TM 55-1520-240-23-3
4-3
TURBINE ENGINE ANALYSIS CHECK (TEAC)
(Continued)
4-3
4.
Have pilot set copilot’s altimeter to 29.92 inches
(TM 55-1520-240-10).
5.
Have pilot select altitude where TEAC can be
performed at 120 KIAS (not to exceed vne) at
98 percent rotor rpm.
NOTE
Below 5ºC 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 exists due to low ambient
temperature. When the above
condition occurs, enter a red dash in
the aircraft forms and accomplish the
TEAC as soon as conditions permit.
6.
Have pilot take off and climb to height selected
in step 5.
7.
Deleted.
8.
Deleted.
9.
Have pilot set rotor speed to 100 percent rpm
using NO. 1 & 2 ENGINE BEEP TRIM switch.
10.
Have pilot maintain airspeed of 120 KIAS, in
level flight.
Do not use thrust control to reduce
engine power during teat. Engine
overspeed can occur unless power is
first reduced with NO. 1 & 2 ENGINE
BEEP TRIM switch.
Do not allow EMERG PWR light to
stay on longer than 5 seconds. After
5 seconds, indicator trips and timer
starts.
11.
If an emergency occurs or if it becomes
necessary to maneuver the helicopter during
TEAC, do the following:
a.
Reduce engine power using NO. 1 & 2
ENGINE BEEP TRIM switch.
b.
When rotor rpm begins to decline, use thrust
control to decrease engine power. Do not
use thrust control until rotor rpm begins to
decrease.
4-27
