AD 76-21-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Allied Ag Cat Productions, Inc. | G-164 | Airworthiness Directives; Grumman Model G-164 Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164A | Airworthiness Directives; Grumman Model G-164 Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164B | Airworthiness Directives; Grumman Model G-164 Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164B-15T | Airworthiness Directives; Grumman Model G-164 Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164B-20T | Airworthiness Directives; Grumman Model G-164 Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164B-34T | Airworthiness Directives; Grumman Model G-164 Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164B (with 73 inch wing gap) | Airworthiness Directives; Grumman Model G-164 Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164C | Airworthiness Directives; Grumman Model G-164 Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164D | Airworthiness Directives; Grumman Model G-164 Airplanes |
| aircraft | Allied Ag Cat Productions, Inc. | G-164D (with 73 inch wing gap) | Airworthiness Directives; Grumman Model G-164 Airplanes |
Unsafe Condition
Main landing gear strut failures associated with Frenco Co. P/N 1428 struts installed under STC SA647WE.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect main gear struts P/N 1428 for cracks via dye penetrant or magnetic particle inspection within 100 landings after AD effective date (if not done in last 1900 landings), then every 2000 landings. Replace cracked struts with unused same P/N before flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 100 landings after the effective date of this airworthiness directive, unless accomplished within the last 1900 landings, and thereafter at intervals not to exceed 2000 landings from the last inspection
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Grumman Model G-164 airplanes with Frenco Co. main landing gear struts P/N 1428 installed under STC SA647WE
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Main Landing Gear Struts
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_76-21-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 76-21-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Grumman Model G-164 Airplanes Subject: Main Landing Gear Struts Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/20/1976 Make: Allied Ag Cat Productions, Inc. Model: G-164 | G-164A | G-164B | G-164B-15T | G-164B-20T | G-164B-34T | G-164B (with 73 inch wing gap) | G-...Show more Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 76-21-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2746 AD NUMBER: 76-21-03 SUBJECT HEADING: Airworthiness Directives; Grumman Model G-164 Airplanes ACTION: SUMMARY: DATES: Effective October 20, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 76-21-03 GRUMMAN AMERICAN: Amendment 39-2746. Applies to Model G-164 airplanes certificated in all categories incorporating Frenco Co. main landing gear struts P/N 1428, installed in accordance with STC SA647WE. Compliance required as indicated. To prevent possible hazards associated with main landing gear strut failures, accomplish the following: (a) Within the next 100 landings after the effective date of this airworthiness directive, unless accomplished within the last 1900 landings, and thereafter at intervals not to exceed 2000 landings from the last inspection, remove the main gear struts, Frenco Co. P/N 1428, and inspect the struts for cracks using dye penetrant and a glass of at least 10 power or magnetic particles inspection. "Note: During the inspection required by paragraph (a) particular attention should be directed to the upper bend radius, and fuselage attachment area." (b) If cracks are found, before further flight, replace the cracked strut with an unused strut of the same part number. (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 from takeoff to landing for the airplane type. (d) Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Aircraft Engineering Division, FAA Western Region may adjust the repetitive inspection interval specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for that operator. (e) Equivalent inspection procedures or parts may be used when approved by the Chief, Aircraft Engineering Division, FAA Western Region. This amendment becomes effective October 20, 1976. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_76-21-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 76-21-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Grumman Model G-164 Airplanes Subject: Main Landing Gear Struts Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/20/1976 Make: Allied Ag Cat Productions, Inc. Model: G-164 | G-164A | G-164B | G-164B-15T | G-164B-20T | G-164B-34T | G-164B (with 73 inch wing gap) | G-...Show more Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 76-21-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2746 AD NUMBER: 76-21-03 SUBJECT HEADING: Airworthiness Directives; Grumman Model G-164 Airplanes ACTION: SUMMARY: DATES: Effective October 20, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 76-21-03 GRUMMAN AMERICAN: Amendment 39-2746. Applies to Model G-164 airplanes certificated in all categories incorporating Frenco Co. main landing gear struts P/N 1428, installed in accordance with STC SA647WE. Compliance required as indicated. To prevent possible hazards associated with main landing gear strut failures, accomplish the following: (a) Within the next 100 landings after the effective date of this airworthiness directive, unless accomplished within the last 1900 landings, and thereafter at intervals not to exceed 2000 landings from the last inspection, remove the main gear struts, Frenco Co. P/N 1428, and inspect the struts for cracks using dye penetrant and a glass of at least 10 power or magnetic particles inspection. "Note: During the inspection required by paragraph (a) particular attention should be directed to the upper bend radius, and fuselage attachment area." (b) If cracks are found, before further flight, replace the cracked strut with an unused strut of the same part number. (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 from takeoff to landing for the airplane type. (d) Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Aircraft Engineering Division, FAA Western Region may adjust the repetitive inspection interval specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for that operator. (e) Equivalent inspection procedures or parts may be used when approved by the Chief, Aircraft Engineering Division, FAA Western Region. This amendment becomes effective October 20, 1976. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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Related Airworthiness Directives
89-18-02 R1
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