英语翻译飞机放行时有个故障：PACK OVHT,也可以放行,但是有4个限制条目：其中一个是：the pack contg

英语翻译
飞机放行时有个故障：PACK OVHT,也可以放行,但是有4个限制条目：其中一个是：the pack contgroller associated with the non-affected air conditioning pack should be operative on both channels,(这里的both channels谁能解释下：).另一个条目时：the affected pack push button switch is selected "OFF" and the associated pack flow control valve is checked "colsed" on ECAM bleed page(这句怎么解释?)