FUEL INDICATING -FQIS -MAINTENANCE PAGES
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777 AIRCRAFT MAINTENANCE MANUAL
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FUEL INDICATING -FUEL QUANTITY MEASURING STICK ASSEMBLY
General
You can manually measure fuel quantity with the fuel measuring stick assemblies.
Eight measuring stick assemblies install through the bottom of each wing. Six are in each main tank and two are in each section of the center tank. They are numbered from inboard to outboard.
The measuring sticks in the main tanks are installed in the fuel tank access doors. The measuring sticks in the center tank are installed in the lower wing skin.
Physical Description
The fuel measuring stick assemblies have these parts:
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Base
*
Housing
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Magnetic float
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Measuring stick.
The base and housing are inside the tank. There is a red retainer in the base. The magnetic float surrounds the housing and moves up and down the housing as the fuel level changes. There is a float stop at the top of the housing to keep the float on the housing when the tanks are full.
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The measuring stick is inside the housing. The measuring stick is flexible. It has a latch assembly at the bottom and a steel armature at the top. The stick has graduation marks to show the fuel level. The graduation marks are non-dimensional linear units.
You can remove the fuel measuring sticks from the assembly without defueling the airplane.
Operation
You use airplane attitude (pitch and roll) and fuel height to manually measure fuel quantity. The nose wheel well has inclinometers. The right main wheel well has a leveling scale and plumb bob attachment. You use the inclinometers or the leveling scale to measure airplane pitch and roll.
Use a screwdriver to unlock and release the measuring stick latch. Lower the stick to its fully extended length. Raise the stick slowly until you feel the magnetic float catch the stick. Read the graduation mark at the bottom of the stick to get the fuel level. You do this procedure three times to make sure you accurately read the fuel level.
You use airplane attitude, fuel density, and the fuel level from the sticks to find the fuel quantity in the fuel measuring stick conversion tables. The fuel measuring stick conversion tables are in the servicing section of part II of the airplane maintenance manual (AMM).
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FUEL INDICATING -FUEL QUANTITY MEASURING STICK ASSEMBLY
Training Information Point
Because it is flexible, move the measuring stick slowly when you stow it.
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FUEL INDICATING -FUEL QUANTITY MEASURING STICK ASSEMBLY
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