AD 70-10-04
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 |
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
AI-generated summary from the source AD text. Verify against the official source before acting.
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.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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