TM 1-1520-238-MTFChange 12-82PROCEDURETROUBLESHOOTINGREFERENCEFLIGHT CHECKS (CONT)CAUTIONDo not exceed 100% torque.To avoid torque oscillations whenmaking performance checks, a mini-mum torque split of 10% must be heldbetween engines.Do not reduce the PWR lever to a posi-tion which will allow less than 60%torque on the non-test engine. Contin-gency power is enabled below 51%torque and will prevent the test enginefrom limiting power at the normal dualengine TGT limiter setting.e. Establish an ENG-RTR RPM droopof approximately 2% using either asmall increase in collective pitch ora small reduction of the PWR leveron the non-test engine. Eitherprocedure may be used, but theENG-RTRRPM droop confirms thatthe test engine is limiting power atthe normal dual engine TGT limitersetting or due to NG limiting.
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