911 - 4
Page Date: 19. February 2014
Section 911
BECKER ATC 4401 Transponder
Pilot´s Operating Handbook US
EXTRA 330LX
911.1.1
CONTROLS AND INDICATORS
911.1.2
SWITCHING ON THE UNIT (PRE-FLIGHT CHECK)
1 Check that the circuit breaker is set and switch on the aircraft power supply .
CAUTION
Do not switch on the transponder if the motors or engines are being started or shut down.
2 Using mode switch (A), switch the transponder from
OFF
to
SBY
. A test then follows automatically
for 3 seconds. The display is flashing with all digits and the unit is subject to a self-test
simultaneously.
A
T
L
A
/
N
O
/
Y
B
S
/
F
F
O
h
c
t
i
w
s
e
d
o
m
y
r
a
t
o
r
s
n
o
it
i
s
o
p
t
n
e
t
e
d
4
h
t
i
w
f
f
o
d
e
h
c
t
i
w
s
s
i
r
e
d
n
o
p
s
n
a
r
T
:
n
o
it
i
s
o
p
F
F
O
.
)
g
n
it
h
g
il
l
e
n
a
p
t
c
e
p
x
e
(
.
n
o
d
e
h
c
t
i
w
s
s
i
e
d
o
m
y
b
d
n
a
t
S
:
n
o
it
i
s
o
p
Y
B
S
.
n
o
d
e
h
c
t
i
w
s
s
i
A
e
d
o
M
:
n
o
it
i
s
o
p
N
O
.
n
o
d
e
h
c
t
i
w
s
s
i
C
+
A
e
d
o
M
:
n
o
it
i
s
o
p
T
L
A
B
h
c
t
i
w
s
g
n
i
d
o
c
y
r
a
t
o
R
,
s
n
o
it
i
s
o
p
s
t
n
e
t
e
d
8
h
t
i
w
e
l
b
a
t
o
r
y
l
s
u
o
u
n
it
n
o
c
d
l
e
if
y
a
l
p
s
i
d
e
h
t
m
o
r
f
r
o
s
t
i
g
i
d
e
d
o
c
4
e
h
t
f
o
e
n
o
n
i
r
o
s
r
u
c
e
h
t
f
o
l
o
r
t
n
o
C
C
h
c
t
i
w
s
g
n
i
d
o
c
y
r
a
t
o
R
s
n
o
it
i
s
o
p
s
t
n
e
t
e
d
8
h
t
i
w
e
l
b
a
t
o
r
y
l
s
u
o
u
n
it
n
o
c
.
7
o
t
0
m
o
r
f
s
t
i
g
i
d
e
d
o
c
e
h
t
g
n
it
t
e
S
D
n
o
t
t
u
b
-
h
s
u
p
t
n
e
d
I
T
D
I
n
a
f
o
n
o
i
s
s
i
m
s
n
a
r
t
e
h
t
s
r
e
g
g
i
r
t
s
i
h
t
C
+
A
e
d
o
M
d
n
a
A
e
d
o
M
n
I
8
1
.
x
o
r
p
p
a
r
o
f
e
d
o
c
y
l
p
e
r
A
e
d
o
M
e
h
t
o
t
l
a
n
o
it
i
d
d
a
e
s
l
u
p
m
i
n
o
it
a
c
if
it
n
e
d
i
C
L
e
h
t
f
o
e
n
il
m
o
t
t
o
b
e
h
t
n
i
s
r
a
e
p
p
a
"
t
d
I
"
e
m
it
s
i
h
t
g
n
i
r
u
D
.
s
d
n
o
c
e
s
.
y
a
l
p
s
i
d
E
y
a
l
p
s
i
d
C
L
e
n
il
-
2
:
)
e
n
il
p
o
t
(
n
o
it
a
c
i
d
n
i
e
d
o
C
.
e
l
b
i
s
s
o
p
e
r
a
7
7
7
7
o
t
0
0
0
0
m
o
r
f
s
e
d
o
C
:
)
e
n
il
m
o
t
t
o
b
(
n
o
it
a
c
i
d
n
i
e
d
o
M
"
"
.
d
e
y
a
l
p
s
i
d
s
i
"
"
Y
b
S
"
"
:
e
d
o
m
Y
B
S
e
h
t
d
e
y
a
l
p
s
i
d
s
i
"
"
T
D
I
"
"
y
a
l
p
s
i
d
e
h
t
n
i
s
r
a
e
p
p
a
"
"
n
O
"
"
:
)
N
O
(
A
e
d
o
M
"
"
.
n
o
it
c
n
u
f
n
o
it
a
c
if
it
n
e
d
i
e
h
t
f
o
n
o
it
a
r
u
d
n
i
t
h
g
i
e
h
(
l
e
v
e
l
t
h
g
il
f
e
h
t
,
t
n
e
s
e
r
p
s
i
e
d
u
t
it
l
a
d
il
a
v
a
fI
:
)
T
L
A
(
C
+
A
e
d
o
M
"
o
n
fI
.
s
r
a
e
p
p
a
)
t
f
0
0
1
4
2
=
"
"
1
4
2
F
"
"
.
g
.
e
(
F
y
b
d
e
d
e
c
e
r
p
)
t
f
0
0
1
f
o
s
p
e
t
s
y
a
l
p
s
i
d
l
e
v
e
l
t
h
g
il
f
e
h
T
.
d
e
y
a
l
p
i
d
s
i
"
"
-
Ñ
F
"
"
,
t
n
e
s
e
r
p
s
i
e
d
o
c
e
d
u
t
it
l
a
d
il
a
v
e
h
t
r
o
f
d
e
y
a
l
p
s
i
d
s
i
"
"
t
d
I
"
"
.
e
d
o
m
n
o
it
a
r
u
g
if
n
o
c
e
h
t
n
i
f
f
o
d
e
h
c
t
i
w
s
e
b
n
a
c
"
.
n
o
it
c
n
u
f
n
o
it
a
c
if
it
n
e
d
i
e
h
t
f
o
n
o
it
a
r
u
d
F
n
o
t
t
u
b
-
h
s
u
p
e
d
o
C
1
R
F
V
e
d
o
c
R
F
V
c
if
i
c
e
p
s
-
r
e
s
u
t
s
r
if
a
s
e
t
a
v
it
c
A
G
n
o
t
t
u
b
-
h
s
u
p
e
d
o
C
2
R
F
V
.
e
d
o
c
R
F
V
c
if
i
c
e
p
s
-
r
e
s
u
d
n
o
c
e
s
a
s
e
t
a
v
it
c
A
H
n
o
it
a
c
i
d
n
i
y
l
p
e
R
Y
L
P
E
R
.
y
l
p
e
r
r
e
d
n
o
p
s
n
a
r
T
a
s
l
a
n
g
i
s
e
l
g
n
a
i
r
t
e
h
T
J
n
o
t
t
u
b
-
h
s
u
p
e
r
o
t
S
O
T
S
n
i
s
e
g
n
a
h
c
r
o
s
e
d
o
c
R
F
V
c
if
i
c
e
p
s
-
r
e
s
u
s
e
r
o
t
S
e
d
o
m
n
o
it
a
r
u
g
if
n
o
c
e
h
t
Summary of Contents for 330lx
Page 2: ...Left blank intentionally ...