TM 1-1520-240-MTF
4-40
NOTE
Below 5 degrees C FAT it may be impossible to
conduct a TEAC without exceeding 10,000 feet
pressure altitude. During cold weather periods,
precise trimming of the fuel control is less critical
since considerable reserve power exsists due to
low ambient temperature. When the above condi-
tions occur, enter a red dash in the aircraft forms
and accomplish the TEAC as soon as conditions
permit.
4. Using NO. 1 & 2 ENGINE BEEP TRIM, set rotor
RPM to 100 percent.
CAUTION
If during the check it becomes necessary to re-
duce engine power, initially reduce power by
operating the No. 1 & 2 ENGINE BEEP TRIM
switch until rotor speed begins to decrease.
Then lower thrust. Do not lower thrust until ro-
tor rpm begins to decrease or an engine over-
speed may occur. Also, to prevent tripping the
indicator and starting the timer, do not allow
the EMERG PWR light to remain on longer
than 5 seconds.
5. Set ENGINE CONDITION LEVER of the engine
not being checked to GROUND. Maintain 100
percent rotor rpm using NO. 1 & NO. 2 ENGINE
BEEP TRIM switch.
CAUTION
While performing this check, do not exceed
the following limits:
1. PTIT
890_C
a. N1
105%
b. Airspeed
140 KIAS
c. Torque
123%
