SEA06CA149

NTSB accident investigation · Maule M-7-235C · Auburn, WA · July 26, 2006

Accident · No injuriesData collectionFinal report
Date
July 25, 2006, 17:28 local (Jul 26, 2006, 00:28 UTC)
Place
Auburn, WA
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N15SNMaule M-7-235C
Weather
Visual (VMC) · Day
Status
Completed · report November 29, 2006
Report
Approved by Office Director
Parties
FAA FSDO
FAA report
20060725021789A
Case key
64445

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 directional control [not possible] during landing roll as a result of the disconnected tail wheel steering assembly [for undetermined reasons], which led to an inadvertent ground loop during the landing roll.

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.

Airframe/component/system failure/malfunctionLanding - roll
Landing gear,steering system - disconnectedCause
Loss of control - on ground/waterLanding - roll
Directional control - not possiblePilot in commandCause
Ground loop/swerve - inadvertentPilot in commandCause

Analysis

The pilot said that he noticed that the right clevis of the right tail wheel spring to the wheel's steering arm was starting to open several hours before a 10 hour maintenance inspection. The mechanic crimped the clevis during this inspection. After the inspection was completed, the pilot returned to his home airport and landed on runway 16 with a direct right crosswind of 5-10 knots. The pilot said that his landing was a normal right crosswind landing and the airplane rolled out normally for 200-300 yards. He said that the airplane started to turn right, and he applied full left rudder with no effect [a photograph of the accident scene showed a serpentine black skip mark approximately 20 feet to the left of the 75 foot wide runway center line]. The pilot said that the nose of the aircraft had started to swing sharply to the right before he could "think" of using differential braking. The airplane exited the right side of the runway and came to rest on its left wing tip, left main landing gear, and engine. The left wing and aileron were bent and wrinkled. Postaccident examination of the tail wheel assembly revealed that the clevis which connected the right tail wheel spring to the wheel's steering arm was disconnected. It was not determined why the tail wheel shimmied during the landing roll. At the time of the accident, the pilot had approximately 99 hours of flight experience, with 23 hours in make and model.

Factual narrative

On July 25, 2006, at 1728 Pacific daylight time, a Maule M-7-235C, N15SN, was substantially damaged when it ground looped during a landing roll at Auburn Municipal Airport, Auburn, Washington. The private pilot, the sole occupant on board, was not injured. The pilot/owner was operating the airplane under Title 14 CFR Part 91. Visual meteorological conditions prevailed for the personal cross-country flight which had originated from Vaughan Ranch Airfield, Port Orchard, Washington, approximately 30 minutes before the accident. The pilot had not filed a flight plan.

The pilot said that he noticed that the right clevis of the right tail wheel spring to the wheel's steering arm was starting to open several hours before a 10 hour maintenance inspection. The mechanic crimped the clevis during this inspection. After the inspection was completed, the pilot returned to his home airport and landed on runway 16 with a direct right crosswind of 5-10 knots. The pilot said that his landing was a normal right cross-wind landing and the airplane rolled out normally for 200-300 yards. He said that the airplane started to turn right, and he applied full left rudder with no effect [a photograph of the accident scene showed a serpentine black skip mark approximately 20 feet to the left of the 75 foot wide runway center line]. The pilot said that the nose of the aircraft had started to swing sharply to the right before he could "think" of using differential braking. The airplane exited the right side of the runway and came to rest on its left wing tip, left main landing gear, and engine. The left wing and aileron were bent and wrinkled.

Postaccident examination of the tail wheel assembly revealed that the clevis which connected the right tail wheel spring to the wheel's steering arm was disconnected. It was not determined why the tail wheel shimmied during the landing roll. At the time of the accident, the pilot had approximately 99 hours of flight experience, with 23 hours in make and model.

Aircraft

Registration
N15SN
Reported as
Maule M-7-235C
Category
Airplane
Serial number
25074C
Airframe hours
805
Engine
Lycoming IO-540-W1A5, 235 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Sameer A. Nene
Airworthiness certificate
Standard, Normal
Last inspection
Annual · June 1, 2006
Departed
WN13 · Port Orchard, WA
Destination
S50 · Auburn, WA
Airport
S50 · Auburn Municipal Airport, runway 16, 3,400 × 75 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
35
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Seat
Left
Flight hours
99 total · 23 in this make and model · 55 as pilot in command · 17 in the last 90 days · 14 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
290° at 5 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
75 °F, dew point 57 °F
Altimeter
29.95 inHg
Observed at
SEA, 8 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.