AD 72-06-05 R2
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Marvel-Schebler Products Division | Carburetors | Airworthiness Directives; MARVEL SCHEBLER (Facet Aerospace Products Company): Applies to Models MA-3, MA-3A, MA3-PA, MA-3SPA, MA4-SPA, MA4-5, MA4-5AA, MA-5, MA-5AA, MA-6AA and HA-6 Carburetors |
| appliance | Marvel-Schebler Products Division | Carburetors | Airworthiness Directives; MARVEL SCHEBLER (Facet Aerospace Products Company): Applies to Models MA-3, MA-3A, MA3-PA, MA-3SPA, MA4-SPA, MA4-5, MA4-5AA, MA-5, MA-5AA, MA-6AA and HA-6 Carburetors |
Unsafe Condition
Looseness or separation of the throttle arm from the throttle stop due to improper positioning, clamping screw type, or insufficient torque leading to potential loss of engine control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect and reposition the throttle arm to ensure it is bottomed against the shoulder on the throttle stop and achieves full throttle travel. Replace throttle arms with milled flats with those having spotfaced flats and install specified clamping screws (Marvel Schebler P/N A15-493) torqued to 20-28 or 35-40 in.-lb as applicable. Safety wire the throttle arm and clamping screw to the throttle stop according to specified illustrations. Equivalent procedures from approved service letters or bulletins may be used.
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Compliance Time
within 30 days after the effective date of the AD
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Affected Aircraft
Marvel-Schebler carburetors Models MA-3, MA-3A, MA3-PA, MA-3SPA, MA4-SPA, MA4-5, MA4-5AA, MA-5, MA-5AA, MA-6AA, and HA-6 used on Franklin, Continental, Lycoming, or Ranger engines with one of Illustrations A, B, C, or D.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Carburetors
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_72-06-05_R.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 72-06-05 R2 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; MARVEL SCHEBLER (Facet Aerospace Products Company): Applies to Models MA...Show more Subject: Carburetors Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/03/1986 Make: Marvel-Schebler Products Division Model: Carburetors Product Type: Appliance Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 72-06-05 R2 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-5338 AD NUMBER: 72-06-05 R2 SUBJECT HEADING: Airworthiness Directives; MARVEL SCHEBLER (Facet Aerospace Products Company): Applies to Models MA-3, MA-3A, MA3-PA, MA-3SPA, MA4-SPA, MA4-5, MA4-5AA, MA-5, MA-5AA, MA-6AA and HA-6 Carburetors ACTION: SUMMARY: DATES: Effective July 3, 1986. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 72-06-05 R2 MARVEL SCHEBLER (Facet Aerospace Products Company): Amendment 39-1411 as amended by Amendment 39-1685 is further amended by Amendment 39-5338. Applies to Models MA-3, MA-3A, MA3-PA, MA-3SPA, MA4-SPA, MA4-5, MA4-5AA, MA-5, MA-5AA, MA-6AA and HA-6 carburetors used on various Franklin (Aircooled), Continental, Lycoming and Ranger engines, having one of Illustrations A, B, C, or D. Compliance is required within 30 days after the effective date of the AD, unless already accomplished. To present looseness or separation of the throttle arm, accomplish the following or any equivalent procedure approved by the Manager, New York Aircraft Certification Office, FAA, New England Region. (1) Inspect the throttle arm to verify that it is bottomed against the shoulder on the throttle stop and positioned so that full throttle travel is obtained, and if not, loosen clamping screw and reposition arm and/or re-rig control system in accordance with airplane manufacturers' maintenance instructions to obtain these conditions. (2) Inspect the throttle arm on Marvel Schebler MA-3, MA-3A, MA-3PA, MA3-SPA, and MA-4SPA carburetors to determine whether it has a spotfaced or milled flat for the head of the clamping screw. Replace any arm having a milled flat with one having a spotfaced flat. If not already installed, install a Marvel Schebler P/N A15-493 clamping screw (No. 10-24 x 5/8 slotted drilled fillister head) in the throttle arm. Torque the clamping screw to 20-28 in.-lb. and inspect the slot in the end of the arm for clearance. If the slot has closed so that no clearance remains, replace the arm and retorque to the above specifications. After the specified torque is established safety wire the throttle arm and clamping screw to the throttle stop as shown in Illustration A. (3) On Marvel Schebler MA-4-5, MA4-5AA, MA-5AA, MA-6AA, and HA-6 series carburetors with throttle arms having a 10-32 bolt and nut clamping the arm on the throttle stop, torque the nut to 35 to 40 in. lbs. and safety wire the throttle arm to the throttle stop as shown in Illustration B. On these series carburetors having a throttle arm threaded for a 10-24 screw, if not already installed, install a Marvel Schebler P/N A15-493 clamping screw (No. 10-24 x 5/8 slotted drilled fillister head) in the throttle arm and torque the screw to 20 to 28 in. lbs. Safety wire the throttle arm to the throttle stop as shown in Illustration C or D. NOTE: The procedures specified in American Aviation Corporation Service Letter No. 69-4, dated October 3, 1969, Cessna Service Letter SE71-17 revised February 25, 1972, and Lycoming Service Bulletin No. 330A, dated October 30, 1970, are approved as equivalent procedures to those prescribed in this AD for the applicable carburetors. Upon request, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, New York Aircraft Certification Office, Aircraft Certification Division, New England Region, 181 South Franklin Avenue, Room 202, Valley Stream, New York 11581. Amendment 39-1411 (AD 72-6-5) became effective March 24, 1972. Amendment 39-1685 became effective July 9, 1973. This Amendment 39-5338 becomes effective July 3, 1986. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_72-06-05_R.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 72-06-05 R2 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; MARVEL SCHEBLER (Facet Aerospace Products Company): Applies to Models MA...Show more Subject: Carburetors Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/03/1986 Make: Marvel-Schebler Products Division Model: Carburetors Product Type: Appliance Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 72-06-05 R2 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-5338 AD NUMBER: 72-06-05 R2 SUBJECT HEADING: Airworthiness Directives; MARVEL SCHEBLER (Facet Aerospace Products Company): Applies to Models MA-3, MA-3A, MA3-PA, MA-3SPA, MA4-SPA, MA4-5, MA4-5AA, MA-5, MA-5AA, MA-6AA and HA-6 Carburetors ACTION: SUMMARY: DATES: Effective July 3, 1986. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 72-06-05 R2 MARVEL SCHEBLER (Facet Aerospace Products Company): Amendment 39-1411 as amended by Amendment 39-1685 is further amended by Amendment 39-5338. Applies to Models MA-3, MA-3A, MA3-PA, MA-3SPA, MA4-SPA, MA4-5, MA4-5AA, MA-5, MA-5AA, MA-6AA and HA-6 carburetors used on various Franklin (Aircooled), Continental, Lycoming and Ranger engines, having one of Illustrations A, B, C, or D. Compliance is required within 30 days after the effective date of the AD, unless already accomplished. To present looseness or separation of the throttle arm, accomplish the following or any equivalent procedure approved by the Manager, New York Aircraft Certification Office, FAA, New England Region. (1) Inspect the throttle arm to verify that it is bottomed against the shoulder on the throttle stop and positioned so that full throttle travel is obtained, and if not, loosen clamping screw and reposition arm and/or re-rig control system in accordance with airplane manufacturers' maintenance instructions to obtain these conditions. (2) Inspect the throttle arm on Marvel Schebler MA-3, MA-3A, MA-3PA, MA3-SPA, and MA-4SPA carburetors to determine whether it has a spotfaced or milled flat for the head of the clamping screw. Replace any arm having a milled flat with one having a spotfaced flat. If not already installed, install a Marvel Schebler P/N A15-493 clamping screw (No. 10-24 x 5/8 slotted drilled fillister head) in the throttle arm. Torque the clamping screw to 20-28 in.-lb. and inspect the slot in the end of the arm for clearance. If the slot has closed so that no clearance remains, replace the arm and retorque to the above specifications. After the specified torque is established safety wire the throttle arm and clamping screw to the throttle stop as shown in Illustration A. (3) On Marvel Schebler MA-4-5, MA4-5AA, MA-5AA, MA-6AA, and HA-6 series carburetors with throttle arms having a 10-32 bolt and nut clamping the arm on the throttle stop, torque the nut to 35 to 40 in. lbs. and safety wire the throttle arm to the throttle stop as shown in Illustration B. On these series carburetors having a throttle arm threaded for a 10-24 screw, if not already installed, install a Marvel Schebler P/N A15-493 clamping screw (No. 10-24 x 5/8 slotted drilled fillister head) in the throttle arm and torque the screw to 20 to 28 in. lbs. Safety wire the throttle arm to the throttle stop as shown in Illustration C or D. NOTE: The procedures specified in American Aviation Corporation Service Letter No. 69-4, dated October 3, 1969, Cessna Service Letter SE71-17 revised February 25, 1972, and Lycoming Service Bulletin No. 330A, dated October 30, 1970, are approved as equivalent procedures to those prescribed in this AD for the applicable carburetors. Upon request, an equivalent means of compliance with the requirements of this AD may be approved by the Manager, New York Aircraft Certification Office, Aircraft Certification Division, New England Region, 181 South Franklin Avenue, Room 202, Valley Stream, New York 11581. Amendment 39-1411 (AD 72-6-5) became effective March 24, 1972. Amendment 39-1685 became effective July 9, 1973. This Amendment 39-5338 becomes effective July 3, 1986. FOOTER:
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Retrieved: Apr 8, 2026
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