CEN25LA356

NTSB accident investigation · Sikorsky S-76 · Round Mountain, TX · September 1, 2025

Accident · Serious injuriesClass 3 · LimitedFinal report
Date
August 31, 2025, 21:02 local (Sep 1, 2025, 02:02 UTC)
Place
Round Mountain, TX
Injuries
3 serious
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N36RPSikorsky S-76
Defining event
Landing: Collision during takeoff/land
Weather
Visual (VMC) · Night/dark
Status
Completed · report August 25, 2026
Report
Approved by Office Director
Investigation class
Class 3
NTSB office
Central Region
Parties
Pratt & Whitney Canada, FAA San Antonio FSDO, Transportation Safety Board of Canada
FAA report
20250831012969A
Case key
200918

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 flight crew’s failure to properly identify the heliport in dark night conditions, which resulted in the flight crew attempting to land and a subsequent impact with trees and terrain.

Findings · 8

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.

Light condition: darkEnvironmental issues › Conditions/weather/phenomena · Effect on operationSikorsky S-76D: 1 caseAll aircraft: 448 casesProbable cause
Attention/monitoring: task monitoring/vigilancePersonnel issues › Psychological · Flight crewSikorsky S-76D: 1 caseAll aircraft: 330 casesProbable cause
Info processing/decision: identification/recognitionPersonnel issues › Action/decision · Flight crewSikorsky S-76D: 1 caseAll aircraft: 559 casesProbable cause
Info processing/decision: decision making/judgmentPersonnel issues › Action/decision · Flight crewSikorsky S-76D: 1 caseAll aircraft: 3,098 casesProbable cause
Action: incorrect action performancePersonnel issues › Action/decision · Flight crewSikorsky S-76D: 1 caseAll aircraft: 1,386 casesProbable cause
Navigation systemAircraft › Aircraft systems · Incorrect use/operationSikorsky S-76D: 1 caseAll aircraft: 13 cases

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 purpose of the on-demand night flight in the helicopter was to transport the passenger from a commercial airport to a private heliport on a ranch in a rural area. Due to previous issues with the helicopter’s autopilot system and the possible concern of losing control in instrument meteorological conditions, the captain decided not to perform an instrument flight rules flight to the heliport. During the flight, an instrument approach was loaded into the helicopter’s flight management system, but it was not activated. Additionally, each pilot had an Apple iPad mounted in the cockpit, that was utilizing ForeFlight with the heliport coordinates loaded into ForeFlight. During the approach to the heliport, the captain contacted the ranch manager via text message on a cellular phone, to ensure the heliport floodlight system was activated. The first officer activated the heliport ground lights, which were a green color, via a radio frequency. Both pilots acknowledged observing green lights in their sight. The captain reported that he “cross-checked” the map display with the outside visual references to confirm alignment with the heliport, which he thought had matched. The first officer extended the landing gear, he completed the before landing checklist, and he then transitioned to viewing outside of the helicopter to try and visually acquire the heliport. The captain delayed turning on the landing lights until closer to the heliport to avoid glare from moisture and haze reflecting in the light beams. The captain began maneuvering the helicopter for landing. Within seconds, the captain lost outside visual references, and he transitioned to instruments. The first officer looked inside the cockpit and observed the radar altimeter indicated 20 ft. Before the first officer could verbally call out to execute a go around, the helicopter terrain awareness and warning system activated an alert, and the helicopter impacted trees and terrain. The helicopter sustained substantial damage to the fuselage, the main rotor system, the tail boom, the empennage, and the tail rotor system. The captain reported there were no preimpact mechanical malfunctions or failures with the airframe or the two turboshaft engines that would have precluded normal operation. A review of meteorological data at the time of the accident showed dark night conditions were present for the accident site. It is likely the flight crew failed to properly identify the heliport in dark night conditions, which resulted in the flight crew attempting to land at the incorrect location. It is also likely the flight crew failed to properly utilize navigation information and visual cues to verify the location of the heliport.

Factual narrative

On August 31, 2025, about 2102 central daylight time, a Sikorsky S-76D helicopter, N36RP, sustained substantial damage when it was involved in an accident near Round Mountain, Texas. The captain, the first officer, and the passenger sustained serious injuries. The helicopter was operated by Paradigm Helicopters, LLC, as a Title 14 Code of Federal Regulations Part 135 on-demand flight. The purpose of the unaided night flight in the transport category helicopter was to transport the passenger from a commercial airport to a private heliport on a ranch in a rural area. Due to previous issues with the helicopter’s autopilot system and the possible concern of losing control in instrument meteorological conditions, the captain decided not to perform an instrument flight rules flight to the heliport. Prior to the flight, the captain completed the operator’s flight risk assessment tool. During the flight, an instrument approach was loaded into the helicopter’s flight management system, but it was not activated. Additionally, each pilot had an Apple iPad mounted in the cockpit, that was utilizing ForeFlight with the heliport coordinates loaded into ForeFlight. During the approach to the heliport, the captain contacted the ranch manager via text message on a cellular phone, to ensure the heliport floodlight system was activated. The first officer activated the heliport ground lights, which were a green color, via a radio frequency. Both pilots acknowledged observing green lights in their sight. The captain reported that he “cross-checked” the map display with the outside visual references to confirm alignment with the heliport, which he thought had matched. The first officer extended the landing gear, he completed the before landing checklist, and he then transitioned to viewing outside of the helicopter to try and visually acquire the heliport. The captain delayed turning on the landing lights until closer to the heliport to avoid glare from moisture and haze reflecting in the light beams. The captain began maneuvering the helicopter for landing. Within seconds, the captain lost outside visual references, and he transitioned to instruments. The first officer looked inside the cockpit and observed the radar altimeter indicated 20 ft. Before the first officer could verbally call out to execute a go around, the helicopter terrain awareness and warning system activated an alert, and the helicopter impacted trees and terrain. The helicopter came to rest on its right side. The first officer, who then moved the two engine throttle levers to what he believed was the stop position, was able to egress from the helicopter on his own, while the captain and the passenger were assisted by witnesses and first responders. The captain reported that he previously landed at the heliport between 20 to 25 times, during both day and night conditions, and that he did not recall experiencing any visual illusions during the accident flight. The first officer reported that hepreviously landed at the heliport 20 times, but only during day conditions. The accident site, which was a heavily wooded area near a recreational vehicle park on private property, was about 1.54 miles north of the heliport, and a prominent west to east running river separates the two locations. A review of meteorological data at the time of the accident showed dark night conditions were present for the accident site. While the flight crew reported checking meteorological data from several enroute locations, they did not report checking meteorological data from the closest weather stations near the heliport. The helicopter sustained substantial damage to the fuselage, the main rotor system, the tail boom, the empennage, and the tail rotor system. The captain reported there were no preimpact mechanical malfunctions or failures with the airframe or the two turboshaft engines that would have precluded normal operation. The operator reported that the accident could have been prevented by implementing a night vision goggle program for non-airport operations.

Aircraft

Registration
N36RP
Reported as
Sikorsky S-76 (D)
Category
Helicopter
Serial number
761037
Built
2013
Airframe hours
1,005.2
Engines
Pratt & Whitney Canada PW210S, 1,077 horsepower, turbo shaftPratt & Whitney Canada PW210S, 1,077 horsepower, turbo shaft
Damage
Substantial damage
Flight
Part 135
Operator
Paradigm Helicopters LLC, doing business as Paradigm Helicopters LLC
Registered owner
Mirasol Sky LLC
Airworthiness certificate
Standard, Transport
Last inspection
100 hour · August 4, 2025 · 3.6 hours before
Departed
DAL · Dallas, TX
Destination
TA22 · Dripping Springs, TX
Flight plan
Company VFR
Airport
TA22 · Mirasol Hills, runway Helipad H1, 10 × 10 ft, grass/turf
Equipment
Electronic flight bag or handheld device, Electronic multifunction display, Electronic primary flight display, Onboard weather, ADS-B, Auto-pilot, Data recorder

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
64
Injuries
Serious
Certificate
Commercial
Instrument ratings
Helicopter
Medical
Class 2, With waivers/limitations
Last flight review
April 4, 2025
Seat
Right
Restraint
5-point
Flight hours
13,043 total · 344 in this make and model · 12,125 as pilot in command · 14 in the last 90 days · 3 in the last 30 days · 1 in the last 24 hours
Role
Co-pilot
Age
55
Injuries
Serious
Certificates
Private, Flight instructor, Commercial, Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Helicopter, Airplane
Medical
Class 1, With waivers/limitations
Last flight review
May 9, 2025
Seat
Left
Restraint
5-point
Flight hours
6,160 total · 56 in this make and model · 3,165 as pilot in command · 151 in the last 90 days · 21 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Night/dark
Wind
60° at 3 knots
Visibility
7 statute miles
Temperature
73 °F, dew point 73 °F
Altimeter
30.08 inHg
Observed at
KRYW, 14 nm away
METAR
METAR KRYW 010215Z AUTO 06003KT 7SM -RA SCT005 23/23 A3008 RMK AO2 T02260226=

Docket · 23

The files NTSB released with the investigation on August 19, 2026, on NTSB’s docket system: statements, records, photos and specialists’ reports. 78.8 MB in all.

Pilot/operator aircraft accident report, NTSB form 6120.1Item 1 · PDF · 10 pages · 1.5 MBInvestigation photographsItem 2 · PDF · 11 pages · 2.9 MBAccident flight route - google earth pro imageryItem 3 · PDF · 1 page · 381 KBAccident flight ADS-B data - google earth pro (.kmz file)Item 4 · KMZ · 248 KBAccident flight ADS-B data - microsoft excel (.xlsx file)Item 5 · XLSX · 10.3 MBCaptain - statementItem 6 · PDF · 2 pages · 86 KBCaptain - interviewItem 7 · PDF · 5 pages · 153 KBCaptain - recent flight duty timesItem 8 · PDF · 1 page · 63 KBCaptain - training records excerptItem 9 · PDF · 4 pages · 4.0 MBFirst officer - statementItem 10 · PDF · 2 pages · 69 KBFirst officer - interviewItem 11 · PDF · 4 pages · 122 KBFirst officer - recent flight duty timesItem 12 · PDF · 1 page · 62 KBFirst officer - training records excerptItem 13 · PDF · 4 pages · 2.7 MBPassenger - statementItem 14 · PDF · 1 page · 51 KBWitness - statementItem 15 · PDF · 1 page · 23 KBWeather factual reportItem 16 · PDF · 11 pages · 894 KBMirasol sky LLC - flight logItem 17 · PDF · 1 page · 47.1 MBParadigm helicopters LLC - crew trip sheetItem 18 · PDF · 2 pages · 71 KBParadigm helicopters LLC - flight risk assessment toolItem 19 · PDF · 9 pages · 653 KBParadigm helicopters LLC - previous autopilot system issues documentsItem 20 · PDF · 10 pages · 4.5 MBParadigm helicopters LLC - recent airframe and engines maintenance recordsItem 21 · PDF · 6 pages · 2.6 MBSikorsky aircraft corporation - S-76D rotorcraft flight manual excerptsItem 22 · PDF · 10 pages · 160 KBRelease of aircraft wreckage, NTSB form 6120.15Item 23 · PDF · 1 page · 116 KB

FAA reports on this event · 1

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