Cessna 172P Pilot's Operating Handbook And Flight Manual page 267

PILOT'S
OPER,ATING
HANDBOOK
SUPPLEMENT
11
EMER,GENCY LOCATOR,
TR,ANSMITTER (EI,T)
SUPPLEMENT
EMERGENCY LOCATOR
TRANSMITTER (ELT)
sEcTroN
I
GENERAL
The
ELT consists
of
a
solf-containod dual-frequency radio
transmitter
and
battery power supply,
and
is activated by
an
impact
of
5g
or more
as
may
be
experienced in
a
crash
landing.
The
ELT
emits
an
omni-directional
signal
on tho international distress frequoncies
of
121.ã
and
243.0
MHz.
(Some
ELT units in export airoraft transmit only on
121.5
MHz.) General
aviation
and
commorcial aircraft, the FAA,
and
CAP monitor
121'5
MHz'
and
243.0
MHz
is monitored by the
military. Following
a
crash
landing,
the
ELT
will
provide line-of-sight transmission up to
100
miles at
10,000
feet.
The
ELT supplied in
domestic
aircraft transmits
on both
distress frequen-
cies
simultaneously
at
?5
mw rated power output for
5O
continuous hours
in
the
temperature
ra,nge
of
-4oF
to
+131oF (-20oC
to
+55oC).
The
ELT unit
in
export aircraft transmits
on
121.5
MHz
at
25
mw
rated power
output for
50
continuous hours in
the
temperature
ra,nge
of
-4oF
to
+131oF
(-20'C to
+5õ'C).
The
ELT is readily identified
as a
bright
orange
unit
mounted on
the
right
hand
side of the baggage
compartmont
wall in
the
tailcone. To
gain
access
to
the
unit,
remove
the oover. The
ELT is operated by
a
control panel
at
the forward facing
end of
the
unit
(see
figure
1).
sEcTroN
2
LIMITATIONS
The
following information
must
be
presented
in
the
form
of
a
placard
located on the
baggage
compartment wall.
EMER,GENCY
LOCATOR TR,ANSMITTER
INSTALLED BEHIND THIS
COVER.
MUST BE
SER,VICED
IN
ACCORDANCE
WITH
FAR,91.52
30
May
1980
1of4