_ fully compressed, and then loosen them one full turn.
 d Turn the spring loaded screws (12) to adjust the attitude
_ monitor until the bubble is in the identified reference square.
 e Put the cover plate (15) in the position for installation.
_
 f Apply BONDING AND ADHESIVE COMPOUNDS (Material No. 08-007A)

_ on the threads of the screws (13) and (14).
 g Install the screw (13) and the three screws (14).
_ h Lower the aircraft on its wheels (Ref. TASK 07-11-00-586-
_
 002).

 5. Close-up
________ Subtask 28-43-24-410-050
 A. Close Access
 (1) Make sure that the work area is clean and clear of tool(s) and other items.
 (2) Close the access panel 192MB. Subtask 28-43-24-942-051
 B. Removal of Equipment
 (1)
 Remove the safety barriers.

 (2)
 Remove the warning notice(s).

 (3)
 Remove the ground support and maintenance equipment, the special and standard tools and all other items.

R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 28-43-24Page 409 1201-213, 1May 01/05 1 1 1CES 1 TANK LEVEL SENSING - DESCRIPTION AND OPERATION

______________________________________________
 1. General
_______

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 The Fuel-Level Sensing-System (FLSS) gives:
 -high level sensing
 -low level sensing
 -full level sensing
 -underfull level sensing
 - overflow level sensing

 -temperature sensing
 -shut-off of fuel recirculation for Integrated Drive Generator (IDG) cooling
 -wing tank intercell fuel transfer control
 -center tank fuel pump control.
 **ON A/C 301-399,
 The Fuel-Level Sensing-System (FLSS) gives:
 -high level sensing
 -low level sensing
 -full level sensing
 -underfull level sensing
 - overflow level sensing

 -temperature sensing
 -shut-off of fuel recirculation for Integrated Drive Generator (IDG) cooling
 -center (transfer) tank to wing tank fuel-transfer control.
 **ON A/C ALL
 The system has level sensors that the Fuel Level Sensing Control Units (FLSCUs) monitor continuously. The sensors are installed at different positions in the fuel tanks to give fuel level data in the range low level to overflow. The FLSCUs supply a voltage to the sensors electrical resistive-element. When the voltage returns to the FLSCUs it is compared with a specified reference to find if the related sensor is 'wet' or 'dry'. The FLSS uses the fuel level data to:
 -control the operation of the refuel valves during refuel and fuel transfer when the aircraft is on the ground
 1EFF : ALL 1 28-46-00Page 1 1 1 Aug 01/05 1 1 1CES 1R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,

 -
make sure that the fuel level in the wing tank(s) does not increase above the full mark by fuel (from the center tank) that is returned from the engines via the recirculation system (Ref. 28-16-00).

 -
make sure that the fuel in the wing tank inner cells does not decrease to less than low level, when the wing tank outer cells contain fuel

 -give fuel low-level warnings to the Engine/Warning Display (EWD) (Ref. 31-66-00).
 **ON A/C 301-399,
 -control the operation of the transfer pumps when the center (transfer) tank is at low level
 -make sure that the fuel in the wing tanks does not decrease to less than 200 kg (440 lb) below 'full', when the center (transfer) tank contains fuel
 -give fuel low-level warnings to the Engine/Warning Display (EWD) (Ref. 31-66-00).
 **ON A/C ALL
 The system has temperature sensors that the FLSCUs continuously monitor. The FLSCUs supply a voltage to the sensors electrical resistive-element. When the voltage returns to the FLSCUs it is compared to a specified reference to find if the fuel adjacent to the sensor is "hot". The FLSCUs use the "hot" signal to control the operation of the fuel recirculation for the cooling system (Ref. 28-16-00). Logic within the FLSCUs convert the "hot" signal into a control signal for fuel recirculation. This signal is then transmitted to the Full Authority Digital Engine Control (FADEC) (Ref. 73-20-00) to control the operation of the Fuel Return Valve (FRV) (Ref. 73-10-00).
 2. Component Location
__________________
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 (Ref. Fig. 001)
 **ON A/C 301-399,
 (Ref. Fig. 001A)
 1EFF : ALL 1 28-46-00Page 2 1 1 Aug 01/05 1 1 1CES 1

 Tank Fuel Level Sensing - Component Location
　
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