Airbus (A320) drill
COCKPIT WINDSHIELD/WINDOW CRACKED
In case of a one ply failure, whichever one it may be, the windshield is still able to sustain the maximum differential pressure. However, because the pilot is unable to accurately determine how many plies have failed, the differential pressure must be reduced to 5 PSI by applying the following procedure :
MAX FL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
The maximum flight level is restricted to FL230 to obtain DELTAP 5 PSI, without resulting in an excessive cabin altitude and corresponding EXCESS CAB ALT warning.
The following procedure, allows maintaining DELTAP 5 PSI in manual cabin pressure mode.
– CAB PRESS MODE SEL . . . . . . . . . . ...... . . . . . . . .. . . . . . . . . . . MAN
– MAN V/S CTL . . . . . . . . . . . . . .. . . . . ..... . . . . . . . . . . . . . .AS RQRD
Set the cabin altitude, according to the table below :
DELTAP = 5 PSI
FL 100 - CABIN 0
FL 150 - CABIN 3000
FL 200 - CABIN 6000
FL 230 - CABIN 8000
•When starting the final descent :
– CAB PRESS MODE SEL. . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . .AUTO