# AD 69-13-07: Collective Yoke Support Brackets

- Type: Airworthiness directive
- Status: Current
- Products: Hiller UH-12D, UH-12L, UH-12L4, UH-12E and UH-12E-L
- Effective: April 30, 1970
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-970
- Registered aircraft: 132 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/2F168F62C4B8A54286256E01005473F1.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/69-13-07

## The airworthiness directive

69-13-07 FAIRCHILD HILLER: Amdt. 39-789 as amended by Amendment 39-970. Applies to UH-12D, UH-12E, UH-12E-L, UH-12L and UH-12L4 type helicopters certified in all categories.

Compliance required as indicated.

To prevent failure of the attachment of collective yoke support brackets, P/N 31351 or 31483, to upper transmission housings, P/N 23541 or 23541-5, accomplish the following:

  (a) Within the next 10 hours time in service after the effective date of this AD, unless already accomplished, inspect the collective yoke support bracket attachment bolts for torque and visually inspect the Rosan inserts in the transmission housing for cracks or any other damage. Replace damaged inserts, and inserts where a bolt torque of less than 50 inch pounds is encountered, prior to further flight in accordance with Fairchild Hiller Service Bulletins SB UH12L-23-1 and SB UH12D thru G-23-1 dated May 20, 1969 or an alternate method approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.

  (b) Within the next 100 hours' time in service after the effective date of this AD, unless already accomplished, remove the Rosan R206SB-8 inserts and install Rosan RD206SB-8 inserts in their place, and install MS20073-04-7 bolts in accordance with Fairchild Hiller Service Bulletins SB UH12L-23-1 and SB UH12D thru G-23-1 dated May 20, 1969 or an alternate method approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. Where oversize Rosan R231SB-8 inserts have been installed, replace with Rosan RD231SB-8 inserts and RL-31-SB-9 locking rings in accordance with Fairchild Hiller Service Bulletins UH12L-23-1 and UH12D through G-23-1 dated 19 January 1970 or an alternate method approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.

Amendment 39-789 effective July 9, 1969. This Amendment (39-970) is effective April 30, 1970.

## Affected data sheets (3) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 4H11](https://openairdocs.org/tcds/4H11): Siam Hiller Holdings Inc.; names 2 of 2 models: UH-12E, UH-12E-L
- [TCDS H1WE](https://openairdocs.org/tcds/H1WE): Siam Hiller Holdings Inc.; names 2 of 2 models: UH-12L4, UH-12L
- [TCDS 4H10](https://openairdocs.org/tcds/4H10): Siam Hiller Holdings Inc.; names 1 of 1 models: UH-12D

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 132 (132 by airframe model, 0 by engine model)
- Makers: Hiller 129, Hiller-Osborn 2, Hiller-Rogerson Helicopter 1

Models with the most aircraft:

- [Hiller UH-12E](https://openairdocs.org/model/hiller-uh-12e): 103 aircraft (airframe model)
- [Hiller UH-12D](https://openairdocs.org/model/hiller-uh-12d): 22 aircraft (airframe model)
- [Hiller UH-12L4](https://openairdocs.org/model/hiller-uh-12l4): 3 aircraft (airframe model)
- [Hiller-Osborn UH-12D](https://openairdocs.org/model/hiller-osborn-uh-12d): 2 aircraft (airframe model)
- [Hiller UH-12E-L](https://openairdocs.org/model/hiller-uh-12e-l): 1 aircraft (airframe model)
- [Hiller-Rogerson Helicopter UH12E](https://openairdocs.org/model/hiller-rogerson-helicopter-uh12e): 1 aircraft (airframe model)

All 7 models: https://openairdocs.org/ad/69-13-07/models.md
Every aircraft: https://openairdocs.org/ad/69-13-07/aircraft.md

Its text cites no advisory circulars or STCs.

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