EMERGENCY DESCENT

QRH

CREW OXY MASKS……………………………………………………………………………….. USE
 SIGNS………………………………………………………………………………………………………ON
EMER DESCENT………………………………………………………………………………INITIATE
If A/THR is not active:
THR LEVERS……………………………………………………………………………………. IDLE
SPD BRK……………………………………………………………………………………………… FULL
WHEN DESCENT ESTABLISHED
SPEED………………………………………………………………………….MAX/APPROPRIATE
CAUTION
Descend at the maximum appropriate speed. If structural damage is suspected, use the flight controls with care and reduce speed as appropriate.
Landing gear may be extended. In such a case, speed must be reduced to VLO/VLE.
ENG MODE SEL…………………………………………………………………………………….IGN
ATC…………………………………………………………………………………………………NOTIFY
Notify ATC of the nature of the emergency, and state intention. The flight crew can communicate with the ATC using voice, or CPDLC when the voice contact cannot be established or has a poor quality.
EMER DESCENT (PA)………………………………………………………………. ANNOUNCE
The flight crew must inform the cabin of emergency descent on the PA system.
ATC XPDR 7700………………………………………………………………………….CONSIDER
Squawk 7700 unless otherwise specified by ATC.
‐ To save oxygen, set the oxygen diluter selector to the N position
‐ If the oxygen diluter selector remains set to 100 %, oxygen quantity may be insufficient to cover the entire emergency descent profile
‐ Ensure that crew communication is established with oxygen masks. Avoid the continuous use of the interphone to minimize interference with the breathing noise in the oxygen mask.
MAX FL………………………………………………………………………………. 100/MEA-MORA
 If CAB ALT is above 14 000 ft:
PAX OXY MASKS……………………………………………………………………… MAN ON
This action confirms that the passenger oxygen masks are released.
Note: Notify the cabin crew when the aircraft reaches a safe flight level, and when cabin oxygen is no more necessary.

FCTM

The emergency descent should only be initiated on positive confirmation that cabin altitude and rate of climb are excessive and uncontrollable. However, the flight crew must rely on the CAB PR EXCESS CAB ALT warning, even if not confirmed on the CAB PRESS SD page. The CAB PR EXCESS CAB ALT warning can be triggered by a cabin pressure sensor, different from the one used to control the pressure and display the cabin altitude on the SD.

The flight crew should perform the actions of the EMER DESCENT in two steps:
‐ First step: Apply the memory items.
‐ Second step: Perform the read-&-do procedure (ECAM or QRH).

During the first step, the PM should focus on monitoring the FMA to ensure that the PF had correctly established the aircraft in descent.
During the second step, the PF should refine the settings. To initiate the emergency descent, the use of autopilot (AP) and autothrust is highly recommended. At high flight levels, the flight crew should extend the speed brakes while monitoring the VLS. This is in order to avoid the activation of the angle of attack protection which may result in the retraction of the speed brakes and in AP disconnection.

Note: When in IDLE thrust, high speed and with speed brake extended, the rate of descent is approximately 7 000 ft/min. To descend from FL 390 to FL 100, it takes approximately 4 min and 40 NM.

The flight crew should be aware that the MORA displayed on ND is the highest MORA value within a radius of 40 NM around the aircraft.

The flight crew should suspect structural damage in case of a loud bang, or high cabin vertical speed. If the flight crew suspects structural damage, apply both of the following:

‐ Set the SPEED/MACH pb to SPEED, to prevent an increase in the IAS, or to reduce the speed.

This action minimizes the stress on aircraft structure

‐ Carefully use the speed brakes, to avoid additional stress on aircraft structure.

If the cabin altitude goes above 14 000 ft, the flight crew must press the MASK MAN ON pb. When it is obvious that the cabin altitude will exceed 14 000 ft, the flight crew could press the MASK MAN ON pb, before the cabin altitude reaches 14 000 ft.
Finally, subsequent to an emergency descent, once the oxygen masks are removed, the flight crew should perform all of the following:
‐ Close the oxygen stowage mask compartment.
‐ Press the PRESS TO RESET oxygen control slide, to deactivate the mask microphone, and to cut off the oxygen.