Hi Airmen25,
FCOM Procedures / ABN / Power Plant / Eng 1(2) shutdown,
"If ENG FIRE pb-sw pushed:
XBLEED.....SHUT"
Apparently, if the engine has suffered damage (requiring the Fire PB push) there is a chance that metal debris may have contaminated the non return function of the engine's bleed valve. Introducing bleed air to such a system would cause an undetected bleed leak, with consequent problems with pressurisation, bleed demands etc.
ECAM should invite you to open the APU Bleed valve if the APU is running and there is no engine damage.
If engine 2 was damaged, then closing the X- bleed valve would permit APU bleed air to supply Pack 1.
Last edited by rudderrudderrat; 21st May 2012 at 22:22.