AD 63-03-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 707-100B Long Body | Airworthiness Directives; BOEING Models 707-100B, 707-300B, 720-000B Series and DOUGLAS DC-8-50 Series Aircraft |
| aircraft | The Boeing Company | 707-100B Short Body | Airworthiness Directives; BOEING Models 707-100B, 707-300B, 720-000B Series and DOUGLAS DC-8-50 Series Aircraft |
| aircraft | The Boeing Company | 707-300B Series | Airworthiness Directives; BOEING Models 707-100B, 707-300B, 720-000B Series and DOUGLAS DC-8-50 Series Aircraft |
| aircraft | The Boeing Company | 720 Series | Airworthiness Directives; BOEING Models 707-100B, 707-300B, 720-000B Series and DOUGLAS DC-8-50 Series Aircraft |
| aircraft | The Boeing Company | 720B Series | Airworthiness Directives; BOEING Models 707-100B, 707-300B, 720-000B Series and DOUGLAS DC-8-50 Series Aircraft |
| aircraft | The Boeing Company | DC-8-51 | Airworthiness Directives; BOEING Models 707-100B, 707-300B, 720-000B Series and DOUGLAS DC-8-50 Series Aircraft |
| aircraft | The Boeing Company | DC-8-52 | Airworthiness Directives; BOEING Models 707-100B, 707-300B, 720-000B Series and DOUGLAS DC-8-50 Series Aircraft |
| aircraft | The Boeing Company | DC-8-53 | Airworthiness Directives; BOEING Models 707-100B, 707-300B, 720-000B Series and DOUGLAS DC-8-50 Series Aircraft |
| aircraft | The Boeing Company | DC-8-55 | Airworthiness Directives; BOEING Models 707-100B, 707-300B, 720-000B Series and DOUGLAS DC-8-50 Series Aircraft |
Unsafe Condition
Clogging of engine main oil filters by foreign matter has caused lubrication system malfunctions which have resulted in engine mechanical failures affecting safety of flight.
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Required Actions
Modify the engine oil filter assembly to install a differential pressure switch and an additional spring in the bypass valve per Service Bulletin No. 327. Install a pressure switch across the engine main oil system filter set to actuate at approximately 50 p.s.i., following Boeing Service Bulletin No. 1586 or Douglas Service Bulletin No. 79-11. Provide cockpit indications for the pressure switch actuation as per respective service bulletins.
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Compliance Time
within the next 4,000 hours' time in service after the effective date of this AD
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Affected Aircraft
Boeing Models 707-100B, 707-300B, 720-000B Series and Douglas DC-8-50 Series Aircraft with Pratt & Whitney JT3D Series engines, as listed in respective service bulletins.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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