# Airworthiness directives that may apply: N237CH

A list on [N237CH](https://openairdocs.org/aircraft/N237CH.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 2025-07-01](https://openairdocs.org/ad/2025-07-01.md): Air Data Computer · Effective May 15, 2025
- [AD 2024-20-05](https://openairdocs.org/ad/2024-20-05.md): Flight control systems · Effective Oct 28, 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 2021-23-06](https://openairdocs.org/ad/2021-23-06.md): Rotor flight controls · Effective Jan 4, 2022
- [AD 2018-16-11](https://openairdocs.org/ad/2018-16-11.md): Main Rotor Head · Effective Sep 17, 2018
- [AD 2014-13-04](https://openairdocs.org/ad/2014-13-04.md): Nacelle/Pylon Structure and Main Rotor Blades · Effective Jul 15, 2014
- [AD 2004-06-51](https://openairdocs.org/ad/2004-06-51.md): Upper shaft extension · Emergency AD · Effective Jun 18, 2004
- [AD 2002-15-02](https://openairdocs.org/ad/2002-15-02.md): Compressor Wheels · Effective Aug 28, 2002
- [AD 95-22-09](https://openairdocs.org/ad/95-22-09.md): Spiral Bevel Ring Gear Bolted Connection · Effective Dec 6, 1995
- [AD 91-03-01](https://openairdocs.org/ad/91-03-01.md): Rotor Blade Rod Ends · Effective Feb 14, 1991
- [AD 87-25-05](https://openairdocs.org/ad/87-25-05.md): Landing Gear Spindle · Effective Dec 15, 1987
- [AD 86-23-51](https://openairdocs.org/ad/86-23-51.md): Transmissions · Effective Jul 20, 1987
- [AD 84-10-51 R1](https://openairdocs.org/ad/84-10-51-R1.md): Forward Rotor Drive Shaft · Effective Jul 24, 1986
- [AD 85-23-51 R1](https://openairdocs.org/ad/85-23-51-R1.md): Main Rotor Head Vertical Hinge Pins Inspection · Effective Mar 31, 1986
- [AD 84-15-03](https://openairdocs.org/ad/84-15-03.md): Cylinders -Flight Control System · Effective Aug 3, 1984
- [AD 83-18-51 R2](https://openairdocs.org/ad/83-18-51-R2.md): Pitch Shafts · Effective May 31, 1984
- [AD 84-03-51](https://openairdocs.org/ad/84-03-51.md): Forward Main Rotor Tie Bars · Effective Mar 14, 1984
- [AD 83-16-51](https://openairdocs.org/ad/83-16-51.md): Main Rotor Blade Tip Cap · Effective Oct 26, 1983
- [AD 82-20-52](https://openairdocs.org/ad/82-20-52.md): Transmission · Effective Apr 4, 1983
- [AD 82-20-06 R1](https://openairdocs.org/ad/82-20-06-R1.md): Main Rotor Hubs Inspection · Effective Oct 15, 1982
- [AD T83-25-51 R1](https://openairdocs.org/ad/T83-25-51-R1.md): Rotor Head Horizontal Hinge Pins
- [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

## 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 = '1385051'
    UNION ALL SELECT ad_id, 2, 'engine' FROM 'https://openairdocs.org/data/latest/faa_engine_model_directive.parquet' WHERE engine_model_code = '33903')
  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/N237CH/ads

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