AD 76-07-09
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Collins | Radio Magnetic Indicator | Airworthiness Directives; COLLINS: Applies to Collins Model 332C-10 Radio Magnetic Indicator |
| appliance | Collins | Radio Magnetic Indicator | Airworthiness Directives; COLLINS: Applies to Collins Model 332C-10 Radio Magnetic Indicator |
Unsafe Condition
Possible erroneous VOR bearing information presentation with no flag warning when 26 VAC input power is lost.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Determine installation and modification status within 50 hours time in service after the AD's effective date. Install a placard reading 'USE ADF MODE ONLY' on unmodified units before further flight. Modify units per Service Bulletin No. 6 by January 1, 1977.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 hours time in service after the effective date of this AD, and on or before January 1, 1977.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Collins Model 332C-10 Radio Magnetic Indicator with part numbers 622-0555-001 through 622-0555-008 and specific serial number ranges as listed in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Radio Magnetic Indicator
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_76-07-09.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 76-07-09 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; COLLINS: Applies to Collins Model 332C-10 Radio Magnetic Indicator Subject: Radio Magnetic Indicator Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/19/1976 Make: Collins Model: Radio Magnetic Indicator Product Type: Appliance Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 76-07-09 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2570 AD NUMBER: 76-07-09 SUBJECT HEADING: Airworthiness Directives; COLLINS: Applies to Collins Model 332C-10 Radio Magnetic Indicator ACTION: SUMMARY: DATES: Effective April 19, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 76-07-09 COLLINS: Amendment 39-2570. Applies to Collins Model 332C-10 Radio Magnetic Indicator (part numbers and serial numbers listed below) installed on various aircraft makes and models equipped with 24 V electrical systems: Collins Part No. Serial No. 622-0555-001 729 and below 622-0555-002 963 and below 622-0555-003 3593 and below, 3595 thru 3600, 3602 thru 3611, 3613 thru 3628 622-0555-004 3693 and below, 3695 thru 3706 622-0555-005 3252 and below 622-0555-006 4156 and below 622-0555-007 3208 and below, 3210 thru 3231, 3233 thru 3239 622-0555-008 2805 and below Compliance: Required as indicated, unless already accomplished. To preclude possible erroneous VOR bearing information presentation, with no flag warning, when 26 VAC input power is lost, accomplish the following: A) Within 50 hours" time in service in service after the effective date of this AD, determine if the 332C-10 Radio Magnetic Indicator(s) is (are) installed, and if so, whether modified in accordance with Collins 332C-10 Radio Magnetic Indicator (622-0555-XXX) Service Bulletin No. 6, dated February 16, 1976, or later approved revision. On those units not modified in accordance with Service Bulletin No. 6, prior to further flight, install a placard on glass face of the magnetic indicator which reads: "USE ADF MODE ONLY" and operate the unit in accordance with this limitation. NOTE: Indicators which have been modified in accordance with Service Bulletin No. 6 will have the No. 6 removed from the modification plate attached to the unit. B) On or before January 1, 1977, modify the 332C-10 indicators(s) in accordance with Collins 332C-10 Radio Magnetic Indicator (622-0555-XXX) Service Bulletin No. 6, dated February 16, 1976, or later approved revisions. C) When Paragraph B has been accomplished, compliance with Paragraph A is no longer required. D) Any alternate method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. This amendment becomes effective April 19, 1976. FOOTER:
Document Text
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AD Final Rules - DRS_76-07-09.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 76-07-09 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; COLLINS: Applies to Collins Model 332C-10 Radio Magnetic Indicator Subject: Radio Magnetic Indicator Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/19/1976 Make: Collins Model: Radio Magnetic Indicator 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: 76-07-09 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2570 AD NUMBER: 76-07-09 SUBJECT HEADING: Airworthiness Directives; COLLINS: Applies to Collins Model 332C-10 Radio Magnetic Indicator ACTION: SUMMARY: DATES: Effective April 19, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 76-07-09 COLLINS: Amendment 39-2570. Applies to Collins Model 332C-10 Radio Magnetic Indicator (part numbers and serial numbers listed below) installed on various aircraft makes and models equipped with 24 V electrical systems: Collins Part No. Serial No. 622-0555-001 729 and below 622-0555-002 963 and below 622-0555-003 3593 and below, 3595 thru 3600, 3602 thru 3611, 3613 thru 3628 622-0555-004 3693 and below, 3695 thru 3706 622-0555-005 3252 and below 622-0555-006 4156 and below 622-0555-007 3208 and below, 3210 thru 3231, 3233 thru 3239 622-0555-008 2805 and below Compliance: Required as indicated, unless already accomplished. To preclude possible erroneous VOR bearing information presentation, with no flag warning, when 26 VAC input power is lost, accomplish the following: A) Within 50 hours" time in service in service after the effective date of this AD, determine if the 332C-10 Radio Magnetic Indicator(s) is (are) installed, and if so, whether modified in accordance with Collins 332C-10 Radio Magnetic Indicator (622-0555-XXX) Service Bulletin No. 6, dated February 16, 1976, or later approved revision. On those units not modified in accordance with Service Bulletin No. 6, prior to further flight, install a placard on glass face of the magnetic indicator which reads: "USE ADF MODE ONLY" and operate the unit in accordance with this limitation. NOTE: Indicators which have been modified in accordance with Service Bulletin No. 6 will have the No. 6 removed from the modification plate attached to the unit. B) On or before January 1, 1977, modify the 332C-10 indicators(s) in accordance with Collins 332C-10 Radio Magnetic Indicator (622-0555-XXX) Service Bulletin No. 6, dated February 16, 1976, or later approved revisions. C) When Paragraph B has been accomplished, compliance with Paragraph A is no longer required. D) Any alternate method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region. This amendment becomes effective April 19, 1976. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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