Manoeuvre d'urgence / emergency maneuver
No problem BOAC, at that time, the rotating speed vector was indeed crossing the horizontal (making the AoA and the pitch angle equal... to 16°), the beginning of the catastrophic descent.
Unfortunately, as said before, the english version of the 1st BEA report does not translate the C/L "unreliable IAS / ADR check proc" and the emergency maneuver (manoeuvre d'urgence page 121 of the 1st BEA report).
The emergency maneuver (memory item below) may be implemented in cruise phase (above FL100), in an unreliable IAS context, if the safety of the flight is deemed jeopardized:
MEMORY ITEMS
THRUST/PITCH
Below THR RED ALT: TOGA/12.5°
Above THR RED ALT: CL/10° Below FL 100
.....................................CL/5° Above FL 100
AP
OFF
FD
OFF
A/THR
OFF
FLAPS
MAINTAIN CURRENT CONFIG
SPEEDBRAKES
CHECK RETRACTED
L/G
UP WHEN AIRBONE
PS) 5 days after the AF 447 crash, AF's safety direction released a note to all the navigating crews urging them not to apply this emergency maneuver in cruise phase:
http://www.eurocockpit.com/docs/INFO_DIV_AIRBUS.pdf