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("AC ESS" Section on PDB) ................................PULL
b. AC RESET Switchlight........................................PUSH
c. RESET PILOT/COPILOT PHASE B and C CBs one at
a time. Allow sufficient time for fault to reoccur. AC
RESET switchlight will illuminate.
d. After fault isolation, leave applicable circuit breaker
pulled (OPEN).
e. AC RESET Switchlight........................................PUSH
2) If indications are abnormal (voltage and frequency drop):
a. Essential AC Bus E INV Switch .........................PUSH
b. PILOT/COPILOT PHASE A and ACCESS CBs
(“AC ESS” Section on PDB) ................................PULL
Continued on next page →
AC
RESET
SEL
AUTO LEFT
MAIN
RIGHT
MAIN
ON
E
INV
ESS AC BUS
Quick Reference Handbook
ABNORMAL / EMERGENCY PROCEDURES REVISION 7
Page EA - 16 May 30/02
Bus Fault - AC or DC RESET Light On, ctd… AFM 3-07-70
Essential AC Bus Fault Indicated, ctd…
c. Manual Pressurization ....................................SELECT
CAUTION: PULLING PILOT’S PHASE A CIRCUIT
BREAKER CAUSES LOSS OF AUTOMATIC PRESSURIZATION
CONTROL; ONLY MANUAL PRESSURIZATION
WILL BE AVAILABLE.
d. AC RESET Switchlight .......................................PUSH
e. Reset PILOT/COPILOT PHASE A and ACCESS CBs one
at time. Allow sufficient time for fault to reoccur.
f. After fault isolation, leave applicable circuit breaker
pulled (OPEN).
g. Essential AC Bus AUTO Switchlight...................PUSH
NOTE: If Pilot’s Phase A is not the fault, reset
pressurization to AUTO.
3. If RESET light remains on:
A. Power ................VERIFY AVAILABLE ON LEFT MAIN AC BUS
B. Essential AC Bus L Main Switchlight.................................PUSH
C. AC RESET Switchlight ......................................................PUSH
If AC RESET switchlight extinguishes, monitor voltage and
frequency for remainder of flight.
If AC RESET switchlight does NOT extinguish:
D. Power ............. VERIFY AVAILABLE ON RIGHT MAIN AC BUS
E. Essential AC Bus R Main Switchlight ................................PUSH
F. AC RESET Switchlight ......................................................PUSH
If AC RESET switchlight extinguishes, monitor voltage and
frequency for remainder of flight.
If AC RESET switchlight does NOT extinguish, continue:
G. Essential AC Bus E INV Switch.........................................PUSH
H. Monitor voltage and frequency for remainder of flight.
NOTE: All B and C Phase Essential AC Bus power is not
available.
Continued on next page →
Quick Reference Handbook
REVISION 7 ABNORMAL / EMERGENCY PROCEDURES
May 30/02 Page EA - 17
Bus Fault - AC or DC RESET Light On, ctd… AFM 3-07-70
Main AC Bus Fault Indicated:
NOTE: With a MAIN AC BUS unpowered, the corresponding CHGR FAIL
warning light will illuminate.
If LEFT MAIN AC BUS is unpowered:
1. Essential AC BUS RIGHT MAIN Switchlight ......................... PUSH
NOTE: If RIGHT MAIN AC BUS is unpowered, leave Essential AC Bus
in AUTO.
2. AC RESET Light.....................................................................PUSH
3. If RESET light extinguishes and power is restored to the bus:
A. If fault indication was the LEFT BUS, then:
Essential AC Bus AUTO Switchlight................................... PUSH
B. Monitor loads for remainder of flight.
4. If RESET light extinguishes momentarily, while bus cycles
through available sources, then re-illuminates:
A. Relevant AC Main Feeder Circuit Breakers (PDB).............PULL
B. AC RESET Switchlight ......................................................PUSH
C. RESET Main Feeder circuit breakers one at a time. Allow
sufficient time for fault to recur.
D. After fault isolation, then:
Applicable Circuit Breaker .................. LEAVE PULLED (OPEN)
E. AC RESET Switchlight ......................................................PUSH
F. If fault was the LEFT BUS, then:
Essential AC Bus AUTO Switchlight..................................PUSH
5. If RESET light remains ON:
A. Verify availability of power for failed bus by selecting Volt/Freq.
Meter to LEFT, RIGHT, and, if APU is running, AUX.
Continued on next page →
AC
RESET
SEL
AUTO LEFT
MAIN
ON
RIGHT
MAIN
E
INV
ESS AC BUS
CHGR
FAIL
Quick Reference Handbook
ABNORMAL / EMERGENCY PROCEDURES REVISION 7
Page EA - 18 May 30/02
Bus Fault - AC or DC RESET Light On, ctd… AFM 3-07-70
Main AC Bus Fault Indicated, ctd…
　
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