Removal And Installation Of Transmitter - Cessna 1969-1976 172 Series Service Manual

NOT E
c
TRANSMITTER
C 589510-0102
(placarded on the transmitter) are pointing
towards the nose of the aircraft.
After accumulated test o r operation time
equals 1 hour, battery-pack replacement
is required.
f.
Check calendar date for replacement of battery-
pack. This date is supplied on a sticker attached to
the outside of the ELT case and to each battery.
16-92. REMOVAL AND INSTALLATION OF TRANS-
MITTER.
a.
Thru 1973 Models remove baggage curtain to
gain a c c e s s to the transmitter and antenna.
b. Beginning with 1974 Models remove cover in the
extended portion of the baggage compartment to gain
access to the transmitter, remove s c r e w s securing
baggage compartment overhead cover and remove
cover to gain a c c e s s to the antenna.
(Refer to figure 16-13. )
C .
Disconnect co-axial cable from end of transmit-
d. Depending upon the particular installation, either
cut four sta-straps and remove transmitter o r cut
sta-strap securing antenna cable and unlatch metal
s t r a p to remove transmitter.
NOTE
I
ter'
Transmitter is also attached to the mounting
bracket by Velcro strips; pull transmitter to
free from mounting bracket and Velcro.
NOTE
To replace Velcro strips, clean surface thor-
oughly with clean cloth saturated in one of the
following solvents: Trichloric thylene, Ali-
phatic Napthas, Methyl Ethyl Ketone or En-
mar 6094 Lacquer Thinner. Cloth should be
folded each time the surface is wiped to pre-
sent a clean a r e a and avoid redepositing of
grease. Wipe surface immediately with clean
d r y cloth, do not allow solvent to d r y on s u r -
face. Apply Velcro #40 adhesive to each s u r -
face in a thin even coat and allow to d r y until
quite tacky, but no longer transfers to the
finger when touched (usually between 5 and
30 minutes). Porous surfaces may require
two coats. Place the two surfaces in contact
and p r e s s firmly together to insure intimate
contact. Allow 24 hours for complete cure.
e. To reinstall transmitter, r e v e r s e preceding
steps.
NOT E
An installation tool is required to properly
secure sta-straps on units installed with
sta-straps. This tool may be purchased
locally or ordered from the Pandiut Cor-
poration, Tinley Park, Ill., part number
GS-2B (Conforms to MS90387-1).
16-92A. REMOVAL AND INSTALLATION O F
ANTENNA. (Refer t o figure 16-13.)
a. Disconnect co-axial cable from base of antenna.
b. Remove the nut and lockwasher attaching the
antenna base ot the fuselage and the antenna will
be
free for removal.
steps.
c. To reinstall the antenna, r e v e r s e the preceding
NOTE
Upon reinstallation of antenna, cement
rubber boot (14) using RTV102, General
Electric Co. or equivalent, to antenna
whip only; do not apply adhesive to fus-
elage skin or damage t o paint may result.
In-service 6 cell magnesium battery-pack
powered ELT's require the installation of
a
static electricity suppressor in the antenna
cable to prevent the possibility of damage to
the c a s e of the ELT. Refer to Cessna Avion-
i c s Service Letter AV74-16 and figure 16-13.
16-93. REMOVAL AND INSTALLATION OF MAG-
NESIUM SIX (6) CELL BATTERY-PACK. (Refer to
figure 16-14. )
NOTE
E LEC TR IC AL
BATTERY -PACK
/ L
CONNECTOR C589510-0105
(6 Cell Magnesium)
Figure 16-14. Magnesium 6 Cell
Battery- Pack Installation
16-94. REMOVAL AND INSTALLATION OF LITHIUM
FOUR (4) CELL BATTERY-PACK.
(Refer to figure
16-15.)
Ensure that the direction of flight a r r o w s
16-34 Change 3