AVIONICS
low altitude awareness trip point. The radio altimeter also interfaces with TCAS, EGPWS and other systems as required. Interface with the Primus EPIC system is accomplished through the generic I/O modules in the MAUs.
Zero Altitude Adjustment
RT-300 Radio Altimeter R/T Unit
Central Maintenance System (CMS) From a maintenance perspective, the CMS on the AW-139 helicopter provides a reliable troubleshooting tool to help solve maintenance problems that may arise. The aircraft diagnostic and maintenance system (ADMS), provides a centralized
interface between the aircraft and the maintenance specialist. The ADMS is the next step to the capabilities previously provided by other computer assisted troubleshooting and maintenance systems. Overall the ADMS consists of two major parts. The first part is the central maintenance computer (CMC). This is a module located in the MAUs. It provides the central interface and collection point for maintenance messages and inquiries. The second part is the aircraft condition and monitoring function (ACMF). The ACMF collects and records aircraft data when certain specified events have occurred.
The CMS is a combination of the CMC and the LRUs/LRMs that make up the “member systems” of the aircraft.
Central Maintenance Aircraft
Diagnostic Philosophy Both AgustaWestland and Honeywell considered the following points in designing and implementing the ADMS on the AW-139 helicopter. • Information that does not contribute to the performance of effective maintenance should not be displayed.
• Maintenance messages displayed should identify the root cause of the problem.
• The syntax of the messages should be consistent and use simple terminology, keeping in mind that not all operators of the helicopter will have English as their primary language.
• Built-in-test (BIT) information should correspond to pilot reports/alerts. It is unacceptable to alert the flight crew of a fault without telling maintenance specialists what to do about it.
• The logic used to generate maintenance messages should include logic to eliminate cascaded faults.
• The maintenance operation should be simple and intuitive.
I hope that you have enjoyed our two-part overview of the Honeywell Primus EPIC system on the AW-139 aircraft. If you have any questions or would like to receive additional information on the AW-139 aircraft or the Honeywell Primus EPIC system, please contact AgustaWestland through its Web site at www.
agustawestland.com.
April | May 2015
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