John Raatz wrote: Does anyone have a PDF version for the VHF-251 or VIR-351? I have an actual paper Collins manual for these. as thick as a large city phone book. $50 shipped, has fold out schematics and all kinds of service bullitens too. Complete service manual. Kurt. Section: Install Appliance, "Mount to Cabinet" 5.Slide the appliance all the way into place. Section: Install Appliance, "Mount to Cabinet" 6.Fasten the appliance to the cabinet opening with the screws supplied. Section: Install Appliance, "Mount to Cabinet" Always read and follow the complete installation instructions contained in this Description Installation kit for Collins- IND-350A/B or IND-351/A/B VOR/ILS indicator . Contents of this kit include mil spec connectors, contacts, and metal hood. Detailed list of what is included in this kit- 1 pcs- DSUB recept 25 pos, (same as Collins pn 371-0379-070) 25 pcs- ms39029/63-368 sockets (same as Collins pn 371-379-0170) The Comm radios are VHF-251, and the Nav radiosare VIR-351. Comm Radios. There are 2 sets of concentric knobs. On the left, the inner knob is a Power/Vol control. Full anti-clockwise turns the unit off. If this knob is pulled out, the squelch is defeated, allowing marginal reception or for the volume to be set. The outer knob is a 3 position S-Tec VIR-351 Navigation Receiver Installation Section $ 4.95. Eaton Installation Manual (1) Funke (5) Garmin Installation/ Owner's Manual (50) Garmin Misc. Manuals (16) Garmin Pilot's Guide (43) Garmin Service/ Maintenance Manuals (20) Icom (10) Microair Manual (5) Narco (5) relay rack and install the mounting screws. Tighten firmly. This completes installation. 2.1.3 351R-2 RACK MOUNT. Installation of the equipment listed in paragraph requires that the front panel ot the equipment be removed in order to remove the trim ring. Refer to figure 4, and proceed as follows: QTY COLLINS PART NUMBER 343-0173- 313-0053 310 The The VIR-351 switching unit utilizes BCD and and 2x5 2x5 control logic. The The 2x5 runs straight from the switches to the rear connector. The nav unit uses BCD information for for itself. Piper Cherokee Warrior PA-28-151 & Warrior II & III PA-28-161 Maintenance Manual $13.95 Part # 761-539 $13.95 Piper Comanche Service Manual PA-24-180/250/260/400 v1998 Part # 753-516 This item is: Collins VIR 30 Install Manual. We answer questions and will provide many detailed photos, email us: altimeters@charter.net. Avionics Manuals,Collins,Collins VIR-30 Series,Aircraft Manuals. More Collins Manuals: Part Number Description Price (PUB) COL-75S-1 75S-1 Manual, New Original 29.00 (PUB) COL-75S-3/C Collins 75S-3 & 75S-3A manual radio 251 Manual VHF-251, Collins Avionics Divisions/Rockwell Internacional VHF-251, Collins Avionics Divisions/Rockwell Internacional Anatel 02748-08-04004 operating details The IND-351 has a plastic outer case, which tends to crack over time. This can disable the IND-351 until the case can be repaired (which is not always possible). We believe that the IND-351 offers a false economy over the IND-351A. The IND-351 uses two rectilinear meter movements, instead of pendulum, which makes it easier to read.