AD 74-20-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-100 Series | BOEING Model 737 Airplanes |
| aircraft | The Boeing Company | 737-200 Series | BOEING Model 737 Airplanes |
| aircraft | The Boeing Company | 737-200C Series | BOEING Model 737 Airplanes |
| aircraft | The Boeing Company | 737-300 Series | BOEING Model 737 Airplanes |
| aircraft | The Boeing Company | 737-400 Series | BOEING Model 737 Airplanes |
| aircraft | The Boeing Company | 737-500 Series | BOEING Model 737 Airplanes |
| aircraft | The Boeing Company | 737-600 Series | BOEING Model 737 Airplanes |
| aircraft | The Boeing Company | 737-700 Series | BOEING Model 737 Airplanes |
| aircraft | The Boeing Company | 737-800 Series | BOEING Model 737 Airplanes |
Unsafe Condition
Erroneous information displayed on pitot-static flight instruments due to inadequate vertical rise in pitot static tubing inboard of each pitot-static probe.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the pitot static tubing to include a vertical rise just inboard of each pitot-static probe in accordance with Boeing Service Bulletin 737-34-1031 or later FAA approved revisions. The modification must be done 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
Within the next 3500 hours time in service after the effective date of this AD
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Affected Aircraft
All Model 737 airplanes, certificated in all categories, listed in Boeing Service Bulletin 737-34-1031 dated March 1, 1974, or later FAA approved revisions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Pitot Static Tubing
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_74-20-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-20-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING Model 737 Airplanes Subject: Pitot Static Tubing Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: 737-100 Series | 737-200 Series | 737-200C Series | 737-300 Series | 737-400 Series | 737-500 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: 74-20-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1969 AD NUMBER: 74-20-02 SUBJECT HEADING: BOEING Model 737 Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-20-02 BOEING: Amendment 39-1969. Applies to all Model 737 airplanes, certificated in all categories, listed in Boeing Service Bulletin 737-34-1031 dated March 1, 1974, or later FAA approved revisions. To prevent erroneous information from being displayed on the pitot-static flight instruments: Within the next 3500 hours time in service after the effective date of this AD, modify the pitot static tubing to include a vertical rise just inboard of each pitot-static probe in accordance with Boeing Service Bulletin 737-34-1031, dated March 1, 1974, or later FAA approved revisions, or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA, Northwest Region. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124. The documents may be examined at FAA Northwest Region, 9010 East Marginal Way, Seattle, Washington. This amendment becomes effective 30 days after September 25, 1974. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_74-20-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 74-20-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING Model 737 Airplanes Subject: Pitot Static Tubing Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: 737-100 Series | 737-200 Series | 737-200C Series | 737-300 Series | 737-400 Series | 737-500 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: 74-20-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-1969 AD NUMBER: 74-20-02 SUBJECT HEADING: BOEING Model 737 Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 74-20-02 BOEING: Amendment 39-1969. Applies to all Model 737 airplanes, certificated in all categories, listed in Boeing Service Bulletin 737-34-1031 dated March 1, 1974, or later FAA approved revisions. To prevent erroneous information from being displayed on the pitot-static flight instruments: Within the next 3500 hours time in service after the effective date of this AD, modify the pitot static tubing to include a vertical rise just inboard of each pitot-static probe in accordance with Boeing Service Bulletin 737-34-1031, dated March 1, 1974, or later FAA approved revisions, or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA, Northwest Region. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124. The documents may be examined at FAA Northwest Region, 9010 East Marginal Way, Seattle, Washington. This amendment becomes effective 30 days after September 25, 1974. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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