AVIONICS
The radio modules are mounted in the pilot’s and co-pilot’s modular radio cabinets (MRCs).
Navigation Systems The navigation systems for the Primus EPIC system are quite diverse and range from the flight management system (FMS), to VHF radios and the air data system (ADS).
MRC and Module The radios are controlled from the multifunction control
display units (MCDU) located at the top of the center pedestal on the flight deck. The NAV radios can also be controlled from the PFDs using the CC-700 cursor control devices (CCD).
Flight Management System (FMS) The FMS has two primary functions and multiple secondary functions. The primary functions are position computation and flight planning. These functions work with the associated FD modes in both the lateral and vertical axes. The navigation database (NDB) contained in the FMS is essential to these functions. The data base is used to store waypoints, navaids, airways, procedures, airports and other navigation data. It is updated on a 28-day cycle. The FMS connects to a variety of short-range and long- range navigation sensors. The primary short-range sensors are AHRS, DME/DME and VOR/DME. The long-range sensor on the AW-139 is the global positioning system (GPS). Using the available sensors, the FMS develops a position based on a blend or mix of sensor inputs. Based on the position and the flight plan, the FMS generates information for display on the MCDU and EDS.
MCDU MCDU CCD
Indicating and Recording Systems In federated and integrated system architecture, many of the indicating and recording functions were accomplished by dedicated LRUs such as data acquisition units (DAUs) for engine data. The engine instruments are no longer individual LRUs, but are electronically displayed as part of the engine indicating crew alerting system (EICAS) display on the MFDs. The aircraft clock was also a standalone LRU, and in many instances system warning and failure events had their own indications on the dedicated failure/warning panel. In the Primus EPIC system on the AW-139, all of the functions above are tied together and reside on modules in the MAUs. The indications are shown on the PFD, MFD, EICAS or MCDU displays. There are still dedicated master caution/ warning lights situated in front of each pilot for particular system annunciations. These lights are tied into the aural warning system and also to the EICAS display.
MCDU Color Scheme For Primus EPIC, Honeywell has replaced the FMS control display unit (CDU) and radio management unit (RMU) with a multi-function control display unit (MCDU). In addition to control of the FMS, the MCDU controls radio tuning and the automatic flight information system (AFIS), with growth capability for control of communications navigation surveillance/air traffic management (CNS/ATM) functions. The FMS software is housed in processor modules in the MAUs.
The MCDU is a keyboard
control/display unit that provides keyboard entries for the FMS. It features a full-color active matrix liquid crystal display (AMLCD). It also has twelve line select keys to insert or change specific flight data and nine active function keys that provide direct access to specific pages within the FMS application.
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HelicopterMaintenanceMagazine.com April | May 2015
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