Center Tank Pump (One inoperative)

28-21-02A	Center Tank Pump (One inoperative)

Applicable to: -

- Flight preparation/Limitations

In the case of dispatch with fuel in the center tank, the remaining center tank pump failure must be considered for the flight planning. Operator has to ensure that, from any point of the first part of the route where the center tank is not empty the aircraft may reach a suitable airport considering the fuel quantity (FQ) contained in the center tank as definitely not usable for the flight planning (as a consequence of the failure of the remaining center tank pump).

- During cockpit preparation

X FEED pb-swCHECK Off

Affected CTR TK PUMP pb-swOFF

Operative CTR TK PUMP pb-swOFF

- In flight

If the fuel quantity in the center tank is less than 200 kg ( 440 lb):

Operative CTR TK PUMP pb-swMaintain OFF

If the fuel quantity in the center tank is more than 200 kg ( 440 lb):

The fuel in the center tank can be completely used if the operative center tank pump does not fail before the center tank is empty. If the operative center tank pump fails before the center tank is empty, consider the fuel quantity remaining and the time to destination to decide either to continue the flight or to divert.

When the fuel quantity in one wing inner tank is less than 4500 kg ( 10000 lb):

Operative CTR TK PUMP pb-swOn

X FEED pb-swON

When the fuel quantity in one wing inner tank increases above 5500 kg ( 12000 lb):

X FEED pb-swOff

Operative CTR TK PUMP pb-swOFF

Note:

Repeat the previous two steps as many times as necessary until the center tank is empty.The operative center tank pump will switch off automatically

When the fuel quantity in the center tank is less than 250 kg ( 550 lb):

X FEED pb-swOff