WPR18LA267

NTSB accident investigation · Aero Vodochody L39 · Reno, NV · September 14, 2018

Accident · No injuriesLimited investigationFinal report
Date
September 14, 2018, 10:04 local (17:04 UTC)
Place
Reno, NV
Injuries
2 uninjured
Phase of flight
Maneuvering
Aircraft
N139UKAero Vodochody L39N139PJAero Vodochody L 39
Defining events
Maneuvering-low-alt flying: Midair collisionManeuvering-low-alt flying: Midair collision
Weather
Visual (VMC) · Day
Status
Completed · report June 8, 2020
Report
Approved by Office Director
NTSB office
Western Pacific Region
Parties
Federal Aviation Administration
Case key
98316

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 of the race 13 airplane's failure to maintain clearance from the race 37 airplane during the closed course air race.

The pilot of the race 13 airplane's failure to maintain clearance from the race 37 airplane during the closed course air race.

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.

N139UK · Aero Vodochody L39

N139PJ · Aero Vodochody L 39

Attention/monitoring: monitoring other aircraftPersonnel issues › Psychological · Pilot of other aircraftAero Vodochody L-39: 1 caseAll aircraft: 231 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.

N139UK · Aero Vodochody L39

N139PJ · Aero Vodochody L 39

Analysis

During the closed course air race, the pilot of the race 13 airplane announced that he was passing the race 37 airplane on his right. A video recording of the midair collision showed that, as the two airplanes approached one of the racecourse pylons, race 13 was in a slight left bank behind race 37, which was in a level attitude. Shortly after, race 37 initiated a left bank, while race 13 was rapidly approaching race 37 from behind. Just before the collision, race 13 rolled out of the turn to an almost level attitude. The two airplanes then collided, which resulted in damage to the right wing and aileron of race 37 and damage to two inspection panels and fairings on the forward left side of the fuselage of race 13. Both airplanes landed uneventfully after the collision. The pilot of race 13 failed to maintain adequate separation from race 37 while overtaking the other airplane.

During the closed course air race, the pilot of the race 13 airplane announced that he was passing the race 37 airplane on his right. A video recording of the midair collision showed that, as the two airplanes approached one of the racecourse pylons, race 13 was in a slight left bank behind race 37, which was in a level attitude. Shortly after, race 37 initiated a left bank, while race 13 was rapidly approaching race 37 from behind. Just before the collision, race 13 rolled out of the turn to an almost level attitude. The two airplanes then collided, which resulted in damage to the right wing and aileron of race 37 and damage to two inspection panels and fairings on the forward left side of the fuselage of race 13. Both airplanes landed uneventfully after the collision. The pilot of race 13 failed to maintain adequate separation from race 37 while overtaking the other airplane.

Factual narrative

On September 14, 2018, about 1004 Pacific daylight time, a Aero Vodochody L39C, N139UK, operating as Race 13, and an Aero Vodochody L39, N139PJ, operating as Race 37 collided in midair about 3 miles north of the Reno Stead Airport (RTS), Reno, Nevada. The airline transport pilot of Race 13 and the airline transport pilot of Race 37 were not injured. Race 13 sustained minor damage to the left side of the fuselage and bottom of the left wing; race 37 sustained substantial damage to the right wing and empennage. Race 13 was registered to Black Rock Aero LLC and race 37 was registered to MPE Enterprises Corporation. Both airplanes were operated by the pilots as a Title 14 Code of Federal Regulations Part 91 air race flights. Visual meteorological conditions prevailed, and no flight plan was filed for either airplane, which originated from RTS at 0950. During an in person interview, the pilot of race 13 reported that he was observing the pilot of race 37 flying a tight line on the course and he was observing his line throughout the race, and announced on the race frequency that he was passing race 37 on the right. The pilot said that he had sight of race 37 at all times and that during the 5th lap, in an area of pylon 4, he thought the pilot of race 37 may have rolled right prior to the collision. Following the collision, the pilot of race 13 declared an emergency and landed uneventfully. During an in person interview, the pilot of race 37 reported that during the 4th lap, while passing pylon 7, he recalled hearing the pilot of race 13 state that he was on his right. The pilot said that during the 5th lap, as he was passing pylon 4, it felt like a car crash and that he never saw race 13. Shortly after, he heard the pilot of race 13 declare a mayday and he decided to declare mayday as well, while noting sluggish control responsiveness. The pilot of race 37 was able to land uneventfully. Review of video that was captured by a witness revealed that race 37 appeared to be in a level attitude while nearing pylon 4, and race 13 appeared to be in a slight left bank, behind race 37. Shortly after, race 37 was observed initiating a left bank, while race 13 was rapidly approaching race 37 from behind. Just prior to the collision, race 13 was observed rolling out of the turn to an almost level attitude. Examination of Race 37 revealed that the outboard 24 inches of the right wing and right aileron were separated from the airplane. Additional damage to the bottom portion of the vertical stabilizer and the leading edge of the left horizontal stabilizer was observed. Examination of Race 13 revealed damage to two inspection panels and fairings on the forward left side of the fuselage.

On September 14, 2018, about 1004 Pacific daylight time, a Aero Vodochody L39C, N139UK, operating as Race 13, and an Aero Vodochody L39, N139PJ, operating as Race 37 collided in midair about 3 miles north of the Reno Stead Airport (RTS), Reno, Nevada. The airline transport pilot of Race 13 and the airline transport pilot of Race 37 were not injured. Race 13 sustained minor damage to the left side of the fuselage and bottom of the left wing; race 37 sustained substantial damage to the right wing and empennage. Race 13 was registered to Black Rock Aero LLC and race 37 was registered to MPE Enterprises Corporation. Both airplanes were operated by the pilots as a Title 14 Code of Federal Regulations Part 91 air race flights. Visual meteorological conditions prevailed, and no flight plan was filed for either airplane, which originated from RTS at 0950.During an in person interview, the pilot of race 13 reported that he was observing the pilot of race 37 flying a tight line on the course and he was observing his line throughout the race, and announced on the race frequency that he was passing race 37 on the right. The pilot said that he had sight of race 37 at all times and that during the 5th lap, in an area of pylon 4, he thought the pilot of race 37 may have rolled right prior to the collision. Following the collision, the pilot of race 13 declared an emergency and landed uneventfully. During an in person interview, the pilot of race 37 reported that during the 4th lap, while passing pylon 7, he recalled hearing the pilot of race 13 state that he was on his right. The pilot said that during the 5th lap, as he was passing pylon 4, it felt like a car crash and that he never saw race 13. Shortly after, he heard the pilot of race 13 declare a mayday and he decided to declare mayday as well, while noting sluggish control responsiveness. The pilot of race 37 was able to land uneventfully. Review of video that was captured by a witness revealed that race 37 appeared to be in a level attitude while nearing pylon 4, and race 13 appeared to be in a slight left bank, behind race 37. Shortly after, race 37 was observed initiating a left bank, while race 13 was rapidly approaching race 37 from behind. Just prior to the collision, race 13 was observed rolling out of the turn to an almost level attitude. Examination of Race 37 revealed that the outboard 24 inches of the right wing and right aileron were separated from the airplane. Additional damage to the bottom portion of the vertical stabilizer and the leading edge of the left horizontal stabilizer was observed. Examination of Race 13 revealed damage to two inspection panels and fairings on the forward left side of the fuselage.

Aircraft · 2

Registration
N139UK
Reported as
Aero Vodochody L39 (C)
Category
Airplane
Serial number
031822
Built
1982
Engine
Ivencheko AI-25-TL, 3,792 lbs thrust, turbo fan
Damage
Minor damage
Flight
Air race/show · Part 91
Airworthiness certificate
Special, Experimental (Special)
Departed
RTS · Reno, NV
Destination
RTS · Reno, NV
Airport
RTS · Reno/Stead

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.

Registration
N139PJ
Reported as
Aero Vodochody L 39
Category
Airplane
Serial number
232226
Built
1982
Airframe hours
2,296.3
Engine
Ivchenko AL25TL, 3,800 lbs thrust, turbo fan
Damage
Substantial damage
Flight
Air race/show · Part 91
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Annual · May 2, 2018
Departed
RTS · Reno, NV
Destination
RTS · Reno, NV
Airport
RTS · Reno/Stead

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, aircraft N139UK
Age
61
Injuries
None
Certificate
Airline transport
Airplane ratings
Single-engine sea, Multi-engine land, Single-engine land, Multi-engine sea
Instrument ratings
Helicopter, Airplane
Medical
Class 2, With waivers/limitations
Seat
Front
Restraint
4-point
Flight hours
4,137 total · 50 in this make and model · 3,835 as pilot in command · 51 in the last 90 days · 14 in the last 30 days · 2 in the last 24 hours
Role
Pilot, aircraft N139PJ
Age
44
Injuries
None
Certificate
Airline transport
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 1, Without waivers/limitations
Last flight review
February 18, 2018
Seat
Front
Restraint
4-point
Flight hours
6,100 total · 70 in this make and model · 4,000 as pilot in command · 55 in the last 90 days · 24 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
100° at 6 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
61 °F, dew point 21 °F
Altimeter
30.04 inHg
Observed at
KRTS, 3 nm away

Docket · 6

The files NTSB released with the investigation on January 14, 2020, on NTSB’s docket system: statements, records, photos and specialists’ reports. 10.5 MB in all.

FAA reports on this event · 2

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.