When does the thrust mode change from CLB to CRZ?
In some airlines the thrust limit mode automatically changes from CLB to CRZ when the cruise altitude is captured. In other airlines CLB remains active and changes to CRZ only when the VNAV DESCENT phase becomes active (in both cases VNAV must be engaged). This is a software option selected by maintenance personnel in the FMC-CDU on the flight deck. Go to the MAINTENANCE INDEX as described in page 152 of the PS1.3 Manual (the aircraft must be on the ground). Select PERF FACTORS and enter the code word arm in line 6R. Either enter CRZ/ or CLB/ in line 4R. Dont forget the slash /. For FMC training only! Dont modify this page on the real aircraft without directions from your airline!
