During recent inspections of Dassault Falcon 7X aircraft, Duncan Aviation technicians have found corrosion on the electrical disconnect plugs in the wheel wells.
Airworthiness Directive 2010-07-02 is applicable to the Honeywell RNZ-850/851 Integrated Navigation Units (INU) and addresses possible erroneous glide slope or localizer display indications.
I highly recommend two Service Bulletins for L-3 Communications vertical gyros that will reduce vibration issues and result in better drift characteristics making the gyros more stable.
The Main Entry Door on Hawker aircraft is durable and very reliable. And by adding basic operational measures, you will ensure years of continued problem-free service.