757
MAINTENANCE MANUAL

BYPASS VALVE FOR LE SLAT PDU ACCESS PANEL
SEE A BYPASS VALVE FOR TE FLAP PDU
SEE B
MANUAL OVERRIDE
LEVER (SHOWN IN
USUAL NO. 2
POSITION)

AFT
BYPASS VALVE FOR LE SLAT PDU
MANUAL OVERRIDE
LEVER (SHOWN IN USUAL NO. 2 POSITION)
BYPASS VALVE FOR LE SLAT PDU
A
BYPASS VALVE FOR TE FLAP PDU B
TE Flap and LE Slat PDU Bypass Valves Figure 507
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 S 215-239
 (4)  Make sure the arming switches for the alternate drive of the TE flaps and LE slats on the P3 panel are not in the armed position (switch lights will go off).
 NOTE: You will need to put these arming switches in the armed
____ position for the LEADING EDGE light to come on when you do the FSEU-2 BITE test in the steps below.
 S 865-170
 (5)  
Make sure these circuit breakers on the overhead panel, P11, are closed.

 (a)  
EICAS (6 locations)

 S 865-191
 WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES WHEN
_______ HYDRAULIC POWER IS SUPPLIED. AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND STABILIZER ARE FULLY POWERED SURFACES. INJURY TO A PERSON OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC POWER IS SUPPLIED.
 (6)  
Pressurize the left hydraulic system (AMM 29-11-00/201).

 E.
Flap/Slat Electronic Unit (FSEU) - Test (-17 and lower FSEU's) (Fig. 506)

 S 715-147
 (1)  
Do the FSEU test that follows:

 (a)  
Push the BITE test switch for each FSEU and make sure all the lights on the panel face come on.

 (b)  
Release the BITE test switch for each FSEU and do the check that follows: 1) Make sure all the lights on the face panel go off. 2) Make sure that no fault indications occur. 3) Make sure the green test-complete light comes on for the

 end of the test. 4) Make sure the indications that follow come on momentarily in the sequence shown while BITE test is run:
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL

 FSEU-1
______
 INDICATION__________ LOCATION TRAILING EDGE LIGHT P3 LEADING EDGE LIGHT P3 TE FLAP DISAGREE UPPER EICAS SCREEN TE FLAP ASYM UPPER EICAS SCREEN LE SLAT DISAGREE UPPER EICAS SCREEN LE SLAT ASYM UPPER EICAS SCREEN FLAP LOAD RELIEF UPPER EICAS SCREEN FLAP/SLAT ELEC *[2] EICAS STATUS PAGE
 FSEU-2
______
 INDICATION__________ LOCATION TRAILING EDGE LIGHT P3 LEADING EDGE LIGHT *[1] P3 TE FLAP DISAGREE UPPER EICAS SCREEN TE FLAP ASYM UPPER EICAS SCREEN LE SLAT DISAGREE UPPER EICAS SCREEN LE SLAT ASYM UPPER EICAS SCREEN FLAP/SLAT ELEC *[2] EICAS STATUS PAGE
 FSEU-3
______ INDICATION__________ LOCATION FLAP/SLAT ELEC *[2] EICAS STATUS PAGE
 *[1]  The LEADING EDGE light will come on only if the LE slat alternate drive is armed (the switch light will be on) while the FSEU-2 BITE test is run.
 *[2]  The EICAS status page must be on for message to come on.
 F. Flap/Slat Electronic Unit (FSEU) - Test (-32 or -37 FSEU's) (Fig. 506)
 S 715-148
 (1)  
Do the FSEU test that follows:

 (a)  
Push the BIT TEST button on the front panel of each FSEU and hold for more than 1.5 seconds and make sure all 12 of the (LED) FSEU lights come on.

 NOTE: Do not push the BIT TEST BUTTON for different FSEU, at
____
 the same time.

 (b)  Release the BIT TEST button and do a check for past faults as follows: 1) Push the BIT TEST button one time after the other to see
 each column on the face panel.
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