What is the correct order of components in the lubrication loop from the reduction gear sump to the LO header?

What is the correct order of components in the lubrication loop from the reduction gear sump to the LO header?

• A. Sump, Strainer, Oil Cooler, LO Header
• B. Sump, Oil Cooler, Strainer, LO Header
• C. Sump, Strainer, LO Header, Oil Cooler
• D. Sump, LO Header, Strainer, Oil Cooler

Answer: (A)

In a lubrication loop, oil is collected in the gear sump, then filtered to remove debris, cooled to control temperature, and finally delivered to the lubrication header to feed the bearings and gears. The correct sequence is sump → strainer → oil cooler → LO header. Filtering first protects the cooler from fouling and ensures clean oil is cooled, then the cooled oil is distributed evenly through the LO header to the lubrication points. If the order placed the cooler before filtration, debris could clog the cooler or circulate through the system; if the header were before cooling, hot oil would be distributed, reducing lubrication effectiveness.

In a lubrication loop, oil is collected in the gear sump, then filtered to remove debris, cooled to control temperature, and finally delivered to the lubrication header to feed the bearings and gears. The correct sequence is sump → strainer → oil cooler → LO header. Filtering first protects the cooler from fouling and ensures clean oil is cooled, then the cooled oil is distributed evenly through the LO header to the lubrication points. If the order placed the cooler before filtration, debris could clog the cooler or circulate through the system; if the header were before cooling, hot oil would be distributed, reducing lubrication effectiveness.