Baker Avionics

Fair enough, so in your expert opinion, what caused this issue and why are most of the rest of the units produced working fine? Further, in the STC installation as a singe radio, the Transmit interlock is not used, you are correct. You will notice, by doing research that while it doesn't show in the manual it being hooked up, it also doesn't referenced being installed in a dual radio system especially with the KX155. This issue is widely known in the Avionics Industry, at least in the places I have been and the ways I have been taught. Several instances, especially with the KX155, it shows this problem and in every airframe, virtually. You do not have to believe me and can try and discount this advice, that is fine and I have heard this rhetoric before. That IS most likely the issue. You are right, it will not matter which radio is installed, but instead of discounting the advice, try installing that line, as it should be, and then try it. you will be happy with the results. I really don't care what the bench test equipment says. I've been doing this way too long from big iron to part 23. It is what it is. I want to let everyone know that this is not in haste or with any bad emotion, I am as cool as the other side of the pillow on this. I just want to help.

My thought is that when the Avidyne was installed the KX155, the Transmit Interlock wire probably wasn't installed and when transmitting on the KX155, because the IFD is so sensitive in RX mode, it was getting pumped directly into the RX portion of the IFD. Now the damage probably has been done. It is a real issue as the 530 and 430 series of "Big G" had the same issue and numerous times, shops that do not know what they are doing do not connect that wire and it ruins the units. Just FYI. We actually are sending a flying clubs 430 in because they had this problem and had "A shop" that installed the #2 radio numerous times and just tried to adjust the squelch and sensitivity instead of installing that wire. Now the receive is weak and garbled/noisy and unreadable. Hmmmmmmmm

I bet I can get trade in value for an IFD Series from Avidyne. Should I run it past them? Anyone interested? I was talking to them until about 830 last night about things like this.

Can you send the configurations of the GNS530 and the G5 to me?

We swear by it out here and virtually all Aspen Installations we advise them to go with it strictly for situational awareness and as a fallback should your existing main display for traffic fail, Either way, it is nice to have right in front of you and if you do not want to see it on the Aspen, turn it off. Bada Boom Bada Bing!!!

Scotty is great! Such a great craftsman and person. Just love him and Wendy!!! And we're from the West Coast!!!

Who's doing that for you, Scotty and the crew at Precision?

No worries, just wanted you to be sure you are legal and all. Not trying to bust anyone's chops.

Ok....just understand that it doesn't give that option in the Garmin STC Installation Manual: 8.3.2 Regulatory Tests With the transponder operating in Normal mode and in an airborne state (refer to Section 8.1.1), the following regulatory tests are required to be performed. The Altitude Reporting Equipment Test is required to be performed for each altitude source interfaced to the transponder, including the GAE. These regulatory tests require the use of a Mode S transponder ramp tester, such as an Aeroflex IFR-6000 or TIC TR-220. Specific instructions for operating the ramp tester are contained in the applicable operator's manual. 1. Altitude Reporting Equipment Tests in accordance with 14 CFR Part 91.411 and Part 43 Appendix E. 2. ATC Transponder Tests and Inspections in accordance with 14 CFR Part 91.413 and Part 43 Appendix F. Because you are installing the GAE, and in general, something that is requiring altitude reporting equipment, it is necessary to perform a 91.411 as well because of it for initial certification. Just be careful Richard, trying to help out as a 30 year Avionics Guy that has done a bunch of these. It is required bottom line. It doesn't give you any lateral variance.

Richard, did you have a 91.411/413 done at the same time? I believe it needs it when you install the 335. Just want to make sure you are taken care of.

shoot it to me when you find it please?

That is exactly what it is. It needs to be set to a certain setting and maybe needs a software update as well. They recently, a year ago or so, did an update to the 430W/530W to alleviate these issues with the G5s

Still available?

The installation manual calls for a 91.411 and 413 check to be completed per the STC, correct? Oh and you are not allowed, per the manual, to use RG58. RG400/142 is required. 4.1.5 GPS/SBAS Antenna Cable Installation Installation approval for the GPS antenna is not supplied through this STC. Refer to Section 4.7.1 for GPS antenna installation guidance. This section provides information on the GPS antenna cable installation. NOTE GPS/SBAS antenna cable loss must be between 1.5 dB and 6.5 dB in order to maintain proper rejection of interference signals. If RG-142B or RG-400 is used, it must be between 6.5 and 35 feet long to meet the cable loss requirement. For longer lengths, use low-loss double or triple-shielded, 50 Ω coaxial cable. It is permissible to temporarily locate the GPS antenna with a coaxial cable connected to the GNX 375 and check the GPS performance as described in Section 6.4.3. Once the antenna mounting position has been established, route the coaxial cable from the antenna to the GNX 375. Proper selection of coaxial cable and assembly of connectors is critical to GPS signal performance. An acceptable connector used to connect the coaxial cable to the GPS/SBAS antenna is listed in Table 4-2. Table 4-2 GPS Antenna TNC Connector Item Amphenol P/N Connector, TNC, Male, Crimp 31-4452 Additional loss from coaxial connectors and adapters, such as TNC to BNC, should be considered when computing cable loss. A typical loss of 0.2 dB can be used for each connection. To maintain integrity of the 190-02207-A4 GNX 375 Part 23 AML STC Installation Manual Rev. 4 Page 31 SBAS signal, the GPS antenna coaxial cable must have a minimum of two shields (e.g., RG-400 or RG-142B). For very short runs, where the loss is less than 1.5 dB, additional cable should be used to increase the loss to within 1.5 dB and 6.5 dB. This additional cable may be coiled, taking into account the minimum bend radius of the cable. During the post-installation checkout, susceptibility to harmonics of VHF COM transmitters will be evaluated. If problems arise, then better isolation, or distance, may be required between the GPS and COM antennas, or a 1575.42 MHz notch filter (Garmin P/N 330-00067-00) may be installed in series with the antenna coax of the VHF COM transceiver to reduce or eliminate the harmonic interference. 4.1.6 Transponder Antenna Cable Installation for GNX 375 NOTE The maximum dB loss allowed from the transponder antenna to the GNX 375 is 2.0 dB. Installation approval for the transponder antenna is not supplied through this STC. Refer to Section 4.7.2 for GNX 375 transponder antenna installation guidance. This section provides information on the transponder antenna cable installation. As shown in Table 4-3, RG-400 or equivalent cable must be used and meet the permitted attenuation requirements (with connectors). When cable loss is calculated, refer to Table 4-4 for loss at each connection. 6.5 Ground Check – Transponder Performance 6.5.1 Regulatory Tests With the transponder operating in an airborne state by placing it in Ground Test mode (refer to Section 5.4.5), the following regulatory tests are required to be performed. The Altitude Reporting Equipment Test is required to be performed for each altitude source interfaced to the transponder, including the GAE. These regulatory tests require the use of a Mode S transponder ramp tester, such as an Aeroflex IFR-6000 or TIC TR-220. Specific instructions for operating the ramp tester are contained in the applicable operator's manual. 1. Altitude Reporting Equipment Tests in accordance with 14 CFR Part 91.411 and Part 43 Appendix E. 2. ATC Transponder Tests and Inspections in accordance with 14 CFR Part 91.413 and Part 43 Appendix F. It shouldn't be extra and be sure to have them identify IF there are leaks and issues prior to the installation. Just between us chickens

Where are you "purchasing" the GNX375 and then choosing where to have it installed?

Did that help out?

You are correct, partly, a Certified Repair Station can also approve one as well.

Shoot me an email and I have one for you!!!

Absolutely! Either way, it is wrong!!!

Looks great Jesse! We are in the process of 2 ourselves along with another line of Aspens, nose to tail.

Do yourself a favor, first of all. Go to your Avionics Shop, or if you are doing your own installation, either way.....pull the carpet out!!!! That is a travesty in my opinion. I would write my techs up for this!!!!!!

He did. Thought you would have known

Got him the STC manual!

So then why post like you are making a huge uncovering of King Tut's Tomb? This company you brag about is advertising for Cirrus which you CAN short cut things like antenna mounting in the exterior. Just trying to make a point here. I agree with you about mo excuses though. Kudos!

Email will be ok for the manual?