757 MAINTENANCE MANUAL
(f) Push the left BUS TIE switch (P5), to the ISLN position.
1) Make sure these lights are on: a) The yellow ISLN light, in the left BUS TIE switch (P5). b) The left BUS OFF light (P5). c) The yellow OFF Light, in the L GEN CONT switch (P5).
2) Make sure these indications show on the EICAS display: a) L AC BUS OFF - (level B message) b) L BUS ISOLATED - (level C message) c) L GEN OFF - (level C message)
(g) Push the L GEN CONT switch (P5), to the ON position.
1) Make sure these lights are off: a) The OFF light, in the L GEN CONT switch (P5). b) The left BUS OFF light (P5). c) The ON light, in the EXT PWR switch (P5).
2) Make sure the yellow ISLN light, in the left BUS TIE switch stays on. 3) Make sure the L GEN OFF, or the L AC BUS OFF message does not show on the EICAS display. 4) Make sure L BUS ISOLATED shows on the EICAS display.
(h) Push the left BUS TIE switch (P5), to the AUTO position. 1) Make sure the ISLN light, in the switch goes off. 2) Make sure L BUS ISOLATED does not show on the EICAS
display.
J. Engine Shutdown
S 715-031
(1) Prepare to do the engine shutdown procedure:
(a)
Push the L GEN CONT switch (P5), to the ON position. 1) Make sure the OFF light, in the switch, is off.
(b)
Push the R GEN CONT switch (P5), to the ON position. 1) Make sure the OFF light, in the switch, is off.
(c)
Make sure the ON light, in the EXT PWR switch (P5), is off.
S 715-032
(2) Stop the left engine (Ref 71-00-00).
(a) Make sure the yellow DRIVE light, in the L GEN DRIVE DISC switch (P5), is on.
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757
MAINTENANCE MANUAL
(b)
Make sure the DRIVE light, in the R GEN DRIVE DISC switch (P5), is off.
(c)
Make sure the yellow OFF light, in the L GEN CONT switch (P5), is on.
(d)
Make sure the left BUS OFF light, stays off.
(e)
Make sure the L AC BUS OFF, the L GEN OFF, or the L GEN DRIVE indication does not show on the EICAS display.
S 715-033
(3) Stop the right engine (Ref 71-00-00).
(a)
Make sure the yellow DRIVE light, in the L (R) GEN DRIVE DISC switches (P5), are on.
(b)
Make sure these lights are on: 1) The yellow OFF light, in the L (R) GEN CONT switches (P5). 2) The yellow BUS OFF lights (P5).
K. Switch Check with External Power and APU Generator
S 715-034
(1) Do a check with the external power, and the APU generator:
(a)
Shutdown the APU if it is running (AMM 49-11-00/201).
(b)
Supply external power to the main ac buses (Ref 24-22-00).
(c)
Push the APU GEN switch (P5), to the OFF position. 1) Make sure the yellow OFF light, in the switch, is on. 2) AIRPLANES WITH FIELD OFF SWITCHES INSTALLED ON GENERATOR
FIELD AND HYDRAULIC CONTROL PANEL;
Make sure the white APU FIELD OFF light (P61), is on.
(d)
Set the selection switch, on the EICAS select panel (P9), to the AUTO position. 1) Make sure the APU GEN OFF message shows on the EICAS
display.
(e)
Push the APU GEN switch (P5), to the ON position. 1) Make sure the OFF light, in the APU GEN switch (P5), is off.
2) AIRPLANES WITH FIELD OFF SWITCHES INSTALLED ON GENERATOR FIELD AND HYDRAULIC CONTROL PANEL; Make sure the white APU FIELD OFF light (P61), is off.
3) Make sure APU GEN OFF does not show on the EICAS display.
(f) Start the APU (Ref 49-11-00).
1) Make sure these lights are off: a) The OFF light, in the APU GEN switch (P5). b) The two BUS OFF lights (P5).
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