# AD 76-13-10: Landing Gear Strut - Type: Airworthiness directive - Status: Current - Products: Allied Ag Cat Productions G-164 and G-164A - Effective: November 30, 1976 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-2777 - Registered aircraft: 272 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/38ED726F17EC4D9886256E120055A96A.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/76-13-10 ## The airworthiness directive 76-13-10 GRUMMAN AMERICAN: Amendment 39-2657 as amended by Amendment 39-2777. Applies to Model G-164 and G-164A Ag-Cat Airplanes, S/N 1 through 1064, certificated in all categories. Compliance required as indicated. To prevent possible hazards associated with main landing gear strut failures, accomplish the following: (a) For airplanes equipped with Grumman American main landing gear struts P/N A1515-11, -12, P/N A1530-11, -12, and Cessna struts P/N 0341109-1, -2: (1) Within the next 100 landings after the effective date of this airworthiness directive, unless accomplished within the last 4400 landings, remove the gear struts and inspect the struts for cracks using dye penetrant or magnetic particle inspection procedures or with an FAA approved equivalent inspection procedure. (2) Repeat the inspections of paragraph (a)(1) at intervals not to exceed 4500 landings. (3) Inspect the struts for cracks and corrosion damage using dye penetrant inspection procedures,at each 1000 landings following the inspections specified in paragraph (a)(1) and (a)(2). This inspection can be conducted without removing the gear struts from the aircraft. (b) Replace cracked or corroded parts prior to further flight with unused struts, Grumman American P/N A1530-33, -34 or with FAA approved equivalent parts. (c) For the purpose of complying with this airworthiness directive, subject to the acceptance by the assigned FAA maintenance inspector, the number of landings may be determined by dividing each airplane's hours' time in service by the operator's fleet average time for takeoff to landing for the airplane type. (d) Equivalent inspections and parts must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region. (e) Upon submission of substantiating data by an owner or operator through an FAA Maintenance Inspector, the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region, may adjust the compliance time in this AD. Grumman American Aviation Corporation Service Note No. 13 covers this same subjects. Amendment 39-2657 was effective July 7, 1976. This Amendment 39-2777 is effective November 30, 1976. ## 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/76-13-10/models.md Every aircraft: https://openairdocs.org/ad/76-13-10/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 SEA85LA098](https://openairdocs.org/ntsb/SEA85LA098), Apr 26, 1985: Grumman G-164A (N5285), Kendrick, ID, substantial 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.