757 MAINTENANCE MANUAL
H. AIRPLANES WITH NO FIELD OFF SWITCHES INSTALLED ON GENERATOR FIELD AND HYDRAULIC CONTROL PANEL; Field Control Relay, for the L(R) IDG
S 715-067
(1) Do a check of the field control relay for the L(R) IDG:
(a)
Push the L GEN CONT switch (P5) to the OFF position. 1) Make sure the yellow OFF light in the switch, stays on.
(b)
Push the R GEN CONT switch (P5) to the OFF position. 1) Make sure the yellow OFF light in the switch stays on.
(c)
Make sure the ELEC/HYD page shows on the bottom EICAS display.
(d)
Make sure these indications show on the lower EICAS display:
1) For the left power channel,
AC-V = 0
FREQ = 0.
2) For the right power channel,
AC-V = 0
FREQ = 0.
(e)
Push the L GEN CONT switch (P5), to the ON position. 1) Make sure the OFF light, in the switch, goes off.
(f)
Make sure these indications show on the lower EICAS display:
1) For the left power channel,
AC-V = 115 | 5
FREQ = 400 | 5.
2) For the right power channel,
AC-V = 0
FREQ = 0.
(g)
Push the R GEN CONT switch (P5), to the ON position. 1) Make sure the OFF light, in the switch, goes off.
(h)
Make sure these indications show on the lower EICAS display:
1) For the left power channel,
AC-V = 115 | 5
FREQ = 400 | 5.
2) For the right power channel,
AC-V = 115 | 5
FREQ = 400. | 5
(i)
Push the L GEN CONT switch (P5) to the OFF position. 1) Make sure the yellow OFF light in the switch comes on.
(j)
Push the R GEN CONT switch (P5) to the OFF position. 1) Make sure the yellow OFF light in the switch comes on.
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757 MAINTENANCE MANUAL
(k) Make sure these indications show on the lower EICAS display:
1) For the left power channel,
AC-V = 0
FREQ = 0.
2) For the right power channel,
AC-V = 0
FREQ = 0.
I. Bus Tie Breakers, and Generator Circuit Breakers
S 715-030
(1) Do a check on the field control relay, for the L (R) IDG:
(a)
Push the R GEN CONT switch (P5), to the OFF position. 1) Make sure the yellow OFF light, in the switch, stays on.
(b)
Push the L GEN CONT switch (P5), to the OFF position. 1) Make sure the yellow OFF light in the switch stays on. 2) Make sure these indications show on the EICAS display:
a) L GEN OFF - (level C message) b) R GEN OFF - (level C message)
(c)
Push the right BUS TIE switch (P5), to the ISLN position. 1) Make sure these lights are on: a) The yellow ISLN light, in the right BUS TIE switch
(P5). b) The yellow right BUS OFF light (P5). c) The yellow OFF light, in the R GEN CONT switch (P5).
2) Make sure these indications show on the EICAS display: a) R AC BUS OFF - (level B message)
(d) Push the R GEN CONT switch (P5), to the ON position.
1) Make sure these lights are off: a) The OFF light, in the R GEN CONT switch (P5). b) The right BUS OFF light (P5).
2) Make sure the yellow ISLN light, in the right BUS TIE switch (P5), stays on. 3) Make sure the R GEN OFF, or the R AC BUS OFF indication does not show on the EICAS display. 4) Make sure the R BUS ISOLATED indication shows on the EICAS display.
(e) Push the right BUS TIE switch (P5), to the AUTO position. 1) Make sure the ISLN light, in the switch, goes off. 2) Make sure the R BUS ISOLATED indication does not show on
the EICAS display.
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