AD 75-16-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Piper Aircraft Inc. | PA-28-151 | Airworthiness Directives; Piper Model PA-28-151 Airplanes |
Unsafe Condition
Over-travel of the carburetor air box valve could occur, leading to potential failure of the carburetor heat system.
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Required Actions
Inspect and modify the carburetor air box by installing two plates (Piper P/N 35646002) secured with rivets, replacing the gasket (Piper P/N 73451-07), reinstalling components with specified hardware, and ensuring proper cable tension. Follow Piper Service Bulletin 474 or an approved alternative method.
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Compliance Time
within the next 50 hours' time in service or at the next scheduled inspection, whichever occurs first, after the effective date of this AD
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Affected Aircraft
Piper Model PA-28-151 airplanes, serial numbers 28-7415001 through 28-7515425
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Federal Register Abstract
Carburetor Air Box Valve
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_75-16-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 75-16-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Piper Model PA-28-151 Airplanes Subject: Carburetor Air Box Valve Status: Current Citation: This information is not available. Citation Publish Date: 07/28/1975 Effective Date: 07/30/1975 Make: Piper Aircraft Inc. Model: PA-28-151 Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: AIR-700: Compliance & Airworthiness Division Office of Primary Responsibility: AIR-720: Operational Safety Branch CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 75-16-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2272 AD NUMBER: 75-16-04 SUBJECT HEADING: Airworthiness Directives; Piper Model PA-28-151 Airplanes ACTION: SUMMARY: DATES: Effective July 30, 1975. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 75-16-04 PIPER AIRCRAFT CORPORATION: Amendment 39-2272. Applies to PA-28-151 airplanes serial numbers 28-7415001 through 28-7515425; certificated in all categories. Compliance required within the next 50 hours' time in service or at the next scheduled inspection, whichever occurs first, after the effective date of this AD, unless already accomplished. To prevent over-travel of the carburetor air box valve, accomplish the following or accomplish an alternate modification method approved by the Chief, Engineering and Manufacturing Branch, Southern Region. (1) Remove lower nose cowl and metal bottom panel for access to the carburetor air box. (2) Loosen clamps attaching carburetor heat and induction air hoses to air box. Remove hoses from air box. (3) Remove control cable from bracket and lever on air box. Retain all hardware except cotter pin for reinstallation. (4) Remove air box bottom and valve by removing (12) #6 screws, nuts, and washers around the bottom of the air box. Retain the air box bottom and valve and attaching hardware for reinstallation. (5) Remove safety wire securing (4) MS20074-04-04 bolts which mount air box to carburetor. Remove the bolts and AN936A416 washers. Remove air box from carburetor. Remove and discard old 73451-07 gasket, but retain mounting hardware for reinstallation. (6) Install (2) plates, Piper Part Number 35646002, to top stiffener, secured with 8 (4 each plate) MS28470AL3-4 (Piper P/N 420-201) rivets. Installation must prevent valve over- travel. (7) Install new gasket Piper P/N 73451-07, and reworked air box on carburetor using (4) MS20874-04-04 bolts and AN936A416 washers. Safety wire bolts. (8) Reinstall bottom and valve assembly to air box using (12) #6 screws, nuts, and washers previously removed. Insure lever on valve is on the same side of box as control cable bracket. (9) Reinstall control cable. Tighten the swivel fitting nut to draw the core wire into the recess 1/2 its diameter. (10) Reinstall carburetor heat and induction air hoses on air box and secure with clamps. (11) Replace cowling and metal bottom panel. Piper Service Bulletin 474 also pertains to this same subject. This amendment becomes effective July 30, 1975. FOOTER:
Document Text
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AD Final Rules - DRS_75-16-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 75-16-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Piper Model PA-28-151 Airplanes Subject: Carburetor Air Box Valve Status: Current Citation: This information is not available. Citation Publish Date: 07/28/1975 Effective Date: 07/30/1975 Make: Piper Aircraft Inc. Model: PA-28-151 Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: AIR-700: Compliance & Airworthiness Division Office of Primary Responsibility: AIR-720: Operational Safety Branch CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 75-16-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2272 AD NUMBER: 75-16-04 SUBJECT HEADING: Airworthiness Directives; Piper Model PA-28-151 Airplanes ACTION: SUMMARY: DATES: Effective July 30, 1975. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 75-16-04 PIPER AIRCRAFT CORPORATION: Amendment 39-2272. Applies to PA-28-151 airplanes serial numbers 28-7415001 through 28-7515425; certificated in all categories. Compliance required within the next 50 hours' time in service or at the next scheduled inspection, whichever occurs first, after the effective date of this AD, unless already accomplished. To prevent over-travel of the carburetor air box valve, accomplish the following or accomplish an alternate modification method approved by the Chief, Engineering and Manufacturing Branch, Southern Region. (1) Remove lower nose cowl and metal bottom panel for access to the carburetor air box. (2) Loosen clamps attaching carburetor heat and induction air hoses to air box. Remove hoses from air box. (3) Remove control cable from bracket and lever on air box. Retain all hardware except cotter pin for reinstallation. (4) Remove air box bottom and valve by removing (12) #6 screws, nuts, and washers around the bottom of the air box. Retain the air box bottom and valve and attaching hardware for reinstallation. (5) Remove safety wire securing (4) MS20074-04-04 bolts which mount air box to carburetor. Remove the bolts and AN936A416 washers. Remove air box from carburetor. Remove and discard old 73451-07 gasket, but retain mounting hardware for reinstallation. (6) Install (2) plates, Piper Part Number 35646002, to top stiffener, secured with 8 (4 each plate) MS28470AL3-4 (Piper P/N 420-201) rivets. Installation must prevent valve over- travel. (7) Install new gasket Piper P/N 73451-07, and reworked air box on carburetor using (4) MS20874-04-04 bolts and AN936A416 washers. Safety wire bolts. (8) Reinstall bottom and valve assembly to air box using (12) #6 screws, nuts, and washers previously removed. Insure lever on valve is on the same side of box as control cable bracket. (9) Reinstall control cable. Tighten the swivel fitting nut to draw the core wire into the recess 1/2 its diameter. (10) Reinstall carburetor heat and induction air hoses on air box and secure with clamps. (11) Replace cowling and metal bottom panel. Piper Service Bulletin 474 also pertains to this same subject. This amendment becomes effective July 30, 1975. 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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