AD 70-10-04
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | Sprague Engineering | 707-100 Long Body | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| aircraft | The Boeing Company | Sprague Engineering | 707-100B Long Body | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| aircraft | The Boeing Company | Sprague Engineering | 707-100B Short Body | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| aircraft | The Boeing Company | Sprague Engineering | 707-200 | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| aircraft | The Boeing Company | Sprague Engineering | 707-300 Series | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| aircraft | The Boeing Company | Sprague Engineering | 707-300B Series | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| aircraft | The Boeing Company | Sprague Engineering | 707-300C Series | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| aircraft | The Boeing Company | Sprague Engineering | 707-400 Series | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| aircraft | The Boeing Company | Sprague Engineering | 720 Series | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| aircraft | The Boeing Company | Sprague Engineering | 720B Series | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| appliance | The Boeing Company | Sprague Engineering | 707-100 Long Body | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| appliance | The Boeing Company | Sprague Engineering | 707-100B Long Body | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| appliance | The Boeing Company | Sprague Engineering | 707-100B Short Body | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| appliance | The Boeing Company | Sprague Engineering | 707-200 | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| appliance | The Boeing Company | Sprague Engineering | 707-300 Series | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| appliance | The Boeing Company | Sprague Engineering | 707-300B Series | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| appliance | The Boeing Company | Sprague Engineering | 707-300C Series | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| appliance | The Boeing Company | Sprague Engineering | 707-400 Series | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| appliance | The Boeing Company | Sprague Engineering | 720 Series | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| appliance | The Boeing Company | Sprague Engineering | 720B Series | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| appliance | The Boeing Company | Sprague Engineering | 737-100 Series | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| appliance | The Boeing Company | Sprague Engineering | 737-200 Series | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| appliance | The Boeing Company | Sprague Engineering | 737-200C Series | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
| appliance | The Boeing Company | Sprague Engineering | Accumulator Assemblies | Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 |
Unsafe Condition
Hydraulic accumulator end cap failure due to cyclic fatigue and subsequent explosive hazard to personnel, structure and surrounding equipment, as well as loss of hydraulic system fluid and pressure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the aluminum end caps on Sprague Accumulator Assemblies, P/N A-200-25 and -50, with steel end caps, Sprague P/N 60257-2 (oil end cap) and P/N 60257-3 (air end cap), following Sprague Engineering Modification Bulletin No. 2, dated March 28, 1969, or later FAA approved revisions, and Sprague Overhaul Instructions with Parts Breakdown, Accumulator Assembly, A-200 Series, dated September 1967, or an equivalent installation approved by the FAA.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 3000 hours time in service after the effective date of this AD
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Affected Aircraft
Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 installed on all civil aircraft certificated in all categories including Boeing Models 707/720/737 and Convair Model 22 Aircraft
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Accumulator Assemblies
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_70-10-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 70-10-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all C...Show more Subject: Accumulator Assemblies Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/16/1970 Make: The Boeing Company | Sprague Engineering 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: Appliance Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 70-10-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-988 AD NUMBER: 70-10-04 SUBJECT HEADING: Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 ACTION: SUMMARY: DATES: Effective May 16, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 70-10-04 SPRAGUE ENGINEERING: Amdt. 39-988. Applies to all civil aircraft certificated in all categories including, but not limited to the Boeing Models 707/720/737 aircraft and Convair Model 22 aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 installed. Compliance required within the next 3000 hours time in service after the effective date of this AD, unless already accomplished. To prevent hydraulic accumulator end cap failure due to cyclic fatigue and subsequent explosive hazard to personnel, structure and surrounding equipment, as well as loss of hydraulic system fluid and pressure, accomplish the following: Replace the aluminum end caps on Sprague Accumulator Assemblies, P/N A-200-25 and -50, with steel end caps, Sprague P/N 60257-2 (oil end cap) and P/N 60257-3 (air end cap), in accordance with the instructions of Sprague Engineering Modification Bulletin No. 2, dated March 28, 1969, or later FAA approved revisions and Sprague Overhaul Instructions with Parts Breakdown, Accumulator Assembly, A-200 Series, dated September, 1967, or an equivalent installation and replacement approved by the Chief, Aircraft Engineering Division, FAA Western Region. This amendment becomes effective May 16, 1970. FOOTER:
Document Text
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AD Final Rules - DRS_70-10-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 70-10-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all C...Show more Subject: Accumulator Assemblies Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/16/1970 Make: The Boeing Company | Sprague Engineering 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: Appliance Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 70-10-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-988 AD NUMBER: 70-10-04 SUBJECT HEADING: Airworthiness Directives; SPRAGUE ENGINEERING: Applies to all Civil Aircraft Certificated in all Categories including, but not Limited to the Boeing Models 707/720/737 Aircraft and Convair Model 22 Aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 ACTION: SUMMARY: DATES: Effective May 16, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 70-10-04 SPRAGUE ENGINEERING: Amdt. 39-988. Applies to all civil aircraft certificated in all categories including, but not limited to the Boeing Models 707/720/737 aircraft and Convair Model 22 aircraft with the Sprague Engineering Accumulator Assemblies, P/N A-200-25 and A-200-50 installed. Compliance required within the next 3000 hours time in service after the effective date of this AD, unless already accomplished. To prevent hydraulic accumulator end cap failure due to cyclic fatigue and subsequent explosive hazard to personnel, structure and surrounding equipment, as well as loss of hydraulic system fluid and pressure, accomplish the following: Replace the aluminum end caps on Sprague Accumulator Assemblies, P/N A-200-25 and -50, with steel end caps, Sprague P/N 60257-2 (oil end cap) and P/N 60257-3 (air end cap), in accordance with the instructions of Sprague Engineering Modification Bulletin No. 2, dated March 28, 1969, or later FAA approved revisions and Sprague Overhaul Instructions with Parts Breakdown, Accumulator Assembly, A-200 Series, dated September, 1967, or an equivalent installation and replacement approved by the Chief, Aircraft Engineering Division, FAA Western Region. This amendment becomes effective May 16, 1970. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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