CEN22LA195

NTSB accident investigation · Swearingen SA226-T(B) · Denver, CO · May 6, 2022

Accident · No injuriesClass 3 · LimitedFinal report
Date
May 5, 2022, 21:10 local (May 6, 2022, 03:10 UTC)
Place
Denver, CO
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N36LCSwearingen SA226-T(B)
Defining event
Landing: Runway excursion
Weather
Visual (VMC) · Night
Status
Completed
Report
Approved by Office Director
Investigation class
Class 3
NTSB office
Central Region
Parties
Flight Standards District Office
FAA report
20220506004249A
Case key
105063

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 captain’s failure to ensure that the parking brake was correctly released before takeoff, which resulted in seized brakes during landing and a subsequent loss of directional control and runway excursion.

Findings · 3

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 captain reported slower than normal acceleration during the takeoff roll. At 60 to 80 knots, the captain “pushed in the parking brake” handle and continued the takeoff. The crew reported no anomalies on the departure or while en route. While landing at the destination, the airplane swerved right and the captain lost directional control, which resulted in a runway excursion and substantial damage to the right wing. Postaccident examination revealed that the right main landing gear brakes were seized and the right main landing gear tires had flat spots down to the wheel rims, consistent with no tire rotation during landing. No preaccident anomalies were observed with the braking system that would have precluded normal operation. According to the flight manual, proper release of the parking brake required the brake pedals to be depressed while the parking brake handle was pushed fully forward. The parking brake was likely not correctly released before takeoff, which allowed the right brakes to retain pressure and led to the loss of directional control during landing.

Factual narrative

On May 5, 2022, about 2110 mountain daylight time, a Swearingen SA226-T(B), N36LC, was substantially damaged when it was involved in an accident at Centennial Airport (APA), Denver, Colorado. The captain and first officer were not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 positioning flight. After six passengers disembarked at Central Nebraska Regional Airport (GRI), Grand Island, Nebraska, the captain and first officer departed from GRI without passengers. During the takeoff roll, the captain reported that the airplane accelerated slower than normal. At 60 to 80 knots, the captain “pushed in the parking brake” handle and continued the takeoff. The crew reported no anomalies on the departure or en route to APA. During the landing at APA, the airplane swerved right, and the captain was not able to maintain directional control. The airplane departed the right side of the runway, which resulted in substantial damage to the right wing. Postaccident examination revealed that the right main landing gear brakes were thermally damaged and seized. The right main landing gear tires had flat spots down to the wheel rims, consistent with no tire rotation during the landing. The left main landing gear brakes were not seized and the tires did not have flat spots. No anomalies were observed with the braking system that would have precluded normal operation. According to the flight manual, proper release of the parking brake required brake pedals to be depressed while the parking brake handle was pushed fully forward. If the parking brake handle was pushed forward without the brake pedals depressed, it was possible for the brakes to retain pressure.

Aircraft

Registration
N36LC
Reported as
Swearingen SA226-T(B)
Category
Airplane
Serial number
T-387
Built
1980
Airframe hours
9,025
Engine
Honeywell TPE331-10U-512, 900 horsepower, turbo prop
Damage
Substantial damage
Flight
Positioning · Part 91
Operator
Cloud Peak Aviation, doing business as Mauna Hele
Registered owner
N360lc Ltd
Airworthiness certificate
Standard, Normal
Last inspection
AAIP · April 27, 2022 · 20 hours before
Departed
GRI · Grand Island, NE
Destination
APA · Denver, CO
Flight plan
IFR
Airport
APA · Centennial Airport, runway 35R, 10,001 × 100 ft, asphalt
Equipment
Electronic flight bag or handheld device, Stall warning system, ADS-B, Angle of attack indicator, Auto-pilot

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
None
Certificate
Airline transport
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 1, With waivers/limitations
Last flight review
February 5, 2022
Seat
Left
Flight hours
4,000 total · 800 in this make and model · 88 in the last 90 days · 6 in the last 30 days · 4 in the last 24 hours
Role
Co-pilot
Age
29
Injuries
None
Certificate
Commercial
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 1, Without waivers/limitations
Last flight review
December 6, 2021
Seat
Right
Flight hours
434 total · 163 in this make and model · 197 as pilot in command · 84 in the last 90 days · 50 in the last 30 days · 5 in the last 24 hours

Weather

Conditions
Visual (VMC) · Night
Wind
90° at 7 knots
Visibility
10 statute miles
Temperature
57 °F, dew point 37 °F
Altimeter
29.69 inHg
Observed at
KAPA
METAR
KAPA 070253Z 09007KT 10SM FEW110 FEW140 SCT220 14/03 A2969 RMK AO2 SLP991 T01390028 53051 $

Docket · 5

The files NTSB released with the investigation on November 8, 2023, on NTSB’s docket system: statements, records, photos and specialists’ reports. 4.5 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.