Session 5 at SOAR by Avembsys

                       Hello everyone, session 5 at SOAR bagan at 2 pm. My dear friend Jawad explained the concepts of branching, looping and the importance of precedance of operators. Our techlead then took over the session and we had a brief discussion regarding our project.
                        The main topic of discussion was about AVIONICS which is otherwise known as aviation electronics. It is defined as, all electronics and electromechanical systems and subsystems (hardware and software) installed or attached to an aircraft. Avionics must be integrated in the conceptual design phase in the design of an aircraft.
                         We then discusssed about the avionics system requirements, i.e., safety, mission of the aircraft, life cycle cost and certification. Certification is a major factor in avionics design. Some of the important agencies around the world are the Federal Aviation Administration(FAA) in the United States, Directorate general of civil aviotion in india and others.
                          We then saw a picture of the different avionics placement on a multipurpose aircraft. It consisted of the following; GPS, military IFF(identify friend or foe),microwave landing system, weather radar, glide slope, avionics bay, marker beacon, DMF, VHF 2/military UHF, ATC transponder, TCAS(traffic collision avoidance system), radio altimeter, ELT, TACAN, FM broadcast, live tv, ADF(automatic direction finder), UHF SATCOM, C-band SATCOM and TCAS Dir.
                            The IFF is a critical part of an aircraft. If this does not function, there is a high probability that the aircraft can be shot down while flying over an enemy territory. Another interesting part is the live television at the back end of an aircraft, which is used to see the view outside an aircraft.
                            We then saw a live professional code. The interesting part of the code was how it was written from start to finish, the number of variables used and also the name assigned to any variable. It is important that the name of a variable is unique such that the programmer and the user knows what the variable is actually holding. We also saw the C-coding standards used while writing a professional code.
                              Next we discusssed about the Emergency Location Transmitter(ELT). This subsystem is triggered automatically on high impact or manually. ELT's emit distinctive tones 121.5, 243 and 406Mhz. These frequencies are monitored by search and rescue aircraft and by SASAT-COSTAS satellite. In case of an emergency where a pilot is not able to fly an aircraft, anybody can take over the plane and fly it by tuning it to 121.5Mhz frequency and recieving instructions from the ground.
                              The different regulatory and advisory agencies are as follows, ICAO, FAA, FCC, RTCA, ARINC, SAE, IEEE, JAA, EUROCAE, DGCA UK, DGAC France, DGCA India. The aircraft and its mission  drive the avionics system design. An example of the Avionics systems is the enhanced ground proximity warning system(EGPWS). It provides caution and warning to the pilot about the terrain around the aircraft so that the pilot can take necessary action.
                              The seven modes of EGPWS are as follows:
 MODE 1: excessive descent rate
 MODE 2: excessive closure to terrain
 MODE 3: altitude loss after take off
 MODE 4: unsafe terrain clearance
 MODE 5: excessive glideslope deviation
 MODE 6: advisory callout/bank angle
 MODE 7: windshear alerting

                               Finally discussed about the traffic collision avoidance system(TCAS) which includes traffic and resolution advisories. The TCAS symbols are non-threat traffic, proximity intruder traffic, traffic advisory and resolution advisory. With this another enthralling session came to an end.