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· The crew heard the CB pop or observed a change in the associated aircraft,
system / warning light, which was previously normal but is now unpowered
as a result of the CB being out, or
· There is a previous logbook entry about the same CB being tripped in the
previous 3 calendar days, or
· There is any associated electrical smoke / smell, or evidence of overheating
of any aircraft system.
If any of the above conditions are noted, the crew should not reset the CB, but
instead enter the findings in the logbook and call maintenance for investigation
prior to departure.
(Continued)
737
Flight Manual
Continental
ELECTRICAL
Sec. 2.6 Page 3
Rev. 11/15/02 #41
After Block Out and Before Takeoff:
Any CB that is confirmed to have tripped, should not be reset by the crew.
The crew can continue the flight with the CB left in the tripped mode, provided
the affected system is not required as per the MEL, and all appropriate MEL
procedures are complied with. Also there must be no electrical smoke / smell,
or evidence of overheating of any aircraft system. In all cases a logbook entry is
required.
From Takeoff to Block In:
One reset of a tripped circuit breaker may be attempted after a cooling period
of approximately two minutes when:
· Called for during a published non-normal checklist or procedure, or
· At the discretion of the Captain, provided resetting the CB is necessary
for the safe completion of the flight.
Caution: If the circuit breaker trips again, do not attempt another reset.
In all cases a logbook entry is required.
Aircraft Logbook Entries:
All tripped circuit breakers regardless of phase of flight and whether reset or
not, must be written up in the aircraft logbook. This entry should include:
1. Time of occurrence (if known) in Z
2. Aircraft parameters when trip occurred (phase of flight, altitude /
airspeed)
3. Weather conditions if appropriate
4. Name of the CB
5. Location of the CB
6. Any pilot action that occurred prior to or during the trip sequence
7. Attempted reset and results
8. BCD Fault Reporting Manual (FRM) fault codes
Example:
“At 1408Z, during climbout, 15,000 MSL, 290 KIAS, VMC conditions,
the RT PITOT HT CB, location D-18, tripped open. Flight continued and
no reset of the CB attempted.
[FRM code 123-123-1] 2”
* * * *
ELECTRICAL
Sec. 2.6 Page 4
Rev. 11/15/02 #41
Continental
737
Flight Manual
>>@ CSD HIGH OIL TEMPERATURE
Temperature, Frequency, And Voltage ....................................CHECK
Temperature in caution range or at or above 157°C, check rise
temperature 20°C maximum, or voltage and frequency out of limits or
erratic.
IF Indications Normal:
Generator..........................................................................MONITOR
* * * *
IF Any Indication(s) Abnormal:
Gen Switch....................................................................................OFF
Monitor CSD temperature. If the temperature is above 157°C,
CSD should be disconnected.
Caution: CSD disconnect inflight is irrevocable.
CSD Switch................................................................DISCONNECT
Hold CSD disconnect switch for no more than 3 seconds.
APU ............................................................... START AND ON BUS
Yaw Damper...................................................................CHECK/ON
* * * *
OR
737
Flight Manual
Continental
ELECTRICAL
Sec. 2.6 Page 5
Rev. 11/15/02 #41
>>@ CSD LOW OIL PRESSURE
Light illuminated indicates a malfunction in the constant speed drive.
Frequency, Voltage, And Temperature ....................................CHECK
IF Indications Normal:
Generator..........................................................................MONITOR
* * * *
IF Indications Abnormal:
Caution: CSD disconnect inflight is irrevocable.
CSD Switch................................................................DISCONNECT
Hold CSD disconnect switch for no more than 3 seconds.
APU .....................................................................START & ON BUS
Yaw Damper...................................................................CHECK/ON
* * * *
BCD DRIVE
A generator DRIVE light illuminated indicates a malfunction in the related
generator drive.
Generator Drive Disconnect Switch......................................DISCONNECT
Hold in the DISCONNECT position momentarily.
APU (If Available)............................................................START & ON BUS
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