Classe Audio CP-500 - V2.8 Manuel de service télécharger pdf (Page 3)

PowerFLARM Device Manual for FW v2.00

Introduction

A PowerFLARM™ device draws its position and movement

information from an internal GPS-receiver. The position measured

is rendered more accurate by an integral pressure sensor. The

device calculates the predicted flight path and transmits this

information as a short, low-power digital signal burst at one-

second intervals together with a unique identification code. At the

same time, the device receives similar signals from PowerFLARM

devices installed in other aircraft and within radio range, or from

aircraft equipped with ADS-B-OUT (1090ES), Mode-C and Mode-S

transponders (if interrogated by ground radar or TCAS). The

device compares the signals received with its own projected flight

path. An optional, additional feature will be for the device to

compare its own projected flight path with the positions of known

fixed obstacles (e.g. cables, aerials, cable railways, avalanche

detonation sites) held in the device's data base.

If the device determines one or more threats of a dangerous

conflict with another aircraft or obstacle, it warns the user of the

most dangerous threat as per the internal calculation. Acoustic

warnings are issued via a warning bleeper and headset audio

output, also an optical warning via an LCD display. These signals

indicate the height of the threat, the direction from which it has

been detected, and the altitude difference. For gliders, during

thermalling, a different calculation algorithm is applied from that

used in straight flight. The GPS- and collision threat data received

are also fed to a serial data port output for use by other devices

such as an external display and PDA. Compatible equipment is

available from a number of suppliers.

Warnings are issued in accordance with the time remaining to a

possible collision, not the geometric distance between the aircraft.

The first warning is typically issued between 19 and 25 seconds

prior to the calculated possible collision with aircraft or obstacle;

the second is issued 14 to 18 seconds beforehand, and the third 6

to 8 seconds in advance. Warnings are sustained as long as the

threat remains relevant. Depending upon updated data and

prediction, the threat may be downgraded or deleted. Warnings

are selective, i.e. they are only issued if the algorithms detect a

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Classe Audio CP-500 - V2.8 Manuel de service Page 3