Sament Group completed the implementation of a natural roof lighting and smoke extraction system on the fourth Lufthansa Technik Airplane Refurbishment hangar at Sofia Airport at the end of September 2017. While simultaneously,a system for facade natural lighting on a repair center for aircraft nose parts was also completed.

Completed installation activities include:
- GLOS DL BT system for natural roof lighting
- GLOS FF EL BLOCK 10 system
- Smoke curtains type NYMBUS SC
- GLOS DL V system
- AUTOMATION LINE management and control system

This is the fourth hangar for Lufthansa Technik at Sofia Airport. The reconstruction of the first hangar and the construction of a new second hangar were completed in 2011. A new third hangar with adjoining office buildings was completed in 2012.
Sament Group was committed to and fulfilled all elements for natural roof lighting and smoke evacuation systems of hangars 1, 2 and 3.

 The following systems were embedded:
- GLOS DL BT
- GLOS S30S
- GLOS S30S FIX
- GLOS IA
- NYMBUS SC
- AUTOMATION LINE
- ARCHITECTURAL LINE through window and door automation.

Installed systems for all four hangars included:
Systems for natural roof lighting - 1 944 m2.
Systems for natural facade lighting - 40 m2.
Natural smoke and heat extraction ventilators/NSHEVs/ -  52 units.
Smoke barriers: 1394 m2.
Window and doors automation for inlets - 42 units
Management and control systems - 36 units.