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15. Descent To Below 15,000 Ft ..............................................................CONSIDER
16. Fuel Boost Pumps (All) ......CONSIDER SELECTION TO OFF TO CONSERVE
BATTERY POWER
05-07-72: Essential AC Bus Fault Indicated
1. AC RESET Switch Light..............................................................................PUSH
IF LIGHT EXTINGUISHES AND REMAINS OUT, PERFORM STEPS 2 THROUGH 5.
IF LIGHT EXTINGUISHES MOMENTARILY WHILE THE BUS CYCLES THROUGH
ITS POSSIBLE POWER SOURCES, THEN RE-ILLUMINATES, PERFORM STEPS 6
THROUGH 19.
IF LIGHT REMAINS ILLUMINATED, PERFORM STEPS 20 THROUGH 29.
IF LIGHT EXTINGUISHES AND REMAINS OUT:
2. ESS AC BUS AUTO Switch Light .....................................................VERIFY ON
3. Electrical Power.......................VERIFY ON L MAIN AC BUS (SOURCE LIGHT
ILLUMINATED)
4. ESS AC BUS LEFT MAIN Switch Light............................................VERIFY ON
5. Voltage ...............................................MONITOR FOR REMAINDER OF FLIGHT
IF LIGHT EXTINGUISHES MOMENTARILY WHILE THE BUS CYCLES THROUGH
ITS POSSIBLE POWER SOURCES, THEN RE-ILLUMINATES:
6. ESS AC BUS AUTO Switch Light .....................................................VERIFY ON
7. Essential AC Bus Voltage / Frequency...................................................CHECK
IF INDICATIONS ARE NORMAL:
8. PILOT / COPILOT φB / φC CBs (PDB, AC ESS Section)...........................PULL
OPERATING MANUAL
05-07-00 EXPANDED ABNORMAL / EMERGENCY PROCEDURES
Page 14
October 11/01
Revision 5
9. AC RESET Switch Light..............................................................................PUSH
10. PILOT / COPILOT φB / φC CBs .....................................RESET ONE AT A TIME
Allow sufficient time for fault to recur. AC RESET switch light will illuminate.
AFTER FAULT ISOLATION:
11. Applicable CB ...............................................................LEAVE PULLED (OPEN)
12. AC RESET Switch Light..............................................................................PUSH
IF INDICATIONS ARE ABNORMAL:
13. ESS AC BUS E INV Switch Light ...............................................................PUSH
14. PILOT / COPILOT φA / ACCESS CBs (PDB, AC ESS Section) ................PULL
15. Manual Pressurization ............................................................................SELECT
CAUTION
PULLING PILOT ΦA CIRCUIT BREAKER CAUSES
LOSS OF AUTOMATIC PRESSURIZATION
CONTROL; ONLY MANUAL PRESSURIZATION WILL
BE AVAILABLE.
16. AC RESET Switch Light..............................................................................PUSH
17. PILOT / COPILOT φA / ACCESS CBs...........................RESET ONE AT A TIME
Allow sufficient time for fault to recur.
AFTER FAULT ISOLATION:
18. Applicable CB ...............................................................LEAVE PULLED (OPEN)
19. ESS AC BUS AUTO Switch Light...............................................................PUSH
NOTE:
If PILOT φA is not the source of the fault, reset
pressurization to AUTO.
IF LIGHT REMAINS ILLUMINATED:
20. Electrical Power................................VERIFY AVAILABLE ON L MAIN AC BUS
21. ESS AC BUS LEFT MAIN Switch Light .....................................................PUSH
22. AC RESET Switch Light..............................................................................PUSH
IF AC RESET SWITCH LIGHT EXTINGUISHES:
23. Voltage / Frequency..........................MONITOR FOR REMAINDER OF FLIGHT
IF AC RESET SWITCH LIGHT DOES NOT EXTINGUISH:
24. Electrical Power ...............................VERIFY AVAILABLE ON R MAIN AC BUS
25. ESS AC BUS RIGHT MAIN Switch Light ...................................................PUSH
26. AC RESET Switch Light..............................................................................PUSH
IF AC RESET SWITCH LIGHT EXTINGUISHES:
27. Voltage / Frequency..........................MONITOR FOR REMAINDER OF FLIGHT
IF AC RESET SWITCH LIGHT DOES NOT EXTINGUISH, CONTINUE AS
FOLLOWS:
28. ESS AC BUS E INV Switch Light ...............................................................PUSH
OPERATING MANUAL
EXPANDED ABNORMAL / EMERGENCY PROCEDURES 05-07-00
Page 15
October 11/01
Revision 5
29. Voltage / Frequency..........................MONITOR FOR REMAINDER OF FLIGHT
NOTE:
All φB and φC Essential AC Bus power is not available.
05-07-73: Main AC Bus Fault Indicated
NOTE:
With a MAIN AC BUS unpowered, the corresponding
CHGR FAIL warning light will illuminate.
1. If LEFT MAIN AC BUS Is Unpowered: ESS AC BUS RIGHT MAIN Switch Light
　
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