AD 64-07-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 1049-54 | LOCKHEED Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049C-55 | LOCKHEED Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049D-55 | LOCKHEED Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049E-55 | LOCKHEED Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049G-82 | LOCKHEED Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049H-82 | LOCKHEED Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 149-46 | LOCKHEED Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 649-79 | LOCKHEED Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 649A-79 | LOCKHEED Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 749-79 | LOCKHEED Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 749A-79 | LOCKHEED Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft |
Unsafe Condition
Loose or unsafetied bolts in the parallelogram linkages of the primary flight control boost systems could result in loss of flight control system integrity.
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Required Actions
Replace five castellated nuts in each of the four parallelogram linkages with self-locking castellated nuts (MS-17825(WEP) or MS-17826(WEP)) and cotter pins within 400 hours' time in service after the effective date. Ensure torque requirements for AN 310/320 nuts are maintained. Replace self-locking nuts before exceeding manufacturer's reusability limits.
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Compliance Time
within 400 hours' time in service after the effective date of this AD
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Affected Aircraft
Lockheed Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G, and 1049H Series Aircraft
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Federal Register Abstract
Flight Control Boost Systems
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_64-07-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 64-07-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft Subject: Flight Control Boost Systems Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/14/1964 Make: Lockheed Aircraft Corporation Model: 1049-54 | 1049C-55 | 1049D-55 | 1049E-55 | 1049G-82 | 1049H-82 | 149-46 | 49-46 | 649-79 | 649A-79 |...Show more 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: 64-07-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 64-07-04 SUBJECT HEADING: LOCKHEED Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft ACTION: SUMMARY: DATES: Effective April 14, 1964. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 64-07-04 LOCKHEED: Amdt. 705 Part 507 Federal Register March 14, 1964. Applies to All Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft. Compliance required as indicated. (a) To insure that the bolts in the parallelogram linkages of the primary flight control boost systems remain secured and safetied, accomplish the following within 400 hours' time in service after the effective date of this AD, unless previously accomplished. (1) Replace the five castellated nuts in each of the four parallelogram linkages between the boost valve and boost mechanism of each of the boost systems with self-locking castellated nuts and cotter pins using MS-17825(WEP) in lieu of AN 310 nuts and MS- 17826(WEP) in lieu of AN 320 nuts or an equivalent approved by the Chief, Engineering and Manufacturing Branch, FAA Western Region. (2) All torque requirements that applied to the AN 310 and 320 castellated nuts also apply to the MS-17825(WEP) and MS-17826(WEP) self-locking castellated nuts, respectively. (b) Replace the self-locking castellated nuts with new self-locking castellated nuts prior to exceeding the reusability limits specified by the nut manufacturer. (Lockheed Service Information Letter 514, dated November 27, 1963, covers this same subject.) This directive effective April 14, 1964. FOOTER:
Document Text
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AD Final Rules - DRS_64-07-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 64-07-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft Subject: Flight Control Boost Systems Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/14/1964 Make: Lockheed Aircraft Corporation Model: 1049-54 | 1049C-55 | 1049D-55 | 1049E-55 | 1049G-82 | 1049H-82 | 149-46 | 49-46 | 649-79 | 649A-79 |...Show more 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: 64-07-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 64-07-04 SUBJECT HEADING: LOCKHEED Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft ACTION: SUMMARY: DATES: Effective April 14, 1964. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 64-07-04 LOCKHEED: Amdt. 705 Part 507 Federal Register March 14, 1964. Applies to All Models 49, 149, 649, 649A, 749, 749A, 1049-54, 1049C, 1049D, 1049E, 1049G and 1049H Series Aircraft. Compliance required as indicated. (a) To insure that the bolts in the parallelogram linkages of the primary flight control boost systems remain secured and safetied, accomplish the following within 400 hours' time in service after the effective date of this AD, unless previously accomplished. (1) Replace the five castellated nuts in each of the four parallelogram linkages between the boost valve and boost mechanism of each of the boost systems with self-locking castellated nuts and cotter pins using MS-17825(WEP) in lieu of AN 310 nuts and MS- 17826(WEP) in lieu of AN 320 nuts or an equivalent approved by the Chief, Engineering and Manufacturing Branch, FAA Western Region. (2) All torque requirements that applied to the AN 310 and 320 castellated nuts also apply to the MS-17825(WEP) and MS-17826(WEP) self-locking castellated nuts, respectively. (b) Replace the self-locking castellated nuts with new self-locking castellated nuts prior to exceeding the reusability limits specified by the nut manufacturer. (Lockheed Service Information Letter 514, dated November 27, 1963, covers this same subject.) This directive effective April 14, 1964. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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