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E. The BITE Test
S 745-004
(1) Do the BITE test:
(a)
Make sure the BAT switch (P5) is in the ON position.
(b)
Momentarily push the BIT switch on the BPCU (E5-3).
1) Make sure this indication sequence shows on the BPCU: a) EXTERNAL POWER SYSTEM b) OK c) LEFT GEN POWER SYSTEM d) OK e) RIGHT GEN POWER SYSTEM f) OK g) APU GEN POWER SYSTEM h) OK i) LAST FLT 00 END OF DATA j) FOR PREVIOUS FLT PUSH NOW
NOTE: The above sequence is shown when the power
____ system has no fault. If there is a fault, the applicable fault message will be displayed in place of the OK message.
2) Repair any message which is displayed on the BPCU.
3) If it is necessary to see this display again, stop until the FOR PREVIOUS FLT PUSH NOW indication goes off. Then, momentarily push the PERIODIC TEST switch.
F. The APU Generator Test
S 715-005
(1) Do the APU generator test:
(a)
Set the APU GEN switch (P5) to the OFF position.
(b)
Make sure this light is on: 1) The yellow OFF light in the APU GEN (P5).
(c)
Start the APU (AMM 49-11-00/201).
1) Make sure these lights are on: a) The yellow OFF light in the APU GEN switch (P5). b) The white ON light in the EXT PWR switch (P5).
2) Make sure the APU PWR HOT BUS WARN light on the P34 panel is off. 3) Set the switch for the EICAS computer (P9) to the AUTO position. 4) Push the switch for the ECS/MSG display (P61). a) Make sure the APU GEN OFF (level C-message) shows on the EICAS display. 5) Push the switch for the ELEC/HYD display (P61). a) Make sure these indications of the APU power channel
show on the EICAS display: b) AC-V = 0 c) FREQ = 0
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6) Push the APU GEN switch (P5) to the ON position. a) Make sure the OFF light in the switch goes off. b) Make sure these lights are on: c) The white ON light in the EXT PWR switch (P5). d) The red APU PWR HOT BUS WARN light (P34). e) Make sure these lights are off: f) The two BUS OFF lights (P5). g) Make sure these indications on the APU power channel
show on the EICAS display:
h) AC-V = 115 | 5
i) FREQ = 400 | 5
7) Push the switch for the ECS/MSG display (P61). a) Make sure APU GEN OFF does not show on the EICAS display.
8) Push the EXT PWR switch (P5). a) Make sure the ON light in the switch goes off. b) Make sure these lights are off: c) The OFF light in the APU GEN CONT switch (P5). d) The two BUS OFF lights (P5). e) Make sure these red lights are on: f) The APU PWR HOT BUS WARN (P34). g) The TIE BUS HOT BUS WARN (P34). h) The AC TIE BUS HOT BUS WARN (P31). i) The AC TIE BUS HOT BUS WARN (P32).
9) Push the APU GEN switch (P5) to the OFF position. a) Make sure these lights are on: b) The yellow OFF light in the APU GEN switch (P5). c) The two yellow BUS OFF lights (P5).
(d) Stop the APU (AMM 49-11-00/201).
1) Make sure the two yellow BUS OFF lights (P5) are on. a) Make sure these lights are off: b) The OFF light in the APU GEN switch (P5). c) The APU PWR HOT BUS WARN (P34). d) The TIE BUS HOT BUS WARN (P34). e) The AC TIE BUS HOT BUS WARN (P31).
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f) The AC TIE BUS HOT BUS WARN (P32).
S 745-006
(2)
Do the BITE test.
S 865-019 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 AMM 飞机维护手册 电源 ELECTRICAL POWER 1(51)
