AD 75-04-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | American Champion Aircraft Corp. | 8GCBC | Airworthiness Directives; Bellanca Model 8GCBC Airplanes |
Unsafe Condition
Resonant vibratory conditions with McCauley Model 1A200/HFA fixed pitch propellers installed on Lycoming O-360-C2A or -C2E type engines.
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Required Actions
Remove existing tachometer markings, affix Mylar decal Bellanca P/N 1-10443 with specified RPM arcs and red radial, install placard Bellanca P/N 1-10437 below the hour meter, and revise the Airplane Flight Manual per Revision Number 1.
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Compliance Time
within the next 10 hours time in service after the effective date of this airworthiness directive
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Affected Aircraft
Bellanca Model 8GCBC Airplanes, Serial Numbers 1-74 through 119-74, 120-75 through 153-75 certificated in all categories.
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Federal Register Abstract
Markings on Tachometer
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_75-04-12.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 75-04-12 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bellanca Model 8GCBC Airplanes Subject: Markings on Tachometer Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 02/21/1975 Make: American Champion Aircraft Corp. Model: 8GCBC Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 75-04-12 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2093 AD NUMBER: 75-04-12 SUBJECT HEADING: Airworthiness Directives; Bellanca Model 8GCBC Airplanes ACTION: SUMMARY: DATES: Effective February 21, 1975. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 75-04-12 BELLANCA: Amendment 39-2093. Applies to Model 8GCBC Airplanes, Serial Numbers 1-74 through 119-74, 120-75 through 153-75 certificated in all categories. Compliance required within the next 10 hours time in service after the effective date of this airworthiness directive, unless already accomplished. To prevent possible resonant vibratory conditions with McCauley Model 1A200/HFA fixed pitch propellers installed on Lycoming 0-360-C2A, or -C2E type engines, accomplish the following in accordance with Bellanca Service Letter Number 115 and Bellanca Service Kit Number 245. (a) Remove existing markings on the tachometer instrument glass and affix Mylar decal, Bellanca P/N 1-10443. The decal is properly affixed when: a green arc extends from 500 to 1700 RPM; a yellow arc from 1700 to 2100 RPM; a green arc from 2100 RPM to 2700 RPM; and a red radial is positioned at 2700 RPM. (b) Install Bellanca P/N 1-10437, placard "AVOID 1700-2100 DURING DESCENT", on the tachometer instrument glass below the hour meter. (c) Accomplish Revision Number 1 to existing FAA Approved Airplane Flight Manual (AFM) in accordance with AFM revisions page. This amendment becomes effective February 21, 1975. FOOTER:
Document Text
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AD Final Rules - DRS_75-04-12.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 75-04-12 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bellanca Model 8GCBC Airplanes Subject: Markings on Tachometer Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 02/21/1975 Make: American Champion Aircraft Corp. Model: 8GCBC 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: 75-04-12 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2093 AD NUMBER: 75-04-12 SUBJECT HEADING: Airworthiness Directives; Bellanca Model 8GCBC Airplanes ACTION: SUMMARY: DATES: Effective February 21, 1975. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 75-04-12 BELLANCA: Amendment 39-2093. Applies to Model 8GCBC Airplanes, Serial Numbers 1-74 through 119-74, 120-75 through 153-75 certificated in all categories. Compliance required within the next 10 hours time in service after the effective date of this airworthiness directive, unless already accomplished. To prevent possible resonant vibratory conditions with McCauley Model 1A200/HFA fixed pitch propellers installed on Lycoming 0-360-C2A, or -C2E type engines, accomplish the following in accordance with Bellanca Service Letter Number 115 and Bellanca Service Kit Number 245. (a) Remove existing markings on the tachometer instrument glass and affix Mylar decal, Bellanca P/N 1-10443. The decal is properly affixed when: a green arc extends from 500 to 1700 RPM; a yellow arc from 1700 to 2100 RPM; a green arc from 2100 RPM to 2700 RPM; and a red radial is positioned at 2700 RPM. (b) Install Bellanca P/N 1-10437, placard "AVOID 1700-2100 DURING DESCENT", on the tachometer instrument glass below the hour meter. (c) Accomplish Revision Number 1 to existing FAA Approved Airplane Flight Manual (AFM) in accordance with AFM revisions page. This amendment becomes effective February 21, 1975. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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