- Date
- December 19, 2015, 14:00 local (21:00 UTC)
- Place
- Portales, NM
- Injuries
- 2 uninjured
- Damage
- Substantial damage
- Phase of flight
- Landing
- Aircraft
- N97411Stinson 108
- Defining event
- Landing-aborted after touchdown: Loss of control on ground
- Weather
- Visual (VMC) · Day
- Status
- Completed · report April 5, 2016
- Report
- Approved by Office Director
- NTSB office
- General Aviation Accidents
- Parties
- Lubbock FSDO (FAA)
- FAA report
- 20151219022179A
- Case key
- 92503
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
The pilot receiving instruction's improper brake application during the flight instructor's aborted landing, which resulted in a loss of directional control and a runway excursion. Contributing to the accident was the flight instructor's decision to perform flight training in an airplane without dual-equipped wheel brakes.
Findings · 4
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.
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 flight instructor, seated in the right seat, was providing tail-wheel flight instruction in an airplane equipped with wheel brakes only accessible to the pilot in the left seat. The flight instructor reported that he demonstrated the first landing to the pilot receiving instruction in the left seat. During the landing roll, he reported that he began to lose rudder effectiveness and the airplane started to veer to the right, so he applied full power to abort the landing. The flight instructor further reported that during the aborted landing, the pilot receiving instruction applied both toe brakes at the moment full power was applied. The flight instructor attempted to maintain directional control, but the left wing impacted the runway and the airplane veered off the runway to the left. The flight instructor reduced the power to idle and the airplane stopped in the terrain adjacent to the runway. The left wing and left aileron were substantially damaged. The pilot receiving instruction reported that he remained clear of the flight controls and brakes during the landing roll. He reported that he applied brakes only after the runway excursion to the left, after the flight instructor had reduced power to idle during the aborted landing. The flight instructor and pilot receiving instruction reported there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation. Postaccident photos revealed deceleration skid marks leading off the runway first to the right, and additional deceleration skid marks about 550 feet further down the runway leading off to the left into the grass. The flight instructor reported the automated weather observing system about the time of the accident reported wind from 220 degrees true at 10 knots, which resulted in a 5 knot crosswind.
Factual narrative
The flight instructor, seated in the right seat, was providing tail-wheel flight instruction in an airplane equipped with wheel brakes only accessible to the pilot in the left seat. The flight instructor reported that he demonstrated the first landing to the pilot receiving instruction in the left seat. During the landing roll, he reported that he began to lose rudder effectiveness and the airplane started to veer to the right, so he applied full power to abort the landing. The flight instructor further reported that during the aborted landing, the pilot receiving instruction applied both toe brakes at the moment full power was applied. The flight instructor attempted to maintain directional control, but the left wing impacted the runway and the airplane veered off the runway to the left. The flight instructor reduced the power to idle and the airplane stopped in the terrain adjacent to the runway. The left wing and left aileron were substantially damaged. The pilot receiving instruction reported that he remained clear of the flight controls and brakes during the landing roll. He reported that he applied brakes only after the runway excursion to the left, after the flight instructor had reduced power to idle during the aborted landing. The flight instructor and pilot receiving instruction reported there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation. Postaccident photos revealed deceleration skid marks leading off the runway first to the right, and additional deceleration skid marks about 550 feet further down the runway leading off to the left into the grass. The flight instructor reported the automated weather observing system about the time of the accident reported wind from 220 degrees true at 10 knots, which resulted in a 5 knot crosswind.
Aircraft
- Registration
- N97411
- Reported as
- Stinson 108 (1)
- Category
- Airplane
- Serial number
- 108-411
- Built
- 1946
- Airframe hours
- 1,868.3
- Engine
- Franklin 6A4-150-B3, 150 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Instructional · Part 91
- Airworthiness certificate
- Standard, Normal
- Last inspection
- Annual · March 8, 2015
- Departed
- PRZ · Portales, NM
- Destination
- PRZ · Portales, NM
- Airport
- PRZ · Portales Muni, runway 19, 5,700 × 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 · 2
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 72
- Injuries
- None
- Certificate
- Private
- Airplane ratings
- Single-engine land
- Medical
- Class 3, Without waivers/limitations
- Seat
- Left
- Restraint
- Lap only
- Flight hours
- 80 total · 15 in this make and model
- Role
- Flight instructor
- Age
- 22
- Injuries
- None
- Certificates
- Flight instructor, Commercial
- Airplane ratings
- Single-engine land
- Instrument ratings
- Airplane
- Medical
- Class 1, Without waivers/limitations
- Last flight review
- May 18, 2015
- Seat
- Right
- Restraint
- Lap only
- Flight hours
- 350 total · 3 in this make and model · 310 as pilot in command · 35 in the last 90 days · 5 in the last 30 days
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 240° at 18 knots
- Visibility
- 10 statute miles
- Lowest ceiling
- None
- Temperature
- 63 °F, dew point 16 °F
- Altimeter
- 30.11 inHg
- Observed at
- KCVS, 14 nm away
Docket · 3
The files NTSB released with the investigation on March 10, 2016, on NTSB’s docket system: statements, records, photos and specialists’ reports. 4.3 MB in all.
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.