AD 70-25-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-200 | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300 Series | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 720 Series | BOEING Model 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 720B Series | BOEING Model 707 and 720 Series Airplanes |
Unsafe Condition
Fluid bypassing within the Rudder Power Control Unit (PCU) could occur.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the Rudder PCU in accordance with Boeing Service Bulletin 2998, dated October 1, 1970, or later FAA approved revision or an equivalent method approved by the Chief, Aircraft Engineering Division, FAA Western Region.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 300 hours' time in service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Model 707 and 720 Series airplanes listed in Boeing Service Bulletin 2998, dated October 1, 1970, or later FAA approved revisions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Rudder Power Control Unit
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_70-25-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 70-25-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING Model 707 and 720 Series Airplanes Subject: Rudder Power Control Unit Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 12/11/1970 Make: The Boeing Company Model: 707-100 Long Body | 707-100B Long Body | 707-100B Short Body | 707-200 | 707-300 Series | 707-300B S...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: 70-25-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1125 AD NUMBER: 70-25-07 SUBJECT HEADING: BOEING Model 707 and 720 Series Airplanes ACTION: SUMMARY: DATES: Effective December 11, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 70-25-07 BOEING: Amdt. 39-1125. Applies to Model 707 and 720 Series airplanes listed in Boeing Service Bulletin 2998, dated October 1, 1970, or later FAA approved revisions. To prevent fluid bypassing within the Rudder Power Control Unit (PCU) accomplish the following: Within the next 300 hours' time in service after the effective date of this AD, unless previously accomplished, modify the Rudder PCU in accordance with Boeing Service Bulletin 2998, dated October 1, 1970, or later FAA approved revision or an equivalent method approved by the Chief, Aircraft Engineering Division, FAA Western Region. This amendment becomes effective December 11, 1970. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_70-25-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 70-25-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING Model 707 and 720 Series Airplanes Subject: Rudder Power Control Unit Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 12/11/1970 Make: The Boeing Company Model: 707-100 Long Body | 707-100B Long Body | 707-100B Short Body | 707-200 | 707-300 Series | 707-300B S...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: 70-25-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1125 AD NUMBER: 70-25-07 SUBJECT HEADING: BOEING Model 707 and 720 Series Airplanes ACTION: SUMMARY: DATES: Effective December 11, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 70-25-07 BOEING: Amdt. 39-1125. Applies to Model 707 and 720 Series airplanes listed in Boeing Service Bulletin 2998, dated October 1, 1970, or later FAA approved revisions. To prevent fluid bypassing within the Rudder Power Control Unit (PCU) accomplish the following: Within the next 300 hours' time in service after the effective date of this AD, unless previously accomplished, modify the Rudder PCU in accordance with Boeing Service Bulletin 2998, dated October 1, 1970, or later FAA approved revision or an equivalent method approved by the Chief, Aircraft Engineering Division, FAA Western Region. This amendment becomes effective December 11, 1970. 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.
