Textron Cessna 208B, Service Bulletin

Page: 16 / 34

CAB-30-02
Page 16
May 17, 2013
Caravan
SERVICE BULLETIN
CAB-30-02
(132)Install a new S2800-942 Sealing Ring and connect the vertical stabilizer TKS supply line
to the tailcone proportioning unit.
C. Complete the system operational test as follows:
(1) Make sure that the circuit breakers that follow in Table 3 are engaged:
TABLE 3
TKS CIRCUIT BREAKER REFERENCE DESIGNATOR
PRIMARY ANTI-ICE (HC003)
W/S ANTI-ICE (HC016)
BACKUP ANTI-ICE (HC015)
ENG INTFC (HI013)
(2) Make sure that conditions are in accordance with Table 4.
TABLE 4 INITIAL CONDITIONS
NAME POSITION
Ground Power Supply 28, +0.5 VDC or −0.5 VDC
External Power OFF
Battery (DC Power) Switch OFF
Fluid Control - Primary OFF
Fluid Control - Max Flow OFF
Fluid Control - Backup OFF
(3) Put a five-gallon bucket below the prop slinger. Put one blade of the prop vertical and down
and put the bucket under that blade.
(4) Add TKS fluid to the tank as necessary until the indicator in the sight glass is above the
minimum departure mark.
(5) Put the EXTERNAL POWER switch to the BUS position.
(6) Put the FLUID CONTROL PRIMARY switch to the HIGH position.
(7) Wait until the fluid starts to come out all the holes along the full length of the panel.
(8) Make sure that the fluid comes out of all of the panels and the propeller slinger.
NOTE: Actual fluid flow from the porous panels during this test will be different at different
times as the ambient temperature changes. If there is no indication of fluid flow on
one or more panels, that panel must be purged again.
(9) Turn the propeller until each blade (one at a time) is vertical and down and make sure that fluid
comes out of the feed tube at each blade.
(10) Put the FLUID CONTROL PRIMARY switch to the OFF position.
(11) Discard the TKS fluid from the buckets you collected it in during the fluid purge.
(12) Put the FLUID CONTROL PRIMARY switch to the HIGH position.
(13) Let the system operate for five minutes.
(14) Put the FLUID CONTROL PRIMARY switch to the OFF position.