# Search: 18S

Advisory circulars: 61 matches in release 2026-11-03. Page 1.

- [AC 20-183](https://openairdocs.org/ac/20-183.md): Laser Airworthiness Installation Guidance · Approved Dec 15, 2014
- [AC 20-189](https://openairdocs.org/ac/20-189.md): Management of Open Problem  Reports (OPRs) · Approved Sep 16, 2022
- [AC 25-18](https://openairdocs.org/ac/25-18.md): Transport Category Airplanes Modified for Cargo Service · Approved Jan 6, 1994
- [AC 20-182A](https://openairdocs.org/ac/20-182.md): Airworthiness Approval for Aircraft Weather Radar Systems · Approved Oct 1, 2016
- [AC 20-180](https://openairdocs.org/ac/20-180.md): Approved Model List Supplemental Type Certificate (AML-STC) · Approved Aug 16, 2013
- [AC 43-18 CHG 2](https://openairdocs.org/ac/43-18.md): Fabrication of Aircraft Parts by Maintenance Personnel · Approved Jun 7, 2011
- [AC 20-181](https://openairdocs.org/ac/20-181.md): AIRWORTHINESS APPROVAL OF ATTITUDE HEADING REFERENCE SYSTEM (AHRS) EQUIPMENT · Approved Apr 7, 2014
- [AC 20-18B](https://openairdocs.org/ac/20-18.md): Qualification Testing of Turbojet and Turbofan Engine Thrust Reversers · Approved Jul 7, 2015
- [AC 20-188](https://openairdocs.org/ac/20-188.md): Compatibility of Changes to Type Design Installed on Aircraft · Approved Dec 9, 2016
- [AC 20-186A](https://openairdocs.org/ac/20-186.md): Airworthiness and Operational Approval of Cockpit Voice Recorder Systems · Approved May 6, 2024
- [AC 187-1V](https://openairdocs.org/ac/187-1.md): Flight Standards Service Schedule of Charges Outside the United States · Approved Sep 29, 2026
- [AC 23-18](https://openairdocs.org/ac/23-18.md): Installation of Terrain Awareness and Warning System (TAWS) Approved for Part 23 Airplanes · Approved Jun 14, 2000
- [AC 187-2](https://openairdocs.org/ac/187-2.md): Aircraft Certification Service Fees for Providing Production Certification-Related Services Outside the United States · Approved Mar 11, 1998
- [AC 20-184A](https://openairdocs.org/ac/20-184.md): Guidance on Testing and Installation of Rechargeable Lithium Battery and Battery Systems on Aircraft · Approved Sep 18, 2026
- [AC 20-185A](https://openairdocs.org/ac/20-185.md): Airworthiness Approval of Synthetic Vision Systems, Synthetic Vision Guidance Systems and Aircraft State Awareness Synthetic Vision Systems · Approved Jan 27, 2021
- [AC 145-2](https://openairdocs.org/ac/145-2.md): Repair Station Limited Ratings Beech 18 Series Aircraft · Approved Apr 21, 1976
- [AC 39-1B](https://openairdocs.org/ac/39-1.md): Jig Fixtures; Replacement of Wing Attach Angles and Doublers on The Boeing Company DC-3 Series Aircraft, Airworthiness Directive 66-18-02 · Approved Sep 24, 2026
- [AC 183-35J](https://openairdocs.org/ac/183-35J.md): Airworthiness Designee Information · Approved Jun 2, 2003 · superseded or historical
- [AC 183-35K](https://openairdocs.org/ac/183-35.md): Airworthiness Designee Information · Approved Jan 6, 2004 · superseded or historical
- [AC 21-18](https://openairdocs.org/ac/21-18.md): [Large AC] Bilateral Airworthiness Agreements · Approved Aug 20, 1982 · superseded or historical

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