TM 1-1520-240-MTF4-4210. Repeat steps 5 thru 8 for the other engine.11. Determine Engine Trim.a. Enter figure 5-8 at the recorded FAT,proceed vertically to the curves which definethe acceptable range of N1 values, thenhorizontally to the topping N1 (percentscale).b. Establish the PTIT band of figure 5-9 asfollows:Upper limit — the upper limit ofthe PTIT band is the top most lineas marked on figure 5-9.Lower limit — from the enginelower limit baseline.Establish Engine Baseline Lower Limit(1) Engine that have previous acceptableTEAC checks within the upper PTITband shall continue to have the band 1lower limit.(2) Certain engines have performanceimprovements. These engines will beN1 limited and shall be trimmed to theacceptable N1 speed band limits. Thethermocouple assemblies shall have aresistance check performed to assureserviceability prior to initial TEACbaseline. Subsequent TEAC checks donot require resistance checks.(3) The TEAC performed following Step 2shall determine the engine lower limitbaseline. A tolerance of 20_C shall besubtracted from the recorded PTIT.
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