Lubrication system for a turbine engine

A turbine engine comprising:

• a turbo-engine including a shaft;
• a fan drivingly coupled to the shaft of the turbo-engine, wherein rotation of the shaft causes the fan to rotate;
• one or more rotating components in at least one of the turbo-engine or the fan;
• an outer casing that surrounds the turbo-engine and the one or more rotating components;
• and
• a lubrication system for lubricating the one or more rotating components, the lubrication system comprising:
• a primary reservoir that stores a lubricant therein;
• a primary lubrication system supplying the lubricant from the primary reservoir to the one or more rotating components during normal operation of the turbine engine;
• and
• an auxiliary lubrication system comprising:
• an auxiliary reservoir in fluid communication with the primary reservoir and the one or more rotating components and receiving the lubricant from the primary reservoir, the auxiliary reservoir positioned at substantially a six o'clock position of the turbine engine;
• and
• one or more auxiliary drain valves that open to allow the lubricant to flow from the primary reservoir to the auxiliary reservoir and that close to prevent the lubricant to flow from the primary reservoir to the auxiliary reservoir,
• wherein the one or more auxiliary drain valves open when at least one of (i) a pressure of the lubricant in the primary lubrication system, (ii) a pressure of fuel in the turbine engine, or (iii) a pressure of hydraulics of the turbine engine is less than a pressure threshold such that the auxiliary lubrication system supplies the lubricant from the auxiliary reservoir to the one or more rotating components.