beechman35
New Member
- Joined
- Apr 16, 2007
- Messages
- 4
Hi,
I really need some serious technical assistance with this one. We recently installed a D10 system with remote mag sensor and temp probe as a backup in a 1967 Cessna 210. We installed the mag sensor just aft of the main gear wheel wells with the temp probe under the belly about 4 feet aft of the gear bay. We carried out the heading system cal and all appeared ok and errors within limits. We then flew the aircraft and saw heading errors of up to 30 degrees. We worked it out that the main gear legs were magnetised for whatever reason, so, pulled the legs, demagnetised them, test flew again. No difference. Still 30 degree errors. We then moved the sensor right down the tail making sure we were clear of beacon wiring and nav light wiring. Ground cal looked good, still errors in the air. We then moved the sensor out into the R/H wing tip area, about 3 feet inboard of the tip and moved the temp sensor to under the R/H wing to fuse fairing. Ground cal good, errors of up to 20 degrees airbourne, AND indicated temperature errors which change in magnitude and direction on a day by day basis, but mostly positive, so this also upsets the TAS indication. All connections have been checked for security, looms checked for any damage, even rewired the sensor back to the D10 and the temp probe, still no joy.
PLEASE...... I need any ideas as to whats going on. My customer is going to kill me if we cant fix it and as you could imagine, I am sick of the ongoing cost to us for installing it and moving stuff to try and fix.
I really need some serious technical assistance with this one. We recently installed a D10 system with remote mag sensor and temp probe as a backup in a 1967 Cessna 210. We installed the mag sensor just aft of the main gear wheel wells with the temp probe under the belly about 4 feet aft of the gear bay. We carried out the heading system cal and all appeared ok and errors within limits. We then flew the aircraft and saw heading errors of up to 30 degrees. We worked it out that the main gear legs were magnetised for whatever reason, so, pulled the legs, demagnetised them, test flew again. No difference. Still 30 degree errors. We then moved the sensor right down the tail making sure we were clear of beacon wiring and nav light wiring. Ground cal looked good, still errors in the air. We then moved the sensor out into the R/H wing tip area, about 3 feet inboard of the tip and moved the temp sensor to under the R/H wing to fuse fairing. Ground cal good, errors of up to 20 degrees airbourne, AND indicated temperature errors which change in magnitude and direction on a day by day basis, but mostly positive, so this also upsets the TAS indication. All connections have been checked for security, looms checked for any damage, even rewired the sensor back to the D10 and the temp probe, still no joy.
PLEASE...... I need any ideas as to whats going on. My customer is going to kill me if we cant fix it and as you could imagine, I am sick of the ongoing cost to us for installing it and moving stuff to try and fix.