AD 77-07-04
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | True Flight Holdings LLC | AA-5 | Airworthiness Directives; Grumman American Aviation Corporation Model AA-5 and AA-5A Airplanes |
| aircraft | True Flight Holdings LLC | AA-5A | Airworthiness Directives; Grumman American Aviation Corporation Model AA-5 and AA-5A Airplanes |
Unsafe Condition
Failure of the carburetor heat valve assembly due to cracks in the bend radius of Configuration A.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the carburetor heat valve assembly within 10 flight hours after the effective date. If Configuration A is installed, inspect for cracks; replace with Part Number 5503006-505 if cracks are found. Reinspect after 25 hours of operation and again after 50 total hours. Perform carburetor heat rise checks including gap measurements and engine run-up as specified.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 10 hours of flight after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Grumman American Aviation Corporation Model AA-5, Serial Numbers 0641 through 0834, and Model AA-5A, Serial Numbers 0001 through 0321
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Carburetor Heat Valve Assembly
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_77-07-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 77-07-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Grumman American Aviation Corporation Model AA-5 and AA-5A Airplanes Subject: Carburetor Heat Valve Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/11/1977 Make: True Flight Holdings LLC Model: AA-5 | AA-5A Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 77-07-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2861 AD NUMBER: 77-07-04 SUBJECT HEADING: Airworthiness Directives; Grumman American Aviation Corporation Model AA-5 and AA-5A Airplanes ACTION: SUMMARY: DATES: Effective April 11, 1977. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 77-07-04 GRUMMAN AMERICAN AVIATION CORPORATION: Amendment 39- 2861. Applies to GAAC Model AA-5, Serial Numbers 0641 through 0834, and to Model AA-5A, Serial Numbers 0001 through 0321, airplanes certificated in all categories. Compliance required as indicated below after the effective date of this AD unless already accomplished. (a) Within 10 hours of flight after the effective date of this AD, in order to prevent possible failure of the carburetor heat valve assembly, remove the lower cowl and inspect the carburetor heat valve assembly for configuration as shown in Figure 1. (1) If Configuration B is installed, reinstall lower cowl, and the aircraft may be approved for return to service. (2) If Configuration A is installed, remove the carburetor heat valve assembly and inspect for cracks in the bend radius. If cracks are found, remove valve assembly from service and replace with a new valve assembly Part Number 5503006-505. Do not reuse the removed carburetor heat valve assembly which must be discarded. (b) If no cracks are found in Configuration A carburetor heat valve assembly, valve assembly may be reinstalled, the lower cowl reinstalled, and after compliance with (c) below, the aircraft may be approved for return to service for twenty-five (25) hours of operation. (1) At the end of the first period not to exceed twenty-five hours of operation after the initial inspection required in (a)(2), repeat the initial inspection procedure required in (a)(2). (2) If no cracks are found at this second inspection of the carburetor heat valve assembly, the valve assembly may be reinstalled, the cowl replaced, and after compliance with (c) below, the aircraft may be approved for return to service for a second and final operational period not to exceed 25 hours. (3) No Configuration A carburetor heat valve assembly may be continued in service in excess of 50 hours after the initial inspection required in (a)(2) above. (c) To insure adequate carburetor heat rise, after the removal and reinstallation of the carburetor heat valve assembly, the following checks must be made prior to flight: (1) After carburetor heat valve assembly is installed into air box assembly, temporarily install air box assembly onto lower cowl. Remove air filter and check forward and aft gap between the valve assembly and carburetor heat box/lower cowl contact points. Maximum gap is 0.120 inches at both ends of valve with carburetor heat in the on and off position. If excessive gap exists, remove air box assembly and crimp edge of valve assembly up or down as required to obtain a gap less than 0.120 inch as specified in the GAAC Service Bulletin No. 159. (2) Following cowl installation, perform engine run up to check carburetor heat drop (50 RPM drop minimum). If drop does not meet minimum requirements, rework valve per subparagraph (c)(1) above. (3) Carburetor heat rigging to be accomplished in accordance with the AA-5 series Service Manual. Grumman American Aviation Corporation Service Bulletin No. 159 dated February 25, 1977, or later approved revisions, pertains to this subject. Equivalent methods of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southern Region, 3400 Whipple Street, East Point, Georgia 30344. This amendment becomes effective April 11, 1977. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_77-07-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 77-07-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Grumman American Aviation Corporation Model AA-5 and AA-5A Airplanes Subject: Carburetor Heat Valve Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/11/1977 Make: True Flight Holdings LLC Model: AA-5 | AA-5A 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: 77-07-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2861 AD NUMBER: 77-07-04 SUBJECT HEADING: Airworthiness Directives; Grumman American Aviation Corporation Model AA-5 and AA-5A Airplanes ACTION: SUMMARY: DATES: Effective April 11, 1977. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 77-07-04 GRUMMAN AMERICAN AVIATION CORPORATION: Amendment 39- 2861. Applies to GAAC Model AA-5, Serial Numbers 0641 through 0834, and to Model AA-5A, Serial Numbers 0001 through 0321, airplanes certificated in all categories. Compliance required as indicated below after the effective date of this AD unless already accomplished. (a) Within 10 hours of flight after the effective date of this AD, in order to prevent possible failure of the carburetor heat valve assembly, remove the lower cowl and inspect the carburetor heat valve assembly for configuration as shown in Figure 1. (1) If Configuration B is installed, reinstall lower cowl, and the aircraft may be approved for return to service. (2) If Configuration A is installed, remove the carburetor heat valve assembly and inspect for cracks in the bend radius. If cracks are found, remove valve assembly from service and replace with a new valve assembly Part Number 5503006-505. Do not reuse the removed carburetor heat valve assembly which must be discarded. (b) If no cracks are found in Configuration A carburetor heat valve assembly, valve assembly may be reinstalled, the lower cowl reinstalled, and after compliance with (c) below, the aircraft may be approved for return to service for twenty-five (25) hours of operation. (1) At the end of the first period not to exceed twenty-five hours of operation after the initial inspection required in (a)(2), repeat the initial inspection procedure required in (a)(2). (2) If no cracks are found at this second inspection of the carburetor heat valve assembly, the valve assembly may be reinstalled, the cowl replaced, and after compliance with (c) below, the aircraft may be approved for return to service for a second and final operational period not to exceed 25 hours. (3) No Configuration A carburetor heat valve assembly may be continued in service in excess of 50 hours after the initial inspection required in (a)(2) above. (c) To insure adequate carburetor heat rise, after the removal and reinstallation of the carburetor heat valve assembly, the following checks must be made prior to flight: (1) After carburetor heat valve assembly is installed into air box assembly, temporarily install air box assembly onto lower cowl. Remove air filter and check forward and aft gap between the valve assembly and carburetor heat box/lower cowl contact points. Maximum gap is 0.120 inches at both ends of valve with carburetor heat in the on and off position. If excessive gap exists, remove air box assembly and crimp edge of valve assembly up or down as required to obtain a gap less than 0.120 inch as specified in the GAAC Service Bulletin No. 159. (2) Following cowl installation, perform engine run up to check carburetor heat drop (50 RPM drop minimum). If drop does not meet minimum requirements, rework valve per subparagraph (c)(1) above. (3) Carburetor heat rigging to be accomplished in accordance with the AA-5 series Service Manual. Grumman American Aviation Corporation Service Bulletin No. 159 dated February 25, 1977, or later approved revisions, pertains to this subject. Equivalent methods of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southern Region, 3400 Whipple Street, East Point, Georgia 30344. This amendment becomes effective April 11, 1977. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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