757
MAINTENANCE MANUAL

 B. Access
 (1)  
Location Zones
 410 No. 1 power plant
 420 No. 2 power plant

 (2)  
Access Panels
 413 Fan cowl panel (Left)
 414 Fan cowl panel (Right)
 423 Fan cowl panel (Left)
 424 Fan cowl panel (Right)

 C. Prepare for Test
 S 865-103
 (1)  
Supply electrical power (Ref 24-22-00).

 S 865-104

 (2)  
Remove the engine shutdown inhibit from the EICAS computer
 (Ref 31-41-00).

 NOTE: A 3 1/2 minute time delay will occur before any EICAS
____ messages is shown after the engine shutdown inhibit is removed from the EICAS computer.
 S 045-105
 WARNING: DO THE THRUST REVERSER DEACTIVATION PROCEDURE TO PREVENT THE
_______ OPERATION OF THE THRUST REVERSER. ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURY OR DAMAGE.
 (3)  
Do the Thrust Reverser Deactivation for Ground Maintenance procedure (Ref 78-31-00).

 S 015-106

 (4)  
Open the left fan cowl on the left or right engine. Obey the CAUTIONS for the Kevlar wrapping (Ref 71-11-04).

 D. Test - Left Engine TAI System (Fig. 501)
 S 865-107
 (1)  Open this circuit breaker on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tag:
 (a)  11C27, ENG ANTI-ICE LEFT (Without EROPS)
 11C27, ANTI-ICE ENG LEFT (With EROPS)

 S 035-108
 (2)  Disconnect the electrical connectors that follow:
 (a)  The high pressure switch
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757
MAINTENANCE MANUAL

 S 865-109
 (3)  Remove the DO-NOT-CLOSE tag and close this P11 panel circuit breaker:
 (a)  11C27, ENG ANTI-ICE LEFT (Without EROPS)
 11C27, ANTI-ICE ENGleft (With EROPS)

 S 865-110
 (4)  
Put the L ENGINE ANTI-ICE switch-light on the P5 panel in the ON position.

 S 865-111

 (5)  
Make sure the six EICAS circuit breakers on the P11 panel are closed.

 S 485-112

 (6)  
Put a jumper between pins 1 and 2 of the high pressure switch electrical connector. Make sure the EIACS message L ENG TAI VALVE message is shown on the EICAS display.

 S 085-113

 (7)  
Remove the jumper from pins 1 and 2 of the high pressure switch electrical connector.
　
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