TM 1-1520-240-MTF4-18g. ENGINE OIL PRESS — Check and record(20 psi Minimum).h. Engine instruments — Check.NOTEGround idle 60.0 to 63.0 percent N1 is the mini-mum speed at which the engine will operate satis-factorily for extended periods. If the engine speedstabilizes below ground idle, shut down the engineand investigate.i. Ground idle speed after 45 seconds —Check and record.NOTEIf the start is not normal, abort it. If a second startis to be attempted, wait at least 15 seconds afterthe tachometer indicates zero before staring. Thiswill allow sufficient time for fuel to drain out of thecombustion chamber.CAUTIONAfter starting the first engine, the second en-gine must be started or motored for 10 sec-onds within 3 minutes. When operating for ex-tended periods with only one engine operat-ing, the second engine must be motored for 10seconds every 30 minutes. The N2 section ofthe second engine starts turning when thefirst engine is started; however, the lubrica-tion system of the second engine is driven byN1 section: which does not begin to turn untilthe START sequence is initiated. Delay instarting the second engine will result in exces-sive wear on the N2 bearing package andseals.
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