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Date:Thursday 26 November 2015
Type:Silhouette image of generic B733 model; specific model in this crash may look slightly different
Boeing 737-322
Registration: XA-UNM
MSN: 24248/1636
First flight: 1988-11-01 (27 years 1 months)
Total airframe hrs:64171
Engines: 2 CFMI CFM56-3C1
Crew:Fatalities: 0 / Occupants: 5
Passengers:Fatalities: 0 / Occupants: 139
Total:Fatalities: 0 / Occupants: 144
Aircraft damage: Substantial
Aircraft fate: Written off (damaged beyond repair)
Location:Mexico City-Benito Juárez International Airport (MEX) (   Mexico)
Phase: Landing (LDG)
Nature:Domestic Scheduled Passenger
Departure airport:Cancún Airport (CUN/MMUN), Mexico
Destination airport:Mexico City-Benito Juárez International Airport (MEX/MMMX), Mexico
A Boeing 737-322 operating flight GMT779 from Cancún suffered a landing gear collapsed after landing at Mexico City-Benito Juárez International Airport (MEX).
The aircraft was 10 nautical miles out when the crew requested a visual approach for a landing on runway 05L. Wind was reported as variable 130-160 degrees. The flight was subsequently cleared for their requested approach.
After touchdown the aircraft experienced a strong vibration, after which the left-hand main landing gear collapsed.

Probable Cause:

Probable cause:
"Fracture of the shimmy damper piston and subsequent retraction of the left leg assembly of the landing gear due to vibrations caused during the landing run, which could not be damped due to wear and play existing between the dynamic parts of the links, fittings and apex joint of the shimmy damper".

- Unstabilized approach
- Inadequate service to shimmy damper and shock strut
- Landing with a low rate of descent
- Wear in the Apex joint due to a play between this and the lower torsion link
- Landing with high ground speed and low descent rate

Accident investigation:
Investigating agency: CIDAIA Mexico
Status: Investigation completed
Duration: 2 years and 10 months
Accident number: ACCDTAFA058/2015MMMX
Download report: Final report
Language: Spanish

Landing gear collapse
Runway mishap


METAR Weather report:
00:42 UTC / 18:42 local time:
MMMX 270042Z 12010KT 7SM FEW020 SCT200 21/09 A3025 NOSIG RMK 8/402 HZY

01:43 UTC / 19:43 local time:
MMMX 270143Z 18005KT 8SM FEW020 SCT200 20/09 A3028 NOSIG RMK 8/402 HZY AC

23:43 UTC / 17:43 local time:
MMMX 262343Z 15009KT 7SM FEW020 BKN200 22/09 A3024 NOSIG RMK SLP071 57005 951 8/202 HZY


photo of Boeing-737-322-XA-UNM
accident date: 26-11-2015
type: Boeing 737-322
registration: XA-UNM
photo of Boeing-737-322-
Boeing 737 main gear torsion links

Video, social media

Aircraft history
date registration operator remarks
1 November 1988 N344UA Boeing first flight
16 November 1988 N344UA United Airlines delivered
27 October 1989 N344UA United Airlines Incident: Returned to Rapid City, SD, due to smoke and odor in cabin
22 November 2004 PR-GLD GOL Transportes Aéreos
23 March 2010 N187AQ Bank of Utah Trustee
25 March 2010 XA-UNM Magnicharters

This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Cancún Airport to Mexico City-Benito Juárez International Airport as the crow flies is 1277 km (798 miles).
Accident location: Approximate; accuracy within a few kilometers.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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