AD 63-03-01

63-03-01 BOEING AND DOUGLAS: Amdt. 532 Part 507 Federal Register February 5, 1963. Applies to Boeing Models 707-100B, 707-300B, and 720-000B Series Aircraft, and to Douglas DC-8-50 Series Aircraft With Pratt & Whitney JT3D Series Engines.

Compliance required within the next 4,000 hours' time in service after the effective date of this AD, unless already accomplished.

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. To prevent such failures, accomplish the following:

(a) For Pratt & Whitney JT3D Series engines with serial numbers listed in Pratt & Whitney Engine Service Bulletin No. 327 dated January 8, 1962:

(1) Modify the engine oil filter assembly to provide for the installation of a differential pressure switch between the bypass port and the filter drain port, and provide an additional spring in the bypass valve to increase the pressure at which bypass occurs, in accordance with Service Bulletin No. 327, or FAA approved equivalent.

(2) Install a pressure switch across the engine main oil system filter, set to be actuated when the differential pressure between the inlet and outlet ports reaches a value of approximately 50 p.s.i. This change shall be accomplished in accordance with Boeing Service Bulletin No. 1586 dated April 11, 1962, for Boeing aircraft, and in accordance with Douglas Service Bulletin No. 79-11 (to be issued later) for DC-8 aircraft, or FAA approved equivalent. Prior or concurrent incorporation of (a)(1) is required with this change.

(b) For Boeing Models 707-100B, 707-300B, and 720-000B Series aircraft with serial numbers listed in Boeing Service Bulletin No. 1586 dated April 11, 1962, and for Douglas DC-8-50 Series aircraft listed in Douglas Service Bulletin DC-8 No. 79-11 (to be issued later):

(1) Provide means in the cockpit to give corresponding indication of the actuationof the differential pressure switch on each engine in accordance with Boeing Service Bulletin No. 1586 for Boeing aircraft, and in accordance with Douglas Service Bulletin 79-11 for DC-8 aircraft, or FAA approved equivalent.

NOTE: Any person may submit an equivalent means of compliance with the objective of this directive. Such equivalent means shall be submitted to FAA, Western Region, Attention, Chief, Engineering and Manufacturing Branch, for evaluation and approval. Adequate substantiation of equivalency will be required. If approved, the equivalent means, when accomplished, shall be deemed as compliance with (a) and (b). The objective of this directive is to provide means of preventing serious mechanical damage to engines which would affect safety of flight as a result of lubrication failure of engine main bearings.

(c) When the modifications prescribed in (a) and (b) are accomplished or when an equivalent means of compliance is approved and accomplished, the engine oil filter inspections prescribed by AD 61-24-01 are no longer required.

(d) Appropriate revisions to the FAA Airplane Flight Manual covering procedures required in connection with devices installed shall be prepared and submitted to FAA, Western Region, Attention, Chief, Engineering and Manufacturing Branch, for approval.

This directive effective March 7, 1963.