# Airworthiness directives that may apply: N901HC

A list on [N901HC](https://openairdocs.org/aircraft/N901HC.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 2026-17-07](https://openairdocs.org/ad/2026-17-07.md): Main rotor mast/swashplate · Effective Oct 2, 2026
- [AD 2025-17-10](https://openairdocs.org/ad/2025-17-10.md): Main Rotor Control · Effective Sep 9, 2025
- [AD 2025-07-01](https://openairdocs.org/ad/2025-07-01.md): Air Data Computer · Effective May 15, 2025
- [AD 2025-03-03](https://openairdocs.org/ad/2025-03-03.md): Cabin Equipment/Furnishings · Effective Feb 19, 2025
- [AD 2024-15-11](https://openairdocs.org/ad/2024-15-11.md): Tail Rotor System · Effective Oct 21, 2024
- [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 2023-01-02](https://openairdocs.org/ad/2023-01-02.md): Emergency Equipment · Effective Feb 17, 2023
- [AD 2022-07-11](https://openairdocs.org/ad/2022-07-11.md): Tail Rotor System · Effective May 5, 2022 · Supersedes AD 2021-17-18
- [AD 2022-05-10](https://openairdocs.org/ad/2022-05-10.md): Cabin Equipment/Furnishings · Effective Apr 20, 2022
- [AD 2021-21-03](https://openairdocs.org/ad/2021-21-03.md): Rotorcraft Flight Control, Rotorcraft Servo System · Effective Dec 10, 2021
- [AD 2021-17-10](https://openairdocs.org/ad/2021-17-10.md): Main Rotor Brake · Effective Sep 7, 2021
- [AD 2021-07-05](https://openairdocs.org/ad/2021-07-05.md): Main Rotor Blades · Effective Apr 8, 2021 · Supersedes AD 2007-26-52
- [AD 2020-15-16](https://openairdocs.org/ad/2020-15-16.md): Tail Rotor Drive System · Effective Aug 27, 2020 · Supersedes AD 2018-07-08
- [AD 2018-06-51](https://openairdocs.org/ad/2018-06-51.md): Main Rotor Mast/Swashplate · Emergency AD · Effective Jun 7, 2018
- [AD 2016-18-18](https://openairdocs.org/ad/2016-18-18.md): Tail Rotor Drive Shaft · Effective Oct 20, 2016
- [AD 2015-11-08](https://openairdocs.org/ad/2015-11-08.md): Tail Rotor System · Effective Jun 24, 2015 · Supersedes AD 2014-02-08
- [AD 2015-05-52](https://openairdocs.org/ad/2015-05-52.md): Tail Rotor Controls · Emergency AD · Effective Apr 29, 2015
- [AD 2014-23-02](https://openairdocs.org/ad/2014-23-02.md): Main Rotor Gearbox · Effective Dec 26, 2014
- [AD 2014-11-07](https://openairdocs.org/ad/2014-11-07.md): Main Rotor System · Effective Jun 18, 2014
- [AD 2014-09-01](https://openairdocs.org/ad/2014-09-01.md): Tail Rotor · Effective Jun 5, 2014
- [AD 2013-20-51](https://openairdocs.org/ad/2013-20-51.md): Tail rotor system · Emergency AD · Effective Oct 25, 2013
- [AD 2013-06-51](https://openairdocs.org/ad/2013-06-51.md): Equipment/Furnishings · Emergency AD · Effective Jul 15, 2013
- [AD 2013-05-22](https://openairdocs.org/ad/2013-05-22.md): Tail rotor pitch control link assembly · Effective Apr 30, 2013
- [AD 2011-17-01](https://openairdocs.org/ad/2011-17-01.md): Main rotor scissor fitting assembly · Effective Sep 12, 2011 · Supersedes AD 2010-02-51
- [AD 2004-15-21](https://openairdocs.org/ad/2004-15-21.md): Tail rotor trunnion (trunnion) assembly · Effective Aug 17, 2004
- [AD 2003-12-13](https://openairdocs.org/ad/2003-12-13.md): Tail rotor blade (blade) · Effective Jul 11, 2003
- [AD 2002-20-05](https://openairdocs.org/ad/2002-20-05.md): Rescue hoists · Effective Nov 7, 2002
- [AD 2000-20-06](https://openairdocs.org/ad/2000-20-06.md): Aft Support Fitting · Effective Oct 17, 2000
- [AD 2000-08-05](https://openairdocs.org/ad/2000-08-05.md): Main Rotor Pitch Control Link Assembly · Effective May 30, 2000 · Supersedes AD 99-02-09
- [AD 99-04-20](https://openairdocs.org/ad/99-04-20.md): Breeze-Eastern Rescue Hoist Cable · Effective Mar 4, 1999
- [AD 98-13-28](https://openairdocs.org/ad/98-13-28.md): Tail Rotor Blade Inspection · Effective Jul 13, 1998
- [AD 97-26-09](https://openairdocs.org/ad/97-26-09.md): Inspect Gleason Crown For Cracks · Effective Jan 2, 1998
- [AD 78-24-02](https://openairdocs.org/ad/78-24-02.md): Main Transmission · Effective Nov 24, 1978
- [AD 2023-13-14](https://openairdocs.org/ad/2023-13-14.md): Engine · Effective Jul 25, 2023
- [AD 2017-15-07](https://openairdocs.org/ad/2017-15-07.md): Fuel Control/Turbine Engines · Effective Aug 8, 2017 · Supersedes AD 2017-04-51
- [AD 2016-22-10](https://openairdocs.org/ad/2016-22-10.md): Centrifugal impeller · Effective Dec 6, 2016
- [AD 2015-13-04](https://openairdocs.org/ad/2015-13-04.md): Engine accessory gearbox (AGB) · Effective Sep 1, 2015 · Supersedes AD 2014-19-05
- [AD 2013-24-05](https://openairdocs.org/ad/2013-24-05.md): Free turbine module · Effective Jan 28, 2014
- [AD 2013-08-22](https://openairdocs.org/ad/2013-08-22.md): Tachometer's unit cycle-counting feature · Effective May 28, 2013
- [AD 2012-27-02](https://openairdocs.org/ad/2012-27-02.md): High gas generator speed (NG) rating vibration check · Effective Feb 14, 2013
- [AD 2012-24-03](https://openairdocs.org/ad/2012-24-03.md): Gas generator rotating assembly · Effective Jan 7, 2013 · Supersedes AD 2003-12-14
- [AD 2009-26-07](https://openairdocs.org/ad/2009-26-07.md): Reduction gearboxes (module M05) · Effective Jan 12, 2010 · Supersedes AD 2009-12-51
- [AD 2007-02-17](https://openairdocs.org/ad/2007-02-17.md): Fuel leak at the level of start electro valve · Effective Mar 2, 2007
- [AD 2003-16-03](https://openairdocs.org/ad/2003-16-03.md): Second Stage Turbine Disk · Effective Sep 12, 2003 · Supersedes AD 95-11-01
- [AD 2003-03-12](https://openairdocs.org/ad/2003-03-12.md): Bleed Valve · Effective Mar 7, 2003
- [AD 2000-20-01](https://openairdocs.org/ad/2000-20-01.md): Rear Bearing Oil Return System · Effective Oct 17, 2000
- [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 2021-17-18](https://openairdocs.org/ad/2021-17-18.md): Tail Rotor System · Historical · Effective Sep 7, 2021 · Replaced by AD 2022-07-11
- [AD 2018-07-08](https://openairdocs.org/ad/2018-07-08.md): Tail Rotor Drive System · Historical · Effective Apr 26, 2018 · Replaced by AD 2020-15-16
- [AD 2014-02-08](https://openairdocs.org/ad/2014-02-08.md): Tail Rotor System · Historical · Effective Mar 7, 2014 · Replaced by AD 2015-11-08
- [AD 2010-02-51](https://openairdocs.org/ad/2010-02-51.md): Main rotor scissor fitting assembly fixing bolt · Historical · Replaced by AD 2011-17-01
- [AD 2007-26-52](https://openairdocs.org/ad/2007-26-52.md): Main rotor blade (MRB) · Historical · Effective May 27, 2008 · Replaced by AD 2021-07-05
- [AD 2001-24-07 R1](https://openairdocs.org/ad/2001-24-07-R1.md): Main Rotor Blade Tip Cap · Historical · Effective Jul 30, 2004 · Replaced by AD 2007-26-52
- [AD 2001-24-07](https://openairdocs.org/ad/2001-24-07.md): Blade Tip Cap · Historical · Effective Jan 7, 2002 · Replaced by AD 2001-24-07 R1
- [AD 98-19-04](https://openairdocs.org/ad/98-19-04.md): Main Rotor Blade Tip Cap · Historical · Effective Mar 3, 1999 · Replaced by AD 2001-24-07
- [AD 99-02-09](https://openairdocs.org/ad/99-02-09.md): Pitch Change Link Assembly · Historical · Effective Feb 19, 1999 · Replaced by AD 2000-08-05
- [AD 2017-04-51](https://openairdocs.org/ad/2017-04-51.md): Fuel Control/ Turbine Engines · Historical · Effective Mar 30, 2017 · Replaced by AD 2017-15-07
- [AD 2014-19-05](https://openairdocs.org/ad/2014-19-05.md): Engine accessory gearbox (AGB) · Historical · Effective Nov 5, 2014 · Replaced by AD 2015-13-04
- [AD 2009-12-51](https://openairdocs.org/ad/2009-12-51.md): Gearboxes (module M05) · Historical · Effective Jul 15, 2009 · Replaced by AD 2009-26-07
- [AD 2003-12-14](https://openairdocs.org/ad/2003-12-14.md): Axial Compressor · Historical · Effective Jul 25, 2003 · Replaced by AD 2012-24-03

## 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 = '0260502'
    UNION ALL SELECT ad_id, 2, 'engine' FROM 'https://openairdocs.org/data/latest/faa_engine_model_directive.parquet' WHERE engine_model_code = '60033')
  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/N901HC/ads

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