Multi Parameter Display and VSI
Multiparameter Display
The MPD is mainly divided by two parts. The left part where the vertical scales display the different values. From left to right the values are: transmission pressure, transmission temperature, engine oil pressure, engine oil temperature, fuel quantity and NG or gas generator speed.
On the right side, there is boxed values, starting from the left there is again the NG value. The two other boxes represent the values selected by a green colored light in the vertical scale below, that can be changed with the MPD Selector Switch.
There are also two separate lights and the MFD Backup button. The last displays at the top part of the MFD various labels with basic information of the aircraft status. On the other side, the light labeled by WRN will turn on every startup, if after resetting it by the Reset Switch just below it doesn’t turn off, the aircraft is due a revision, also a message on the boxes at the right side will notify the nature of the error. The light of the right side is nonfunctional.
The test switch is used to test all the lights under this section of the manual (MPD and Vertical Scale).
- Built In Test / Reset Switch
- Test Switch
- MPD Selector Switch
- Brightness rotator
- MFD Backup Button
Vertical Scale Instruments
The Vertical Scale Instruments (which includes the TGT/TRQ Dual Indicator) are lighted displays found on the Pilot Instruments side of the main dashboard. From left to right they display NR (Relative Rotor RPM), NP (Relative Engine Power), Turbine Gas Temperature and Torque. Two digital displays show the Turbine Gas Temperature and Torque values.
The scales have blue, green, yellow and red lit segments.
The blue segment will display if the instrument is operational.
The remaining segments will be lit as the value of each scale is passed, for example when NR passes 100% the segment between 100% and 101% will be lit.
Yellow and red segments represent precautionary areas and maximum operating limits respectively.
