TM 55-1520-240-23-3
4-14
PERFORM ENGINE VIBRATION TEST
(Continued)
4-14
33.
Have pilot operate engines in GROUND (TM
55-1520-240-10). Allow engines to stabilize for
30 seconds.
34.
Record data on chart.
35.
Set CHANNEL selector (23) to 2.
36.
Record data on chart.
37.
Set CHANNEL selector (20) to 1.
38.
Have pilot trim engines to minimum rpm.
39.
Have pilot increase engines to FLIGHT. Allow
engines to stabilize for 30 seconds.
40.
Record data on chart.
41.
Set CHANNEL selector (23) to 2.
42.
Record data on chart.
43.
Set CHANNEL selector (23) to 1.
44.
Have pilot trim engines to 100 percent rotor rpm.
45.
Have pilot set N1 to 92 percent. Allow engines
to stabilize for 30 seconds.
46.
Record data on chart.
47.
Set CHANNEL selector (23) to 2.
48.
Record data on chart.
4-122