Page 70 - Demo

2.10/54
REV 26
A330
CHINA AIRLINES
REV 26
PAGE 54
BOMB ON BOARD
IF POSSIBLE, LAND AND EVACUATE THE AIRCRAFT IMMEDIATELY. If it is not possible to land and evacuate the aircraft within 30 minutes, apply the following procedures :
COCKPIT PROCEDURES Background
To avoid the activation of an altitude-sensitive bomb, the cabin altitude should not exceed the value at which the bomb has been discovered.
To reduce the effects of the explosion, the aircraft should fly as long as possible with approximately 1 PSI differential pressure, to help the blast go outwards. 1 PSI differential pressure corresponds to a 2500 ft difference between the aircraft and the cabin altitude.
These conditions are achieved by using the manual pressure control.
Procedure
The following procedure assumes that it is initiated during climb or cruise :
– First, maintain the cabin altitude using manual pressure mode.
– While maintaining the cabin altitude, descend the aircraft to the cabin altitude + 2500 ft and maintain delta P at 1 PSI .
– During further steps of descent, maintain delta P at 1 PSI using the cabin V/S target selector..
– During the approach, use automatic pressure mode in order to reduce the differential pressure to zero at touchdown.

If flight conditions are different, the crew should adapt the procedure, bearing in mind the above-mentioned principles (background paragraph).
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