# Airworthiness directives: TCDS 4H12

A list on [TCDS 4H12](https://openairdocs.org/tcds/4H12.md).

ADs whose products are models on this data sheet, matched by model and maker. Those in force first, newest first.

Page 1 of 2 · 67 ADs

- [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 2018-02-13](https://openairdocs.org/ad/2018-02-13.md): Engine/Transmission Coupling · Effective Mar 5, 2018 · Supersedes AD 2017-07-02
- [AD 2017-14-06](https://openairdocs.org/ad/2017-14-06.md): Main Rotor Drive System · Effective Aug 25, 2017 · Supersedes AD 93-17-13
- [AD 2015-23-01](https://openairdocs.org/ad/2015-23-01.md): Tail Rotor Drive · Effective Dec 15, 2015
- [AD 2015-11-09](https://openairdocs.org/ad/2015-11-09.md): Main Rotor Drive System · Effective Jul 14, 2015
- [AD 2013-03-04](https://openairdocs.org/ad/2013-03-04.md): Rotorcraft tailboom · Effective Mar 19, 2013
- [AD 2011-12-16](https://openairdocs.org/ad/2011-12-16.md): Rotorcraft Tailboom · Effective Jul 21, 2011 · Supersedes AD 2011-01-52
- [AD 2010-16-08](https://openairdocs.org/ad/2010-16-08.md): Rotorcraft Cooling Fan System · Effective Aug 20, 2010
- [AD 2006-12-07](https://openairdocs.org/ad/2006-12-07.md): ECi cylinder assemblies · Effective Jul 11, 2006 · Supersedes AD 2005-26-10
- [AD 2005-10-12](https://openairdocs.org/ad/2005-10-12.md): Lateral control trim actuator assembly · Effective Jun 2, 2005
- [AD 2003-13-15 R1](https://openairdocs.org/ad/2003-13-15-R1.md): Aft cluster fittings · Effective Aug 10, 2004 · Supersedes AD 2003-13-15
- [AD 2003-09-05](https://openairdocs.org/ad/2003-09-05.md): Aluminum horizontal stabilizer endplate · Effective May 16, 2003
- [AD 2000-16-05](https://openairdocs.org/ad/2000-16-05.md): Tail Rotor Swashplate Shaft · Effective Sep 19, 2000 · Supersedes AD 99-17-10
- [AD 99-04-14](https://openairdocs.org/ad/99-04-14.md): Main Rotor Blade · Effective Mar 23, 1999
- [AD 98-26-06](https://openairdocs.org/ad/98-26-06.md): Shaft · Effective Feb 3, 1999
- [AD 98-18-11](https://openairdocs.org/ad/98-18-11.md): Main Rotor Blade · Effective Oct 7, 1998
- [AD 97-23-06](https://openairdocs.org/ad/97-23-06.md): Ring Gear Teeth Inspection · Effective Dec 10, 1997
- [AD 97-05-06](https://openairdocs.org/ad/97-05-06.md): Main Rotor Thrust Bearing · Effective Apr 7, 1997
- [AD 95-21-02](https://openairdocs.org/ad/95-21-02.md): Main Rotor Drive Shaft · Effective Nov 17, 1995
- [AD 95-03-12](https://openairdocs.org/ad/95-03-12.md): Clutch Control Spring Assembly · Effective Mar 1, 1995
- [AD 94-16-04](https://openairdocs.org/ad/94-16-04.md): Tail Rotor Pedal support Structure · Effective Oct 5, 1994
- [AD 94-12-06](https://openairdocs.org/ad/94-12-06.md): Lower Pulley Bearings · Effective Sep 19, 1994
- [AD 94-13-04](https://openairdocs.org/ad/94-13-04.md): Clutch Control Spring Assembly · Effective Sep 1, 1994
- [AD 93-21-03](https://openairdocs.org/ad/93-21-03.md): Magnesium Tailboom Fitting · Effective Dec 17, 1993
- [AD 93-05-11](https://openairdocs.org/ad/93-05-11.md): Fuel Pump Drain Tube Assembly · Effective May 25, 1993
- [AD 91-05-18](https://openairdocs.org/ad/91-05-18.md): Tailboom · Effective Mar 29, 1991
- [AD 89-20-03 R1](https://openairdocs.org/ad/89-20-03-R1.md): Tail Rotor Blades · Effective Feb 22, 1991
- [AD 90-09-07](https://openairdocs.org/ad/90-09-07.md): Cyclic Control Rod Assembly · Effective Oct 3, 1990
- [AD 90-06-10](https://openairdocs.org/ad/90-06-10.md): Throttle Cable Assembly · Effective Apr 6, 1990
- [AD 88-17-04](https://openairdocs.org/ad/88-17-04.md): Aft Cluster Fittings · Effective Aug 19, 1988
- [AD 88-12-02](https://openairdocs.org/ad/88-12-02.md): Tail Rotor Retention Strap · Effective Jun 10, 1988
- [AD 82-15-01 R1](https://openairdocs.org/ad/82-15-01-R1.md): Main Transmission · Effective Oct 4, 1982
- [AD 82-15-03](https://openairdocs.org/ad/82-15-03.md): Rotor System · Effective Jul 16, 1982
- [AD 81-17-01](https://openairdocs.org/ad/81-17-01.md): Starting Vibrator Assemblies · Effective Aug 13, 1981
- [AD 79-23-03 R1](https://openairdocs.org/ad/79-23-03-R1.md): Tail Rotor Blades · Effective Nov 19, 1979
- [AD 78-26-04](https://openairdocs.org/ad/78-26-04.md): Tail Rotor Hub Assembly · Effective Dec 27, 1978
- [AD 78-25-04](https://openairdocs.org/ad/78-25-04.md): Pinion Assemblies · Effective Dec 18, 1978
- [AD 78-02-02](https://openairdocs.org/ad/78-02-02.md): Tail Rotor Control Pedals · Effective Jan 24, 1978
- [AD 77-23-08](https://openairdocs.org/ad/77-23-08.md): Cracks in Main Rotor Blades · Effective Dec 27, 1977
- [AD 77-07-01](https://openairdocs.org/ad/77-07-01.md): Clutch Actuator · Effective Apr 4, 1977
- [AD 76-10-02](https://openairdocs.org/ad/76-10-02.md): Lateral control · Effective May 21, 1976
- [AD 75-15-02](https://openairdocs.org/ad/75-15-02.md): Throttle and Engine Power Control · Effective Jul 15, 1975
- [AD 74-21-04](https://openairdocs.org/ad/74-21-04.md): Canopy Slats · Effective Apr 4, 1975
- [AD 75-08-12](https://openairdocs.org/ad/75-08-12.md): Actuator and Cover · Effective Mar 7, 1975
- [AD 73-11-01](https://openairdocs.org/ad/73-11-01.md): Idler Pulley Bearing Failure · Effective May 21, 1973
- [AD 71-20-05](https://openairdocs.org/ad/71-20-05.md): Idler Pulley Bearings · Effective Dec 18, 1971
- [AD 70-08-01](https://openairdocs.org/ad/70-08-01.md): Flapping Hinge Bolts · Effective Apr 14, 1970
- [AD 70-01-06](https://openairdocs.org/ad/70-01-06.md): Lateral pitch idler bell crank · Effective Jan 17, 1970
- [AD 69-04-03](https://openairdocs.org/ad/69-04-03.md): Rotor Blade · Effective Mar 22, 1969
- [AD 68-26-01](https://openairdocs.org/ad/68-26-01.md): Lower Coupling Drive Shaft · Effective Dec 21, 1968

Next page: https://openairdocs.org/tcds/4H12/ads.md?page=2

## 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
FROM 'https://openairdocs.org/data/latest/faa_directive.parquet' d
WHERE d.ad_id IN (SELECT ad_id FROM 'https://openairdocs.org/data/latest/faa_directive_product.parquet' WHERE tcds_number = '4H12')
ORDER BY d.status = 'Historical', coalesce(d.effective_date, d.publication_date) DESC
```

This list as a web page: https://openairdocs.org/tcds/4H12/ads

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