CAB-30-02
Page 10
May 17, 2013
Caravan
SERVICE BULLETIN
CAB-30-02
(11) Continue the fluid purge until the panel is correctly purged in accordance with Figure 3 and
Table 2.
TABLE 2: PANEL PURGE FLOW TROUBLESHOOTING - WORK THROUGH TABLE AS NECESSARY
UNTIL THERE ARE CORRECT FLOW CHARACTERISTICS
Is there enough fluid in the test cart?
Add fluid to the test cart as necessary
Wipe leading edge with paper towel to even out the
fluid flow
If flow still uneven, use an approved procedure to
clean the dry spots
Are there correct flow characteristics for the porous
panel? If no,
Do the panel purge again
Does the fluid leave the test cart correctly? If no,
Repair or replace the test cart as necessary
Are there kinks or objects in the tubing that block the
flow? If yes,
Replace the tubing as necessary
Do a water panel purge as follows:
1.
Attach a water line to the water inlet port
and a shop air line to the air inlet port on the
purge cart
2.
Connect the purge tank lines to the panel
you will purge
3.
Turn the selector lever to the WATER position
on the purge cart
4.
Turn the water valve counterclockwise until
the pressure gauge shows 50 psi
5.
After water begins to flow from the panel, let
the water flow for 30 minutes
6.
Turn the purge cart selector lever to AIR
7.
Adjust the air pressure to 15 psi
8.
Purge the entire system with the air for 10 to
15 minutes to dry out the panels
Are there correct flow characteristics for the porous
panel? If still no,
Do the panel purge of the porous panel with the TKS
fluid again
Are there correct flow characteristics for the porous
panel? If still no,
Replace the porous panel
NOTE: To get an even flow over the panel it may be necessary to lightly run a dry cloth or
paper towel over the leading edge and/or the dry spots of the panel during purging.
(12) Make sure that there is no leakage at the tube connections and around the perimeter of the
panel.
(13) Stop the fluid supply.
(14) Wait until the fluid pressure is released.
(15) Slowly disconnect the test cart fluid supply tube from the left inboard wing porous panel.
(16) Install new sealing rings (two S2800-942 Sealing Rings) and connect the two left inboard wing
panel supply lines to ports 1 and 5 on the wing proportioning unit.
(17) Disconnect the center TKS panel supply line from port 2 on the wing proportioning unit.
