2)  Make sure that MAN shows on the EICAS ECS synoptic page below the left outflow valve position indicator.

 (c)  
Hold the OPEN CLOSE switch on the CPCS selector panel to the CLOSE position. 1) Make sure that the left outflow valve position indicator on

 the ECS synoptic page moves to the fully closed position. 2) Make sure that the left outflow valve position indicator on the CPCS selector panel moves to the fully closed position. 3) Release the OPEN CLOSE toggle switch.

 (d)  
Hold the OPEN CLOSE toggle switch to the OPEN position. 1) Make sure that the left outflow valve position indicator on the EICAS ECS maintenance page is between 0.95 and 1.00. 2) Make sure that the left outflow valve position indicator on

 the CPCS selector panel is in the fully open position. 3) Release the OPEN CLOSE toggle switch.

 (e)  
Push the MAN L switch to the off position. 1) Make sure that the EICAS advisory message OUTFLOW VLV L does not show.

 2)  Make sure that AUTO show on the EICAS ECS synoptic page below the left outflow valve position indicator.
 S 715-068
 (3)  Make sure that the right outflow valve operates in manual mode:
 (a)  
Push the MAN R switch on the CPCS selector panel to ON. 1) Make sure that the EICAS advisory message OUTFLOW VLV R shows.

 2)  Make sure that MAN shows on the EICAS ECS synoptic page below the right outflow valve position indicator.

 (b)  
Hold the OPEN CLOSE switch on the CPCS selector panel to the CLOSE position. 1) Make sure that the right outflow valve position indicator

 on the ECS synoptic page moves to the fully closed
 position.
 2)  Make sure that the right outflow valve position indicator on the CPCS selector panel moves to the fully closed position.
 3)  Release the OPEN CLOSE toggle switch.
 (c)  Hold the OPEN CLOSE switch to the OPEN position.
 1)  Make sure that the right outflow valve position indicator on the EICAS ECS maintenance page is between 0.95 and 1.00.
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 21-31-00
 ALL  ú ú 12 Page 515 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 2) Make sure that the right outflow valve position indicator on the CPCS selector panel is in the fully open position. 3) Release the OPEN CLOSE toggle switch.
 (d)  Push the MAN R switch to the off position. 1) Make sure that the EICAS advisory message OUTFLOW VLV R does not show.
 2)  Make sure that AUTO shows on the EICAS ECS synoptic page below the right outflow valve position indicator.
 S 865-076
 (4)  Remove the electrical power, if it is not necessary
 (AMM 24-22-00/201).

 TASK 21-31-00-705-069
 6.  Functional Check of the Controller Analog Sensor for the Cabin Altitude_______________________________________________________________________ Display and Warning System__________________________
 NOTE: This is a scheduled maintenance task.
____
 A.  Equipment
 (1)  
Vacuum Source, 20-30 inches Hg

 (2)  
G21004-1 - Vacuum Harness, Cabin Pressure Controller

 B.  References
 (1)  AMM 24-22-00/201, Manual Control
 C.  Access
 (1)  Location Zone
 221/222, Control Cabin
 117/118, Electrical and Electronics Compartment

 D.  Prepare for the Test
 S 865-073
 (1)  Push the BARO control on the captain's and first officer's EFIS control panels. This will set the PFD barometer readouts to
 29.92 IN.
 S 485-074
 (2)  Connect the vacuum harness to the vacuum source and to the bayonet coupling on the face of each cabin pressure controller.
 (a)  Open the shutoff valve on the harness.
 E.  Do the Cabin Altitude and Warning Test
 S 715-072
 (1)  Monitor the EICAS display during a cabin altitude change:
 (a)  Push the MAN L and MAN R switches on the CPCS selector panel to ON.
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