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Honeywell Primus II RM-850 to RM-855 RMU Upgrade Program Ending 12/31/2011

October 2011

Honeywell stopped production of the RM-850 Radio Management Units (RMU) in 2006. Then on November 8, 2010, Honeywell announced there may not be enough suitable replacement parts for these RMUs to be repaired. These units are now becoming unsupportable in both exchange and repair.

The RM-855 is a form, fit, function replacement for the RM-850, but does require a connector change. No STC is required.

The following aircraft will most likely have the RM-850 RMUs currently installed:

  • Lear 45
  • Jetstream 41
  • Sikorsky S-76B
  • Global 5000
  • Falcon 2000
  • Hawker 800A / XP
  • Hawker 900XP
  • Hawker 1000
  • Citation 560 Ultra and Excel
  • Citation 650
  • Challenger 601

A typical failure of the RMU is a bad CRT with missing or faded segments. This is an indication that a total screen failure is coming soon.

Incentive to act

The Honeywell Upgrade Program provides deep discount pricing in combination with a Trade-In Credit for returned RM-850s, working or not. As a bonus, Primus II RM-855s ordered before the end of this year will carry a 3-year warranty from date of installation.

Each installed RM-855 will be covered by a two-year Honeywell warranty, if installed by an Authorized Honeywell dealer. To schedule your RMU replacement, contact Duncan Aviation Component Solutions.