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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