A pipe support block 41 for an aircraft fluid system, for example a hydraulic fluid line. The pipe support block comprising a first 42 and second part 43 that together form a collar with a pipe receiving bore configured to support a fluid pipe 31 on a structural member 32 such as a wing spar, rib or plate. A first and second fastener hole extends through both the first part and the second part and is arranged to receive a fastener 38 to fasten the first and second parts to each other and to the structural member. The axes of the fastener holes may extend parallel to an axis of the pipe receiving bore. A stop 60 may be provided offset from the axes of the fastener holes to prevent rotation of the first and second part relative to one another. Also provided is a fixed wing aircraft comprising the pipe support block, and a method of supporting a pipe on a structural member of an aircraft.
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