Cessna 150 STANDARD Service Manual page 245

NOTE
After accumulated test or 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.
16-79. REMOVAL AND INSTALLATION OF TRANS-
MITTER. (Refer to figure 16-11. )
a. Remove baggage curtain to gain access to the
transmitter and antenna.
b. Disconnect co-axial cable from end of transmit-
ter.
I
c. Depending upon the particular installation, either
cut four sta-straps and remove transmitter or cut
sta-strap securing antenna cable and unlatch metal
strap to remove transmitter.
NOTE
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 area and avoid redepositing of
grease. Wipe surface immediately with clean
dry cloth, do not allow solvent to dry on sur-
face. Apply Velcro #40 adhesive to each sur-
face in a thin even coat and allow to dry 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 press firmly together to insure intimate
contact. Allow 24 hours for complete cure.
d. To reinstall transmitter, reverse preceding
steps.
NOTE
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).
ICAur)ojll \
Ensure that the direction of flight arrows
(placarded on the transmitter) are pointing
towards the nose of the aircraft.
16-80. REMOVAL AND INSTALLATION OF ANTEN-
NA. (Refer to figure 16-11. )
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.
c. To reinstall the antenna, reverse the preceding
steps.
NOTE
Upon reinstallation of antenna, cement
rubber boot (14) using RTVI02, General
Electric Co. or equivalent, to antenna
whip only; do not apply adhesive to fus-
elage skin or damage to 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 case of the ELT. Refer to Cessna Avion-
ics Service Letter A V74-16 and figure 16-11.
16-81. REMOVAL AND INSTALLATION OF MAG-
NESIUM SIX (6) CELL BATTERY-PACK. (Refer to
figure 16-12. )
NOTE
Since replacement 6 cell magnesium battery-
packs are no longer available, when in-
service units require replacement, use the
4 cell lithium battery-pack. Refer to para-
graph 16-82.
ELECTRICAL
CONNECTOR
TRANSMITTER
C 589510-0102
BATTERY-PACK
C589510-0105
(6 Cell Magnesium)
Figure 16-12. Magnesium 6 Cell
Battery-Pack Installation
16-82. REMOVAL AND INSTALLATION OF LITHIUM
FOUR (4) CELL BATTERY-PACK. (Refer to figure
16-13.)
NOTE
Transmitters equipped with the 4 cell battery-
pack can only be replaced with another 4 cell
battery-pack.
Change 3
16-33