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green, yellow, and red light segments for NR and TGT. exceeding 100% is in the 30 minute range.
When power is applied, a blue segment at the bottom
of the scale will illuminate if the instrument is 5-6. ROTOR LIMITATIONS.
operational. As the input signals increase, segments
will illuminate as each scale marking is passed. For Autorotation limitations are based on collective full
instance, as NR input passes 97%, the segment down, throttle at idle, or below. After autorotation
between 97 and 98% will illuminate; or as TGT input touchdown, the pilot shall smoothly center the cyclic
passes 680 °C, the green segment between 680 and and reduce the collective to the full down position. The
700 °C will illuminate. When the input signals reach a pilot shall avoid abrupt, large aft cyclic movements
precautionary area or maximum operating limit, a which can cause unnecessary high main rotor yoke
yellow or red segment, respectively, will illuminate. The flapping loads with low rotor speed on the ground.
yellow segment for NR will illuminate by 100%. The red
5-1
TM 1-1520-248-10
70 PSI Maximum
30 to 70 PSI Normal
30 PSI Minimum
ENG OIL P (ENGINE OIL PRESSURE)
130 PSI Maximum
115 to 130 PSI Above 94% NG
90 to 130 PSI 78 to 94% NG
50 to 130 PSI Idle to 78% NG
50 PSI Minimum
During cold weather starts, engine and transmission oil
pressure may exceed MPD range. If this occurs, MPD will
display full scale, WRN light will flash, and an error code
will be displayed. Remain at engine idle until normal range
is attained (2 minutes maximum at extreme temperatures)
F4 and F5 error codes indicate abnormal signal inputs.
Display of these codes during start does not dictate
maintenance action.
Pilot monitoring of oil pressure is limited to operating in
the green band of the MPD and checking pressure vs NG.
XMSN OIL P (TRANSMISSION OIL PRESSURE) ENG OIL T (ENGINE OIL TEMPERATURE)
XMSN OIL T (TRANSMISSION OIL TEMPERATURE)
107 °C Maximum
0 to 107 °C Normal
0 °C Minimum
NOTES
110 °C Maximum
15 to 110 °C Normal
15 °C Minimum
FUEL QTY (FUEL QUANTITY)
NOTE
NG (GAS PRODUCER)
ENG TRQ (ENGINE TORQUE)
AIRSPEED
FUEL LOW caution message comes on at
97.5 lbs. Vertical scale display is yellow
below 100 lbs.
0 to 100 Lbs low fuel
121 to 131% 2-Second transient
112 to 121% 10-Second transient
100 to 112% 30-Minute limit
0 to 100% Continuous
125 KIAS Maximum VNE-refer to fig 5-2
0 to 125 KIAS Normal operation
NOTE
Airspeed indication system
is unreliable below 20 knots.
406900-53-3
J2256
R
107% 10-Second transient
105% Maximum continuous
63 to 105% Continuous
Figure 5-1. Instrument Markings (Sheet 1 of 2)
5-2
TM 1-1520-248-10
120
% RPM
110
105
100
95
90
80
70
60
40
0
NR NP
% RPM - NR (ROTOR)
CONTINUOUS OPERATION
AUTOROTATION
107% Maximum
90% Minimum
%RPM - NP (POWER TURBINE)
TGT TRQ
10
S 9
T
8
7
6
4
2
°C
X
100
%
120
100
80
40
20
0
TGT (TURBINE GAS TEMPERATURE)
S
60
POWERED FLIGHT
107 to 119% 15-Second transient
107% Maximum
100% Normal
R
TRANSIENT
107 to 125% 5-second transient
TRQ (MAST TORQUE)
NORMAL OPERATION
STARTING
927°C Maximum momentary peak
no more than 1 second
802 to 927°C 10-Second transient
NORMAL OPERATION
802 to 905°C 12-Second transient
716 to 802°C 30-Minute limit
0 to 716°C Continuous
107% Maximum
100% Normal
93% Minimum
802 to 871°C 12-Second transient
785 to 802°C 5-Minute limit
716 to 785°C 30-Minute limit
0 to 716°C Continuous
100 to 116% 10 Second transient
(no more than 10 seconds
accumulated per flight hour)
0 to 100% Continuous
R 843 to 927°C 10-Second transient
406900-53-4
J2789
NOTE
Reduced rotor RP M will be accompanied by a
proportional reduction in tail rotor RPM
which may adversely affect directional control,
particularly at high density-altitude and
high gross weight conditions.
Figure 5-1. Instrument Markings (Sheet 2 of 2)
5-3
TM 1-1520-248-10
SECTION III. POWER LIMITS
5-7. ENGINE LIMITATIONS. 5-9. STARTER LIMITS. Starter engagement shall
not exceed the times specified in the following
The engine limitations consists of torque (ENG TRQ schedule:
　
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