AD 74-18-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lavia Argentina S.A. (Laviasa) | PA-25-235 | Airworthiness Directives; Piper Models PA-25-235 and PA-25-260 Airplanes |
| aircraft | Lavia Argentina S.A. (Laviasa) | PA-25-260 | Airworthiness Directives; Piper Models PA-25-235 and PA-25-260 Airplanes |
Unsafe Condition
Fuel unbalance and fuel line chafing due to improper installation of fuel tank vents and grommets, leading to potential fuel line damage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install vent line clamp assembly with specified fasteners, position fuel tank vents 3/4 inch below wing fabric, inspect and secure fuel line grommets, replace damaged lines, correct improperly installed grommets, and cut access openings if necessary to ensure proper installation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 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
Piper Models PA-25-235 and PA-25-260 airplanes, serial numbers 25-7405573 to 25-7405673 inclusive
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Fuel Lines
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_74-18-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-18-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Piper Models PA-25-235 and PA-25-260 Airplanes Subject: Fuel Lines Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 08/27/1974 Make: Lavia Argentina S.A. (Laviasa) Model: PA-25-235 | PA-25-260 Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 74-18-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1929 AD NUMBER: 74-18-02 SUBJECT HEADING: Airworthiness Directives; Piper Models PA-25-235 and PA-25-260 Airplanes ACTION: SUMMARY: DATES: Effective August 27, 1974. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-18-02 PIPER: Amendment 39-1929. Applies to Models PA-25-235 and PA-25-260 airplanes, Serial numbers 25-7405573 to 25-7405673 inclusive, certificated in all categories. Compliance required within the next 50 hours' time in service after the effective date of this AD, unless already accomplished. To prevent possible fuel unbalance and fuel line chafing, accomplish the following: (a) (1) Install the vent line clamp assembly Piper Part Number 60383-02 using four stainless steel 6 x 3/8 L type A Truss Phillips Head screws, one MS35206-228 screw and one MS20365-632C nut on both right and left wings at the fuel tank vents. (2) Position both right and left fuel tank vents so that they project 3/4 inch below the wing fabric and secure with the vent line clamps. (b) Inspect all fuel line grommets (15 per wing) in the left and right wings for proper position and security as follows: (1) Remove inspection covers from bottom of wing and inspect the grommets on each fuel line (using light and mirror) to insure that they are correctly installed in the holes of the fuel line support plates. (2) Replace all lines that have been damaged by chafing wear with serviceable lines of the same part numbers or equivalent lines approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, Southern Region. (3) Correct installation of any grommet not properly installed. (4) If any of the grommets are not properly installed at a support plate that cannot be reached through the existing inspection hole, it will be necessary to cut additional access openings in bottom of wing as required, install cover plate grommet part number 85012-78 and inspection cover plate part number 12761-02 over any new opening in fabric and install existing inspection covers. Piper Service letter No. 721 Parts II and III, or other approved later revision, pertains to this same subject. This amendment becomes effective August 27, 1974. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_74-18-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-18-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Piper Models PA-25-235 and PA-25-260 Airplanes Subject: Fuel Lines Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 08/27/1974 Make: Lavia Argentina S.A. (Laviasa) Model: PA-25-235 | PA-25-260 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: 74-18-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1929 AD NUMBER: 74-18-02 SUBJECT HEADING: Airworthiness Directives; Piper Models PA-25-235 and PA-25-260 Airplanes ACTION: SUMMARY: DATES: Effective August 27, 1974. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-18-02 PIPER: Amendment 39-1929. Applies to Models PA-25-235 and PA-25-260 airplanes, Serial numbers 25-7405573 to 25-7405673 inclusive, certificated in all categories. Compliance required within the next 50 hours' time in service after the effective date of this AD, unless already accomplished. To prevent possible fuel unbalance and fuel line chafing, accomplish the following: (a) (1) Install the vent line clamp assembly Piper Part Number 60383-02 using four stainless steel 6 x 3/8 L type A Truss Phillips Head screws, one MS35206-228 screw and one MS20365-632C nut on both right and left wings at the fuel tank vents. (2) Position both right and left fuel tank vents so that they project 3/4 inch below the wing fabric and secure with the vent line clamps. (b) Inspect all fuel line grommets (15 per wing) in the left and right wings for proper position and security as follows: (1) Remove inspection covers from bottom of wing and inspect the grommets on each fuel line (using light and mirror) to insure that they are correctly installed in the holes of the fuel line support plates. (2) Replace all lines that have been damaged by chafing wear with serviceable lines of the same part numbers or equivalent lines approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, Southern Region. (3) Correct installation of any grommet not properly installed. (4) If any of the grommets are not properly installed at a support plate that cannot be reached through the existing inspection hole, it will be necessary to cut additional access openings in bottom of wing as required, install cover plate grommet part number 85012-78 and inspection cover plate part number 12761-02 over any new opening in fabric and install existing inspection covers. Piper Service letter No. 721 Parts II and III, or other approved later revision, pertains to this same subject. This amendment becomes effective August 27, 1974. 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.
Related Airworthiness Directives
2015-08-04 Recurring
final ruleAirworthiness Directives; Various Aircraft Equipped With Wing Lift Struts
Unsafe Condition: Corrosion in wing lift struts and cracks in wing lift strut forks could lead to structural failure of the wing lift system.
2007-08-07
final ruleAirworthiness Directives; LATINOAMERICANA DE AVIACIÓN (LAVIA) S.A. (Type Certificate Data Sheets No. 2A8 and No. 2A10 Previously Held by The New Piper Aircraft, Inc.) Models PA-25, PA-25-235, and PA-25-260 Airplanes
Unsafe Condition: Severe corrosion and cracks in both rear and forward supports of the horizontal stabilizer, caused by the accumulation of steam or application products vapors.
2006-12-07
final ruleAirworthiness Directives; Engine Components Inc. (ECi) Reciprocating Engine Cylinder Assemblies
Unsafe Condition: Cracks in the cylinder assemblies and possible engine failure caused by separation of a cylinder head.
2001-23-17
final ruleAirworthiness Directives; GARMIN International GNS 430 Units
Unsafe Condition: could result in the pilot making flight decisions that put the aircraft in unsafe flight conditions.