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par c.foussa Mer 5 Juil 2017 - 8:14Suite à une anomalie sur un équipement TCAS II d' Honeywell, EASA vient de publier une AD demandant le remplacement d'un TCAS d'Honeywell. Depuis 2012, 171 cas d'alarmes TCAS intempestives ont été recensées en Europe. Certainement plus et non déclarées.
Il y déjà eu une AD en 2017 demandant le remplacement de cet équipement pouvant provoquer une "unsafe "condition", l' EASA vient de la rééditer ainsi qu'un SIB dont voici l'essentiel:
Since 2012, a number of false TCAS resolution advisories (RA) have been reported by various European Air Navigation Service Providers. EASA has published certification guidance material for collision avoidance systems (AMC 20-15) which defines a false TCAS RA as an RA that is issued, but the RA condition does not exist. It is possible that more false (or spurious) RA events have occurred, but were not recorded or reported. The known events were mainly occurring on Airbus single-aisle (A320 family) aeroplanes, although several events have also occurred on Airbus A330 aeroplanes. Investigation determined that the false RAs are caused on aeroplanes with a Honeywell TPA-100B TCAS processor installed, P/N 940-0351-001. This was caused by a combination of three factors: (1) hybrid surveillance enabled; (2) processor connected to a hybrid GPS source, without a direct connection to a GPS source; and (3) an encounter with an intruder aeroplane with noisy (jumping) ADS-B Out position.
SIB:
https://ad.easa.europa.eu/ad/2014-33R1
AD:
https://ad.easa.europa.eu/ad/17-087
Il y déjà eu une AD en 2017 demandant le remplacement de cet équipement pouvant provoquer une "unsafe "condition", l' EASA vient de la rééditer ainsi qu'un SIB dont voici l'essentiel:
Since 2012, a number of false TCAS resolution advisories (RA) have been reported by various European Air Navigation Service Providers. EASA has published certification guidance material for collision avoidance systems (AMC 20-15) which defines a false TCAS RA as an RA that is issued, but the RA condition does not exist. It is possible that more false (or spurious) RA events have occurred, but were not recorded or reported. The known events were mainly occurring on Airbus single-aisle (A320 family) aeroplanes, although several events have also occurred on Airbus A330 aeroplanes. Investigation determined that the false RAs are caused on aeroplanes with a Honeywell TPA-100B TCAS processor installed, P/N 940-0351-001. This was caused by a combination of three factors: (1) hybrid surveillance enabled; (2) processor connected to a hybrid GPS source, without a direct connection to a GPS source; and (3) an encounter with an intruder aeroplane with noisy (jumping) ADS-B Out position.
SIB:
https://ad.easa.europa.eu/ad/2014-33R1
AD:
https://ad.easa.europa.eu/ad/17-087
