SEE D C
YQNL001 YQNL003
FLIGHT COMPARTMENT
ENG BTL ENG BTL
R ENG OVHT a L ENG 1 DISCH a 2 DISCH a OVHT a
DISCH DISCH 12 12
RL IE GF HT
r Tr
STRUT OVERHEAT SWITCHES, S10194 THRU S10205 ENGINE FIRE CONTROL PANEL, M10443 (REF)
B D
Strut Overheat Detection System - Component Location
Figure 102
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26-12-00
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A
757 MAINTENANCE MANUAL
STRUT OVERHEAT DETECTION SYSTEM - ADJUSTMENT/TEST
_________________________________________________
1. General_______
A. This subject has two tasks. The first task is an operational test of the overheat detection system of the strut.
B. The second task is a system test of the overheat detection system of the strut.
(1) The system test increases the function of the operational test. The system test will make sure that all of the necessary operations of the system occur correctly.
TASK 26-12-00-715-001
2. Operational Test - Strut Overheat Detection System__________________________________________________
A. References
(1)
AMM 24-22-00/201, Electrical Power - Control
(2)
AMM 31-41-00/501, Engine Indication and Crew Alerting System (EICAS)
(3)
AMM 31-51-00/501, Warning System
(4)
AMM 33-16-00/501, Master Dim and Test
B. Access
(1)
Location Zones
119/120 Main Equipment Center
200 Upper Half of Fuselage
211/212 Flight Compartment
(2)
Access Panels
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 Test
S 865-002
(1)
Supply electrical power (AMM 24-22-00/201).
S 755-003
(2)
Make sure these systems operate:
(a)
EICAS (AMM 31-41-00/501).
(b)
Warning system (AMM 31-51-00/501).
(c)
Master dim and test system (AMM 33-16-00/501).
S 755-004
(3)
Make sure these circuit breakers on the overhead circuit breaker panel, P11, are closed:
(a)
11B20, FIRE DETECTION L ENGINE 1
(b)
11B21, FIRE DETECTION L ENGINE 2
(c)
11B22, FIRE DETECTION R ENGINE 1
(d)
11B23, FIRE DETECTION R ENGINE 2
(4)
Close the EICAS circuit breakers on the P11 panel.
S 865-005
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757 MAINTENANCE MANUAL
S 865-059
(5) Open these circuit breakers on the main power distribution panel, P6, and attach DO-NOT-CLOSE tags:
(a)
6C1, FUEL COND CONT L
(b)
6C2, FUEL COND CONT R
D. Do a Test of the Strut Overheat Detection System
S 865-006
(1)
Push the ECS MSG switch on the EICAS maintenance panel, P61.
S 865-007
(2)
Push and hold the ENG test switch on the pilots aft control stand, P8.
S 755-008
(3)
Make sure these indications occur:
(a)
The L and R ENG OVHT light, on P8, comes on.
(b)
The messages L and R ENG OVHT EICAS show on the top display.
(c)
The EICAS messages L and R STRUT OH DET 1 and 2 show on the bottom.
NOTE: Ignore EICAS messages that show up on the display, but
____ are not called out in the procedure.
(d)
The caution annunciation is heard.
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