TM 55-2840-231-23
1-68. Engine Operating Procedures - Continued
LOCATION/lTEM
REMARKS
ACTION
TEST STAND/ -
Continued
The engine should continue to accelerate
and stabilize at 62-65% N1 speed (idle).
Oil pressure should beat least 50 psi (3.51
kg/sq cm).
NOTE
3. TEST STAND/
Operating Idle
4. TEST STAND/
Flight Autorotation
During cold weather, oil pressure
up to 150 psi (10.55 kg/sq cm) is
permissible. Operate at idle
until normal pressure limits can be
maintained.
Idle is the same setting as for starting and is
established with the governor lever at the
minimum position and the N1 throttle lever
at the idle (30°) position. Other determining
factors are:
N1 speed =62 to 65%
N2 speed = 75 to 105%
GPTOT = Determine from the following
figure
Torque pressure = O to 11 psi (O to 0.77
kg/sq cm)
Flight autorotation is established with the
governor lever in the minimum position
and the N1 throttle lever at any position
between idle (30°) and maximum (900).
Other determining factors are:
N1 speed= 63% (estimated)
N2 speed =98 to 108% (normal, see
table 1-9 for exception)
GPTOT = Determine from the preceding
figure.
Torque pressure = O to 5 psi (O to
0.35 kg/sq cm)
1-146
