S

ShawnR

Well Known Member
Friend
I purchased a 9A in January and am just starting to get to know it. Waiting for the field to thaw, then dry, a check ride, and now the annual is due, I have not flown it yet. But in familiarizing myself with it the other day, I noticed that when I keyed the mic, the ammeter dropped to 38 amps! This plane had 2 icom A200's in it at one time, but one had been removed due to a blown circuit board and was not repairable. I am suspecting this one is heading the same direction. I asked Icom about it and their reply was too much current (should be 2.6 amps on transmit) and no parts are available. No further info. I am thinking I am just going to order a new A220, but was curious if anyone has seen this. Is this an A200 issue? I would suspect an installation issue such as bad antenna connection but for the sake of a discussion, thought I might post this.

Working on the 4 with the awesome access to the rear of the panel, I am dreading yanking out the old mounts and wiring from underneath, but, it looks like that is the only way to work behind the 9 panel. Will be starting the annual this week so I will get to really familiarize my self with the 9.

Did some circuits in a friends 9 last week (right seat). Quite a bit different more responsive than a C172 ...eek....:)
 
ShawnR said:
I am dreading yanking out the old mounts and wiring from underneath, but, it looks like that is the only way to work behind the 9 panel.
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My slider 9A has this issue. A huge pain. It pays to spend some time figuring out the ergonomics before diving under there. Very helpful to have a second person to hand you things, and extract you if necessary!

I’ve told my family they should bury me in my 9A with my head stuck under the panel, because that will likely be what killed me. 🤣
ShawnR said:
Quite a bit different more responsive than a C172 ...eek....
Click to expand...

True, but I don’t think you’ll have any real problems transitioning from a 172 to the 9. Just keep in mind two things: (1) you can actually overspeed the flaps (this is more of a theoretical problem in a 172) and (2) given its speed and relatively low weight, it’s capable of gaining altitude in cruise MUCH faster than a 172 or Cherokee.
 
ShawnR said:
I purchased a 9A in January and am just starting to get to know it. Waiting for the field to thaw, then dry, a check ride, and now the annual is due, I have not flown it yet. But in familiarizing myself with it the other day, I noticed that when I keyed the mic, the ammeter dropped to 38 amps! This plane had 2 icom A200's in it at one time, but one had been removed due to a blown circuit board and was not repairable. I am suspecting this one is heading the same direction. I asked Icom about it and their reply was too much current (should be 2.6 amps on transmit) and no parts are available. No further info. I am thinking I am just going to order a new A220, but was curious if anyone has seen this. Is this an A200 issue? I would suspect an installation issue such as bad antenna connection but for the sake of a discussion, thought I might post this.

Working on the 4 with the awesome access to the rear of the panel, I am dreading yanking out the old mounts and wiring from underneath, but, it looks like that is the only way to work behind the 9 panel. Will be starting the annual this week so I will get to really familiarize my self with the 9.

Did some circuits in a friends 9 last week (right seat). Quite a bit different more responsive than a C172 ...eek....:)
Click to expand...
The problem with high ammeter reading is related to the installation. I have seen this with other radios too.
When transmitting on the COM, there is a strong magnetic field around the RG400 antenna cable.
The ammeter has a shunt, creating a mV signal in proportion to the current.
It is important that the signal wire from the shunt has a shield, grounded in one end only.
Also there should be some distance between the signal wire and the antenna cable (RG400).

Good luck
 
Thanks Avanza. I was wondering if it could be an erroneous reading as the radio appears to work, although I have not checked for actual transmission. Just noticed this. I will check into those points.
 
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