AD 64-24-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | D & R Nevada LLC | 30 | Airworthiness Directives; GENERAL DYNAMICS Model 30 Series Aircraft |
| aircraft | D & R Nevada LLC | 30A | Airworthiness Directives; GENERAL DYNAMICS Model 30 Series Aircraft |
Unsafe Condition
Emergency electrical stabilizer trim system circuits altered under American Airlines Fleet Campaign Directive No. 194K or General Dynamics/Convair Service Bulletin No. 27-66 could permit a runaway stabilizer condition due to interlocked 'up relay' and 'down relay' coils.
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Required Actions
Modify the emergency electric stabilizer trim system circuits by either restoring to original Convair certification design or replacing the single pole switch with a double pole, double throw, momentary on switch as per Service Bulletin No. 27-66A or equivalent approved method.
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Compliance Time
within 300 hours' time in service following the effective date of this AD unless already accomplished
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Affected Aircraft
GENERAL DYNAMICS Model 30 Series Aircraft altered under American Airlines Fleet Campaign Directive No. 194K or General Dynamics/Convair Service Bulletin No. 27-66
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Federal Register Abstract
Emergency Electrical Trim System Circuits
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_64-24-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 64-24-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; GENERAL DYNAMICS Model 30 Series Aircraft Subject: Emergency Electrical Trim System Circuits Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/23/1964 Make: D & R Nevada LLC Model: 30 | 30A Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 64-24-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 64-24-03 SUBJECT HEADING: Airworthiness Directives; GENERAL DYNAMICS Model 30 Series Aircraft ACTION: SUMMARY: DATES: Effective October 23, 1964. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 64-24-03 GENERAL DYNAMICS: Amdt. 824 Part 507 Federal Register October 23, 1964. Applies to Model 30 Series Aircraft Which Have Been Altered in accordance with Either American Airlines Fleet Campaign Directive No. 194K or General Dynamics/Convair (990) Service Bulletin No. 27-66 Dated December 6, 1963. Compliance required within 300 hours' time in service following the effective date of this AD unless already accomplished. American Airlines Fleet Campaign Directive No. 194K and General Dynamics/Convair (990) Service Bulletin No. 27-66 describe emergency electric stabilizer trim system circuit change which interlock the "up relay" and "down relay" coils. Under certain circumstances the emergency electrical stabilizer trim systems which incorporate these circuit changes could permit a runaway stabilizer condition to exist. To correct this condition, modify the aircraft emergency electric stabilizer trim system circuits in accordance with either paragraph (a) or (b). The circuit changes described in General Dynamics/Convair Service Bulletin No. 27-66, which interlock the coils of the "up relay" and "down relay", may be used when the changes described in paragraph (b) are accomplished. (a) Restore the emergency electric stabilizer trim system circuits to the original Convair type certification design; or (b) Replace the single pole, double throw, emergency electric stabilizer control "nose up"-"nose down" switch (S-246), with a double pole, double throw, momentary on, center position off, momentary on switch. Connect the added poles of the switch so that the power control relay (K-276) is energized with the "up relay" (K-124) and with the "down relay" (K-123) but is not energized when the switch is in the "off" position. This modification shall be accomplished in accordance with General Dynamics/Convair (990) Service Bulletin No. 27-66A dated April 22, 1964, or by an equivalent approved by the Aircraft Engineering Division, FAA Western Region. This directive effective October 23, 1964. FOOTER:
Document Text
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AD Final Rules - DRS_64-24-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 64-24-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; GENERAL DYNAMICS Model 30 Series Aircraft Subject: Emergency Electrical Trim System Circuits Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 10/23/1964 Make: D & R Nevada LLC Model: 30 | 30A Product Type: Aircraft Product Subtype: Large 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: 64-24-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 64-24-03 SUBJECT HEADING: Airworthiness Directives; GENERAL DYNAMICS Model 30 Series Aircraft ACTION: SUMMARY: DATES: Effective October 23, 1964. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 64-24-03 GENERAL DYNAMICS: Amdt. 824 Part 507 Federal Register October 23, 1964. Applies to Model 30 Series Aircraft Which Have Been Altered in accordance with Either American Airlines Fleet Campaign Directive No. 194K or General Dynamics/Convair (990) Service Bulletin No. 27-66 Dated December 6, 1963. Compliance required within 300 hours' time in service following the effective date of this AD unless already accomplished. American Airlines Fleet Campaign Directive No. 194K and General Dynamics/Convair (990) Service Bulletin No. 27-66 describe emergency electric stabilizer trim system circuit change which interlock the "up relay" and "down relay" coils. Under certain circumstances the emergency electrical stabilizer trim systems which incorporate these circuit changes could permit a runaway stabilizer condition to exist. To correct this condition, modify the aircraft emergency electric stabilizer trim system circuits in accordance with either paragraph (a) or (b). The circuit changes described in General Dynamics/Convair Service Bulletin No. 27-66, which interlock the coils of the "up relay" and "down relay", may be used when the changes described in paragraph (b) are accomplished. (a) Restore the emergency electric stabilizer trim system circuits to the original Convair type certification design; or (b) Replace the single pole, double throw, emergency electric stabilizer control "nose up"-"nose down" switch (S-246), with a double pole, double throw, momentary on, center position off, momentary on switch. Connect the added poles of the switch so that the power control relay (K-276) is energized with the "up relay" (K-124) and with the "down relay" (K-123) but is not energized when the switch is in the "off" position. This modification shall be accomplished in accordance with General Dynamics/Convair (990) Service Bulletin No. 27-66A dated April 22, 1964, or by an equivalent approved by the Aircraft Engineering Division, FAA Western Region. This directive effective October 23, 1964. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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