Cessna 177 SERIES Service Manual

16-88.
EMERGENCY
LOCATOR
TRANSMITTER.
CAUTION
THRU 1977
MODELS.
Do not leave
the emergency
locator
transmitter
16-89.
DESCRIPTION.
The
ELT is
a self-contained,
in the ON
position
longer than
5 seconds
or
solid
state unit,
having
its own
power
supply,
with
an
you
may
activate
downed
aircraft
procedures
externally
mounted
antenna.
The
C589510-0209
trans-
by C. A.
P., D.
O. T. or
F. A. A. personnel
mitter
is designed
to transmit
simultaneously
on
dual
emergency
frequencies
of 121.5
and
243.0
Megahertz.
WARNING|
The 589510-0211
transmitter
thru
17702264
and the
C589510-0212 beginning
with 17702265
used for Canad-
Magnesium (6-cell)
battery-packs (excluding
ian registry,
operates
on 121. 5
only. The
unit is mount-
4 cell
lithium
battery-packs)
after prolonged
ed
in the tailcone, aft of
the baggage curtain on
the continuous
use (1 hour) in a
sealed environ-
right hand side.
The transmitters are
designed to
ment give off explosive
gas. If your ELT
provide a broadcast
tone that is audio modulated
in a has
operated for this time
period or longer,
swept manner over the range of
1600 to 300 Hz in a as a precautionary
measure, loosen the
distant, easily
recognizable
distress signal
for re-
ELT
cover screws,
lift the cover to
break
ception by
search and rescue
personnel
and others
air tight
seal and let
stand for 15 minutes
monitoring
the emergency
frequencies.
Power
is
before tightening
screws.
Keep sparks,
supplied to
the transmitter by a
battery-pack which
flames and
lighted cigarettes away
from
has the service
life of the batteries
placarded
on the
battery-pack.
batteries
and also on the
outside end of the transmit-
ter.
ELT's thru early 1974
models, were
equipped
NOTE
with
a battery-pack containing
six magnesium
'D"
size dry cell batteries
wired in series. (See
figure After
relatively short periods
of inactivation,
16-15)
Mid 1974 thru early
1975, ELT's
are equipped
the magnesium
(6-cell)
battery-pack
develops
with a battery pack
containing four "in-line"
lithium
a coating over its anode
which drastically
"D" batteries
wired
in series.
Early
1975 and on
reduces
self discharge
and thereby
gives
ELT's are equipped
with a battery-pack
containing
the cell an extremely
long storage life.
four lithium
'D" size batteries which
are stacked in
This coating
will exhibit a high resistance
two's
(See figure 16-15).
The ELT
exhibits line
of
to the flow of
electric current
when the
sight
transmission
characteristics
which correspond
battery is first
switched on.
After a short
approximately to 100
miles at a search altitude
of
while (less than 15 seconds),
the battery
10, 000
feet. When battery inspection
and replace-
current will
completely dissolve
this coating
ment schedules
are adhered to, the transmitter will
and enable the battery to operate normally.
broadcast
an
emergency
signal at
rated power
(75
If this
coating is
present when
your ELT
is
MW-minimum),
for a continuous period
of time as
activated, there may
be a few seconds delay
listed in the following
table.
before the transmitter reaches full power.
TRANSMITTER
LIFE
16-91. CHECKOUT
INTERVAL:
TO 75 MILLIWATTS
OUTPUT
100 HOURS.
6
Cell
4 Cell
Temperature Magnesium
Lithium a.
Turn aircraft master switch ON.
r Battery Pack Battergym Packt b. Turn aircraft transceiver ON and set frequency
_____Battery Pack Battery
Pack on receiver
to 121. 5 MHz.
+130°F
89 hrs
115 hrs
c. Remove
the ELT's antenna cable
from the ELT
+ 70°F
95 hrs
115 hrsunit.
- 4°F 49 uhrs95 hrs d. Place the ELT's function selector switch in the
- 40°F
23 hrs
70 hrs
ON position for
5 seconds or less. Immediately
re-
place
the ELT function
selector
switch
in the ARM
position
after testing
ELT.
Battery-packs
have a
normal shelf
life of five to ten
e. Test
should be conducted
only within
the time
(5-10) years and
must be replaced
at 1/2 of normal
period made up
of the first five
minutes after
any
shelf life
in accordance
with TSO-C91.
Cessna
hour.
specifies
3 years replacement
of magnesium
(6-cell)
AU
battery-packs
and 5 years
replacement
of lithium
CAUTIQN
(4-cell)
battery
packs.
Tests
with the
antenna
connected
should
be
16-90. OPERATION.
A three
position switch
on the
approved
and confirmed
by the nearest
control
forward end
of the
unit controls
operation.
Placing
tower.
the
switch
in
the ON
position
will energize
the
unit
to start transmitting
emergency signals.
In the
OFF
NOTE
position,
the
unit
is inoperative.
Placing
the
switch
in the ARM position
will set
the unit to start
trans-
Without its
antenna connected,
the ELT
will
mitting emergency signals
only after the unit
has produce
sufficient signal to
reach your receiver,
received a 5g (tolerances
are +2g and -Og)
impact yet
it will not disturb other
communications
force, for
a duration of 11-16
milliseconds.
or
damage output circuitry.
16-32
Change
7

Cessna 177 SERIES Specifications

General

Manufacturer	Cessna
Engine Type	Piston
Wingspan	35 ft 6 in (10.82 m)
Seating Capacity	4
Number Built	4, 295
Engine	Lycoming O-360
Horsepower	180 hp
Maximum Takeoff Weight	2, 500 lb (1, 134 kg)