AD 74-18-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING Model 707/720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING Model 707/720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING Model 707/720 Series Airplanes |
| aircraft | The Boeing Company | 707-200 | BOEING Model 707/720 Series Airplanes |
| aircraft | The Boeing Company | 707-300 Series | BOEING Model 707/720 Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING Model 707/720 Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING Model 707/720 Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING Model 707/720 Series Airplanes |
| aircraft | The Boeing Company | 720 Series | BOEING Model 707/720 Series Airplanes |
| aircraft | The Boeing Company | 720B Series | BOEING Model 707/720 Series Airplanes |
Unsafe Condition
Potential oscillatory longitudinal flight due to contour mismatch of the upper surfaces between the horizontal stabilizer and elevator.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect and adjust the contour mismatch of the upper surfaces between the horizontal stabilizer and elevator in accordance with Boeing Service Bulletin No. 3151 or later FAA approved revisions, or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
By September 1, 1976
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
All model 707/720 series airplanes, certificated in all categories.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Horizontal Stabilizer and Elevator
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_74-18-10.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-18-10 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING Model 707/720 Series Airplanes Subject: Horizontal Stabilizer and Elevator Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: 707-100 Long Body | 707-100B Long Body | 707-100B Short Body | 707-200 | 707-300 Series | 707-300B Series | 707-300C Series | 707-400 Series ...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: 74-18-10 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1945 AD NUMBER: 74-18-10 SUBJECT HEADING: BOEING Model 707/720 Series Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-18-10 BOEING: Amendment 39-1945. Applies to all model 707/720 series airplanes, certificated in all categories. Compliance required as indicated. To prevent potential oscillatory longitudinal flight on Boeing models 707/720 series airplanes, accomplish the following: By September 1, 1976, unless already accomplished, inspect and adjust the contour mismatch of the upper surfaces between the horizontal stabilizer and elevator in accordance with Boeing Service Bulletin No. 3151, or later FAA approved revisions or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. This amendment becomes effective thirty (30) days after publication in the Federal Register. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_74-18-10.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-18-10 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING Model 707/720 Series Airplanes Subject: Horizontal Stabilizer and Elevator Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: 707-100 Long Body | 707-100B Long Body | 707-100B Short Body | 707-200 | 707-300 Series | 707-300B Series | 707-300C Series | 707-400 Series ...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: 74-18-10 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1945 AD NUMBER: 74-18-10 SUBJECT HEADING: BOEING Model 707/720 Series Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-18-10 BOEING: Amendment 39-1945. Applies to all model 707/720 series airplanes, certificated in all categories. Compliance required as indicated. To prevent potential oscillatory longitudinal flight on Boeing models 707/720 series airplanes, accomplish the following: By September 1, 1976, unless already accomplished, inspect and adjust the contour mismatch of the upper surfaces between the horizontal stabilizer and elevator in accordance with Boeing Service Bulletin No. 3151, or later FAA approved revisions or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. This amendment becomes effective thirty (30) days after publication in the Federal Register. 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.
Related Airworthiness Directives
2023-12-15
final ruleAirworthiness Directives; The Boeing Company Airplanes
Unsafe Condition: 5G C-Band interference can cause radio altimeters to not perform their intended function, resulting in increased flightcrew workload while on approach with the flight director, autothrottle, or aut...
2023-10-02
final ruleAirworthiness Directives; Transport and Commuter Category Airplanes
Unsafe Condition: Radio altimeter anomalies that are undetected by the automation or pilot, particularly close to the ground (e.g., landing flare), could lead to loss of continued safe flight and landing. Additional...
2022-25-01 Recurring
final ruleAirworthiness Directives; The Boeing Company Airplanes
Unsafe Condition: cracking in fastener holes at the center wing box and at certain positions of the rear spar and lower skin
2020-03-11
final ruleAirworthiness Directives; The Boeing Company Airplanes
Unsafe Condition: The potential for a fuel tank ignition source to occur from the FQIS due to its design architecture, component design details, and installation design details.
