With the bladder tanks on the R44, full fuel is 46.5 US gallons, (which is technically 47.7gal gals total fuel with 46.5 gals being useable).
My query is if you ran an R44 until either the “low fuel” light came on (3gals remaining) or exhausted the fuel totally and “dipped” the tanks would those measurements show 3 gallons and 0 gallons respectively?
The details would inlcude the shape of the bottom of the main tank, location of fuel pickup line and location of the float/measurement device for the fuel gauges.
Also, curious if this is different for tanks that have been retrofitted with bladders as opposed to new production bladder tanks.
This is what can be determined from the POH and Maintenance Manual, above and beyond that, you’ll need to take your own measurements or call Technical Support 310-539-0508.
Bladders capacity: 47.7 total 46.5 usable
Without capacity: 50.1 total 48.9 usable
When the gages read E the tanks are empty except for a small quantity of unusable fuel.
The low fuel caution light is actuated by a separate electric sender located on the bottom of the main tank at approximately 3 gallons of usable fuel remaining, except for a small quantity of unusable fuel, enough usable for about 10 minutes at cruise.
Those details including the shape of the tanks, location of fuel pickup and location of the float/measurement device for the fuel gauges can be found in Chapter 12 of the R44 Maintenance Manual and the bladder fuel tank installation guide, link below.
R44 Maintenance Manual
KI-196 R44-series Bladder Fuel Tank Installation Kit Instructions
Edited by iChris, 26 October 2018 - 20:15.