SECTION 3
EMERGENCY PROCEDURES
SOCA
T
A
MODEL TB 20
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Contents
June 30, 1988
Revision 8
3.19
Figure
3.3
–
T
O
T
AL ELECTRICAL F
AILURE DIAGRAM
F
AILING
F
AILING
F
AILING
SUCCESS
SUCCESS
SUCCESS
NOTE
:
WHEN
BUS 3
”PULL
–
OFF
” TYPE CIRCUIT BREAKER
IS
OPEN, LANDING GEAR ELECTRICAL CONTROL
BECOMES
INOPERA
TIVE AND THE LANDING
GEAR
MUST
B
E
EXTENDED USING EMERGENCY SYSTEM
KEY
:
C
B
:
Circuit
breaker
PCB
:
Pull
–
off type circuit breaker
SB
:
Switch
–
breaker
Bus
:
Bus bar
Close Bus 2 PCB
CONTINUE FLIGHT
AL
TERNA
T
OR RESET
NOTE :
If closing of
”Bus 2
” or
”Bus 3
” PCB
makes
”AL
T
r”
PCB or
”AL
T
r FLD
” SB open,
pull faulty Bus PCB and close
”AL
T
r FLD
” SB.
CONTINUE FLIGHT
CAREFULL
Y
BA
TTER
Y F
AILURE
–
SEE FIGURE
3.2
–
–
LEA
VE
IMC CONDITIONS
–
IF
POSSIBLE, CONTINUE FLIGHT
IN
GOOD
CONDITIONS
OR LAND AS SOON AS POSSIBLE
–
EMERGENCY LANDING GEAR EXTENSION
T
O
T
AL ELECTRICAL F
AILURE
AL
TERNA
T
OR F
AILURE
–
SEE FIGURE
3.1
T
O
T
A
L ELECTRICAL F
AILURE
–
All electrical equipment inoperative
–
Opening of some CB
Switch
of
f
:
–
”
Main switch
” and
”AL
T
r FLD
” SBs
Open :
–
”
BA
T
” and
”AL
T
r FLD
” PCBs
–
”
Bus 2
” and
”Bus 3
” PCBs
SUCCESS
Close
”Main switch
” SB and
”BA
T
” PCB
Check
”AL
T
r
FLD
” CB
Close
”AL
T
r FLD
” SB and
”AL
T
r”
PCB
Close Bus 3 PCB
SUCCESS
Check
”AL
T
r
FLD
” CB
Close
”AL
T
r FLD
” SB and
”AL
T
r”
PCB
