757
MAINTENANCE MANUAL

 D. Do a Test of the Engine Turbine Cooling Overheat Detection System.
 S 865-012
 (1)  
Push the ECS MSG button on the EICAS maintenance panel (P61).

 S 865-013

 (2)  
Push and hold the ENG test switch, on the pilots aft control stand, P8.

 (a)  Make sure these indications occur: 1) The L and R engine fire warning lights, on the engine fire switches, come on. 2) The red FIRE fire light, on the captains instrument panel,
 P1-3, comes on. 3) The master WARNING lights, on the P7 panel, come on. 4) The L and R switch-lights for the engine fuel controls, on
 the quadrant control stand, P10, come on. 5) The fire bell is heard.
 S 755-014
 (3)  Make sure these EICAS messages show on the top display:
 (a)  
L ENGINE FIRE

 (b)  
R ENGINE FIRE

 S 755-051
 (4)  Make sure these EICAS messages show on the bottom display:
 NOTE: Ignore EICAS messages that show up on the display, but are
____
 not called out in the procedure.

 (a)  
L TURB OH DET 1

 (b)  
L TURB OH DET 2

 (c)  
R TURB OH DET 1

 (d)  
R TURB OH DET 2

 S 865-015
 (5)  Release the ENG test switch, on the P8 panel.
 (a)  Make sure these indication occur: 1) The L and R engine fire warning lights, on the engine fire
 switches, go off. 2) The red master FIRE light goes off. 3) The red master WARNING lights, on the P7 panel, go off. 4) The L and R switch-lights for the engine fuel controls, on
 the P10 panel, go off.
 5) The fire bell stops.

 S 755-016
 (6) Make sure these EICAS messages do not show on the top display:
 (a)  L ENGINE FIRE
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A

757 MAINTENANCE MANUAL
 (b) R ENGINE FIRE
 S 755-052
 (7) Make sure these EICAS messages do not show on the bottom display:
 (a)
L TURB OH DET 1

 (b)
L TURB OH DET 2

 (c)
R TURB OH DET 1

 (d)
R TURB OH DET 2

 S 865-017
 (8) Remove the electrical power, if it is not necessary (Ref 24-22-00).
 TASK 26-13-00-735-018
 3.  System Test - Engine Turbine Cooling Overheat Detection System______________________________________________________________
 A. References
 (1)
24-22-00/201, Electrical Power - Control

 (2)
31-41-00/501, Engine Indication and Crew Alerting System (EICAS)

 (3)
31-51-00/501, Warning System

 (4)
33-16-00/501, Master Dim and Test

 (5)
54-52-01/401 Strut Fairings

 B. Access
 (1)  
Location Zones
 119/120 Main Equipment Center
 200 Upper Half of Fuelage
 211/212 Flight Compartment

 (2)  
Access
 413, 423 L, R Fan Cowl Panel (Left)
 414, 424 L, R Fan Cowl Panel (Right)
 415, 425 L, R Fan Reverser (Left)
 416, 426 L, R Fan Reverser (Right)

 C. Prepare for the Test
 S 865-019
 (1)
Supply electrical power (Ref 24-22-00).

 S 755-020

 (2)
Make sure these systems operate:

 (a)
EICAS (Ref 31-41-00).

 (b)
Warning System (Ref 31-41-00).

 (c)
Master dim and test system (Ref 33-16-00).

 (3)
Remove the aft forward strut fairing (Ref 54-52-01).

 S 015-021
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