• MC 04-18 Amendment to Philippine Civil Aviation Regulations - Air Navigation Services (CAR-ANS) Part 6 Incorporating Amendment 88B to ICAO Annex 10 Volume 1
• MC 05-18 Amendment to Philippine Civil Aviation Regulations - Air Navigation Services (CAR-ANS) Part 6 Incorporating Amendment 89 to ICAO Annex 10 Volume 1
• MC 06-18 Amendment to Philippine Civil Aviation Regulations - Air Navigation Services (CAR-ANS) Part 6 Incorporating Amendment 90 to ICAO Annex 10 Volume 1
• MC 07-18 ANF Certification Process
• MC 12-18 Amendment to PCAR Part 7 in Compliance with ICAO Annex 6 Part 11
• MC 13-18 Amendment to the Philippine Civil Aviation Regulations Part 6; 6.2.1.3 Duration and Renewal of Certificate
• MC 14-18 Revision to MC 003-17 dated March 7, 2017 re Clarification on the Procedures and Documentary Requirement in Proficiency Checks Conducted by Designated Check Airman (DCA)
• MC 15-18 Birdstrike Reporting Form
• MC 16-18 Amendment to PCAR Parts 2, 3 and 8 Regarding Upset Prevention and Recovery Training UPRT
• MC 17-18 Amendment To Philippine Civil Aviation Regulations - Air Navigation Services (CAR-ANS) Part 7 Incorporating Amendment 90 to ICAO Annex 10 Volome III Part I
• MC 18-18 Amendment To Philippine Civil Aviation Regulations - Air Navigation Services (CAR-ANS) Part 8 Incorporating Amendment 90 to ICAO Annex 10 Volome III Part II
• MC 23-18 Registration of ELT
• MC 24-18 Development and Implementation of Programs Focusing on Adverse Weather Condition
• MC 25-18 Addendum to Memorandum Circular No. 005-17 for the Adoption of Corrigendum No. 1 to Annex 3 Amendment 77
• MC 26-18 Amendments to the Philippine Civil Aviation Regulations Part 9 (Air Operator Certification and Administration)
• MC 27-18 Amendment to PCAR Part 8.2.2 [AOC] Aircraft Tracking in Compliance with ICAO Annex 6 Part I
• MC 28-18 General Operating Instructions for R-985 Engines, Visual Inspections and VFR Only Operations
• MC 29-18 Amendment to Philippine Civil Aviation Regulations - Air Navigation Services (CAR-ANS) Part 4 Incorporating Amendment 60 to ICAO Annex 4 and Other Supplementary Amendments
• MC 31-18 Amendment to PCAR Part 13 in Compliance with Amendment 16 to ICAO Annex 13
• MC 32-18 Implementation of ICAO SARPS, Annex 16, Volume 4 on Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA)
• MC 33-18 Amendment to Philippine Civil Aviation Regulations - Air Navigation Services (CAR-ANS) Part 3 Incorporating Amendment 78 to ICAO Annex 3 and Other Supplementary Amendments
• MC 34-18 Amendment to Philippine Civil Aviation Regulations - Air Navigation Services (CAR-ANS) Part 9 Incorporating Amendment 90 to ICAO Annex 10 Vol IV (Surveillance and Collision Avoidance Systems)
• MC 35-18 Amendments to the Philippine Civil Aviation Regulations (Re: Extending the Validity Period of Various Certificates)
• MC 36-18 Amendment to PCAR Part 8.2.2 [AOC] Aircraft Tracking in Compliance with Amendment 42 of ICAO Annex 6 Part I