Hawker Beechcraft (HBC) is superseding the P/N of my mixing valve from 3213788-1-1 to a 3213788-3.
What is the difference?
Can it be modified in the field?
Can I install it on any model Hawker?
The Switching Valve Part Number 3213788-1-1 is in the process of being modified to a 3213788-3. The difference is the new P/N is an improved thermal compensation device. It is currently being installed on production aircraft. HBC will soon release information allowing P/N 3213788-3 to be installed on the Hawker 750, 800 series, 850 and 950 variants.
Because there haven't been any documents released to support field level modification or repair and overhaul, this modification must only be performed by HBC and P/N 3213788-3 must be returned to HBC for repair and overhaul.
Written by Jerry Cable, Duncan Aviation Accessories Tech Rep