EDIATec ECW100 Manual de instruções - Página 12

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13. Operating Limitations

ECW100 is designed and built as a non-essential 'situation awareness only' unit to sup-

port the pilot, and cannot always provide reliable warnings. In particular, ECW100 does

not give any guidance on avoiding action. Under no circumstances should a pilot or

crewmember adopt different tactics or deviate from the normal principles of safe airman-

ship. The use of ECW100 is solely at the discretion of the commander and his delegated

crew member. Operation must be preceded by thorough familiarization by the command-

er or his delegated crew member with the Operating Manual.

ECW100 will only give warnings of other aircraft that are likewise equipped with a com-

patible unit. ECW100 does not communicate with Mode A/C/S transponders and is not

detected by ACAS/TCAS/TPAS or Air Traffic Control. Likewise ECW100 does not com-

municate with FIS-B, TIS-B or ADS-B.

Compatible units must be within range in order to provide a warning. The range is very

much determined by the type, installation and position of the radio antennae, plus the

relative positions of the two aircraft. Under optimum conditions the internal antennae can

give a head-on range of up to 5 km; normally, range is about 2 km, which is adequate

for light aircraft and sailplanes. The radio signals can only be received by line of sight.

There is no ECW100 signal between two aircraft on opposite sides of the same mountain.

ECW100 has to know its current position in order to operate. For this reason, ECW100

will only operate in the presence of good quality three-dimensional GPS reception. GPS

reception is greatly influenced by the installation and position of the antenna, and aircraft

attitude. This is particularly true during turns, when flying close to mountain slopes and

in areas known for poor reception. If the installation is poor the GPS signal quality may

be reduced. In particular, there can be rapid degradation of height calculations. ECW100

resumes operation as soon as the GPS reception quality is adequate.

Movements calculated by the GPS relate to a fixed system of terrestrial coordinates. In

strong wind there may be a substantial difference between aircraft heading and track,

leading to a distortion of the threat bearing. If the wind speed is one third of True Air-

speed (TAS) and the yaw-free aircraft Heading is 90° out of wind, then the threat indica-

tion displayed has an error of about 18°. If the wind is very strong, the Track can deviate

up to 180° from Heading. Under such circumstances and when circling, the calculation

and warnings given are unusable.

When close up, when two aircraft are at the same or similar height, or GPS reception is

poor, the vertical bearing indication is imprecise and fluctuates.

ECW100 calculates the predicted flight path of the aircraft to which it is fitted for less

than the next 30 seconds. This prediction is based on immediate past data, current posi-

tion- and movement data, plus a movement prediction model that is optimized for the

respective user. This forecast is associated with a number of uncertainties that increase

with an extension of the forecast time. There is no guarantee that an aircraft will actually

follow the predicted flight path. For this reason, the warning issued will not be accurate in

all cases. In sport flying flight path predictions of more than 30 seconds are unusable.

This is particularly true for sailplanes and hang gliders. For this reason, the radio range is

generally adequate.

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