# AD 75-09-07: Mixture Control Wires - Type: Airworthiness directive - Status: Current - Products: True Flight Holdings AA-1, AA-1A and AA-1B - Effective: April 25, 1975 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-2180 - Registered aircraft: 618 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/650EF5216513544186256A38005DF83B.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/75-09-07 ## The airworthiness directive 75-09-07 GRUMMAN AMERICAN: Amendment 39-2180. Applies to all Model AA-1, AA-1A, and AA-1B airplanes certificated in all categories. Compliance: Required as indicated, unless previously accomplished. The aircraft may be flown to a facility where the inspection and/or replacement can be performed after expiration of the 50 hours time in service after the effective date of this AD. To prevent mixture control wire failures accomplish the following within the next 50 hours time in service after the effective date of this AD, and thereafter as indicated, in accordance with Grumman American Service Bulletin No. 144A or later FAA approved revision or an equivalent method approved by the Chief, Engineering and Manufacturing Branch, Great Lakes Region. A. Replace mixture control wires having 500 or more hours time in service in accordance with the referenced service bulletin. B. Repeat A at intervals not to exceed 500 hours in service. C. Inspect the mixture control in accordance with the referenced service bulletin and replace the mixture control wire if kinked or misrigged. D. Repeat C at intervals not to exceed 100 hours time in service. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Grumman American Aviation Corporation, 318 Bishop Road, Cleveland, Ohio 44143. These documents may also be examined at Great Lakes Regional Office, 2300 East Devon Avenue, Des Plaines, Illinois 60018 and at FAA Headquarters, 800 Independence Avenue, S.W., Washington D.C. A historical file on this AD which includes the incorporated material in full is maintained by the FAA at its headquarters in Washington D.C., and at Great Lakes Region. This amendment becomes effective April 25, 1975. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A11EA](https://openairdocs.org/tcds/A11EA): True Flight Holdings LLC; names 3 of 4 models: AA-1A, AA-1, AA-1B ## 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: 618 (618 by airframe model, 0 by engine model) - Makers: American 386, Grumman American Avn. 232 Models with the most aircraft: - [Grumman American Avn. AA-1B](https://openairdocs.org/model/grumman-american-avn-aa-1b): 231 aircraft (airframe model) - [American AA-1A](https://openairdocs.org/model/american-aa-1a): 207 aircraft (airframe model) - [American AA-1](https://openairdocs.org/model/american-aa-1): 153 aircraft (airframe model) - [American AA-1B](https://openairdocs.org/model/american-aa-1b): 26 aircraft (airframe model) - [Grumman American Avn. AA-1A](https://openairdocs.org/model/grumman-american-avn-aa-1a): 1 aircraft (airframe model) All 5 models: https://openairdocs.org/ad/75-09-07/models.md Every aircraft: https://openairdocs.org/ad/75-09-07/aircraft.md Its text cites no advisory circulars or STCs. ## NTSB investigations that cite this AD (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB CEN14LA221](https://openairdocs.org/ntsb/CEN14LA221), Apr 21, 2014: American AA 1 (N481HY), Peyton, CO, destroyed. Probable cause: The loss of directional control during takeoff for reasons that could not be determined due to the extent of fire damage. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.