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 C.  The measuring stick assembly consists of three separate subassemblies; a housing and float assembly which includes the stick housing, the float and necessary sealing and attaching features; a stick assembly; and a mounting base (not installed at all locations) that serves as a receptacle for the housing. The calibrated stick may be removed from the housing without draining the fuel tank. However, the housing and float must be installed inside the tank except for those sticks located in the fuel tank access doors.
Measuring Stick (Fig. 1)
_______________
 A.  The fuel measuring sticks provide a manual means of determining fuel quantity in the fuel tanks. The measuring sticks in the main and reserve tanks are installed in housings attached to the lower skin or tank access door. The measuring stick in the center wing tank is installed in a housing on the tank bottom and can be reached by opening an access panel on the wing-to-body fairing.
 B.  Each stick assembly consists of the stick, stick bearing, head, spring,
 washer, retainer, and socket with two packings.Measuring Stick Housing (Fig. 1)
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 A.  The fuel measuring stick housing guides the measuring stick in position and provides a barrier between the fuel and the measuring stick. The housing also holds the float in place.
Operation
_________
 A.  Functional Description
 (1)  To operate the fuel level measuring stick, the stick is unlocked from the base by applying a slight pressure and a 90-degree counterclockwise turn to the end of the stick. When the stick is unlocked, it is lowered to the fully extended position. Depending on fuel level, a bearing located on top of the stick will magnetically latch onto a magnet in the float before full extension. In this event, a slight pressure should be applied to assure a full extension. At the fully extended position, the stick stops against a cushion giving a soft firm feel.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

STICK NO. 17 SEE E
STICK NO. 24 SEE E STICK NO. 19 SEE A
STICK NO. 20 SEE E STICK NO. 18 SEE B
STICK NO. 22
SEE D
STICK NO. 21
SEE C
STICK NO. 33
STICK NO. 23
SEE C
SEE C STICK NO. 34 SEE C
WING AND CENTER WING TANK
CLAMP
FLOAT
MEASURING STICK
MEASURING 
STICK HOUSING 
____NOTE:  MEASURING STICK
HEAD AND SOCKET 
MOUNTING  SHOWN IN LOCKED 
BASE  POSITION. ROTATE 
HEAD 90` COUNTER-
SOCKET  CLOCKWISE TO 
UNLOCK. 
MEASURING 
MEASURING STICK  A  A  STICK HEAD 
READING PLANE  A-A 

A
Fuel Measuring Stick Location
Figure 1 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

UPPER GUIDE  FLOAT 
MEASURING STICK HOUSING MEASURING STICK TANK ACCESS DOOR  FLOAT WING SKIN MOUNTING BASE  MEASURING STICK HOUSING MEASURING STICK TANK ACCESS DOOR  WING SKIN MOUNTING BASE 
MEASURING STICK READING PLANE A  A  SOCKET MEASURING STICK HEAD  MEASURING STICK READING PLANE  A  C  A  SOCKET MEASURING STICK HEAD 
B  CLAMP 
FLOAT 
FLOAT 
MEASURING STICK  MEASURING STICK 
STICK HOUSING MEASURING  MOUNTING BASE  STICK HOUSING MEASURING  STOP LOWER FLOAT 
BAND RETAINING 
WING SKIN 
SOCKET  SOCKET 
MEASURING STICK READING PLANE  A  A  MEASURING STICK HEAD  READING PLANE MEASURING STICK  A  A  STICK HEAD MEASURING 
D  E 
Fuel Measuring Stick Location Figure 1 (Sheet 2)

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