# Airworthiness directives that may apply: N91BU

A list on [N91BU](https://openairdocs.org/aircraft/N91BU.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 2026-13-02](https://openairdocs.org/ad/2026-13-02.md): Navigation · Effective Jul 1, 2026
- [AD 2024-01-02](https://openairdocs.org/ad/2024-01-02.md): Fuselage · Effective Jan 24, 2024
- [AD 2023-11-10](https://openairdocs.org/ad/2023-11-10.md): Fuselage · Effective Jul 11, 2023
- [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 2014-17-02](https://openairdocs.org/ad/2014-17-02.md): Communications · Effective Sep 9, 2014 · Supersedes AD 2013-18-09
- [AD 2008-14-10](https://openairdocs.org/ad/2008-14-10.md): Upper engine mount bolts · Effective Jul 22, 2008
- [AD 99-25-04](https://openairdocs.org/ad/99-25-04.md): Floor to Ring Fittings · Effective Jan 7, 2000
- [AD 97-04-15](https://openairdocs.org/ad/97-04-15.md): Fire Extinguisher Bottle Cartridges · Effective Mar 7, 1997
- [AD 95-07-03](https://openairdocs.org/ad/95-07-03.md): Auxiliary Power Units · Effective May 3, 1995
- [AD 79-18-12](https://openairdocs.org/ad/79-18-12.md): Auxiliary Power Units · Effective Oct 8, 1979
- [AD 2022-01-04](https://openairdocs.org/ad/2022-01-04.md): Turbine Engine Compressor Section · Effective Feb 2, 2022
- [AD 2020-20-04](https://openairdocs.org/ad/2020-20-04.md): Turbine Engine Reduction Gear · Effective Oct 14, 2020
- [AD 2018-17-04](https://openairdocs.org/ad/2018-17-04.md): Turbine section · Effective Sep 21, 2018
- [AD 2015-02-08](https://openairdocs.org/ad/2015-02-08.md): Turbine wheels · Effective Mar 11, 2015
- [AD 2009-11-04](https://openairdocs.org/ad/2009-11-04.md): Propeller gearbox (PGB) · Effective Jun 26, 2009
- [AD 2006-25-13](https://openairdocs.org/ad/2006-25-13.md): Compressor cone shaft assemblies · Effective Dec 29, 2006
- [AD 2001-17-31](https://openairdocs.org/ad/2001-17-31.md): Second Stage High Pressure Turbine Wheel · Effective Oct 5, 2001
- [AD 99-03-09](https://openairdocs.org/ad/99-03-09.md): Turbine wheel failure · Effective Feb 19, 1999
- [AD 2013-18-09](https://openairdocs.org/ad/2013-18-09.md): Communications · Historical · Effective Oct 3, 2013 · Replaced by AD 2014-17-02
- [AD 74-08-09 R2](https://openairdocs.org/ad/74-08-09-R2.md): Waste Receptacles · Historical · Effective Jul 29, 1996 · Replaced by AD 74-08-09 R3

## 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 = '5264153'
    UNION ALL SELECT ad_id, 2, 'engine' FROM 'https://openairdocs.org/data/latest/faa_engine_model_directive.parquet' WHERE engine_model_code = '54143')
  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/N91BU/ads

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