SECTION 3
EMERGENCY PROCEDURES
SOCATA
MODEL TB 20
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socata
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June 30, 1988
Revision 8
3.17
Figure 3.1 – ALTERNATOR FAILURE DIAGRAM
NOTE: WHEN BUS 3 ”PULL–OFF” TYPE CIRCUIT BREAKER IS OPEN, LANDING GEAR
ELECTRICAL CONTROL BECOMES INOPERATIVE AND THE LANDING GEAR
MUST BE EXTENDED USING EMERGENCY SYSTEM
KEY :
CB : Circuit breaker
PCB : Pull–off type circuit breaker
SB : Switch–breaker
Switch off ”ALTr FLD” SB,
then ”ALTr” PCB
Open ”Bus 2” and ”Bus 3” PCBs
FAILING
SUCCESS
ALTERNATOR FAILURE
”ALTr” warning light
illuminated
CONTINUE
FLIGHT
LEAVE IMC CONDITIONS
USE FLASHLIGHT IF NECESSARY
LAND AS SOON AS POSSIBLE, USE EMERGENCY
LANDING GEAR EXTENSION SYSTEM IF REQUIRED
After switching off, try to
reengage alternator : ”ALTr FLD” SB
and ”ALTr” PCB, then ”Bus 2” and / or ”Bus 3” PCBs
NOTE : If closing of ”Bus 2” or ”Bus 3” PCB
makes ”ALTr” PCB or ”ALTr FLD” SB open,
pull faulty Bus PCB and close ”ALTr FLD” SB
Check alternator field ”ALTr
FLD” CB
Close ”ALTr FLD” SB and ”ALTr” PCB
Switch off alternator SB ”ALTr FLD”, then pull alternator PCB ”ALTr”
