gerrychuck
Well Known Member
I am currently in the middle of (gradually) installing a used GRT HX efis. I have fabricated a mount for the AHRS behind the baggage compartment, and plan to mount the magnetometer on the shelf in the tail. Couple of questions for those who have gone before:
-What is the consensus on the magnetometer placement? I know some people have had difficulty with the mag in the tail and have gone to the wingtip, but others have had no problem in the back. The only wiring in the neighbourhood is a single cable running down the left side of the compartment to the elevator trim motor. Strobes and nav lighting is all in the wingtips, so no other electricals in the vicinity.
-What is the best mounting method for the mag? I have seen people using both brass screws (maybe difficult to source?) and velcro strips. Leaning toward the velcro at the moment, primarily to make fine tuning position adjustment easier.
-I bought a complete prebuilt harness from Steinair, which should make the wiring connections fairly simple, but....this means I have a harness with big serial connectors on both ends, making running the wires a bit of a challenge; needs a pretty big hole through anything it needs to penetrate, although I should be able to partially disassemble the connector to allow it to go through a relatively small hole without having to re-pin it. Any ideas on routing the wire harness from behind the baggage compartment up to the panel appreciated. My current idea is to cut a slot in the bottom of the flange that the back wall of the baggage compartment screws into, then run the cable inside the side covers through the baggage compartment, through the cover plate in the side bulkhead that sits right in front of the flat actuator mechanism, forward along the floor/sidewall junction through the cockpit, under the cover over the spar and control linkages, and out the front of that cover and up behind the panel. Whew. I am really trying to manage without drilling or cutting any new holes through anything remotely structural.
Thanks in advance for any thoughts.
-What is the consensus on the magnetometer placement? I know some people have had difficulty with the mag in the tail and have gone to the wingtip, but others have had no problem in the back. The only wiring in the neighbourhood is a single cable running down the left side of the compartment to the elevator trim motor. Strobes and nav lighting is all in the wingtips, so no other electricals in the vicinity.
-What is the best mounting method for the mag? I have seen people using both brass screws (maybe difficult to source?) and velcro strips. Leaning toward the velcro at the moment, primarily to make fine tuning position adjustment easier.
-I bought a complete prebuilt harness from Steinair, which should make the wiring connections fairly simple, but....this means I have a harness with big serial connectors on both ends, making running the wires a bit of a challenge; needs a pretty big hole through anything it needs to penetrate, although I should be able to partially disassemble the connector to allow it to go through a relatively small hole without having to re-pin it. Any ideas on routing the wire harness from behind the baggage compartment up to the panel appreciated. My current idea is to cut a slot in the bottom of the flange that the back wall of the baggage compartment screws into, then run the cable inside the side covers through the baggage compartment, through the cover plate in the side bulkhead that sits right in front of the flat actuator mechanism, forward along the floor/sidewall junction through the cockpit, under the cover over the spar and control linkages, and out the front of that cover and up behind the panel. Whew. I am really trying to manage without drilling or cutting any new holes through anything remotely structural.
Thanks in advance for any thoughts.