NOTE: If the test box for the PCU monitoring test is not
____ available, connect a 750-ohm, 10-watt resistor between pin 1 and pin 2 on the outboard PCA electrical connector.
 (e)  Erase the EICAS memory (AMM 31-41-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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757
MAINTENANCE MANUAL

 (f)  
Make sure that the L ELEV PCU message is not shown on the EICAS display.

 (g)  
Use the pogo rod compression tool to compress the pogo rod on the middle PCA 0.20 to 0.25 inches (5.1 to 6.4 mm).

 (h)  
Make sure that the L ELEV PCU message is shown on the EICAS display.

 (i)  
Remove the pogo rod compression tool from the middle PCA pogo rod.

 (j)  
Disconnect the outboard and inboard PCA connectors from the test box (or the resistors).

 (k)  
Attach the outboard and inboard PCA connectors to the PCAs.

 (l)  
Erase the EICAS memory (AMM 31-41-00/201).

 (m)  
Make sure that the L ELEV PCU message is not shown on the EICAS display.

 (n)  
Use the pogo rod compression tool to compress the pogo rod on the middle PCA 0.20 to 0.25 inch (5.1 to 6.4 mm).

 (o)  
Make sure that the L ELEV PCU message is shown on the EICAS display.

 (p)  
Remove the pogo rod compression tool from the middle PCA pogo.

 S 725-179
 (4)  
Do the steps that follow for the PCU monitoring of left inboard PCA test:

 (a)  
Disconnect the electrical connectors from the outboard and middle PCAs.

 (b)  
Attach the electrical connectors to the test box.

 NOTE: If the test box for the PCU monitoring test is not
____ available, connect a 750-ohm, 10-watt resistor between pin 1 and pin 2 at each PCA electrical connector (at the middle and outboard PCAs).
 (c)  
Erase the EICAS memory (AMM 31-41-00/201).

 (d)  
Make sure that the L ELEV PCU message is not shown on the EICAS display.

 (e)  
Use the pogo rod compression tool to compress the pogo rod on the inboard PCA 0.20 to 0.25 (5.1 to 6.4 mm).

 (f)  
Make sure that the L ELEV PCU message is shown on the EICAS display.

 (g)  
Remove the pogo rod compression tool from the left elevator inboard PCA.

 (h)  
Disconnect the outboard and middle PCA connectors from the test box (or the resistors).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A

757 MAINTENANCE MANUAL
 (i)  
Attach the outboard and middle PCA connectors to the PCAs.

 (j)  
Erase the EICAS memory (AMM 31-41-00/201).

 (k)  
Make sure that the L ELEV PCU message is not shown on the EICAS display.

 S 725-180
 (5)  
Do the steps that follow for the PCU monitoring of right elevator PCAs test:

 (a)  
Do the same procedure for the right elevator as you did for the left elevator except as follows: 1) Use the right side PCAs, not the left side PCAs 2) Look for the R ELEV PCU message, not the L ELEV PCU

 message.
 S 865-181
 (6)  
Erase the EICAS memory (AMM 31-41-00/201).

 S 215-182

 (7)  
Make sure that the L ELEV PCU message and the R ELEV PCU are not shown on the EICAS display.

 S 865-183

 (8)  
Keep the left, right, and center hydraulic systems pressurized for the elevator pressure bypass valve test.

 S.
Elevator Pressure Bypass Valve Test (Procedure 1)

 NOTE: Procedure 1 uses the pogo compression/extension tool.
____ Procedure 2 uses the tee and pressure gage. You can use procedure 1 or procedure 2 to test the elevator pressure bypass valve.
 S 865-341
 WARNING: MAKE SURE ALL HOLDING TOOLS AND OTHER OBSTRUCTIONS ARE REMOVED
　
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