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approximately 1 PSI differential pressure, to help the blast go outwards. 1 PSI differential
pressure corresponds to a 2 500 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.
While maintaining the cabin altitude, descend the aircraft to the cabin altitude + 2 500 ft and
maintain delta P at 1 PSI.
During further steps of descent, maintain delta P at 1 PSI.
For landing, reduce the differential pressure to zero, until the final approach.
If flight conditions are different, the crew should adapt the procedure, bearing in mind the
above-mentioned principles (background paragraph).
AIRCRAFT (if climbing).............................................................................................LEVEL OFF
CABIN PRESS MODE SEL..................................................................................................MAN
To be continued on next page
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
ABNORMAL AND EMERGENCY PROCEDURES
MISCELLANEOUS
A318/A319/A320/A321 FLEET PRO-ABN-80 P 57/182
FCOM 19 AUG 10
BOMB ON BOARD (Cont'd)
The purpose is to immediately prevent the cabin altitude from increasing, in order to avoid the
activation of an altitude-sensitive bomb.
CAB ALT......................................................................................................................MAINTAIN
Use MAN V/S CTL selector to maintain the cabin altitude at the value it had when the bomb
was discovered.
CABIN CREW..................................................................................................................NOTIFY
ATC/COMPANY OPERATIONS......................................................................................NOTIFY
To obtain expert advice from explosive specialists.
FUEL RESERVES...................................................................................................DETERMINE
Keep in mind that when flying at cabin altitude + 2 500 ft, fuel consumption in CONF 1, with
landing gear down, will be about 2.1 times that consumed in clean configuration.
NEXT SUITABLE AIRPORT....................................................................................DETERMINE
FCU SPEED SELECTION KNOB................................................................... PULL AND TURN
Select the most appropriate speed, taking into account the time to destination, the fuel
consumption and the fact that low speed could reduce the consequences of possible structural
damage, if the bomb explodes.
DESCENT TO CAB ALT + FT or MEA or minimum obstacle clearance altitude.................
......................................................................................................................................INITIATE
Descending to 2 500 ft above the cabin altitude gives a cabin differential pressure of
approximately 1 PSI, which helps to ensure that the blast goes outwards, if the bomb
explodes.
AVOID SHARP MANEUVERS
Which might result in the bomb moving.
CAB ALT......................................................................................................................MAINTAIN
Use MAN V/S CTL selector to maintain the cabin altitude. Initially brief UP input should be
required; but, be careful not to increase the cabin altitude.
�� When at CAB ALT + 2 500 ft:
1 PSI DELTA P.....................................................................................................MAINTAIN
Use MAN V/S CTL selector to adjust delta P to 1 PSI. Brief DN input should be initially
required to set 0 ft/min cabin vertical speed.
GALY & CAB.................................................................................................................. OFF
FLAPS (fuel permitting)..........................................................................AT LEAST CONF 1
For landing, use normal configuration.
LANDING GEAR (fuel permitting, except for flight over water).............................................
To be continued on next page
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
ABNORMAL AND EMERGENCY PROCEDURES
MISCELLANEOUS
A318/A319/A320/A321 FLEET PRO-ABN-80 P 58/182
FCOM 19 AUG 10
BOMB ON BOARD (Cont'd)
.................................................................................................................................. DOWN
The detonation could damage the landing systems. Therefore, if fuel permits, configure
the aircraft for landing as soon as possible. Reducing the speed will minimize stress on the
aircraft structure.
　
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