Monitoring the installation of Solar Systems on field along with checking equipment working and other operations.

Line Maintenance. 
Line Maintenance generally refers to minor, unscheduled or scheduled maintenance carried out on aircraft that includes:

Any unscheduled maintenance resulting from unforeseen events
Scheduled checks that contain servicing and/or inspections that do not require specialized training, equipment, or facilities.In service; and that is preparing for its first flight in service
Maintenance performed on aircraft after a period of being out of service (such as aircraft in storage)
Maintenance on en route aircraft that are stopped before their next flight including Servicing or repair between successive flights
Preparing and readying an aircraft for flight during a period of service
Maintenance activities being performed  to ensure that the aircraft is airworthy and fit for flight. 

Base Maintenance. 
The definition of base maintenance is simple – it is all maintenance which does not fall under the line maintenance category. In practice, this will be mainly heavy checks such as C and D checks. During those checks major and minor aircraft systems are being evaluated together with complex and time consuming tasks such as corrosion prevention, structural work, replacement of major components, interior refurbishment, etc. Of course, all this work needs to be done in a hangar and requires quite a bit of planning and a significant dose of cooperation between the airline and the MRO.
The arrangement of base maintenance is not as simple as with line maintenance. Operators are required (by law) to have base maintenance contracts in place for all aircraft they operate. Such contracts need to fulfill the Part 145 contracting / subcontracting requirements and need to be approved by the respective aviation authority.

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