AD 72-12-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 401 | Airworthiness Directives; CESSNA Model 401 and 402 Series Airplanes |
| aircraft | Cessna Aircraft Company | 401A | Airworthiness Directives; CESSNA Model 401 and 402 Series Airplanes |
| aircraft | Cessna Aircraft Company | 401B | Airworthiness Directives; CESSNA Model 401 and 402 Series Airplanes |
| aircraft | Cessna Aircraft Company | 402 | Airworthiness Directives; CESSNA Model 401 and 402 Series Airplanes |
| aircraft | Cessna Aircraft Company | 402A | Airworthiness Directives; CESSNA Model 401 and 402 Series Airplanes |
| aircraft | Cessna Aircraft Company | 402B | Airworthiness Directives; CESSNA Model 401 and 402 Series Airplanes |
Unsafe Condition
Chafing of fuel lines with possible fire hazard due to fuel leakage in the wing leading edge.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect fuel crossfeed lines for chafing at firewall vertical stiffeners, replace chafed fuel lines with serviceable parts, install fuel line support clamps per Cessna Service Letters ME68-6 or ME68-27, maintain minimum clearance, replace firewall access plate screws, and use specified screws for firewall vertical stiffeners.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 50 hours' time in service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Cessna Models 401 and 402 series airplanes with serial numbers 401-0001 thru 401B0216 and 402-0001 thru 402B0220, excluding specific serial numbers listed in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Support Of Fuel Lines
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_72-12-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 72-12-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; CESSNA Model 401 and 402 Series Airplanes Subject: Support Of Fuel Lines Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 06/16/1972 Make: Cessna Aircraft Company Model: 401 | 401A | 401B | 402 | 402A | 402B 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: 72-12-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1459 AD NUMBER: 72-12-04 SUBJECT HEADING: Airworthiness Directives; CESSNA Model 401 and 402 Series Airplanes ACTION: SUMMARY: DATES: Effective June 16, 1972. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 72-12-04 CESSNA: Amdt. 39-1459. Applies to Models 401 and 402 series airplanes. Compliance: Required within 50 hours' time in service after the effective date of this AD, unless already accomplished. To assure proper support of fuel lines and to eliminate chafing of fuel lines with possible fire hazard due to fuel leakage in the wing leading edge, accomplish the following: A) On airplanes (Serial Numbers 401-0001 thru 401-0225 and 402-0001 thru 402-0225, except 402-0171, 402-0172, 401-0189, 402-0191, 401-0197, 402-0209, 402-0210, 402-0212, 401-0214 thru 401-0225, and 402-0214 thru 402-0225), remove the engine cowling, turbo supercharger and the firewall access opening for both engines. Visually inspect the fuel crossfeed lines for chafing at the firewall vertical stiffeners. Replace chafed fuel lines with a serviceable part and install fuel line support clamps in accordance with Cessna Service Letter ME68-6, dated April 16, 1968, or later revision, or any equivalent method approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. Maintain a minimum of .50 inch clearance between the fuel crossfeed lines and the firewall vertical stiffener. Replace firewall access plate using AN515-8R5 or equivalent screws or screws removed from firewall that do not exceed 5/16 inches in length. B) On airplanes (Serial Numbers 401-0001 thru 401A0010 and 402-0001 thru 402-0319 except 401A0001, 401A0003, 402-0218, 402-0298 and 402-0317), remove all inspection access plates in wing leading edge outboard of the engine nacelle and visually inspect main fuel supply and vapor return lines for chafing. Replace chafed fuel lines with a serviceable part and install fuel line support clamps in accordance with Cessna Service Letter ME68-27, dated December 27, 1968, or later revision, or any equivalent method approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. C) On airplanes (Serial Numbers 401-0226 thru 401B0216 and 402-0226 thru 402B0220: (1) Remove the engine cowling and screws from the firewall vertical stiffener as shown in Cessna Service Letter ME72-11, dated May 26, 1972, or later revision. (2) If screws removed are more than .312 inches in length, remove firewall inspection plate and inspect fuel crossfeed lines for chafing and replace any chafed fuel line with a serviceable part. (3) Replace screws removed from firewall vertical stiffener with MS35266-60 screws. Cessna Service Letter ME72-11, dated May 26, 1972, or later revision, pertains to the subject matter of this paragraph. This amendment becomes effective June 16, 1972. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_72-12-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 72-12-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; CESSNA Model 401 and 402 Series Airplanes Subject: Support Of Fuel Lines Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 06/16/1972 Make: Cessna Aircraft Company Model: 401 | 401A | 401B | 402 | 402A | 402B 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: 72-12-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1459 AD NUMBER: 72-12-04 SUBJECT HEADING: Airworthiness Directives; CESSNA Model 401 and 402 Series Airplanes ACTION: SUMMARY: DATES: Effective June 16, 1972. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 72-12-04 CESSNA: Amdt. 39-1459. Applies to Models 401 and 402 series airplanes. Compliance: Required within 50 hours' time in service after the effective date of this AD, unless already accomplished. To assure proper support of fuel lines and to eliminate chafing of fuel lines with possible fire hazard due to fuel leakage in the wing leading edge, accomplish the following: A) On airplanes (Serial Numbers 401-0001 thru 401-0225 and 402-0001 thru 402-0225, except 402-0171, 402-0172, 401-0189, 402-0191, 401-0197, 402-0209, 402-0210, 402-0212, 401-0214 thru 401-0225, and 402-0214 thru 402-0225), remove the engine cowling, turbo supercharger and the firewall access opening for both engines. Visually inspect the fuel crossfeed lines for chafing at the firewall vertical stiffeners. Replace chafed fuel lines with a serviceable part and install fuel line support clamps in accordance with Cessna Service Letter ME68-6, dated April 16, 1968, or later revision, or any equivalent method approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. Maintain a minimum of .50 inch clearance between the fuel crossfeed lines and the firewall vertical stiffener. Replace firewall access plate using AN515-8R5 or equivalent screws or screws removed from firewall that do not exceed 5/16 inches in length. B) On airplanes (Serial Numbers 401-0001 thru 401A0010 and 402-0001 thru 402-0319 except 401A0001, 401A0003, 402-0218, 402-0298 and 402-0317), remove all inspection access plates in wing leading edge outboard of the engine nacelle and visually inspect main fuel supply and vapor return lines for chafing. Replace chafed fuel lines with a serviceable part and install fuel line support clamps in accordance with Cessna Service Letter ME68-27, dated December 27, 1968, or later revision, or any equivalent method approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. C) On airplanes (Serial Numbers 401-0226 thru 401B0216 and 402-0226 thru 402B0220: (1) Remove the engine cowling and screws from the firewall vertical stiffener as shown in Cessna Service Letter ME72-11, dated May 26, 1972, or later revision. (2) If screws removed are more than .312 inches in length, remove firewall inspection plate and inspect fuel crossfeed lines for chafing and replace any chafed fuel line with a serviceable part. (3) Replace screws removed from firewall vertical stiffener with MS35266-60 screws. Cessna Service Letter ME72-11, dated May 26, 1972, or later revision, pertains to the subject matter of this paragraph. This amendment becomes effective June 16, 1972. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
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