Refuel Defuel System - Circuit Diagram
 Figure 005A (SHEET 4)

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 Refuel/Defuel System - Circuit Diagram
 Figure 005B (SHEET 1) 
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 Refuel/Defuel System - Circuit Diagram
 Figure 005B (SHEET 2) 
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 Refuel/Defuel System - Circuit Diagram
 Figure 005B (SHEET 3) 
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 Refuel/Defuel System - Circuit Diagram
 Figure 005B (SHEET 4) 
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 Refuel/Defuel System - Interfaces Figure 006
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 6. Component Description
_____________________
 A. Refuel/Defuel Control Panel
 The primary components on the refuel/defuel control panel are:
 -
the control panel 800VU

 -
the fuel quantity preselector 5QT (Ref. 28-42-00)

 -
the fuel quantity indicator 6QT (Ref. 28-42-00).

 The control panel 800VU has:
 -
a BATT POWER (refuel-on-battery) switch 10PR (Ref. 24-67-00)

 -
a MODE SELECT switch 3QU

 -
a MODE SELECT OPEN light 21QU

 -
a TEST P/BSW 2QJ (Ref. 28-46-00)

 -
three fuel tank hi-level indicator-lights 3QJ, 4QJ, 5QJ (Ref. 28-46-00)

 -
three REFUEL VALVES switches 4QU, 5QU, 6QU.

R **ON A/C 001-049, 052-099, 101-149, 151-199, 201-299, 301-399, 401-499,
 B. Refuel/Defuel Coupling 40QM
 (Ref. Fig. 007)

 The refuel coupling has an L-shaped hollow body. At one end of the coupling is a mounting flange for attachment to the aircraft. At the other end a refuel adaptor is installed. The refuel adaptor contains:
 -an inner and outer compression spring
 -
a valve

 -
a valve seal

 -
a coupling ring.

 An O-ring seal, between the refuel coupling body and the adaptor, prevents fuel leaks. When the refuel coupling is not in use, spring pressure holds the valve against the seal. This prevents a leakage of fuel from the coupling. The refuel coupling cap 41QM attaches to the coupling ring, and gives a secondary seal to the refuel/defuel coupling. The coupling ring has a groove around its circumference. The groove lets the coupling ring break away from the refuel/defuel coupling if a specified force is applied to it. This prevents damage to the aircraft structure.
 When the refuel hose engages the coupling ring, the valve moves off the seal. This opens the fuel system to the external fuel supply and seals the refuel hose to the coupling.
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 Refuel Coupling and Cap Figure 007
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 **ON A/C 051-051,

 B. Refuel/Defuel Coupling 100QM(40QM)
 (Ref. Fig. 007)

 The refuel coupling has an L-shaped hollow body. At one end of the coupling is a mounting flange for attachment to the aircraft. At the other end a refuel adaptor is installed. The refuel adaptor contains:
 -an inner and outer compression spring
 -
a valve

 -
a valve seal

 -
a coupling ring.

 An O-ring seal, between the refuel coupling body and the adaptor, prevents fuel leaks. When the refuel coupling is not in use, spring pressure holds the valve against the seal. This prevents a leakage of fuel from the coupling. The refuel coupling cap 101QM(41QM) attaches to the coupling ring, and gives a secondary seal to the refuel/defuel coupling. The coupling ring has a groove around its circumferance. The groove lets the coupling ring break away from the refuel/defuel coupling if a specified force is applied to it. This prevents damage to the aircraft structure.
 When the refuel hose engages the coupling ring, the valve moves off the seal. This opens the fuel system to the external fuel supply and seals the refuel hose to the coupling.

R **ON A/C 001-049, 052-099, 101-149, 151-199, 201-299, 301-399, 401-499,
　
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