21
Is wing anti-ice available during single engine operation if the
related fire switch has been pulled ?
No, pulling the fire switch closes the related wing valve.

Note : Wing anti – ice may be restored after the engine fire is extinguished by  means
of the isolation valve, if required.

ref: Boeing
QRH  D6-27370-8AS-RYR(AS)  September 29, 2005
Engine and Wing Anti-Ice