# Airworthiness directives that may apply: N121PD

A list on [N121PD](https://openairdocs.org/aircraft/N121PD.md).

Matched by this aircraft’s airframe and engine models. Each AD’s applicability may narrow it by serial number, part number or equipment.

- [AD 2026-20-03](https://openairdocs.org/ad/2026-20-03.md): Placards and Markings · Effective Nov 5, 2026
- [AD 2026-14-02](https://openairdocs.org/ad/2026-14-02.md): Indication/Recording System · Effective Aug 14, 2026
- [AD 2026-04-07](https://openairdocs.org/ad/2026-04-07.md): Rotorcraft Flight Control · Effective Apr 7, 2026
- [AD 2025-20-10](https://openairdocs.org/ad/2025-20-10.md): Tail Rotor System · Effective Dec 30, 2025 · Supersedes AD 2021-26-07
- [AD 2025-17-02](https://openairdocs.org/ad/2025-17-02.md): Emergency Flotation Section · Effective Sep 26, 2025
- [AD 2025-05-12](https://openairdocs.org/ad/2025-05-12.md): Main Rotor Head · Effective May 8, 2025 · Supersedes AD 2008-10-01, AD 2010-05-51
- [AD 2024-20-07](https://openairdocs.org/ad/2024-20-07.md): Emergency Equipment; Emergency Flotation Section · Effective Dec 5, 2024
- [AD 2023-14-06](https://openairdocs.org/ad/2023-14-06.md): Main Landing Gear Strut, Axle, Truck · Effective Sep 8, 2023
- [AD 2023-11-07](https://openairdocs.org/ad/2023-11-07.md): Ground Proximity System · Effective Jun 22, 2023 · Supersedes AD 2021-23-13
- [AD 2022-02-13](https://openairdocs.org/ad/2022-02-13.md): Rotorcraft Tail Boom · Effective Mar 17, 2022
- [AD 2022-02-06](https://openairdocs.org/ad/2022-02-06.md): Tail Rotor Blades · Effective Mar 17, 2022
- [AD 2021-24-08](https://openairdocs.org/ad/2021-24-08.md): Main Rotor System · Effective Jan 14, 2022 · Supersedes AD 2021-04-21
- [AD 2021-17-17](https://openairdocs.org/ad/2021-17-17.md): Cabin Equipment/Furnishings · Effective Nov 22, 2021
- [AD 2020-25-11](https://openairdocs.org/ad/2020-25-11.md): Doors · Effective Jan 21, 2021 · Supersedes AD 2014-12-12
- [AD 2020-12-02](https://openairdocs.org/ad/2020-12-02.md): Tail rotor blades · Effective Jul 13, 2020
- [AD 2017-26-04](https://openairdocs.org/ad/2017-26-04.md): Emergency Equipment · Effective Jan 24, 2018 · Supersedes AD 2009-25-07
- [AD 2017-06-11](https://openairdocs.org/ad/2017-06-11.md): failure of an air conditioner compressor drive pulley (pulley) or tail rotor output wheel (wheel) · Effective May 8, 2017 · Supersedes AD 2015-24-51
- [AD 2016-12-13](https://openairdocs.org/ad/2016-12-13.md): Engine/Transmission Coupling--Coupling Tube, Engine Mount, and Engine Mount Base · Effective Jul 27, 2016 · Supersedes AD 2000-05-17, AD 2001-04-12
- [AD 2015-26-04](https://openairdocs.org/ad/2015-26-04.md): Cabin Equipment/Furnishings · Effective Feb 4, 2016 · Supersedes AD 2002-13-11
- [AD 2013-16-19](https://openairdocs.org/ad/2013-16-19.md): Emergency Flotation Section · Effective Sep 27, 2013
- [AD 2011-21-18](https://openairdocs.org/ad/2011-21-18.md): Cyclic Control Stick · Effective Dec 20, 2011
- [AD 2011-11-04](https://openairdocs.org/ad/2011-11-04.md): Contaminated Gas · Effective Jun 17, 2011
- [AD 2005-09-05](https://openairdocs.org/ad/2005-09-05.md): Tail rotor drive shaft (drive shaft) · Effective Jun 13, 2005
- [AD 2003-22-10](https://openairdocs.org/ad/2003-22-10.md): Electrical bonding braid (bonding braid) that is installed on the left cyclic pitch control stick base · Effective Dec 10, 2003
- [AD 2003-08-04](https://openairdocs.org/ad/2003-08-04.md): Cyclic pitch flight control torque tube · Effective May 22, 2003
- [AD 2002-15-08](https://openairdocs.org/ad/2002-15-08.md): Cargo Hooks · Effective Sep 6, 2002
- [AD 2001-24-08](https://openairdocs.org/ad/2001-24-08.md): Cabin Sliding Door Rail · Effective Jan 7, 2002 · Supersedes AD 2000-17-07
- [AD 2026-08-12](https://openairdocs.org/ad/2026-08-12.md): Engine Fuel Pump · Effective Jun 2, 2026
- [AD 2024-24-02](https://openairdocs.org/ad/2024-24-02.md): Engine Fuel Pump · Effective Dec 10, 2024
- [AD 2018-12-03](https://openairdocs.org/ad/2018-12-03.md): Fuel Controlling System · Effective Aug 9, 2018 · Supersedes AD 2013-11-09
- [AD 2018-05-03](https://openairdocs.org/ad/2018-05-03.md): Engine Oil System (Airframe Furnished) · Effective Mar 21, 2018
- [AD 2015-17-18](https://openairdocs.org/ad/2015-17-18.md): Oil pump · Effective Oct 2, 2015
- [AD 2015-10-07](https://openairdocs.org/ad/2015-10-07.md): Ejector assembly nozzle · Effective Jun 12, 2015 · Supersedes AD 2014-01-01
- [AD 2012-07-09](https://openairdocs.org/ad/2012-07-09.md): P3 air pipe (first section) and the RH rear half-wall · Effective May 24, 2012 · Supersedes AD 2009-14-11
- [AD 2009-14-01](https://openairdocs.org/ad/2009-14-01.md): Check valve piston · Effective Aug 3, 2009 · Supersedes AD 2005-17-17 R1
- [AD 2008-13-27](https://openairdocs.org/ad/2008-13-27.md): Propeller · Effective Aug 6, 2008
- [AD 2007-11-06](https://openairdocs.org/ad/2007-11-06.md): Constant delta pressure (delta P) diaphragm · Effective Jun 26, 2007 · Supersedes AD 2005-19-10
- [AD 2005-17-15](https://openairdocs.org/ad/2005-17-15.md): Fuel filter-holder assembly · Effective Sep 12, 2005
- [AD 2005-09-51](https://openairdocs.org/ad/2005-09-51.md): Module 2 · Emergency AD · Effective Jun 3, 2005
- [AD 2003-11-10](https://openairdocs.org/ad/2003-11-10.md): Fuel Flow Mechanical Stop Position · Effective Jul 3, 2003
- [AD 2021-26-07](https://openairdocs.org/ad/2021-26-07.md): Tail rotor system · Historical · Effective Jan 27, 2022 · Replaced by AD 2025-20-10
- [AD 2021-23-13](https://openairdocs.org/ad/2021-23-13.md): Ground Proximity System · Historical · Effective Dec 9, 2021 · Replaced by AD 2023-11-07
- [AD 2021-04-21](https://openairdocs.org/ad/2021-04-21.md): Main Rotor System · Historical · Effective May 7, 2021 · Replaced by AD 2021-24-08
- [AD 2020-11-05](https://openairdocs.org/ad/2020-11-05.md): Tail rotor system · Historical · Effective Jun 8, 2020 · Replaced by AD 2021-26-07
- [AD 2015-24-51](https://openairdocs.org/ad/2015-24-51.md): Air Comm Corporation (Air Comm) air conditioning kit · Historical · Replaced by AD 2017-06-11
- [AD 2014-12-12](https://openairdocs.org/ad/2014-12-12.md): Emergency Exits · Historical · Effective Aug 4, 2014 · Replaced by AD 2020-25-11
- [AD 2010-05-51](https://openairdocs.org/ad/2010-05-51.md): Main rotor hub · Historical · Effective May 14, 2010 · Replaced by AD 2025-05-12
- [AD 2009-25-07](https://openairdocs.org/ad/2009-25-07.md): Emergency Floatation Gear Lighting and Ancillary Control Unit (LACU) · Historical · Effective Dec 28, 2009 · Replaced by AD 2017-26-04
- [AD 2008-10-01](https://openairdocs.org/ad/2008-10-01.md): Spherical thrust bearings · Historical · Effective May 21, 2008 · Replaced by AD 2025-05-12
- [AD 2002-13-11](https://openairdocs.org/ad/2002-13-11.md): Yaw control · Historical · Effective Aug 13, 2002 · Replaced by AD 2015-26-04
- [AD 2001-04-12](https://openairdocs.org/ad/2001-04-12.md): Main Gearbox Coupling Tube Assembly · Historical · Effective Mar 20, 2001 · Replaced by AD 2016-12-13
- [AD 2000-17-07](https://openairdocs.org/ad/2000-17-07.md): Cabin Sliding Door · Historical · Effective Sep 12, 2000 · Replaced by AD 2001-24-08
- [AD 2000-05-17](https://openairdocs.org/ad/2000-05-17.md): Engine Coupling Tube · Historical · Effective Mar 27, 2000 · Replaced by AD 2016-12-13
- [AD 99-19-23](https://openairdocs.org/ad/99-19-23.md): Engine Coupling Tube Inspection · Historical · Effective Oct 19, 1999 · Replaced by AD 2000-05-17
- [AD 2014-01-01](https://openairdocs.org/ad/2014-01-01.md): Ejector assembly nozzle · Historical · Effective Feb 6, 2014 · Replaced by AD 2015-10-07
- [AD 2013-11-09](https://openairdocs.org/ad/2013-11-09.md): Fuel injection manifolds and the privilege injector · Historical · Effective Jul 5, 2013 · Replaced by AD 2018-12-03
- [AD 2009-14-11](https://openairdocs.org/ad/2009-14-11.md): P3 air pipe · Historical · Effective Aug 19, 2009 · Replaced by AD 2012-07-09
- [AD 2005-17-17 R1](https://openairdocs.org/ad/2005-17-17-R1.md): O-rings on the check valve piston · Historical · Effective Mar 21, 2007 · Replaced by AD 2009-14-01
- [AD 2001-08-14 R1](https://openairdocs.org/ad/2001-08-14-R1.md): Right injector half manifold and left injector half manifold · Historical · Effective Feb 23, 2006 · Replaced by AD 2013-11-09
- [AD 2005-19-10](https://openairdocs.org/ad/2005-19-10.md): Fuel control units (FCUs) · Historical · Effective Oct 3, 2005 · Replaced by AD 2007-11-06
- [AD 2005-17-17](https://openairdocs.org/ad/2005-17-17.md): Check valve piston in the lubrication unit · Historical · Effective Sep 12, 2005 · Replaced by AD 2005-17-17 R1
- [AD 2001-08-14](https://openairdocs.org/ad/2001-08-14.md): Fuel Injector Manifold · Historical · Effective May 31, 2001 · Replaced by AD 2001-08-14 R1

## 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, m.matched_by
FROM (
  SELECT ad_id, min(rank) AS rank, arg_min(matched_by, rank) AS matched_by
  FROM (SELECT ad_id, 1 AS rank, 'airframe' AS matched_by FROM 'https://openairdocs.org/data/latest/faa_aircraft_model_directive.parquet' WHERE aircraft_model_code = '8680987'
    UNION ALL SELECT ad_id, 2, 'engine' FROM 'https://openairdocs.org/data/latest/faa_engine_model_directive.parquet' WHERE engine_model_code = '60010')
  GROUP BY ad_id
) m JOIN 'https://openairdocs.org/data/latest/faa_directive.parquet' d USING (ad_id)
ORDER BY d.status = 'Historical', m.rank, coalesce(d.effective_date, d.publication_date, d.issue_date) DESC, d.ad_number DESC
```

This list as a web page: https://openairdocs.org/aircraft/N121PD/ads

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