LAX06LA009

NTSB accident investigation · Boeing 737-7H4 · Phoenix, AZ · October 13, 2005

Accident · No injuriesLimited investigationFinal report
Date
October 12, 2005, 20:18 local (Oct 13, 2005, 03:18 UTC)
Place
Phoenix, AZ
Injuries
137 uninjured
Phase of flight
Taxi
Aircraft
N755SABoeing 737-7H4N624SWBoeing 737-3H4
Weather
Visual (VMC) · Night
Status
Completed · report February 26, 2007
Report
Approved by Office Director
Parties
Federal Aviation Administration, Southwest Airlines, Inc., Southwest Airlines Pilot's Association
Case key
62654

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 failure of the other flight crew to maintain an adequate clearance from obstructions while taxiing.

failure of the flight crew to maintain an adequate clearance from a stationary Boeing 737.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

On ground/water collision with objectTaxi - from landing
Clearance - inadequateFlightcrewCause
Object - aircraft parked/standingFactor
On ground/water collision with objectStanding - engine(s) operating
Clearance - not maintainedFlightcrew of other aircraftCause
Object - aircraft moving on groundCause

Analysis

While taxiing to park the left winglet of a company Boeing 737, operating as flight 1097 (N755SW), struck and became embedded in the right horizontal stabilizer of a Boeing 737 (N624SW), operating as flight 2080. Flight 2080 was holding short of the active runway waiting to depart when the ground collision occurred. After landing, the crew of flight 1097 was cleared by the local ground controller to taxi to a holding area short of the flight's assigned gate and await further clearance to taxi to the gate for parking. During taxi, flight 1097 taxied behind the parked flight 2080. The captain of flight 1097 believed there was enough clearance between his airplane and flight 2080; however, the left winglet struck the right horizontal stabilizer. The area where the collision occurred is in a designated non-visibility area for the air traffic control tower and is considered a non-movement area where the responsibility for maintaining separation and clearance from other aircraft lies entirely with the flight crew.

While taxiing to park the left winglet of flight 1097 (N755SW) struck and became embedded in the right horizontal stabilizer of a company Boeing 737 (N624SW), operating as flight 2080. Flight 2080 was holding short of the active runway waiting to depart when the ground collision occurred. After landing, the crew of flight 1097 was cleared by the local ground controller to taxi to a holding area short of the flight's assigned gate and await further clearance to taxi to the gate for parking. During the taxi, flight 1097 taxied behind the parked flight 2080. The captain of flight 1097 believed there was enough clearance between his airplane and flight 2080; however, the left winglet struck the right horizontal stabilizer. The area where the collision occurred is in a designated non-visibility area for the air traffic control tower and is considered a non-movement area where the responsibility for maintaining separation and clearance from other aircraft lies entirely with the flight crew.

Factual narrative

History of Flight

On October 12, 2005, at 2018 mountain standard time, a Boeing 737-7H4, N755SA, collided with the tail of Boeing 737-3H4, N624SW, while taxiing to parking at Phoenix Sky Harbor International Airport (PHX), Phoenix, Arizona. Both airplanes were owned by Southwest Airlines, Inc., (SWA) and operated as domestic flights under the provisions of 14 CFR Part 121; flight 1097 (N755SA) and flight 2080 (N624SW). Flight 1097 sustained minor damage to its left winglet, and flight 2080 sustained substantial damage to its right horizontal stabilizer. There were no injuries to the 5 flight and cabin crew, and 71 passengers aboard flight 1097. There were also no injuries to the 5 flight and cabin crew, and 56 passengers aboard flight 2080. Night visual meteorological conditions prevailed, and instrument flight rule (IFR) flight plans had been filed for both airplanes. Flight 1097 departed Burbank, California, about 1858 Pacific daylight time, destined for PHX. Flight 2080 was waiting to depart at the time was destined for Reno, Nevada.

According to the captain's written statement, this was the last leg of a scheduled 4-day trip for flight 1097. After landing on runway 26, the PHX Ground Control North (GCN) controller instructed flight 1097 to taxi to spot 5, located between gate C-18 and taxiway intersection D-13, via taxiways "C" and "R." When they arrived at Spot 5, the flight crew of flight 1097 noted a company airplane (flight 2080) holding for takeoff at intersection D-13.

The flight crew of flight 1097 thought they had enough clearance to pass behind flight 2080 and proceed to parking at gate C-18. The captain of flight 1097 taxied slowly until it appeared the airplane had passed flight 2080, and proceeded to intercept the J-line when the flight crew felt the airplane shudder. The captain looked out the left window towards the wing and saw that the top portion of the left winglet was missing. He continued to taxi the airplane the remaining 20 feet to the gate, parked the airplane, and deplaned the passengers.

According to the flight crew of flight 2080, their airplane was stopped at D-13 with its parking brakes set, and were number 2 for takeoff on runway 25R behind a company airplane. The crew felt a noticeable impact and radioed to the tower that they might have been hit, and asked a nearby United Airlines airplane awaiting takeoff clearance to visually inspect their airplane for damage. The United Airlines crew reported that they had observed flight 1097 taxi into flight 2080's right rear horizontal stabilizer, and that the winglet from the other airplane was embedded in their stabilizer. The United Airlines crew also said that there were no fluids leaking from Flight 2080's airplane. The crew of flight 2080 requested and received a clearance from the tower to return to the gate and parked uneventfully.

Flight 1097 sustained damage to the upper half of the left winglet, which remained embedded in the right rear horizontal stabilizer of flight 2080. Flight 2080 sustained structural damage to the rear spar of the right rear horizontal stabilizer and its "T" chords.

Personnel Information

The crew of flight 1097 consisted of two pilots. The captain was seated in the left seat, and the first officer was seated in the right seat. The captain possessed an airline transport pilot certificate. He was type-rated in the Boeing 737, and had accumulated 13,390 total flight hours. The first officer possessed an airline transport pilot certificate. He was type-rated in the Boeing 737, and had accumulated 11,000 total flight hours.

The crew of flight 2080 consisted of two pilots. The captain, the flying pilot for the flight to Reno, was seated in the left seat, and the first officer was seated in the right seat. The captain held an airline transport pilot certificate, with a Boeing 737 type-rating. He reported a total flight time 27,300 hours. The first officer held an airline transport pilot certificate, with a Boeing 737 type-rating. He reported a total flight time of 9,000 hours.

Airport Information

Taxiway "R" runs north and south between runways 26 and 25R at PHX. Spot 5 is adjacent to taxiway "R", between D-13 and the east "C" gates. Spot 5 is a holding location area/spot for airplane's awaiting clearance to taxi into the east "C" gate area. Taxiway "R", Spot 5, and D-13 are all in an air traffic control non-visibility area, and as such, the Federal Aviation Administration designates it as non-movement area.

Flight Recorders

The airplane's Digital Flight Data Recorder (DFDR) and Digital Cockpit Voice Recorder (DCVR) were removed from the airplane and shipped to the Safety Board Vehicle Recorder laboratory in Washington, D.C., for analysis. The flight data recorder and cockpit voice recorder factual reports are included in the official docket for this accident.

History of Flight

On October 12, 2005, at 2018 mountain standard time, a Boeing 737-7H4, N755SA, collided with the tail of Boeing 737-3H4, N624SW, while taxiing to parking at Phoenix Sky Harbor International Airport (PHX), Phoenix, Arizona. Both airplanes were owned by Southwest Airlines, Inc., (SWA) and operated as domestic flights under the provisions of 14 CFR Part 121; flight 1097 (N755SA) and flight 2080 (N624SW). Flight 1097 sustained minor damage to its left winglet, and flight 2080 sustained substantial damage to its right horizontal stabilizer. There were no injuries to the 5 flight and cabin crew, and 71 passengers aboard flight 1097. There were also no injuries to the 5 flight and cabin crew, and 56 passengers aboard flight 2080. Night visual meteorological conditions prevailed, and instrument flight rule (IFR) flight plans had been filed for both airplanes. Flight 1097 departed Burbank, California, about 1858 Pacific daylight time, destined for PHX. Flight 2080 was waiting to depart at the time was destined for Reno, Nevada.

According to the captain's written statement, this was the last leg of a scheduled 4-day trip for flight 1097. After landing on runway 26, the PHX Ground Control North (GCN) controller instructed flight 1097 to taxi to spot 5, located between gate C-18 and taxiway intersection D-13, via taxiways "C" and "R." When they arrived at Spot 5, the flight crew of flight 1097 noted a company airplane (flight 2080) holding for takeoff at intersection D-13.

The flight crew of flight 1097 thought they had enough clearance to pass behind flight 2080 and proceed to parking at gate C-18. The captain of flight 1097 taxied slowly until it appeared the airplane had passed flight 2080, and proceeded to intercept the J-line when the flight crew felt the airplane shudder. The captain looked out the left window towards the wing and saw that the top portion of the left winglet was missing. He continued to taxi the airplane the remaining 20 feet to the gate, parked the airplane, and deplaned the passengers.

According to the flight crew of flight 2080, their airplane was stopped at D-13 with its parking brakes set, and were number 2 for takeoff on runway 25R behind a company airplane. The crew felt a noticeable impact and radioed to the tower that they might have been hit, and asked a nearby United Airlines airplane awaiting takeoff clearance to visually inspect their airplane for damage. The United Airlines crew reported that they had observed flight 1097 taxi into flight 2080's right rear horizontal stabilizer, and that the winglet from the other airplane was embedded in their stabilizer. The United Airlines crew also said that there were no fluids leaking from Flight 2080's airplane. The crew of flight 2080 requested and received a clearance from the tower to return to the gate and parked uneventfully.

Flight 1097 sustained damage to the upper half of the left winglet, which remained embedded in the right rear horizontal stabilizer of flight 2080. Flight 2080 sustained structural damage to the rear spar of the right rear horizontal stabilizer and its "T" chords.

Personnel Information

The crew of flight 1097 consisted of two pilots. The captain was seated in the left seat, and the first officer was seated in the right seat. The captain possessed an airline transport pilot certificate. He was type-rated in the Boeing 737, and had accumulated 13,390 total flight hours. The first officer possessed an airline transport pilot certificate. He was type-rated in the Boeing 737, and had accumulated 11,000 total flight hours.

The crew of flight 2080 consisted of two pilots. The captain, the flying pilot for the flight to Reno, was seated in the left seat, and the first officer was seated in the right seat. The captain held an airline transport pilot certificate, with a Boeing 737 type-rating. He reported a total flight time 27,300 hours. The first officer held an airline transport pilot certificate, with a Boeing 737 type-rating. He reported a total flight time of 9,000 hours.

Airport Information

Taxiway "R" runs north and south between runways 26 and 25R at PHX. Spot 5 is adjacent to taxiway "R", between D-13 and the east "C" gates. Spot 5 is a holding location area/spot for airplane's awaiting clearance to taxi into the east "C" gate area. Taxiway "R", Spot 5, and D-13 are all in an air traffic control non-visibility area, and as such, the Federal Aviation Administration designates it as non-movement area.

Flight Recorders

The airplane's Digital Flight Data Recorder (DFDR) and Digital Cockpit Voice Recorder (DCVR) were removed from the airplane and shipped to the Safety Board Vehicle Recorder laboratory in Washington, D.C., for analysis. The flight data recorder and cockpit voice recorder factual reports are included in the official docket for this accident.

Aircraft · 2

Registration
N755SA
Reported as
Boeing 737-7H4
Category
Airplane
Serial number
27871
Engines
General Electric CFM-56, 24,000 lbs thrust, turbo fanGeneral Electric CFM-56, 24,000 lbs thrust, turbo fan
Damage
Minor damage
Flight
Part 121
Registered owner
Southwest Airlines Co.
Airworthiness certificate
Standard, Transport
Departed
BUR · Burbank, CA
Destination
PHX · Phoenix, AZ
Flight plan
IFR
Airport
PHX · Phoenix Sky Harbor Intl

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
N624SW
Reported as
Boeing 737-3H4
Category
Airplane
Serial number
27934
Engines
General Electric CFM-56, 24,000 lbs thrust, turbo fanGeneral Electric CFM-56, 24,000 lbs thrust, turbo fan
Damage
Substantial damage
Flight
Part 121
Registered owner
Southwest Airlines Co.
Airworthiness certificate
Standard, Transport
Departed
PHX · Phoenix, AZ
Destination
RNO · Reno, NV
Flight plan
IFR
Airport
PHX · Phoenix Sky Harbor Intl

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 · 4

As NTSB recorded them. NTSB leaves out names.

Role
Pilot, aircraft N755SA
Age
57
Injuries
None
Certificate
Airline transport
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 1
Last flight review
May 1, 2005
Seat
Left
Flight hours
13,390 total · 11,100 in this make and model · 9,000 as pilot in command · 233 in the last 90 days · 94 in the last 30 days · 7 in the last 24 hours
Role
Co-pilot, aircraft N755SA
Age
43
Injuries
None
Certificates
Flight instructor, Airline transport
Airplane ratings
Single-engine land, Multi-engine land, Single-engine sea
Instrument ratings
Airplane
Medical
Class 1
Last flight review
March 1, 2005
Seat
Right
Flight hours
11,000 total · 4,000 in this make and model · 170 in the last 90 days · 50 in the last 30 days · 7 in the last 24 hours
Role
Pilot, aircraft N624SW
Age
52
Injuries
None
Certificates
Commercial, Airline transport, Flight instructor
Airplane ratings
Single-engine sea, Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1
Last flight review
November 1, 2004
Seat
Left
Flight hours
27,300 total · 16,000 in this make and model · 20,000 as pilot in command · 203 in the last 90 days · 81 in the last 30 days · 7 in the last 24 hours
Role
Co-pilot, aircraft N624SW
Age
40
Injuries
None
Certificates
Military, Airline transport
Airplane ratings
Multi-engine land
Instrument ratings
Airplane
Medical
Class 1
Last flight review
January 1, 2005
Seat
Right

Weather

Conditions
Visual (VMC) · Night
Wind
220° at 5 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
79 °F, dew point 27 °F
Altimeter
29.88 inHg
Observed at
PHX

FAA reports on this event · 2

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