AD 71-17-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Maule Aerospace Technology, Inc. | M-4-180C | Airworthiness Directives; Maule Model M-4-180 and M-4-220 |
| aircraft | Maule Aerospace Technology, Inc. | M-4-220C | Airworthiness Directives; Maule Model M-4-180 and M-4-220 |
Unsafe Condition
Fuel line blockage due to low spots and inadequate firewall fire protection from an aluminum fuel feed line firewall bulkhead fitting.
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Required Actions
Inspect and remove low spots in the fuel line under the front seats by hand bending and resecuring with clamps or ty-raps. Ensure the fuel line slopes downward from right to left when in three-point position. Inspect and replace aluminum firewall bulkhead fittings with AN832-6 steel fittings.
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Compliance Time
within the next 50 hours' time in service after the effective date of this airworthiness directive
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Affected Aircraft
Maule Model M-4-180 serial numbers 3001C through 3005C and Model M-4-220 serial numbers 2001C through 2070C
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Federal Register Abstract
Fuel Line Blockage
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_71-17-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 71-17-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Maule Model M-4-180 and M-4-220 Subject: Fuel Line Blockage Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 08/16/1971 Make: Maule Aerospace Technology, Inc. Model: M-4-180C | M-4-220C Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 71-17-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1261 AD NUMBER: 71-17-01 SUBJECT HEADING: Airworthiness Directives; Maule Model M-4-180 and M-4-220 ACTION: SUMMARY: DATES: Effective August 16, 1971. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 71-17-01 MAULE AIRCRAFT: Amendment 39-1261. Applies to Model M-4-180 serial numbers 3001 C through 3005C and Model M-4-220 serial numbers 2001C through 2070C, certificated in all categories. Compliance required within the next 50 hours' time in service after the effective date of this airworthiness directive. To prevent fuel line blockage due to low spots and to maintain the firewall fire protection, accomplish the following: (1) Inspect the fuel line located underneath the front seats for low undrainable spots. If low spots are found, remove low spots by hand bending and resecure fuel line with additional clamps or ty-raps. With the aircraft in a three point position, this fuel line must have a downward slope from the right side to the left side of the aircraft. (2) Inspect fuel feed line firewall bulkhead fitting located on the left side of the firewall and ascertain that it is a steel AN832-6 fitting. If the fitting is aluminum, replace it with an AN832-6 steel fitting. Maule Service Letter 23 covers the above inspections and changes. This amendment becomes effective August 16, 1971. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_71-17-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 71-17-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Maule Model M-4-180 and M-4-220 Subject: Fuel Line Blockage Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 08/16/1971 Make: Maule Aerospace Technology, Inc. Model: M-4-180C | M-4-220C 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: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 71-17-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1261 AD NUMBER: 71-17-01 SUBJECT HEADING: Airworthiness Directives; Maule Model M-4-180 and M-4-220 ACTION: SUMMARY: DATES: Effective August 16, 1971. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 71-17-01 MAULE AIRCRAFT: Amendment 39-1261. Applies to Model M-4-180 serial numbers 3001 C through 3005C and Model M-4-220 serial numbers 2001C through 2070C, certificated in all categories. Compliance required within the next 50 hours' time in service after the effective date of this airworthiness directive. To prevent fuel line blockage due to low spots and to maintain the firewall fire protection, accomplish the following: (1) Inspect the fuel line located underneath the front seats for low undrainable spots. If low spots are found, remove low spots by hand bending and resecure fuel line with additional clamps or ty-raps. With the aircraft in a three point position, this fuel line must have a downward slope from the right side to the left side of the aircraft. (2) Inspect fuel feed line firewall bulkhead fitting located on the left side of the firewall and ascertain that it is a steel AN832-6 fitting. If the fitting is aluminum, replace it with an AN832-6 steel fitting. Maule Service Letter 23 covers the above inspections and changes. This amendment becomes effective August 16, 1971. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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