Does Your Primus II Transponder Erroneously Go Into Standby?

June 2010

Ever have your Primus II Communication unit (RCZ) transponder erroneously going into standby mode? It often occurs if the flight crew takes longer than five seconds when using the rotary knob of the radio management unit to change the ATC code. Honeywell has issued an Airworthiness Directive that addresses this issue.

AD 2006-19-04 was issued to prevent the transponder of the COM unit from going into standby mode, which could increase the workload on the flight crew and result in improper functioning of the traffic alert and collision avoidance system.

AD 2006-19-04 Part Conversion
From	To
7510700-725	7510700-724
-763	-761
-765	-764
-813	-814
-815	-816
-825	-824
-863	-873
-875	-876

The AD is a simple process that requires new software for the XS-85X transponder module and installation of new Product, ID and Mod plates to the RCZ COM unit for future quick reference that the AD has been complied with.

Best of all, if this is the only work required for your unit, the AD is covered under Honeywell warranty. For more information about the Honeywell warranty, contact a Components Solutions Tech Rep.

Component Solutions Tech Reps

Cable, Jerry - Accessory Tech Rep - Lincoln, NE (LNK). Aviation professional since 1991. Airframes: Astra, Challenger, Citation, Embraer, Falcon, Gulfstream, Hawker, Learjet, King Air, Global, Westwind Hydraulic equipment and pumps, Pneumatic valves, Wheel and Brake, Emergency Power Supplies, Electric Motors, Mechanical Actuators, Landing Gear and Accessory Components and Systems Specialist. Direct: +1 402.479.8112 Mobile: +1 402.432.0154

Campbell, Curt - Avionics Tech Rep - Lincoln, NE (LNK). Aviation professional since 1975. Airframes: Challenger, Hawker, Learjet, King Air, Global Air Data Computer, Auto Pilot Systems, EFIS, Roll Modules, Mode Couplers and Selectors, Static Inverters, Servos, Spoiler System, Tool Calibration Lab, Flight Guidance Computer, Cabin Displays, and EFD Components and Systems Specialist. Direct: +1 402.479.4220 Mobile: +1 402.416.8832

Magnus, Dan - Avionics Tech Rep - Lincoln, NE (LNK). Aviation professional since 1976. Airframes: Citation, Embraer, Gulfstream, Hawker, King Air ADF, Comms, Control Heads, CVR, DME Gables Control Heads, Receivers, Nav-Comm/Receivers, Radar Systems, GPS, GNS, Transponders and UNS Components and Systems Specialist. Direct: +1 402.479.4217 Mobile: +1 402.416.1870

McKenzie, Scott - Avionics Tech Rep - Lincoln, NE (LNK). Aviation professional since 1995. Airframes: Citation, Falcon, Hawker, Learjet Direct: +1 402.479.4212 Mobile: +1 402.730.9383

Troyer, Larry - Avionics Tech Rep - Lincoln, NE (LNK). Aviation professional since 1982. Airframes: Astra, Falcon, Hawker, King Air, Westwind Air Data Computer, Auto Pilot Systems, EFIS, Roll Modules, Mode Couplers and Selectors, Static Inverters, Servos, Spoiler System, Cabin Displays, and EFD Components and Systems Specialist. Direct: +1 402.479.4219 Mobile: +1 402.416.8835

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