# Airworthiness directives: TCDS 4A21 A list on [TCDS 4A21](https://openairdocs.org/tcds/4A21.md). ADs whose products are models on this data sheet, matched by model and maker. Those in force first, newest first. Page 1 of 4 · 190 ADs - [AD 2026-13-02](https://openairdocs.org/ad/2026-13-02.md): Navigation · Effective Jul 1, 2026 - [AD 2026-13-15](https://openairdocs.org/ad/2026-13-15.md): Navigation · Effective Jul 1, 2026 - [AD 2023-12-15](https://openairdocs.org/ad/2023-12-15.md): Navigation · Effective Jun 21, 2023 · Supersedes AD 2022-09-18 - [AD 2023-10-02](https://openairdocs.org/ad/2023-10-02.md): Indicating/Recording System, Navigation · Effective May 26, 2023 · Supersedes AD 2021-23-12 - [AD 2022-25-01](https://openairdocs.org/ad/2022-25-01.md): Wings · Effective Feb 16, 2023 - [AD 2020-03-11](https://openairdocs.org/ad/2020-03-11.md): Fuel · Effective Mar 18, 2020 - [AD 2018-23-12](https://openairdocs.org/ad/2018-23-12.md): Equipment/furnishings · Effective Dec 28, 2018 - [AD 2018-19-32](https://openairdocs.org/ad/2018-19-32.md): Nacelles/pylons · Effective Nov 2, 2018 - [AD 2018-19-21](https://openairdocs.org/ad/2018-19-21.md): Fuel · Effective Nov 1, 2018 - [AD 2017-18-20](https://openairdocs.org/ad/2017-18-20.md): Doors · Effective Nov 9, 2017 - [AD 2017-09-04](https://openairdocs.org/ad/2017-09-04.md): Fuselage · Effective Jun 8, 2017 - [AD 2016-08-11](https://openairdocs.org/ad/2016-08-11.md): Stabilizers · Effective May 27, 2016 · Supersedes AD 2012-17-13 - [AD 2015-11-04](https://openairdocs.org/ad/2015-11-04.md): Nacelles/Pylons · Effective Jul 6, 2015 - [AD 2014-16-09](https://openairdocs.org/ad/2014-16-09.md): Oxygen · Effective Sep 23, 2014 - [AD 2014-13-11](https://openairdocs.org/ad/2014-13-11.md): Fuselage · Effective Aug 19, 2014 - [AD 2013-24-07](https://openairdocs.org/ad/2013-24-07.md): Fuel · Effective Jan 7, 2014 - [AD 2013-03-19](https://openairdocs.org/ad/2013-03-19.md): Electrical Power · Effective Mar 21, 2013 · Supersedes AD 2001-17-20 - [AD 2012-16-12](https://openairdocs.org/ad/2012-16-12.md): Nacelles/Pylons · Effective Sep 21, 2012 - [AD 2011-12-01](https://openairdocs.org/ad/2011-12-01.md): Equipment/Furnishings · Effective Aug 1, 2011 - [AD 2011-01-09](https://openairdocs.org/ad/2011-01-09.md): Oxygen · Effective Feb 9, 2011 - [AD 2009-21-10 R1](https://openairdocs.org/ad/2009-21-10-R1.md): Oxygen · Effective Feb 4, 2010 · Supersedes AD 2009-21-10 - [AD 2008-04-11 R1](https://openairdocs.org/ad/2008-04-11-R1.md): Fuel tank systems · Effective Jan 12, 2010 · Supersedes AD 2008-04-11 - [AD 2009-18-10](https://openairdocs.org/ad/2009-18-10.md): Wings · Effective Oct 14, 2009 · Supersedes AD 2008-17-10 - [AD 2009-15-06](https://openairdocs.org/ad/2009-15-06.md): Fuel System · Effective Aug 25, 2009 - [AD 2008-12-03](https://openairdocs.org/ad/2008-12-03.md): Auxiliary fuel tanks · Effective Jul 9, 2008 - [AD 2008-04-06](https://openairdocs.org/ad/2008-04-06.md): Left side and right side flight deck · Effective Mar 28, 2008 - [AD 2007-23-12](https://openairdocs.org/ad/2007-23-12.md): Fuel quantity indication system (FQIS) · Effective Dec 18, 2007 - [AD 2007-21-15](https://openairdocs.org/ad/2007-21-15.md): Elevator hinge support fittings · Effective Nov 20, 2007 - [AD 2006-26-13](https://openairdocs.org/ad/2006-26-13.md): Attachment of the shoulder restraint harness · Effective Feb 12, 2007 · Supersedes AD 2001-24-02, AD 2003-20-08 - [AD 2005-20-02](https://openairdocs.org/ad/2005-20-02.md): Airplane flight manual (AFM) · Effective Nov 1, 2005 - [AD 2005-08-15](https://openairdocs.org/ad/2005-08-15.md): Outboard engine nacelle · Effective May 31, 2005 · Supersedes AD 2001-17-24 - [AD 2005-04-01](https://openairdocs.org/ad/2005-04-01.md): Overwing Fuel Fill Ports · Effective Mar 23, 2005 - [AD 2004-25-09](https://openairdocs.org/ad/2004-25-09.md): Main landing gear (MLG) trunnion · Effective Jan 13, 2005 - [AD 2004-22-24](https://openairdocs.org/ad/2004-22-24.md): High frequency eddy current (HFEC) inspections for corrosion and cracking · Effective Dec 14, 2004 · Supersedes AD 2001-08-02 - [AD 2004-22-01](https://openairdocs.org/ad/2004-22-01.md): Cargo restraint strap assemblies · Effective Dec 1, 2004 - [AD 2004-20-02](https://openairdocs.org/ad/2004-20-02.md): Wing fillet flap support link · Effective Nov 4, 2004 - [AD 2004-07-06](https://openairdocs.org/ad/2004-07-06.md): Aft trunnion support fitting of each main landing gear · Effective May 11, 2004 - [AD 2004-05-14](https://openairdocs.org/ad/2004-05-14.md): Wing front spar upper chord · Effective Apr 14, 2004 - [AD 2003-03-15 R1](https://openairdocs.org/ad/2003-03-15-R1.md): Airplane Flight Manual (AFM) - oxygen masks · Effective Dec 22, 2003 · Supersedes AD 2003-03-15 - [AD 2002-22-12](https://openairdocs.org/ad/2002-22-12.md): Titeflex hoses · Effective Dec 13, 2002 - [AD 2002-02-02](https://openairdocs.org/ad/2002-02-02.md): Support Structure for the Main Landing Gear (MLG) Uplock Mechanism · Effective Mar 11, 2002 - [AD 2001-22-14](https://openairdocs.org/ad/2001-22-14.md): Fire Extinguishing System Bottle Cartridges · Effective Dec 10, 2001 - [AD 2001-03-13](https://openairdocs.org/ad/2001-03-13.md): Wing - Upper Skin Cracking · Effective Mar 22, 2001 - [AD 2000-24-06](https://openairdocs.org/ad/2000-24-06.md): Main Cargo Door Skin and Frame · Effective Jan 8, 2001 · Supersedes AD 83-02-09 - [AD 2000-24-20](https://openairdocs.org/ad/2000-24-20.md): Lower Skin Wings · Effective Jan 8, 2001 - [AD 99-23-22 R2](https://openairdocs.org/ad/99-23-22-R2.md): Transponders · Effective Apr 20, 2000 · Supersedes AD 99-23-22 R1 - [AD 99-04-10](https://openairdocs.org/ad/99-04-10.md): Fluorescent Light Ballasts · Effective Mar 18, 1999 - [AD 97-04-04](https://openairdocs.org/ad/97-04-04.md): Auxiliary Power Units · Effective Mar 24, 1997 - [AD 96-25-12](https://openairdocs.org/ad/96-25-12.md): Auxiliary Power Units · Effective Jan 13, 1997 - [AD 95-17-01](https://openairdocs.org/ad/95-17-01.md): Upper Center Section Cracks · Effective Sep 13, 1995 Next page: https://openairdocs.org/tcds/4A21/ads.md?page=2 ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```sql SELECT d.ad_number, d.status, d.subject, d.effective_date FROM 'https://openairdocs.org/data/latest/faa_directive.parquet' d WHERE d.ad_id IN (SELECT ad_id FROM 'https://openairdocs.org/data/latest/faa_directive_product.parquet' WHERE tcds_number = '4A21') ORDER BY d.status = 'Historical', coalesce(d.effective_date, d.publication_date) DESC ``` This list as a web page: https://openairdocs.org/tcds/4A21/ads --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.