The Grand Mosque in Makkah" maintenance is characterized under the supervision of more than 800 engineers, technicians and workers. The Grand Mosque receives high attention, constant care, continuous work round the clock, distinguished efforts and high-quality services that are provided by the Presidency General of the Affairs of the Two Holy Mosques to its visitors and to its Umrah performers and pilgrims. These efforts reflect the wise leadership"s interest, where the presidency"s agency for technical, operational and maintenance affairs and the administration of facilities work on following up on the operation and maintenance of electronic, electric and mechanical systems at the Grand Mosque. The efforts also included its facilities through providing a field engineering work team round the clock supported by technical and administrative personnel to ensure implementing the work with high quality and perfect performance, under the follow up of the undersecretary general for technical, operational and maintenance affairs and facility administration Eng. Sultan Al-Qurashi. The general administration for operation and maintenance seeks to cover all maintenance works at the Grand Holy Mosque through setting plans and studies and implementing works on the ground, achieving the highest degrees of excellence and accuracy thanks to being supported by human personnel with the highest levels of professionalism. These human personnel include 205 engineers, 450 technicians and 200 workers who inspect 8,000 speakers, 120,000 lighting units, 4,000 electric panels, 20 power generators, and 6,350 fans. Other tasks include supervising 202 elevators, 16 escalators, 1,000 fire extinguisher boxes, checking on water reservoirs with a capacity of 1,500 cubic meters, 5,000 bathrooms, 4,000 cooling devices and sterilizers and coolers for Zamzam water. The general administration for operation and maintenance implements maintenance works for the power generators, invertors, control panels, load panels, lighting units and other systems round the clock under the supervision of a specialized field work team. The civil work administration at the general administration enjoys a monitoring role on the building of the Grand Holy Mosque, yards and other surroundings, in addition to the external facilities. - SPA