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PRO-SPO-65 OPERATIONS AT QNH ABOVE 1050 hPa
PROCEDURES................................................................................................................................................... 1/2
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SPECIAL OPERATIONS
FLIGHT WITHOUT CABIN PRESSURIZATION
A330/A340 FLEET PRO-SPO-20 P 1/12
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The aircraft may fly without cabin pressurization because of an aircraft system deficiency (see MEL)
or after a decompression in flight. The pilot’s choice of flight level and airspeed depends on the
cause of the depressurization, the distance to fly, the topographic conditions and the meteorological
conditions.
OXYGEN REQUIREMENTS
Applicable to: ALL
CREW MEMBERS
See FAR 121.329 or JAR-OPS 1.770
PASSENGERS
For flight at cabin pressure altitudes above 10 000 ft, up to and including 14 000 ft, there must be
enough oxygen to supply 10 % of the passengers for the flight at those altitudes that lasts more
than 30 min.
For flight at cabin pressure altitudes above 14 000 ft, up to and including 15 000 ft, there must be
enough oxygen for 30 % of the passengers.
For flight at cabin pressure altitudes above 15 000 ft, there must be enough oxygen for all
passengers.
FLIGHT PLANNING AND EXECUTION
Applicable to: ALL
ALTITUDE
Flight route planning should consider the above-stated restriction in cabin altitude.
The EXCESS CAB ALT warning on the ECAM will be activated, if the cabin altitude exceeds:
In climb or descent : The higher of both 9 950 (± 350), or takeoff/landing ‐ field pressure altitude
+1 000 ft, or
‐ In cruise : 9 550 ft.
When above 14 000 ft, the passenger oxygen masks will be automatically provided. Therefore, the
recommended maximum altitude for prolonged flight is FL 100.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SPECIAL OPERATIONS
FLIGHT WITHOUT CABIN PRESSURIZATION
A330/A340 FLEET PRO-SPO-20 P 2/12
FCOM 19 AUG 10
The minimum altitude should be selected by respecting :
‐ The Minimum Safe Altitude (MSA),
‐ Turbulence, which is uncomfortable for passengers and,
Low Outside Air Temperature (OAT), which can be uncomfortable ‐ for passengers when the
cabin is ventilated by ram air only.
Applicable to: ALL
AIRSPEED
If decompression is due to structural damage, consider airspeed reduction. Use slats and flaps, as
necessary, to establish low speed conditions. In addition, turbulent conditions are uncomfortable
for passengers, and gust response should be minimized by reducing airspeed.
Applicable to: ALL
CLIMB AND DESCENT RATE
Takeoff must be performed normally, and the rate of climb must be limited to about 500 ft/min, to
ease the pressure change felt by passengers and crew.
Likewise, the rate of descent must be limited to about 1 000 ft/min, except for the final approach
which must be performed normally. Notify the ATC of any performance deficiency by a remark in
the flight plan.
Applicable to:
EMERGENCY DESCENT IN CASE OF RAPID DEPRESSURIZATION
In case of depressurization, the fixed cabin oxygen system supplies oxygen, stored in
interconnected cylinders. The flow rate is controlled by an altimetric flow regulation device within
each mask container.
Depending on the number of masks used, and on the altitude flown during the descent, the
following chart provides the oxygen supply time.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SPECIAL OPERATIONS
FLIGHT WITHOUT CABIN PRESSURIZATION
A330/A340 FLEET PRO-SPO-20 P 3/12
FCOM 19 AUG 10
Oxygen is supplied for :
‐ 30 s at FL 400,
‐ Descent at 5 000 ft/min from FL 400 to cruise altitude,
‐ Descent at 5 000 ft/min cruise altitude to FL 100,
‐ Flight time at a chosen cruise altitude, read on the chart.
Note: The pax oxygen system is designed such that for a constant pressure and a given
number of pax masks in use the flight time increases for flight levels above 140 up to 200
and decreases for altitudes above.
Applicable to:
EMERGENCY DESCENT IN CASE OF RAPID DEPRESSURIZATION
In case of depressurization, the fixed cabin oxygen system supplies oxygen, stored in
interconnected cylinders. The flow rate is controlled by an altimetric flow regulation device within
each mask container.
Depending on the number of masks used, and on the altitude flown during the descent, the
following chart provides the oxygen supply time.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
SPECIAL OPERATIONS
FLIGHT WITHOUT CABIN PRESSURIZATION
A330/A340 FLEET PRO-SPO-20 P 4/12
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A330/A340机组操作手册 FLIGHT CREW OPERATING MANUAL FCOM 11(32)
