Pulling CB's
Many years ago I had a wing a/ice problem. Outstation engr isolated the system. On finals at base - Ldg Ckecks ..." Ldg Gear ... Oh dear, no greens. G/A. Check everything. No greens. Briefed No 1 Should be no problem, but if expensive noises, you will know the worst." Later turned out that pulling Wing A/Ice CB's also isolated the gear wngs - but obviously not EICAS because it stayed mum (but don't worry, it was soon changed!). Manufacturer's engr told me that up to 10 different functions can be routed through any one CB (and you are rarely let into the secret).