AD 56-16-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 1049-54 | LOCKHEED All Models 49, 149, 649, 749, and 1049 Series |
| aircraft | Lockheed Aircraft Corporation | 1049B-55 (Navy R7V-1) | LOCKHEED All Models 49, 149, 649, 749, and 1049 Series |
| aircraft | Lockheed Aircraft Corporation | 1049C-55 | LOCKHEED All Models 49, 149, 649, 749, and 1049 Series |
| aircraft | Lockheed Aircraft Corporation | 1049D-55 | LOCKHEED All Models 49, 149, 649, 749, and 1049 Series |
| aircraft | Lockheed Aircraft Corporation | 1049E-55 | LOCKHEED All Models 49, 149, 649, 749, and 1049 Series |
| aircraft | Lockheed Aircraft Corporation | 1049F-55 (USAF C-121C) | LOCKHEED All Models 49, 149, 649, 749, and 1049 Series |
| aircraft | Lockheed Aircraft Corporation | 1049G-82 | LOCKHEED All Models 49, 149, 649, 749, and 1049 Series |
| aircraft | Lockheed Aircraft Corporation | 1049H-82 | LOCKHEED All Models 49, 149, 649, 749, and 1049 Series |
| aircraft | Lockheed Aircraft Corporation | 149-46 | LOCKHEED All Models 49, 149, 649, 749, and 1049 Series |
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED All Models 49, 149, 649, 749, and 1049 Series |
| aircraft | Lockheed Aircraft Corporation | 649-79 | LOCKHEED All Models 49, 149, 649, 749, and 1049 Series |
| aircraft | Lockheed Aircraft Corporation | 649A-79 | LOCKHEED All Models 49, 149, 649, 749, and 1049 Series |
| aircraft | Lockheed Aircraft Corporation | 749-79 | LOCKHEED All Models 49, 149, 649, 749, and 1049 Series |
| aircraft | Lockheed Aircraft Corporation | 749A-79 | LOCKHEED All Models 49, 149, 649, 749, and 1049 Series |
Unsafe Condition
Fatigue failures in the side webs of the Bendix Eclipse-Pioneer Type DQ-15 Series servo disconnect mounting brackets in the primary flight control system could disable the flight control system.
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Required Actions
Inspect rudder and elevator servo disconnect mounting brackets by dye penetrant or equivalent method every 125 hours until item 2 is done. Discard defective brackets. Install secondary servo support brackets as soon as possible but not exceeding next overhaul period after parts are available.
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Compliance Time
At 125-hour intervals until item 2 is accomplished. Item 2 must be done as soon as possible but not to exceed next overhaul period after parts become available.
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Affected Aircraft
Lockheed Aircraft Corporation models 49, 149, 649, 749, and 1049 Series equipped with Bendix Eclipse-Pioneer Type PB-10 Series automatic pilot installations.
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Federal Register Abstract
Automatic Pilot Servo Brackets
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_56-16-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 56-16-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED All Models 49, 149, 649, 749, and 1049 Series Subject: Automatic Pilot Servo Brackets Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 1049-54 | 1049B-55 (Navy R7V-1) | 1049C-55 | 1049D-55 | 1049E-55 | 1049F-55 (USAF C-121C) | 1049G-82...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: 56-16-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 56-16-02 SUBJECT HEADING: LOCKHEED All Models 49, 149, 649, 749, and 1049 Series ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 56-16-02 LOCKHEED: Applies to All Models 49, 149, 649, 749 and 1049 Series Aircraft Equipped With Bendix Eclipse-Pioneer Type PB-10 Series Automatic Pilot Installations. Compliance required as indicated. Numerous instances of fatigue failures have been reported in the side webs of the Bendix Eclipse-Pioneer Type DQ-15 Series servo disconnect mounting brackets in the primary flight control system. Since complete failure could result in disabling the flight control system, the following must be accomplished as indicated: 1. The rudder and elevator servo disconnect mounting bracket installations in the primary flight control system must be inspected by dye penetrant or equivalent method, at 125-hour intervals until item 2 is accomplished. Defective servo mounting brackets must be discarded. 2. To be accomplished as soon as possible but not to exceed next overhaul period after parts become available. The rudder and elevator servo must be reinforced by installation of a secondary servo support bracket to provide additional support and vibration dampening. (Bendix Eclipse-Pioneer Service Bulletin No. 858 and Lockheed Service Bulletins Nos. 49-864 and 1049-2830 also cover this subject.) FOOTER:
Document Text
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AD Final Rules - DRS_56-16-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 56-16-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED All Models 49, 149, 649, 749, and 1049 Series Subject: Automatic Pilot Servo Brackets Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 1049-54 | 1049B-55 (Navy R7V-1) | 1049C-55 | 1049D-55 | 1049E-55 | 1049F-55 (USAF C-121C) | 1049G-82...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: 56-16-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 56-16-02 SUBJECT HEADING: LOCKHEED All Models 49, 149, 649, 749, and 1049 Series ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 56-16-02 LOCKHEED: Applies to All Models 49, 149, 649, 749 and 1049 Series Aircraft Equipped With Bendix Eclipse-Pioneer Type PB-10 Series Automatic Pilot Installations. Compliance required as indicated. Numerous instances of fatigue failures have been reported in the side webs of the Bendix Eclipse-Pioneer Type DQ-15 Series servo disconnect mounting brackets in the primary flight control system. Since complete failure could result in disabling the flight control system, the following must be accomplished as indicated: 1. The rudder and elevator servo disconnect mounting bracket installations in the primary flight control system must be inspected by dye penetrant or equivalent method, at 125-hour intervals until item 2 is accomplished. Defective servo mounting brackets must be discarded. 2. To be accomplished as soon as possible but not to exceed next overhaul period after parts become available. The rudder and elevator servo must be reinforced by installation of a secondary servo support bracket to provide additional support and vibration dampening. (Bendix Eclipse-Pioneer Service Bulletin No. 858 and Lockheed Service Bulletins Nos. 49-864 and 1049-2830 also cover this subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
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