Just checked possible ∆T trough LP section and I am really surprised how low is on idle N1. Table is from 56-3, which is bit different, but with same number of stages. PT25 is used for fuel metering and HPTACC schedule. Presure sensing at this station is optional, for engine trend monitoring only. The temperature for both channels is sensed by heated platinium wires with no extra anti-ice.
