WPR22LA003

NTSB accident investigation · Interstate S-1A · Independence, OR · October 2, 2021

Accident · No injuriesClass 4 · LimitedFinal report
Date
October 2, 2021, 08:10 local (15:10 UTC)
Place
Independence, OR · On the airport
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N37317Interstate S-1A
Defining event
Takeoff: Sys/Comp malf/fail (non-power)
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 4 - Basic report with no Prelim publish
NTSB office
Western Pacific Region
Parties
Federal Aviation Administration
Case key
104051

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 separation of the left rudder pedal interconnect cable during takeoff, which resulted in the student pilot’s inability to maintain directional control.

Findings · 2

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 possibleInterstate S-1A: 1 caseAll 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

The solo student pilot reported that, he was unable to maintain directional control of the tailwheel equipped airplane during the takeoff roll when he depressed the left rudder pedal. He aborted the takeoff and the airplane veered to the right, exited the right side of the runway, and impacted multiple airport signs, substantially damaging the right wing. Postaccident examination of the airplane by the owner revealed that, the control cable that interconnects the forward and aft seat left rudder pedals had failed. The owner further stated that it appeared the control cable had pulled through the nicopress swage and that the crimp marks were still visible on the swage. A review of the airplane maintenance records revealed that, the airplane amassed about 1,483.4 hours since the control cables were replaced about 21 years before the accident.

Aircraft

Registration
N37317
Reported as
Interstate S-1A
Category
Airplane
Serial number
160
Built
1941
Airframe hours
5,770.7
Engine
Continental Motors A65, 65 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Jeannes Flying Service LLC
Registered owner
Jeannes Flying Service LLC
Airworthiness certificate
Standard, Normal
Last inspection
Annual · September 9, 2021
Destination
Malino, OR
Airport
7S5 · Independence State, runway 34, 3,002 × 60 ft, asphalt
Equipment
None

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
57
Injuries
None
Certificate
Student
Medical
Sport pilot
Seat
Front
Restraint
Lap only
Flight hours
83.5 total · 42.6 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
6 statute miles
Temperature
43 °F, dew point 41 °F
Altimeter
30.22 inHg
Observed at
KSLE, 9 nm away
METAR
KSLE 021456Z 00000KT 6SM R31/1600VP6000FT BR FEW002 06/05 A3022 RMK AO2 SLP234 T00610050 51004

Docket · 6

The files NTSB released with the investigation on February 10, 2022, on NTSB’s docket system: statements, records, photos and specialists’ reports. 10.9 MB in all.