operation. The airplane's nose wheel steering system links the rudder pedals to the nose wheel. According to the airplane's Pilot's Operating Manual, "when a rudder pedal is depressed a spring-loaded bungee will turn the nose wheel ... approximately 15 degrees each side of center." By applying either left or right brake, the degree of turn can be increased up to 35 degrees each side of center. According to the aircraft manufacturer representative, "a steerable nose wheel, mounted in a fork, attached to an air/oil (oleo) shock strut, makes up the nose gear. Nose wheel steering is accomplished through the use of the rudder pedals. A hydraulic fluid-filled shimmy dampener is provided to minimize nose wheel shimmy. The nose wheel steering system links the rudder pedals to the nose wheel steering arm, affording steering control through the use of the rudder pedals and brakes. Torque links keep the lower strut aligned with the nose gear steering system, but permit shock strut action. A properly serviced nose gear oleo will fully extend, when the nose wheel is lifted off the ground. A centering stop log is located on the upper torque link. When the nose gear oleo fully extends, the centering stop lug interfaces with a cutout near the top of the oleo to prevent the nose gear from moving when the rudder pedals are actuated. When the nose gear oleo is compressed the centering stop lug is removed from the cutout allowing the nose tire to move in response to rudder pedal input."

Flight

Event TypeAccident
Event Time14:20 PST
Nearest AirportBrackett Field (0nm E)
Runway26L
Runway Length4840 ft
Runway Width75 ft
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftCessna U206G G
Tail NumberN9420R
Aircraft CategoryAir
DamageSubstantial
OperatorCivil Air Patrol
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · IO520F · Reciprocating · 300
Seats4

People & Injuries

Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 57 · Third Class · None

Conditions

ConditionsVMC
LightDaylight
Wind250° @ 7 kt
Visibility10 sm
CeilingBroken clouds 7000 ft
Temperature / Dew Point68 F / 50
Altimeter30.03 inHg
Observation Time22:21
Weather SourceWFAC

Appendix: Source Data