DCA16CA139

NTSB accident investigation · Bombardier CL 600 2B19 · San Francisco, CA · April 29, 2016

Accident · No injuriesData collectionFinal report
Date
April 28, 2016, 22:52 local (Apr 29, 2016, 05:52 UTC)
Place
San Francisco, CA
Injuries
30 uninjured
Damage
Substantial damage
Phase of flight
Standing
Aircraft
N961SWBombardier CL 600 2B19
Defining event
Standing-engine(s) operating: Ground handling event
Weather
Visual (VMC) · Night
Status
Completed · report April 22, 2020
Report
Approved by Office Director
NTSB office
Major Investigations Division
Case key
93084

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 tug driver's failure to comply with the wing walkers direction to stop, which resulted in the towed airplane colliding with N961SW.

Findings · 1

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.

Towing and taxiing: towingAircraft › Aircraft handling/service · Incorrect use/operationBombardier CL-600-2B19: 1 caseAll aircraft: 10 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

On April 28, 2016, about 2252 pacific daylight time, SkyWest Airlines flight 5260, N961SW, a Canadair CRJ-200, was struck after being pushed back from the gate by an airplane that was being towed by maintenance personnel at San Francisco International Airport (KSFO), San Francisco, California. There were no injuries and both airplanes received substantial damage. The regularly scheduled domestic passenger flight was operating under the provisions of 14 Code of Federal Regulations Part 121 from KSFO to Meadows Field Airport (KBFL), Bakersfield, California. After having been pushed back from the gate, N961SW was awaiting taxi clearance with engines operating and the parking brake set when it was struck by the Boeing 777 that was being reposition under tow. The tug driver that was pushing the Boeing 777indicated that he saw wing walkers on both sides and began to push back. He stated that he never saw any signal from the wing walker's signal wands indicating to stop. The left wing walker stated that the tow driver started pushing the Boeing 777 in reverse before asking if he and the other walkers were ready stating, that the airplane "was halfway out of the gate before I could react." He stated that, after the airplane entered the roadway, he notice that the tug driver was not slowing down as he approached N961SW. The left wing walk made an "X" with his signal wands and then started jumping up and down and moving to better location to be seen. The Boeing 777's lower left fuselage contacted the right stabilizer of N961SW resulting in substantial damage to the stabilizer and right elevator.

Factual narrative

On April 28, 2016, about 2252 pacific daylight time, SkyWest Airlines flight 5260, N961SW, a Canadair CRJ-200, was struck after being pushed back from the gate by an airplane that was being towed by maintenance personnel at San Francisco International Airport (KSFO), San Francisco, California. There were no injuries and both airplanes received substantial damage. The regularly scheduled domestic passenger flight was operating under the provisions of 14 Code of Federal Regulations Part 121 from KSFO to Meadows Field Airport (KBFL), Bakersfield, California. After having been pushed back from the gate, N961SW was awaiting taxi clearance with engines operating and the parking brake set when it was struck by the Boeing 777 that was being reposition under tow. The tug driver that was pushing the Boeing 777indicated that he saw wing walkers on both sides and began to push back. He stated that he never saw any signal from the wing walker's signal wands indicating to stop. The left wing walker stated that the tow driver started pushing the Boeing 777 in reverse before asking if he and the other walkers were ready stating, that the airplane "was halfway out of the gate before I could react." He stated that, after the airplane entered the roadway, he notice that the tug driver was not slowing down as he approached N961SW. The left wing walk made an "X" with his signal wands and then started jumping up and down and moving to better location to be seen. The Boeing 777's lower left fuselage contacted the right stabilizer of N961SW resulting in substantial damage to the stabilizer and right elevator.

Aircraft

Registration
N961SW
Reported as
Bombardier CL 600 2B19 (100)
Category
Airplane
Serial number
7857
Built
2003
Engines
GE CF34 SERIES, 9,140 horsepower, turbo fanGE CF34 SERIES, 9,140 horsepower, turbo fan
Damage
Substantial damage
Flight
Part 121
Operator
Skywest Airlines Inc
Registered owner
Skywest Airlines Inc
Airworthiness certificate
Standard, Transport
Departed
SFO · San Francisco, CA
Destination
Bakersfield, CA
Flight plan
IFR
Airport
SFO · San Francisco International

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
47
Injuries
None
Certificate
Airline transport
Airplane ratings
Multi-engine land
Instrument ratings
Airplane
Medical
Class 1
Seat
Left
Restraint
5-point
Flight hours
7,310 total · 733 in this make and model
Role
Co-pilot
Age
30
Injuries
None
Certificate
Airline transport
Airplane ratings
Multi-engine land
Instrument ratings
Airplane
Seat
Right
Restraint
5-point
Flight hours
3,651 total · 1,383 in this make and model

Weather

Conditions
Visual (VMC) · Night

Docket · 2

The files NTSB released with the investigation on October 9, 2020, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.4 MB in all.