10/20/2023 0 Comments Pmdg 747-400![]() In the maintenance manual (for the RB211), the following limitation is specified: During maintenance, only 30%N1 reverse is allowed. ![]() The PW EGT limit during reverse operation is the same as takeoff (650C). They use N1 control during reverser operation, but no (unambiguous) max rpm limits are given in my manuals. The airflow around the EPR sensors may be disturbed during reverser operation. The RB211 and the PW4000 do not use EPR for control during reverse operations. This limits reverse thrust to 90% of maximum rated thrust." "The ECU calculates the reverse thrust demand as a direct function of TLA (thrust lever angle) position. I have one GE manual which (rather) broadly states that N1 is limited to 100% during reverse thrust (with both reverser translating cowls deployed on the engine). ![]() It's difficult to find information on reverse thrust levels in manuals.
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