AD 74-20-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 310Q | Airworthiness Directives; CESSNA Models 310Q, 340, 402B, 414, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 340 | Airworthiness Directives; CESSNA Models 310Q, 340, 402B, 414, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 402B | Airworthiness Directives; CESSNA Models 310Q, 340, 402B, 414, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 414 | Airworthiness Directives; CESSNA Models 310Q, 340, 402B, 414, 421B Airplanes |
| aircraft | Cessna Aircraft Company | 421B | Airworthiness Directives; CESSNA Models 310Q, 340, 402B, 414, 421B Airplanes |
Unsafe Condition
Main landing gear trunnion failure due to cracks or forming flaws in the main landing gear assemblies within specified serial number blocks.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect main landing gear assemblies for specified serial numbers and check trunnions for cracks or flaws per Cessna Service Letter ME74-14. Repeat inspections every 25 hours' time in service until trunnions are replaced. Replace affected main landing gear upper struts within 100 hours' time in service or if cracks/flaws are found before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 25 hours' time in service after the effective date of this AD for initial inspections; repeat every 25 hours' time in service. Replace affected parts within 100 hours' time in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Cessna Models 310Q (Serial Numbers 1038 through 1069, 1071 through 1081, 1083 through 1086, 1088 through 1105, 1107, 1109, 1110, 1112, 1113, 1115 through 1118, 1122, 1123, 1125 and 1126); Model 340 (Serial Numbers 0325 through 0354); Model 402B (Serial Numbers 0575 through 0581, 0583 through 0586, 0588, 0590 through 0611, 0613, 0614 and 0617); Model 414 (Serial Numbers 0503 through 0529, 0531 and 0532); and Model 421B (Serial Numbers 0322, 0584 through 0625, 0627, 0629 through 0633, 0635 and 0636).
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Main Landing Gear Trunnion
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_74-20-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-20-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; CESSNA Models 310Q, 340, 402B, 414, 421B Airplanes Subject: Main Landing Gear Trunnion Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/25/1974 Make: Cessna Aircraft Company Model: 310Q | 340 | 402B | 414 | 421B 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: 74-20-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1966 AD NUMBER: 74-20-01 SUBJECT HEADING: Airworthiness Directives; CESSNA Models 310Q, 340, 402B, 414, 421B Airplanes ACTION: SUMMARY: DATES: Effective September 25, 1974. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-20-01 CESSNA: Amendment 39-1966. Applies to Models 310Q (Serial Numbers 1038 through 1069, 1071 through 1081, 1083 through 1086, 1088 through 1105, 1107, 1109, 1110, 1112, 1113, 1115 through 1118, 1122, 1123, 1125 and 1126); Model 340 (Serial Numbers 0325 through 0354); Model 402B (Serial Numbers 0575 through 0581, 0583 through 0586, 0588, 0590 through 0611, 0613, 0614 and 0617); Model 414 (Serial Numbers 0503 through 0529, 0531 and 0532); and Model 421B (Serial Numbers 0322, 0584 through 0625, 0627, 0629 through 0633, 0635 and 0636) airplanes. Compliance: Required as indicated, unless already accomplished. To preclude possible main landing gear trunnion failure, accomplish the following: A) Within 25 hours' time in service after the effective date of this AD, visually inspect the LH and RH main landing gear assembly to determine whether the landing gear assembly serial numbers fall within the following serial number blocks: Aircraft Models Affected Main Landing Gear Assembly Serials Affected L/H R/H Model 310Q B170 thru B279 W146 thru W273 Model 340 B199 thru B345 B164 thru B330 Model 402B B199 thru B345 B164 thru B330 Model 414 B199 thru B345 B164 thru B330 Model 421B W108 thru W185 W090 thru W170 If a main landing gear assembly falls within the above serial number blocks, visually inspect the trunnions for cracks or forming flaws in accordance with Cessna Service Letter ME74-14 dated August 9, 1974, or subsequent revisions. Repeat these inspections at intervals of 25 hours' time in service thereafter until the trunnions are replaced. B) If cracks or forming flaws are found during any inspection required by Paragraph A, prior to further flight, replace the main landing gear upper strut with an airworthy part in accordance with Cessna Service Kit 421-63. C) Within 100 hours' time in service after the effective date of this AD, replace main landing gear upper strut assemblies of the serial numbers listed in Paragraph A with an airworthy part in accordance with Cessna Service Kit 421-63. D) The inspections required by this AD may be discontinued upon replacement of the affected main landing gear upper strut assemblies. E) Any equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. This amendment becomes effective September 25, 1974. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_74-20-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-20-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; CESSNA Models 310Q, 340, 402B, 414, 421B Airplanes Subject: Main Landing Gear Trunnion Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 09/25/1974 Make: Cessna Aircraft Company Model: 310Q | 340 | 402B | 414 | 421B 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: 74-20-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1966 AD NUMBER: 74-20-01 SUBJECT HEADING: Airworthiness Directives; CESSNA Models 310Q, 340, 402B, 414, 421B Airplanes ACTION: SUMMARY: DATES: Effective September 25, 1974. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-20-01 CESSNA: Amendment 39-1966. Applies to Models 310Q (Serial Numbers 1038 through 1069, 1071 through 1081, 1083 through 1086, 1088 through 1105, 1107, 1109, 1110, 1112, 1113, 1115 through 1118, 1122, 1123, 1125 and 1126); Model 340 (Serial Numbers 0325 through 0354); Model 402B (Serial Numbers 0575 through 0581, 0583 through 0586, 0588, 0590 through 0611, 0613, 0614 and 0617); Model 414 (Serial Numbers 0503 through 0529, 0531 and 0532); and Model 421B (Serial Numbers 0322, 0584 through 0625, 0627, 0629 through 0633, 0635 and 0636) airplanes. Compliance: Required as indicated, unless already accomplished. To preclude possible main landing gear trunnion failure, accomplish the following: A) Within 25 hours' time in service after the effective date of this AD, visually inspect the LH and RH main landing gear assembly to determine whether the landing gear assembly serial numbers fall within the following serial number blocks: Aircraft Models Affected Main Landing Gear Assembly Serials Affected L/H R/H Model 310Q B170 thru B279 W146 thru W273 Model 340 B199 thru B345 B164 thru B330 Model 402B B199 thru B345 B164 thru B330 Model 414 B199 thru B345 B164 thru B330 Model 421B W108 thru W185 W090 thru W170 If a main landing gear assembly falls within the above serial number blocks, visually inspect the trunnions for cracks or forming flaws in accordance with Cessna Service Letter ME74-14 dated August 9, 1974, or subsequent revisions. Repeat these inspections at intervals of 25 hours' time in service thereafter until the trunnions are replaced. B) If cracks or forming flaws are found during any inspection required by Paragraph A, prior to further flight, replace the main landing gear upper strut with an airworthy part in accordance with Cessna Service Kit 421-63. C) Within 100 hours' time in service after the effective date of this AD, replace main landing gear upper strut assemblies of the serial numbers listed in Paragraph A with an airworthy part in accordance with Cessna Service Kit 421-63. D) The inspections required by this AD may be discontinued upon replacement of the affected main landing gear upper strut assemblies. E) Any equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. This amendment becomes effective September 25, 1974. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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