The 150-hour overhaul interval is prohibited if which condition is met?

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The key idea is fuel-system redundancy and crossfeed capability governing maintenance intervals. The 150-hour overhaul is allowed only if the fuel system can be relied upon under fault conditions. If the standby fuel pump is inoperative, you lose a critical redundancy path to feed the engines if the primary pump fails, so performing the overhaul under those conditions isn’t acceptable. Likewise, if the crossfeed capability requirement exceeds FL200, the system cannot guarantee adequate fuel delivery from one tank to the others at higher altitudes, compromising safety during operation. Therefore, the 150-hour overhaul interval is prohibited whenever either of these situations is present. If both are functioning properly and within limits, the interval can be performed.