F-GZCP - 1st June 2009
43
NEW PARAGRAPHS
(These paragraphs complete the Interim Report of 2 July 2009)
1.6 Aircraft information
1.6.11 Functioning of the automated systems
1.6.11.1 Probe heating
The probes that are installed on the aircraft are heated electrically to protect
them from icing. Three independent Probe Heat Computers (PHC) control
and monitor the heating of the static pressure pick-offs, Pitot probes, total
air temperature (TAT) and angle of attack (AOA) sensors. One of the PHC’s
manages the Captain probes, another the First Officer probes and the third
the standby probes (there is no TAT standby sensor).
On the ground, neither of the TAT sensors is heated and the three Pitot probes
are heated only a little to prevent any potential damage. The PROBE / WINDOW
HEAT push-button located on the overhead panel in the cockpit allows the
crew to force the Pitot tube heating onto flight mode.
1.6.11.2 Autopilot, flight director and autothrust
The autopilot, flight director and autothrust functions are ensured by two
Flight Management Guidance and Envelope Computers (FMGEC), connected
in particular to a Flight Control Unit (FCU). Each of these two computers can
perform these three functions.
The flight director (FD) displays the control orders from the FMGEC on the PFD.
In normal operation, with the FDs engaged (FD push-buttons lit on the FCU),
FD 1 displays the orders from FMGEC 1 on PFD 1 (left side) and FD 2 displays
the orders from FMGEC 2 on PFD 2 (right side). It is possible to display only
one of them at a time, although the Airbus normal procedures recommend
that either both or neither of them should be displayed. Furthermore, the
autopilot 1 function is ensured by FMGEC 1 and the autopilot 2 function by
FMGEC 2. The autothrust function (A/THR) can be ensured by the two FMGEC’s
independently, but by priority is ensured by the FMGEC associated to the
engaged autopilot.
The materialisation of the FD on the PFD depends on the mode selected with
the HDG-V/S / TRK-FPA push-button:
in HDG-V/S mode, the FD is represented by two trend bars and represents
the autopilot orders;
in TRK-FPA mode, the FPV speed vector (or “bird”) is displayed, it indicates
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