(3)
AIPC 73-21-80, Fig. 1
(4)
WDM 73-21-71, WDM 73-21-72, WDM 73-21-73, WDM 73-21-74
(5)
WDM 77-12-21, WDM 77-12-22
(6)
WDM 77-12-23, WDM 77-12-24
(7)
SSM 73-21-08, SSM 77-12-21
B.
Access
(1)
Location Zone 115 Area Between Nose Gear Well and Fuselage, LH
C.
Procedure
S 424-005-N00
(1)
Install the applicable engine speed card (AMM 20-11-22/401).
S 864-006-N00
(2)
For the applicable engine, close these circuit breakers and remove the DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel
1) 6K10 SPEED SENSOR ENG 1 1
2) 6K11 SPEED SENSOR ENG 1 2
3) 6K12 SPEED SENSOR ENG 2 1
4) 6K13 SPEED SENSOR ENG 2 2
5) 6K14 SPEED SENSOR ENG 3 1
6) 6K15 SPEED SENSOR ENG 3 2
7) 6K16 SPEED SENSOR ENG 4 1
8) 6K17 SPEED SENSOR ENG 4 2
D.
Do a test of the Engine Speed Cards.
S 864-008-N00
(1) Supply the electrical power (AMM 24-22-00/201).
S 864-022-N00
WARNING:_______MAKE SURE THAT YOU OPEN THESE CIRCUIT BREAKERS. IF YOU DO NOT REMOVE THE POWER FROM THE PITOT/STATIC, THE AOA, THE TAT AND THE ENGINE P2/T2 PROBES, THEY WILL BECOME HOT DURING THIS PROCEDURE. IF THE PROBES GET HOT, IT CAN CAUSE INJURIES AND DAMAGE TO THE EQUIPMWNT.
(2) Open these circuit breakers and install DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel
1) 6D34 PROBE HEAT IND LEFT
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
2) 6D35 PROBE HEAT IND RIGHT
S 864-023-N00
(3) For the applicable engine, open these circuit breakers and install DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel
1) 6H19 PROBE HEAT ENG 1
2) 6H21 PROBE HEAT ENG 2
3) 6H23 PROBE HEAT ENG 3
4) 6H25 PROBE HEAT ENG 4
S 864-009-N00
(4) Erase the EICAS maintenance page.
(a) Make sure the applicable ENG (X) SPEED CARD message is not
displayed.
S 864-010-N00
(5)
Move the channel 1 test switch on the N2 speed card to the TEST position.
S 864-011-N00
(6)
Make sure the applicable ENG (X) SPEED CARD message comes on after 70 seconds.
S 864-012-N00
(7)
Move the channel 1 test switch to the NORMAL position.
S 864-013-N00
(8)
Erase the EICAS maintenance page.
(a) Make sure the applicable ENG (X) SPEED CARD message is not
displayed.
S 864-014-N00
(9) Put the channel 2 test switch to the TEST position.
NOTE: Hold the channel 2 test switch in the TEST position.
____
S 864-015-N00
(10)
Make sure the applicable ENG (X) SPEED CARD message comes on after 70 seconds.
S 864-016-N00
(11)
Release the channel 2 test switch.
(a) Make sure that the switch goes back to the NORMAL position.
S 864-017-N00
(12) Erase the EICAS maintenance page.
(a) Make sure the applicable ENG (X) SPEED CARD message does not
come on.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 864-018-N00
(13)
Close the E/E access door.
S 864-024-N00
(14)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) P6 Main Power Distribution Panel
1) 6D34 PROBE HEAT IND LEFT
2) 6D35 PROBE HEAT IND RIGHT
