(i)
(j)
(k)
(l)
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757 MAINTENANCE MANUAL
c) AIRPLANES WITH FIELD OFF SWITCHES INSTALLED ON
GENERATOR FIELD AND HYDRAULIC CONTROL PANEL;
The APU FIELD OFF light (P61).
2) Make sure the ON light, in the EXT PWR switch (P5), is on.
Push the APU GEN switch (P5), to the OFF position.
1) Make sure these lights are on:
a) The yellow OFF light, in the APU GEN switch (P5).
b) AIRPLANES WITH FIELD OFF SWITCHES INSTALLED ON
GENERATOR FIELD AND HYDRAULIC CONTROL PANEL;
The white APU FIELD OFF light (P61).
2) Make sure APU GEN OFF (level C message) shows on the EICAS
display after 5 seconds.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 APU FIELD OFF light (P61), is off. 3) Make sure the white ON Light, in the EXT PWR switch (P5),
is on. 4) Make sure APU GEN OFF does not show on the EICAS display.Push the EXT PWR switch (P5). 1) Make sure these lights are off:
a) The ON light, in the EXT PWR switch (P5).
b) The OFF light, in the APU GEN switch (P5).
c) The two BUS OFF lights (P5).
Push the APU GEN switch (P5), to the OFF position.
1) Make sure these lights are on: a) The yellow OFF light, in the APU GEN switch (P5). b) The yellow BUS OFF lights (P5). c) AIRPLANES WITH FIELD OFF SWITCHES INSTALLED ON
GENERATOR FIELD AND HYDRAULIC CONTROL PANEL;
The white APU FIELD OFF light (P61). 2) Make sure the ON light, in the EXT PWR switch, is off.Push the APU GEN switch (P5), to the ON position. 1) Make sure these lights are off:
a) The OFF light, in the APU GEN switch (P5).
b) The two BUS OFF lights (P5).
c) The ON light, in the EXT PWR switch (P5).
d) AIRPLANES WITH FIELD OFF SWITCHES INSTALLED ON
GENERATOR FIELD AND HYDRAULIC CONTROL PANEL;
The APU FIELD OFF light (P61).Push the EXT PWR switch (P5). 1) Make sure the white ON light, in the switch, comes on. 2) Make sure the OFF light in the APU GEN switch (P5) does not
come on.
3) Make sure these lights are off: a) The two BUS OFF lights (P5). b) AIRPLANES WITH FIELD OFF SWITCHES INSTALLED ON
GENERATOR FIELD AND HYDRAULIC CONTROL PANEL; The APU FIELD OFF light (P61).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL
L. Field Control Relay, for the APU Generator
S 715-035
(1) Do a check of the field control relay, for the APU generator:
(a)
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. 3) Make sure the APU GEN OFF (level C message) shows on the EICAS display, after 5 seconds.
(b)
Push the selection switch for the ELEC/HYD indication on (P61).
(c)
AIRPLANES WITH FIELD OFF SWITCHES INSTALLED ON GENERATOR FIELD AND HYDRAULIC CONTROL PANEL; Push the for the APU GEN FIELD switch (P61). 1) Make sure the FIELD OFF light, in the switch, goes off. 2) Make sure the yellow OFF light, in the APU GEN switch (P5),
stays on. 3) Make sure APU GEN OFF shows on the EICAS display. 4) Make sure the indications for the APU power channel shows
on the lower EICAS display: a) AC-V = 110 to 123 FREQ = 400 | 5
(d) AIRPLANES WITH FIELD OFF SWITCHES INSTALLED ON GENERATOR FIELD AND HYDRAULIC CONTROL PANEL; Push the APU GEN FIELD switch (P61). 1) Make sure the white FIELD OFF light, in the switch, comes
on. 2) Make sure the yellow OFF light, in the APU GEN switch (P5), stays on.
3) Make sure these indications for the APU power channel show on the lower EICAS display: a) AC-V = 0
FREQ = 0
(e) Push the APU GEN switch (P5), to the ON position.
1) Make sure these lights are off: a) The OFF light, in the APU GEN switch (P5).
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