glum, is this a maintenance test rig or a development and certification test rig?
For the latter I fear that you will struggle to find any operator’s notes or maintenance information specifically for that rig, as one of it functions was to create / evaluate such information.
Which rig do you have BAe 146 or Avro RJ?
IIRC there was an integration rig for the BAe 146 upgrade to EFIS – with analogue avionics (Arinc 400?). Then there was a similar one, possibly the same facility, for the Avro RJ.
For the RJ, the basic 146 flight deck structure was used, but the rig incorporated updated digital equipment (Arinc 700?), although some analogue interfaces were retained.
Most maintenance and return to service functions for the RJ were within the flight guidance computer and accessed / displayed via EFIS.
This rig was integrated with the aircraft systems rig which enable the autopilot to fly the aircraft control system, with electrics, hydraulics, etc, all functioning (the iron-bird). The iron-bird did have its own flight deck for controlling the aircraft systems, and enabled some rudimentary manual flight.
There was a large (at the time) supporting simulation computer (DEC?) which provided facilities for a Monte-Carlo analysis of the autoland performance.
The Avro RJ autoflight, EFIS, ADC, Rad Alt, and IRS were described in a stand alone document published by Honeywell; this was integrated with the manufacturer’s manuals.
The initial FMS was a GNS-X.
There was systems CBT package, I recall one being available on-line; also there was a complete rewrite of the crew manuals circa 2003-2005 which may be available electronically, but no idea where.