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Conducting an engine start with no AC power available.  If the battery is the sole source of DC power, and an air source is available (i.e. the APU available, but the APU generator is inoperative), only the No. 1 engine may be started.  The No. 1 engine start valve is powered by the DC essential bus, and no instruments will operate until the AC power becomes available.  The No. 2 engine start valve is powered by the No. 2 DC primary bus, and requires an operational main or APU generator, or an external power source.
Pressing the No.1 engine starter button opens the No.1 engine start valve, allowing air supplied by the APU to enter the No.1 starter and the No.1 engine.
5. LEARNING STEP/ACTIVITY No. 5. Identify the operational characteristics of the engine lubrication system.
a. Lubrication System- The entire engine lubrication system is integral with the engine.  A 1.7 gallon oil tank is housed within the cold section and a liquid to liquid heat exchanger cools the oil with fuel.  The lubrication system is a dry sump system that lubricates the AGB and 3 sumps containing bearings that support Ng and Np.  An emergency lubrication system provides lubrication to the engine should there be an oil system malfunction.  The oil filter has a bypass function that routes oil around the filter should it become clogged.
(1)
Oil Tank- The oil tank is integral with the engine and has a 1.7 gallon capacity.  A visual indication of the oil level is through a vertical sight-glass on each side of the tank.  

Oil consumption can be up to 1 quart for every 6.5 flight hours, verify the oil level is far enough above the add marker to complete the planned mission, two quarts are required to service the engine from the ADD mark to the FULL mark.  If a flight over 6 hours is to be made the engine oil level must be at the full line of sight glass before the flight.

(2)
Oil Pump- The oil pump, located on the front of the AGB, contains 7 elements, 1 pump element and 6 scavenge elements.  The oil pump is driven by the AGB, variable IAW Ng, so normal oil pressure varies from 20 to 100 psi.

(3)
Oil Filter- The oil filter is located on the forward end of the accessory gearbox.  The oil filter consists of a stainless steel bowl with an impending bypass indicator, a throw away filter element, and a bypass valve assembly. The bowl threads into the forward side of the accessory gearbox.  The bypass valve assembly threads into the accessory gearbox and supports the aft end of the filter element.  If the impending bypass indicator button pops, it means that the filter element is dirty and that it needs to be

replaced.  Once the button has popped, it cannot be reset until the bowl and the filter element has been removed. The oil filter bypass sensor switch (located next to the filter) will send a signal to the cockpit and illuminate the #1 or #2 OIL FLTR BYPASS caution lights to let the pilot know the filter is in a bypass condition.  When the oil temperature reaches about 38 oC the caution should disappear.
　
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