(c)  
Wait for 5 (five) minutes and then make sure there is no fuel leakage from the electrical conduit at the front spar.

(d)  
If you find leakage, then you must replace the section of the electrical conduit where the leak is before the next flight.

Sep 01/02 28-21-71 Page 609

M54207M53158
Fueling Float Switch and Conduit Inspection  500 
28-21-71  Figure 602  Sep 01/02 
Page 610 

500  Recommended Knot 
Sep 01/02  Figure 603  28-21-71 Page 611 

4.  AIRPLANES WITH TYPE II FLOAT SWITCH; Center Tank Drain Port Inspection (Fig. 604)
A.  General
(1)  
There are two types of float switches that can be installed.  TheType I float switch installation has a red float shell.  The Type II float switch has a green float shell.  Service Bulletin (SB) 28-1142 replaces the Type I float switch installation with the Type II float switch installation.  The conduit for the Type I float switch does not contain a liner. This task is applicable only for the Type II float switch conduit.

(2)  
This task does an inspection of the drain slots in the drain port.  It also makes sure the conduit liner is installed and the conduit does not have leakage.

B.  Procedure
(1)  
Do these steps to remove the drain port:

(a)  
Remove the lockwire from the drain port.

(b)  
Loosen the drain port from the conduit and slide it along the electrical cable away from the bulkhead union on the front spar.

(2)  
Do these steps to examine the six (6) drain slots of the drain port and clean then if it is necessary:

(a)  
With a flashlight, make sure each of the six slots in the drain port are not blocked.

(b)  
If any of the drain slots are blocked, clean them with compressed air. 1) Apply compressed air from the side of the drain port that is towards the fuel tank when it is installed.

2)  Make sure the blockage is removed and the six slots are open to permit drainage of the conduit.
(3)  
Make sure there is no indication of fuel leakage from the conduit.

(4)  
Make sure a liner (clear, convoluted plastic tube) is installed in the conduit.

(5)  
Do these steps to re-install the drain port:

(a)  
Slide the drain port assembly along the electrical cable to the bulkhead union on the front spar.

(b)  
Install the drain port on the bulkhead union on the front spar.

NOTE: Make sure the drain port shoulder is seated inside the formed liner.

(c)
Tighten the drain port to a torque of 9.0-11.0 inch-pounds (1.02-1.24 Nm).

(d)
Install lockwire from the coupling nut to the bolt (AMM 20-10-191/401).

M54207
500 
28-21-71 Page 612  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/03 

W02044 W02049
500  Center Tank Float Switch (Type II) Drain Port 
May 01/03  Figure 604 (Sheet 1)  28-21-71 
Page 613 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Center Tank Float Switch (Type II) Drain Port  500 
28-21-71  Figure 604 (Sheet 2)  May 01/03 
Page 614 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

FUELING POWER CONTROL SWITCH - REMOVAL/INSTALLATION
1.  General
A.  The fueling power control switch is located at the forward, outboard corner of the fueling station. Positive actuation of the switch depends on correct gap adjustment between the stationary sensor (magnetic switch) and the movable actuator (magnet) which moves with the hinged fueling station access door. A range of gap adjustment is provided by elongated slots for the sensor bracket mounting screw holes. The actuator bracket is fixed in position.
B.  This section covers removal/installation of the sensor part of the fueling power switch, gap adjustment between sensor and actuator, and repair of the magnet/bracket attachment of the actuator assembly. Removal/installation of the actuator assembly is obvious.
2.  Equipment and Materials
A.  Non-magnetic feeler gage - 0.06, 0.08, 0.10 inch thickness blades or rods. 
B.  Repair materials (if magnet is missing on actuator bracket, or loose).
(1)  
Primer, Zinc Chromate - TT-P-1757 Color Y.

(2)  
Adhesive - BMS 5-19 Class B or BMS 5-44 Class B or BMS 5-79
Class B (Ref 20-30-11).

3.  Remove Fueling Power Control Switch Sensor (Fig. 401)
　
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