GACA, SIIA sign deal to implement performance quality assessment services June 09, 2021 The General Court of Audit President and Chairman of the Board of Directors of the Saudi Institute of Internal Auditors Dr. Hussam Bin Abdulmohsen Al-Anqari and GACA President Abdulaziz Bin Abdullah Al-Duailej attended the signing ceremony. RIYADH — The General Authority of Civil Aviation (GACA) signed Wednesday a cooperation agreement with the Saudi Institute of Internal Auditors (SIIA) in the field of implementing quality performance evaluation services for GACA internal audit department, with the aim of activating aspects of partnership and cooperation between the two parties. The General Court of Audit President and Chairman of the Board of Directors of the Saudi Institute of Internal Auditors Dr. Hussam Bin Abdulmohsen Al-Anqari and GACA President Abdulaziz Bin Abdullah Al-Duailej attended the signing ceremony.