Serious incident Airbus A330-243 (P2F) EI-MAA, Sunday 24 September 2023

You can contribute by submitting additional or updated information.

Date:	Sunday 24 September 2023
Time:	03:40 UTC
Type:	Airbus A330-243 (P2F)
Owner/operator:	Mas Air
Registration:	EI-MAA
MSN:	854
Year of manufacture:	2007
Total airframe hrs:	63004 hours
Cycles:	11068 flights
Engine model:	Rolls-Royce Trent 772-B60
Fatalities:	Fatalities: 0 / Occupants: 3
Other fatalities:	0
Aircraft damage:	Minor, repaired
Category:	Serious incident
Location:	Anchorage - United States of America
Phase:	Initial climb
Nature:	Cargo
Departure airport:	Anchorage-Ted Stevens International Airport, AK (ANC/PANC)
Destination airport:	Mexico City-Felipe Ángeles International Airport (NLU/MMSM)
Investigating agency:	DAAIA Mexico
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
MasAir flight M73976, an Airbus A330-243(P2F), had taken off from runway 15 at Ted Stevens International Airport in Anchorage, Alaska, USA, when at 7,500 feet, the crew observed an ECAM indication "ELEC IDG No. 2 OVHT." They performed the procedure to disconnect the IDG from engine No. 2, and a few minutes later, the indication "ENGINE No. 2 FIRE" appeared, prompting the crew to decide to return to ANC. The 3 crew members were unharmed.

Probable Cause
"Returned to the station due to ECAM indication of low oil pressure (ELEC IDG LOW PRESSURE) and subsequent high temperature (ELEC IDG OVERHEAT) because the line maintenance personnel overfilled and recharged the IDG oil of engine number two, omitting the component replacement."

Contributing Factors
a) Lack of adherence to procedures and functions by the supervisor of the Maintenance Control Center (MCC) of the operator Aerotransportes Mas de Carga S. A. de C. V. in supporting, supervising, monitoring, tracking, and controlling tasks on the fleet's aircraft during their stay on the ground, AOG, and/or service.
b) Lack of support, assistance, and verification by the technical personnel of the line maintenance service provider from the MCC of the operator Aerotransportes Mas de Carga S.A. DE C.V. during the execution of maintenance tasks and oil refilling of the IDG of engine No. 2.
c) Lack of experience with A330 equipment by the technical personnel of the line maintenance service provider Pegasus Aviation Services LLC.

Accident investigation: