AD 66-06-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100 Long Body | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Long Body | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-100B Short Body | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-200 | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300 Series | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300B Series | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-300C Series | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 707-400 Series | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 720 Series | BOEING Models 707 and 720 Series Airplanes |
| aircraft | The Boeing Company | 720B Series | BOEING Models 707 and 720 Series Airplanes |
Unsafe Condition
The aft edges of the turbocompressor dipstick access door becoming unfaired in flight can cause erroneous readings of the engine pressure ratio (EPR) system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install an additional rotary latch on the aft edge of the access door in accordance with Boeing Service Bulletin No. 2143 or later FAA-approved revision or an equivalent 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 1,800 hours' time in service after the effective date of this AD unless already accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Boeing Models 707 and 720 Series Airplanes equipped with turbofan engines and strut-mounted P(t2) probes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Engine Pressure Ratio System
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_66-06-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 66-06-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING Models 707 and 720 Series Airplanes Subject: Engine Pressure Ratio System Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 03/26/1966 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: 66-06-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-200 AD NUMBER: 66-06-02 SUBJECT HEADING: BOEING Models 707 and 720 Series Airplanes ACTION: SUMMARY: DATES: Effective March 26, 1966. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 66-06-02 BOEING: Amdt. 39-200 Part 39 Federal Register February 24, 1966. Applies to Models 707 and 720 Series Airplanes Equipped with Turbofan Engines and strut Mounted P(t2) Probes. Compliance required within the next 1,800 hours' time in service after the effective date of this AD unless already accomplished. There have been numerous instances of the aft edges of the turbocompressor dipstick access door, which is in front of the strut mounted P(t2) probe, becoming unfaired in flight and causing erroneous readings of the EPR (engine pressure ratio) system. To prevent erroneous readings of the EPR system, install an additional rotary latch on the aft edge of the access door in accordance with Boeing Service Bulletin No. 2143 or later FAA-approved revision or an equivalent approved by the Chief, Aircraft Engineering Division, FAA Western Region. This directive effective March 26, 1966. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_66-06-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 66-06-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING Models 707 and 720 Series Airplanes Subject: Engine Pressure Ratio System Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 03/26/1966 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: 66-06-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-200 AD NUMBER: 66-06-02 SUBJECT HEADING: BOEING Models 707 and 720 Series Airplanes ACTION: SUMMARY: DATES: Effective March 26, 1966. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 66-06-02 BOEING: Amdt. 39-200 Part 39 Federal Register February 24, 1966. Applies to Models 707 and 720 Series Airplanes Equipped with Turbofan Engines and strut Mounted P(t2) Probes. Compliance required within the next 1,800 hours' time in service after the effective date of this AD unless already accomplished. There have been numerous instances of the aft edges of the turbocompressor dipstick access door, which is in front of the strut mounted P(t2) probe, becoming unfaired in flight and causing erroneous readings of the EPR (engine pressure ratio) system. To prevent erroneous readings of the EPR system, install an additional rotary latch on the aft edge of the access door in accordance with Boeing Service Bulletin No. 2143 or later FAA-approved revision or an equivalent approved by the Chief, Aircraft Engineering Division, FAA Western Region. This directive effective March 26, 1966. 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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