737 NG QRH queries

[N1 Limit]

Hi there
On the Wing-Body Overheat NNC it says:

1) ISOLATION VALVE switch ................ CLOSE

3) R PACK sitch ..................................OFF

This cause the operating pack to regulate to high flow in flight with the flaps up

But this latter statement doesn't suppose the ISOLATION VALVE is on AUTO for the opposite PACK to regulate n High flow?


On the Emergency NNC

5) Theust Levers (both) ................ reduce thrust to minimum or as needed for anti- ice


The appropriate action wouldn't be to disconnect A/T? I know LVL change at high speed on descent would idle it but isn't it better To have your speed under control?

[Fullblast]

But this latter statement doesn't suppose the ISOLATION VALVE is on AUTO for the opposite PACK to regulate n High flow?


No. The auto selection of high mode is regulated by the position of the pack switches, not the isolation valve.

[framer]

The appropriate action wouldn't be to disconnect A/T? I know LVL change at high speed on descent would idle it but isn't it better To have your speed under control
I don't quite understand what you are saying. The speed is totally under control in Level Change, it will pitch for whatever speed you ask of it.