As of December 2017, at least 11 shortcomings of aircraft maintenance and one of civil aviation security of Global Air were known to Mexico’s General Directorate of Civil Aviation (DGAC).

The airline had solved only two of 14  abnormalities detected by the aeronautical authority. Shortcomings, some of which related to a maintenance of the B737-200 that later crashed, are mainly related to failures at keeping an accurate logbook. These documents record the most important operational parameters of an aircraft such as maintenance, failures before or during a flight, actions taken in this respect and operating times.

Although the DGAC determined six occurrences when Global Air failed to provide documentation of correcting errors, the XA-UHZ aircraft remained in operation until crashing in Cuba on May 18, 2018, killing 112 people onboard.

Chain of irregularities

Between November 21 and 24, 2017, the Mexican aeronautical authority carried out the review of Global Air in respect to technical, financial, legal and administrative aspects. According to the DGAC, areas of operations, pilots, flight attendants, training of aeronautical technical personnel, maintenance and civil aviation security were reviewed at the time.

On December 1, 2017, the DGAC determined that Global Air, belonging to Aerolíneas Damojh SA de CV, only fully resolved two of the 14 irregularities detected during the review.

Among the failures were the following: use of unauthorized log formats in the General Maintenance Manual and Workshop Procedures, Chapters 13 to 18. A shortcoming was also detected of another B737-200 (XA-UMQ), indicating that similar issues could be found with aircraft within Global Air’s fleet.

Other findings indicated spare parts changes not reported in the logs, including changes of  emergency slides, slide cylinders and oxygen cylinders and other. The Global Air technicians also failed to report changes of  "components limited by time" such as two electronic altimeters and Mach airspeed indicator.

In addition, tests of static pitot system and transponder, conducted on April 7, 2017, were not reported, neither were weight and balance of aircraft. Irregularities were also detected in the equipment on land assigned to the maintenance workshop that Global Air had at the Celaya Airport in Guanajuato, where runway is not suitable for landing B737 aircraft, as confirmed by several technicians and pilots.

In response to these and other findings, in December 2017, the DGCA warned the airline of pending sanctioning procedure if the failures are not corrected.

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The crash of the Cubana Air’s airliner XA-UHZ on May 18, 2018, in Havana resulted in deaths of 110  victims, leaving three survivors who are now being treated for heavy injuries. The cockpit voice recorder of the aircraft have been recovered and the investigation has started to identify what caused the accident.