Method of retrofitting a gear box assembly with an emergency lubrication system

A method of retrofitting a gear box assembly with an emergency lubrication system, the gear box assembly including a gearbox housing defining a lubricant sump, an accessory module, and a transmission positioned within the gearbox housing, the method comprising:

• removing plugs from visual inspection ports of the gearbox housing;
• removing a breather from a breather port of the gearbox housing;
• installing jet plugs into the respective visual inspection ports and breather port, wherein each jet plug includes a respective jet tube;
• and
• securing a first emergency lubrication reservoir and a second emergency lubrication reservoir to the accessory module of the gearbox housing and fluidly coupling the first emergency lubrication reservoir with the transmission, wherein only the first emergency lubrication reservoir is coupled to the jet plugs, wherein the second emergency lubrication reservoir includes a pump, wherein during operation of the lubricant system lubricant flows from the second emergency lubrication reservoir to the first emergency lubrication reservoir to the transmission and is collected in the lubricant sump;
• wherein in the step of securing the first emergency lubrication reservoir and the second emergency lubrication reservoir to the accessory module of the gearbox housing, lubricant from the lubricant sump does not return to the first emergency lubrication reservoir or the second emergency lubrication reservoir.