DCA11CA073

NTSB accident investigation · Boeing 757-222 · San Fransico, CA · June 12, 2011

Accident · No injuriesData collectionFinal report
Date
June 11, 2011, 17:58 local (Jun 12, 2011, 00:58 UTC)
Place
San Fransico, CA
Injuries
190 uninjured
Damage
Substantial damage
Phase of flight
Pushback/towing
Aircraft
N571UABoeing 757-222
Defining event
Pushback/tow-engine not oper: Ground handling event
Weather
Visual (VMC) · Day
Status
Completed · report August 31, 2011
Report
Approved by Office Director
NTSB office
Major Investigations Division
Parties
United Airlines
Case key
80839

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

The ramp personnel's failure to visually verify the position of the jetway before beginning the airplane pushback.

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 taxiingAircraft › Aircraft handling/service · Incorrect use/operationAll aircraft: 2 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.

Ground handling eventPushback/tow-engine not operAll aircraft: 108 casesDefining event

Analysis

On June 16, 2011 at approximately 1758 pacific daylight time, United flight 818, a Boeing 757-200, registration N571UA, was substantially damaged during initial pushback from gate 73 at San Francisco International Airport (SFO), San Francisco, California. There were no injuries to the 188 passengers and crew onboard. The flight was a regularly scheduled domestic passenger flight from SFO to Chicago O'Hare International Airport, Chicago, Illinois. United representatives reported that normal passenger and crew boarding was accomplished using door 2L. The passenger loading bridge (PLB) operator stated she was in position at the loading bridge controls and was prepared to retract the bridge. She reported that the airplane door was closed and the loading bridge canopy was retracted. The PLB operator stated she was waiting for hand signal guidance from the ramp personnel to retract the bridge from the airplane. The PLB operator stated the signal to retract the bridge from the airplane was not received, however, the ramp personnel proceeded to push back the airplane. The ramp employee responsible for the airplane pushback reported that he heard the PLB bell ringing for about one minute, which he thought was enough time for the jetway to be cleared from the airplane. He reported that he then removed the chalks, received clearance from the flight crew, and then commenced to push back the airplane. As a result of the impact with the jetway, the airplane received a 38 inch x 8.5 inch hole in the fuselage between Fuselage Station (FS) 490 and FS 528 and stringer S-17L and S-18L resulting in damage to frame assemblies and stringers in this area.

Factual narrative

On June 16, 2011 at approximately 1758 pacific daylight time, United flight 818, a Boeing 757-200, registration N571UA, was substantially damaged during initial pushback from gate 73 at San Francisco International Airport (SFO), San Francisco, California. There were no injuries to the 188 passengers and crew onboard. The flight was a regularly scheduled domestic passenger flight from SFO to Chicago O'Hare International Airport, Chicago, Illinois. United representatives reported that normal passenger and crew boarding was accomplished using door 2L. The passenger loading bridge (PLB) operator stated she was in position at the loading bridge controls and was prepared to retract the bridge. She reported that the airplane door was closed and the loading bridge canopy was retracted. The PLB operator stated she was waiting for hand signal guidance from the ramp personnel to retract the bridge from the airplane. The PLB operator stated the signal to retract the bridge from the airplane was not received, however, the ramp personnel proceeded to push back the airplane. The ramp employee responsible for the airplane pushback reported that he heard the PLB bell ringing for about one minute, which he thought was enough time for the jetway to be cleared from the airplane. He reported that he then removed the chalks, received clearance from the flight crew, and then commenced to push back the airplane. As a result of the impact with the jetway, the airplane received a 38 inch x 8.5 inch hole in the fuselage between Fuselage Station (FS) 490 and FS 528 and stringer S-17L and S-18L resulting in damage to frame assemblies and stringers in this area.

Aircraft

Registration
N571UA
Reported as
Boeing 757-222
Category
Airplane
Serial number
26681
Airframe hours
61,787
Engines
P & W PW2040, 40,900 lbs thrust, turbo jetP & W PW2040, 40,900 lbs thrust, turbo jet
Damage
Substantial damage
Flight
Part 121
Operator
United Air Lines Inc
Registered owner
United Air Lines Inc
Airworthiness certificate
Standard, Transport
Last inspection
Continuous airworthiness · May 25, 2011
Departed
KSFO · San Fransico, CA
Destination
KORD · Chicago, IL
Flight plan
IFR
Airport
KSFO · San Francisco International

Flight crew · 2

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
54
Injuries
None
Certificates
Commercial, Airline transport
Airplane ratings
Multi-engine sea, Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 1, Unknown
Last flight review
February 1, 2011
Seat
Left
Flight hours
13,678 total · 2,949 in this make and model
Role
Co-pilot
Age
46
Injuries
None
Certificate
Airline transport
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Powered-lift
Medical
Class 1, Unknown
Last flight review
May 1, 2011
Seat
Right
Flight hours
4,907 total · 3,574 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
315° at 13 knots
Visibility
10 statute miles
Temperature
63 °F, dew point 46 °F