139 ILS and other faults
Interesting what you say about flying an offset iLS to the right of centreline. We had the same problem on one of our AW139s. We found the fault and its fixed now. Turned out to be the AHRS units! this particular machine had p/n 145130-1002 fitted both sides which caused the problem. All our other machines have p/n 142185-1105 which work fine on the ILS.
We swapped out both units with the different p/n; flew it down the ILS and works fine. Honeywell dont know why.
We also have the occasional yaw trim fail, switch off APs then back on and all is fine. MCDU #1 goes to backup or blanks on battery start, reset CB, an audio panel AV900 goes blank on battery start, reset CB etc etc. MCDU blanking fault caused by the #1 CSIO module which was replaced to fix an AP button nil operate so there ya go!!!
Also the main battery and aux battery current drain readings using ext power problem is caused by the CSIO modules. All our machines the main and/or aux toggle between 0 to -5amps. Sounds like its a calibration adjustment problem on the CSIO modules. If they had a damn preset pot to adjust I would be in there!
Yes Im not happy with Honeywell products either, particularly when one of our machines did an emergency landing at night in the pouring rain with the CAS lit up like a christmas tree indicating multiple failures. The MAUs had a gut full of water. Have since did the BT to move the vent hole from under the #2 MAU. Their circuit board conformal coatings dont sem to work to keep the moisture out as several cards were severly corroded.
We operate in Australia.