# Airworthiness directives that may apply: N506

A list on [N506](https://openairdocs.org/aircraft/N506.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 2023-11-07](https://openairdocs.org/ad/2023-11-07.md): Ground Proximity System · Effective Jun 22, 2023 · Supersedes AD 2021-23-13
- [AD 95-26-08](https://openairdocs.org/ad/95-26-08.md): Main Rotor Shaft · Effective Jan 4, 1996
- [AD 95-10-09](https://openairdocs.org/ad/95-10-09.md): Transmission Main Gear Box Ring Gear · Effective Jun 16, 1995
- [AD 89-25-01](https://openairdocs.org/ad/89-25-01.md): Engine Fire Extinguishing System · Effective Dec 26, 1989
- [AD 60-17-03 R1](https://openairdocs.org/ad/60-17-03-R1.md): Main Rotor Blade Assemblies · Effective Feb 2, 1989
- [AD 64-02-06 R1](https://openairdocs.org/ad/64-02-06-R1.md): Pylon and Tail Cone Fittings · Effective Dec 27, 1988
- [AD 86-25-05](https://openairdocs.org/ad/86-25-05.md): Gearbox Pinions Or Gears · Effective Jan 5, 1987
- [AD 85-17-08](https://openairdocs.org/ad/85-17-08.md): Main Rotor Head Bolts · Effective Jan 13, 1986
- [AD 82-01-07](https://openairdocs.org/ad/82-01-07.md): Horizontal Hinge Pins · Effective Feb 1, 1982
- [AD 74-15-06](https://openairdocs.org/ad/74-15-06.md): Tail Rotor Gear Box · Effective Dec 30, 1977
- [AD 75-13-01](https://openairdocs.org/ad/75-13-01.md): Main Rotor Assembly · Effective May 20, 1977
- [AD 75-07-08](https://openairdocs.org/ad/75-07-08.md): Tail Assembly · Effective Apr 8, 1975
- [AD 75-07-07](https://openairdocs.org/ad/75-07-07.md): Emergency Hatch Handles · Effective Apr 8, 1975
- [AD 59-16-04](https://openairdocs.org/ad/59-16-04.md): Damper Trunnion Bolt · Effective Apr 8, 1975
- [AD 66-19-04](https://openairdocs.org/ad/66-19-04.md): Tail Rotor Blades · Effective Aug 14, 1966
- [AD 61-01-03](https://openairdocs.org/ad/61-01-03.md): Input Bevel Gear · Effective Dec 30, 1960
- [AD 60-24-04](https://openairdocs.org/ad/60-24-04.md): Electrical Cable · Effective Nov 28, 1960
- [AD 57-19-02](https://openairdocs.org/ad/57-19-02.md): Engine Cooling Fan Assembly
- [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 = '8141839')
  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/N506/ads

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