N853PA – Part 3

28th October 2010

The leading edge clean up continued into week two. The porous panels were all dry fit and trimmed and we began electrical work and installing brackets for interior equipment.

Porous panels after trim and fit.
Brackets on the belly inside the cargo pod.

Patches were applied where the pneumatic boot feed lines used to come through the leading edges of the wings and tail surfaces.

Patch on the right inboard wing.

The entirety of the materials that would be installed were laid out and categorized.

A majority of the installation kit.
TKS equipment pallet

The picture above is of the equipment pallet for the Caravan. The tank holds 20.8 gallons of TKS fluid. There are 5 filters, two main pumps and two windshield pumps. The side of the pallet has a sight glass with float ball to provide the crew visual confirmation of the fluid level. A ‘Minimum Dispatch’ indicator line shows the flight crew where the ball must be above to allow take off into known icing conditions. The 11.7 gallons this line indicates is enough to allow 45 minutes of operation in the High mode.

Sight glass with Minimum Dispatch quantity indicator.
Fluid Tank Sight Gauge (left hand side of cargo pod, below left lift strut)

Fluid is supplied to the panels and propeller by a positive displacement, constant volume metering pump. The two-speed pump provides two flow rates to the panels and propeller. The low speed supplies fluid for the design point of anti-icing during a maximum continuous icing condition. The high speed doubles the flow rate for removing accumulated ice or providing ice protection for more severe conditions. Flow rates are designed for this level of performance, regardless of the certification basis for the system.

The main pumps.

The fluid that is pumped from the equipment pallet flows through the five micro filters which assure all contaminants are removed from the fluid, preventing panel blockage. From the filters the fluid flows through nylon tubing to proportioning units in the wings and tail.

A proportioning unit for one of the wings.

The proportioning units divide the flow into the volumetric requirements of each panel or device supplied through the unit.

Learn More About TKS for the Beechcraft Bonanza