Boeing 737 - LOSS OF BOTH ENGINE DRIVEN GENERATORS

737 Operations Manual
Non-Normal Checklists -
Electrical
Copyright © The Boeing Company. See title page for details.
NNC.6.4 D6-27370-400E-TBCE
LOSS OF BOTH ENGINE DRIVEN
GENERATORS
Condition: All TRANSFER BUS OFF, BUS OFF and GEN OFF BUS
lights illuminated indicate the loss of both engine
driven generators.
Note: At high altitude, thrust deterioration or engine
flameout may occur.
BUS TRANSFER SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . OFF
[Prevents high electrical loads during attempts to restore power.]
ELECTRIC HYDRAULIC PUMP SWITCHES . . . . . . . . . . . .OFF
[Prevents high electrical loads during attempts to restore power.]
ENGINE No. 2 GENERATOR SWITCH. . . . . . . . . . . . . . . . . .ON
ENGINE No. 1 GENERATOR SWITCH. . . . . . . . . . . . . . . . . .ON
If either or both BUS OFF lights remain illuminated:
Note: APU start attempts are not recommended above
25,000 feet.
APU (if available) . . . . . . . . . . . . . . . . . . . START & ON BUS
[With both buses off, only one start attempt is recommended. Multiple
start attempts reduce standby power capacity.]
Note: If the APU is the only operating generator, connect
it to the No. 2 bus, as it will power TR No. 3. If the
APU cannot be connected to No. 2 bus, connect it
to No. 1 bus.
If either or both BUS OFF lights extinguish:
BUS TRANSFER SWITCH . . . . . . . . . . . . . . . . . . . . . . AUTO
[Restores power to the remaining transfer bus if one BUS OFF light
remains illuminated.]
ELECTRIC HYDRAULIC PUMP
SWITCHES . . . . . . . . . . . . . . . . . . . . . .ON (ONE AT A TIME)
[Prevents high peak electrical loads.]
Continued on next page
December 06, 2002