S 845-174
(2)
Make sure these EICAS messages do not show:
(a)
OVHT ENG 1 NAC
(b)
OVHT ENG 2 NAC
(c)
OVHT ENG 3 NAC
(d)
OVHT ENG 4 NAC
(3)
Push the LSK next to <OTHER FUNCTIONS on the CMC main menu.
(4)
Push the LSK next to <INPUT MONITORING.
S 865-177
(5)
TO MONITOR THE ENGINE 1 OR 2 INPUT TO THE EIU;
Write in "E/034/270/00"
S 865-175
S 865-176
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747-400
MAINTENANCE MANUAL
(6) S 865-090TO MONITOR THE ENGINE 3 OR 4 INPUT TO THE EIU; Write in "E/034/271/00"
(7) S 865-178Push the LSK next to "-/--/---/--".
(8) S 745-179Make sure bit 23 (engine 1 overheat loop A) on the CMC input monitoring is set to zero.
(9) S 035-180Disconnect one of the leads (pin A and pin C) labeled loop A of the overheat detector element, TS684, on engine 1 (upper forward right hand side of the engine core).
S 745-122
(10)
Make sure bit 23 on the CMC input monitoring is set to one.
S 745-181
(11)
Make sure bit 24 (engine 1 overheat loop B) on the CMC input monitoring is set to zero.
S 035-182
(12)
Disconnect one of the leads (pin A and pin C) labeled loop B of the overheat detector element, TS684, on engine 1 (upper forward right hand side of the engine core).
S 745-183
(13)
Make sure bit 24 on the CMC input monitoring is set to one.
S 745-184
(14)
Make sure the EICAS message "DET FIRE/OVHT 1" shows.
S 435-185
(15)
Connect the loop A lead (pin A and pin C) to the overheat detector element, TS684, on engine 1.
(a) Tighten the nuts:
-
Pin A: 25 to 30 pound-inches(2.8 - 3.4 newton-meters).
-
Pin C: 20 to 25 pound-inches(2.3 - 2.8 newton-meteres).
S 435-186
(16) Connect the loop B lead (pin A and pin C) to the overheat detector element, TS684, on engine 1.
(a) Tighten the nuts:
-
Pin A: 25 to 30 pound-inches(2.8 - 3.4 newton-meters).
-
Pin C: 20 to 25 pound-inches(2.3 - 2.8 newton-meters).
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747-400 MAINTENANCE MANUAL
S 485-187
(17)
Install a jumper wire in loop A between pin A and pin C of the overheat detector element, TS684.
S 485-188
(18)
Install a jumper wire in loop B between pin A and pin C of the overheat detector element, TS684.
S 745-189
(19)
Make sure the caution EICAS message "OVHT ENG 1 NAC" shows.
S 085-190
(20)
Remove the jumper wire from loop A.
S 085-191
(21)
Remove the jumper wire from loop B.
S 745-192
(22)
Make sure the caution EICAS message "OVHT ENG 1 NAC" does not show.
S 915-193
(23)
If the test is necessary for engines 2, 3, or 4, do the test again one engine at a time.
(a) Make sure these conditions occur when you do a test on engine
2, 3, or 4: CMC INPUT MONITORING
~.............................................................
| ENGINE | EICAS MESSAGE | LOOP A | LOOP B |
...............................................................
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