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What I am trying to say is the heater is universal for both versions. The heater will have two sets of holes (.070) one set is used for P models, and the other set used for un-pressurized.
The holes for a pressurized aircraft are .050 from the center line of the part, .600 inches apart.
The un-pressurized aircraft has the top hole .100 from the center line (yes the front hole will look like a Mae West), and the lower hole is .150 from the center line, these holes are also .600 apart.
These dimensions are from the SE1230-7 template as described in ME75-6.
Installation will be using two #50 drill bits (supplied) that you will put in your existing holes, peel off the release paper from the back of the heater and slide down over the the two #50 bits which will align the heater to the aluminum pitot block. One wire from the heater will be RTV'd down the channel on the pitot block to the Thermo Disc temp controller, the other wire will connect to the aircraft blue power wire. Once this is completed you will leave the #50 bits in place, place RTV on the heater unit and install in the strut fairing. When the unit is installed in the strut fairing with the two screws, then the #50 bits will be removed. These instructions are what is described in the maintenance manual, and ME75-6 Replacement Procedure, and Figure 1, Pitot Head Replacement 337, F337, T337G, FT337G
So the long and the short of it, instead of making two different parts, all four of the .070 holes are incorporated into one part making it a universal fit when installed, RTV will seal the extra set of holes.
Dan
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