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Dear LL:

All tray avionics will come with a tray as part of the kit. They will supply

enough pin connectors to interface with as many connections as you need at the

rear of the tray. I used a Century 2000 autopilot, it came with a tray and a

66% wired harness that you need to interface with HSI-VOR/OBS displays. Lots

of wires to match up for all the flag and indicator drivers. Probably best to

stick to one avionics brand primarily for aesthetics. You will be reading some

complex schematics.



All tray avionics will be 6 1/4" wide and a variable height. Note that the

height will be greater than the stacked trays, as the individual trays may be

shorter than the full height of the radio. Mock up the stack and leave a

0.032" spacer between the faceplates as a shim (discarded at final assembly,

of course). The face of the radio will usually be the highest part of the

unit: insure that they are level to each other by using a 1/4-3/8" wood shim

at the rear part. On the IV, make sure that you have enough depth for a given

instrument+connectors. The 3 1/8" hole mounted instruments mount at the face

but the long ones (HSI, GEM) will need some structural connection at the rear

as they are heavy.



Be especially careful of clearances for the deep instruments at the sides

where the panel is angled out, at the top because of the glareshield that

slopes down and finally at the aileron interconnect tubing at the very base of

the panel. I did all my avionics, prewired my radio stack, then the cables to

the HSI and Horizon and intercom. Do as much as you can before placing in the

plane. Do subunits, leave wires to be connected longer than you possibly think

you will need.



Robert Forest

N295P