(e)  
Signals to other aircraft systems.

 (5)  
FSEU-3 performs alternate flap and slat drive control. Specific functions are:

 (a)  
Alternate electric drive motor control.

 (b)  
Signals to other aircraft systems.

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757 MAINTENANCE MANUAL
E5 EQUIPMENT RACK  E5-1
SEE  A 
M10331 FSEU-1, 
SEE  B 
FORWARD CARGO DOOR BSEE M10333 FSEU-3, 
M10332 FSEU-2, 
SEE  B 
(AFT VIEW) E5 EQUIPMENT RACK E5-3 E5-2  OUTBD 
A 
FSEU BIT INSTRUCTIONS 
G  G  G 
321 ACTIVE CHANNEL FSEU FSEU FLAP SLAT FSEU LINK DATA DATA LINK DATA LINK SLAT AUTOAUTO SLAT LEFT LEFT FLAPFLAP RIGHT RIGHT FLAPFLAP LEFT LEFT SLATSLAT RIGHT RIGHT SLATSLAT FLAP LVR  A A A A  A A A A  TEST BIT TEST G COMPLETE 
NAMEPLATE 
FSEU (EXAMPLE) 
B  1 
Flap/Slat Electronic Unit Figure 13 (Sheet 1) 

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MAINTENANCE MANUAL

Flap/Slat Electonic Unit
Figure 13 (Sheet 2)

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MAINTENANCE MANUAL

Flap/Slat Electronics Unit Block Diagram
Figure 14 (Sheet 1)

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MAINTENANCE MANUAL

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Flap/Slat Electronics Unit Block Diagram
Figure 14 (Sheet 3)

A
757
MAINTENANCE MANUAL

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 (6)  
Built in Test Equipment (BITE)

 (a)  
The FSEU BITE system electrically tests the FSEU and interfacing electronic components. BITE software is designed to isolate faults in the electronic system down to the line replaceable unit level.

 (b)  
The BITE test is activated by pressing a switch on the front of each FSEU box. The BITE test is self terminating and the results of the test are shown on the FSEU front panel.

 (c)  
Activation of BITE test causes TRAILING EDGE and LEADING EDGE lights to illuminate and EICAS messages to print on EICAS display successively per following table as a check of the availability of the lights and the EICAS messages.
　
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