30
7 Other Functions
7.1 Acoustic and Optical Warnings
Acoustic Alarms:
The
ALPHA
MFD
has a special port for connecting to the Intercom (see section
2.3.3). The alarm, when sounded, consists of several short beeps. The beeps are
repeated every 30 seconds until the pilot switches the alarm off by pressing
>
ON/OFF
<.
Note: The instrument is not switched off during flight when pressing the
>ON/OFF< key!
Optical Alarms – MASTER Alarm:
Optical Alarms are always represented by flashing display fields. If e.g. an engine
temperature gets too high, the respective data field starts to flash. If the data field is
not activated, i.e. it is not displayed at the time of the alarm, the data field will
automatically be displayed. Up from Version 4.05 the ALPHA has an integrated optical
MASTER alarm which is placed in the left upper corner of the instruments panel, close
the “Bräuniger” Logo. It’s a flashing high power red light LED with 2 kind of alarms:
1. Fast flashing for STALL and VNE. This alarm cannot be switched off.
2. Slow flashing for other alarms. This flashing can be confirmed by pressing the
on/off button and quits the optical and acoustic alarm.
The following audio/optical alarms are implemented:
7.1.1 Stall-Alarm and VNE-Alarm
When the aircraft flies slower than the set stall speed (e.g. Vso) (adjusted in SET-Mode
6), or flies faster than the set maximum Speed Vne (adjusted in SET-Mode 7) an
acoustic alarm sounds. This sound (low frequency beeps) only stops when the stall
speed is exceeded or the Vne is falling short of. The alarm can not be switched off.
Below 44 km/h the stall alarm is not active.
7.1.2 Low Voltage
If the power supply of the aircraft drops below 12 V a single alarm sounds (several
beeps) through the Intercom. Additionally the real-time display alternates with the
voltmeter. This alarm is also activated, when the
ALPHA
ALPHA
ALPHA
ALPHA
MFD
switches over to the
back-up battery. In this case, the voltage of the back-up battery is displayed.
7.1.3 Low Fuel
If the fuel gets below the 10% reserve mark, a single alarm sounds through the
Intercom and the 10% bar starts to flash. If the fuel gets even lower, this critical
condition is signalled by the continuous repetition of alarm beeps in the Intercom.
Additionally all bars of the fuel display start to flash
7.1.4 Cable Breakage of Temperature Senders
If the system detects a cable breakage of a temperature sender, an audio/optical
alarm is sounded through the Intercom and the corresponding display field starts to
flash. The temperature read-outs are replaced by 3 dashes (---).
