LIMITS Flashcards
Minimum Planned Fuel on Landing
Minimum planned fuel on landing shall be no less than 225 pounds (approximately 20 minutes) of fuel per main
tank. With fuel less than 300 pounds per main tank, maintain balanced flight at Angles Of Bank (AOBs) greater
than 30°.
Turbine Gas
Temperature (TGT)
0 to 810 °C Continuous Green
810 to 851 °C 30 minutes Yellow
851 to 878 °C 10 minutes Red
878 to 903 °C 2.5 Minutes Red
903 to 949 °C 12 seconds Red
949 °C Maximum Red
Power Turbine Speed
(Np)
<96% Avoid Red
96 to 105% Continuous Green (Yellow above
101%)
105 to 117% 20 seconds Yellow
117 to 120% 12 seconds Yellow
120% Maximum Red
(C)
During engagement, extended operations in the 20 to 40% and 60 to 75% ranges may cause engine damage.
Main Rotor Speed (Nr)
<96% Avoid Red
96 to 101% Continuous Green
101 to 120% Precautionary Yellow
120% Maximum Red
123% Maximum for FCF only Red
127% Overspeed Latch Red
Dual-Engine Torque
(TRQ) <80 KIAS
0 to 120% Continuous Green
120 to 144% 10 seconds Yellow
144% Maximum Red
Dual-Engine Torque
(TRQ) >80 KIAS
0 to 106% Continuous Green
106 to 127% 10 seconds Yellow
127% Maximum Red
(N)
Dual Engine Torque Limits apply when both engines are above 65% torque.
Single-Engine Torque
(TRQ)
0 to 135% Continuous Green
135 to 144% 10 seconds Red
144% Maximum Red
Gas Generator Speed
(Ng)
0 to 102.2% Continuous Green
>102.2 to 106% 2.5 minutes Yellow
>106 to 107% 12 seconds Red
107% Maximum Red
Transmission
Temperature (XMSN T)
-50 to 105 °C Continuous Green
105 to 120 °C Precautionary Yellow
120 °C Maximum Red
Transmission Pressure
(XMSN P)
20 psi Minimum Red
20 to 30 psi Idle and transient Yellow
30 to 65 psi (45 to 60 psi
in level flight) Continuous Green
65 to 130 psi Precautionary Yellow
130 psi Maximum Red
Engine Oil Temperature
(ENG OIL T)
-50 to 135 °C Continuous Green
135 to 150 °C 30 minutes Yellow
150 °C Maximum Red
Engine Oil Pressure
(ENG OIL P)
22 psi Minimum Red
22 to 26 psi Precautionary Yellow
26 to 100 psi Continuous Green
100 to 120 psi Precautionary Yellow
120 psi Maximum Red
Engine Start
<16 °C
First Cycle 60 Seconds
Second Cycle 60 Seconds
Third Cycle 60 Seconds
Fourth Cycle 30 Minutes
16 to 52 °C
First Cycle 60 Seconds
Second Cycle 30 Minutes
NOTES:
1. A start cycle is defined as starter initiation, acceleration in Ng, and starter dropout/disengagement.
2. Times for motoring are cumulative within a 5-minute period.
Transmission Oil Temperature Limitations
During any operating condition, no maintenance action is required if main transmission oil temperature is in the precautionary range continuously for 5 minutes or less. Prolonged hovering in hot weather, 86 ⁰F (30 ⁰C), may cause main transmission oil temperature to rise into the precautionary range. Operation in the precautionary range for less than 30 minutes during any one flight under this condition is acceptable and no maintenance action is required.
Transmission Oil Pressure Limitations
During steady-state level pitch attitudes (i.e., level flight), the transmission oil pressure should be 45 to 60 psi. The following conditions do not constitute an immediate emergency situation, but may be indicative of a degraded lubrication system. Any discrepancy shall be documented on a Maintenance Action Form (MAF).
- Steady pressure outside of 45 to 60 psi, but within the normal limits of 30 to 65 psi.
- Fluctuations not to exceed a range of 10 psi, within the normal limits of 30 to 65 psi.
During transient pitch or steady-state nose-high pitch attitudes (autorotations, downwind hovering, rearward flight, slope-up landings, etc.) transmission oil pressure fluctuations (including momentary fluctuations below 30 psi and transient drops below 20 psi for up to one second) are acceptable. Operating with pressure fluctuations below 30 psi shall be limited to 30 minutes. During rotor engagement, a zero oil pressure indication may indicate a no-oil-flow condition through the oil lubrication system. Operating with a no oil pressure indication shall be limited to less than 1 minute and shall be documented on a maintenance action form (MAF).
Rotor Engagement and Disengagement Limitations
Maximum wind velocity for rotor engagement or disengagement is 45 knots from any direction.
Maximum Forward Airspeed (Vne)
180 KIAS
Autorotation Airspeed
100 KIAS