F.  Check indicator zero values. 
(1)  
Open fuel QTY and EP GRD FUELING circuit breakers (P6 panel).

(2)  
Disconnect P2 test harness and reconnect indicator.

(3)  
Close fuel QTY and EP GRD FUELING circuit breakers.

(4)  
Ensure P2 fuel quantity indicator zero reading is within following tolerances:
Tanks 1 or 2 0 士50 kgs
Center Tank 0 士75 kgs

(5)  
Record P2 fuel quantity indicator zero reading.

(6)  
Record P15 fueling quantity indicator reading.

(7)  
Compare values recorded in steps (5) and (6). Reading of P15 indicator must agree with

readings of P2 indicator within following tolerances:
Tanks 1 or 2 士10 kgs
Center Tank士10 kgs

G.  Perform comparison check of Fuel Quantity Indicating System (FQIS) using the fuel measuring sticks.
(1)  
Open fueling station door.

(2)  
Calculate the fuel quantity for each tank using the fuel measuring sticks (Ref 12-11-0).

(3)  
Verify the calculated fuel quantity (using fuel measuring sticks) for each tank is within the following value of the fuel quantity shown on the fuel quantity indicator is within士200 kgs.

(4)  
Close fueling station door.

H.  Restore airplane to normal
(1)  
Close fueling station access door.

(2)  
Remove leading edge flap locks (Ref 27-81-0 MP).

WARNING:  LEADING EDGE FLAPS ARE FAST ACTING AND CAN CAUSE SERIOUS INJURY TO PERSONNEL.

(3)  
Remove electrical power if no longer required (Ref 24-22-0 MP).

5C8 
28-41-05 Page 510  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 01/96 

MEASURING STICK - REMOVAL/INSTALLATION
1.  Remove Measuring Stick
NOTE: Removal of the measuring stick does not require tank defueling.
A.  Push and turn measuring stick head and extend measuring stick until drip hole is visible. (See figure 401.)
B.  Plug drip hole in cap.
C.  Extend measuring stick until it bottoms.
D.  Loosen bayonet base retaining screws.
E.  Remove one screw.
F.  Holding bayonet base against spring pressure, remove other screw.
NOTE: Spring exerts a force of approximately 5 pounds.
G.  Pull measuring stick and bayonet base free of wing lower surface.
H.  Remove locking pin from measuring stick.
I.  Slip bayonet base free of measuring stick.
2.  Install Measuring Stick
A.  Install new headseal and new 0-ring seals. (See figure 402.)
B.  Assemble measuring stick parts (seal boot with 0-ring seal, sleeve, spring, spring retainer, bayonet and calibrated rod) and attach measuring stick head with locking pin.
C.  Plug drip hole in head.
D.  Insert bayonet assembly into wing lower surface with stick fully extended all the time.
E.  Install two bayonet retaining screws.
F.  Remove plug from drip hole.
G.  Push up measuring stick, turn and lock measuring stick head.
May 15/67 28-41-11 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

 Measuring Stick Installation  500 
28-41-11  Figure 401  Aug 15/67 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Measuring Stick Assembly 
May 15/67  Figure 402  28-41-11 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

MEASURING STICK - APPROVED REPAIRS
1. Repair External Fuel Leak at Measuring Stick Head
A. Turn measuring stick head counterclockwise and withdraw measuring stick far enough to remove head seal 0-ring. Plug drip hole in measuring stick head if fuel starts dripping.
B. Replace head seal with new 0-ring. (See figure 801.)
C. If drip hole was plugged, step (1), push measuring stick part way up and remove plug.
D. Push up measuring stick, turn and lock measuring stick head.
2. Repair Fuel Leak Around Bayonet Base when Measuring Stick is Withdrawn
A. Remove measuring stick from fuel tank. See removal/installation.
B. Replace 0-ring seal on sleeve.
C. Install measuring stick in fuel tank.
3. Repair Fuel Leak Around Measuring Stick
A. Remove measuring stick from fuel tank. See removal/installation.
B. Replace 0-ring seal on seal boot.
C Replace measuring stick if damaged.
D Install measuring stick in fuel tank.

500 
May 15/67  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-41-11 Page 801 
　
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