|Quoting Floreng (Reply 2):|
Thanks Tom, what would happen if the third pump on the lube module (the one that draws from the APU power section bearing) is not pumping because of a damaged gerotor while the other two three-module pumps are pumping OK and the overall pressure shows ok - can that affect the lubrication of the APU power section bearing?
This is not my area of expertise but, as far as I can tell from the schematic, it shouldn't make much difference. I don't have a great sense for the fidelity of the schematic I've got though.
There appear to be seven distinct pumps within the module...three to scavenge the generator, one to scavenge the turbine, and three pressurizing pumps to feed oil to the APU. The output of the three pressurizing pumps appears to be combined; as long as you've got flow and pressure from two remaining pumps, it looks like everything will get oil.
But I'd talk to an APU mechanic or a Honeywell person for a definitive answer on that one.