# AD 67-09-04: Control Surface Lock

- Type: Airworthiness directive
- Status: Current
- Products: Allied Ag Cat Productions G-164 and G-164A
- Effective: March 24, 1967
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-374
- Registered aircraft: 272 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/7DDC776BDC0BE52986256A54006FC1D7.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/67-09-04

## The airworthiness directive

67-09-04 GRUMMAN: Amdt. 39-374 Part 39 Federal Register March 24, 1967. Applies to Models G-164 and G-164A Restricted Category Airplanes, Serial Numbers 301 through 450, and Serial Numbers below 301 Which Have Been Modified to Incorporate Parking Brake Installation and Stick Control Lock Kit P/N A1521-301K.

Compliance required as indicated unless already accomplished.

To prevent fouling of the control stick by the surface control lock and inadvertent locking of the right toe brake master cylinder during flight maneuvering, accomplish the following:

  (a) On Model G-164 airplanes, Serial Numbers 301 through 400: Within the next 25 hours' time in service after April 7, 1966, install a tension spring and two "S" hooks in accordance with Grumman Aircraft Engineering Corporation drawing A1521, Revision B, Sheet 2 or equivalent approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.

  (b) On all airplanes listed in the applicability statement: Within the next 25 hours' time in service after the effective date of this AD, modify the parking brake and stick control lock installation in accordance with Grumman Aircraft Engineering Corporation AG-CAT Service Bulletin No. 39, February 15, 1967, or later revision approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region, or equivalent modification approved by the Chief, Engineering & Manufacturing Branch, FAA Eastern Region.

  (c) Compliance time specified in (b) may be increased upon approval by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region, of the appropriate request with substantiating data submitted to an FAA maintenance inspector.

This supersedes AD 66-10-02.

This directive effective March 24, 1967.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1A16](https://openairdocs.org/tcds/1A16): Allied Ag Cat Productions Inc.; names 2 of 10 models: G-164, G-164A

## 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: 272 (272 by airframe model, 0 by engine model)
- Makers: Grumman Acft ENG Cor-Schweizer 150, Grumman 115, Grumman American Avn. 6, Schweizer 1

Models with the most aircraft:

- [Grumman Acft ENG Cor-Schweizer G-164A](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164a): 150 aircraft (airframe model)
- [Grumman G-164A](https://openairdocs.org/model/grumman-g-164a): 63 aircraft (airframe model)
- [Grumman G-164](https://openairdocs.org/model/grumman-g-164): 52 aircraft (airframe model)
- [Grumman American Avn. G-164](https://openairdocs.org/model/grumman-american-avn-g-164): 3 aircraft (airframe model)
- [Grumman American Avn. G-164A](https://openairdocs.org/model/grumman-american-avn-g-164a): 3 aircraft (airframe model)
- [Schweizer G164A](https://openairdocs.org/model/schweizer-g164a): 1 aircraft (airframe model)

All 6 models: https://openairdocs.org/ad/67-09-04/models.md
Every aircraft: https://openairdocs.org/ad/67-09-04/aircraft.md

Its text cites no advisory circulars or STCs.

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