ESTABLISH HIT BASELINE
Army Rotary Wing Aviator (2)
Battery Connected (Task 1-39)
A new baseline Health Indicator Test
(HIT) is required following replacement
of a major engine component that
affects airflow/performance (such as a
Face aircraft into wind and turnoff all bleed air.
Insure that PTIT temperatures have stabilized.
Adjust engine not being HIT checked to
Trim rotor speed to 100 percent.
Enter line 1 at FAT nearest free air temperature.
Set N1 percent at value indicated in line 2.
Allow indicated PTIT to stabilize for 2 minutes
while maintaining rotor speed set in step 3 above.
Read PTIT from indicator.
Apply PTIT A correction factor in line 3 to
indicated PTIT and record result in open space
in line 4.
Apply PTIT B correction factors in line 5 to
PTIT in line 4 and record result in line 8 for
Enter baseline information in the respective
columns of the HIT PTIT LOG (4-2).
Enter aircraft or engine hours and word
"BASELINE" in log section at bottom of HIT PTIT