Propeller servicing in C-130 Technical Posted November 25, 2007 Gmon wrote: You cant be too sure of how much is in the propeller unless you serviced a dry prop. Absolutely correct! Yet given that I get around 50 dry props a year, 40 of them take 6gal of fluid, 8 will take 5gal 2qrt, and the remaining 2 will take up to 7gal. The only consistant thing being the point at which the feather cutout switch actuates, and when the low light goes off (if the level switch is functional). So the end result is, you can do whatever you like, as long as it is IAW applicable TO or MM. You need to be sure in your mind that there is sufficient fluid in the prop - it is your signature/stamp in the forms, therefore your @ss is on the line. It is my experience that a prop serviced now, checked as overserviced (atmospheric sump), 10 minutes into the run suddenly has low oil light, and will take another 2 - 3 qrts; or, standing overnight will be low the next day. Each prop is different and needs to be treated as such. I feel more comfortable using the pressurized sump, because I often work alone.