58-09-03 VICKERS: Applies to All Viscount 700 Series Aircraft.
Compliance required not later than December 31, 1958.
In order to give the flight crew immediate warning of an unacceptable drop in oil pressure on any engine, installation is required of an oil pressure warning means for each engine or a master warning means for all engines with provision for isolating the individual warning means from the master warning means, as provided for in Civil Air regulations, Part 4b, paragraph 4b.604(1). Vickers Modification Bulletin No. D.2270 covers this subject and is considered to describe an acceptable method of compliance. Capital Airlines Modification No. ME-A-58-84 is also considered to describe an acceptable method of compliance. Modifications made in any other way should be submitted to the FAA engineering evaluation and approval.