NATOPS Chapter 4 Flashcards
4.1.1.1 Exceeding Operating Limitations
Anytime an operational limit is exceeded, an appropriate entry shall be made on a MAF.
“XXX” will display in red, when a TGT or Torque limit is reached.
If a limit is exceeded to the extent that a red “XXX” is indicated, the crew shall land as soon as practicable.
4.1.2.1 Engine Limitations
The engines are limited by Ng, Np, TGT, oil pressure, and oil temperature.
4.1.2.2 Start Cycle definition
Starter initiation, acceleration in Ng, and starter dropout/disengagement
4.1.2.3 Engine Start Limitations
- For crossbleed starts, the receiving engine shall be at or above 24 percent Ng prior to advancing the PCL to IDLE.
- Engine start with main rotor blades or tail pylon folded is prohibited.
- The start TGT limit is 851*C until idle speed is attained.
4.1.2.4 Engine Limitations with gust lock engaged.
Engine operation with Gust Lock engaged is prohibited.
4.1.2.5 Min planned fuel on landing
Shall be no less than 600 pounds.
4.1.2.6 APU limitations (paragraph)
The APU is not intended for routine in-flight use. Operation of the APU shall be limited to essential operations only. Acceptable in-flight use includes emergency procedures, single-engine training, practice auto-rotations, and powering the ECS during extreme temperature operations.
TGT limits
0-810 Continuous Green
810-851 30 min Yellow
851-878 10 min Red
878-903 2.5 min Red
903-949 12 seconds Red
949 Max Red
Np Limits
<96% Avoid Red
96-105% Continuous Green (Yellow above 101%)
105-117% 20seconds Yellow
117-120% 12seconds Yellow
120% Maximum Red
Caution
During engagement, extended operations in the 20-40% and 60-75% ranges may cause engine damage.
Nr Limits
<96% Avoid Red
96-101% Continuous Green
101-120% Precautionary Yellow
120% Maximum Red
123% Maximum for FCF only Red
127% Overspeed Latch Red
Dual Engine Torque <80KIAS
0-120% Continuous Green
120-144% 10 seconds Yellow
144% Maximum Red
Note
Dual Engine Torque Limits apply when bother engines are above 65% torque.
Dual Engine Torque >80KIAS
0-106% Continuous Green
106-127% 10 seconds Yellow
127% Maximum Red
Note
Dual Engine Torque Limits apply when bother engines are above 65% torque.
Dual Engine Torque >80KIAS
0-106% Continuous Green
106-127% 10 seconds Yellow
127% Maximum Red
Single Engine Torque
0-135% Continuous Green
135-144% 10 seconds Red
144% Maximum Red
Ng Limits
0-102.2% Continuous Green
>102.2-106% 2.5 minutes Yellow
>106-107% 12 seconds Red
107% Maximum Red
Transmission Temp Limits (#’s)
-50-105C Continuous Green
105-120C Precautionary Yellow
120*C Maximum Red
Transmission Pressure Limits (#’s)
20psi Minimum Red
20-30psi Idle and Transients Yellow
30-65psi (45-60psi in level flight) Continuous Green
65-130psi Precautionary Yellow
130psi Maximum Red
Engine Oil Temp Limits
-50-135C Continuous Green
135-150C 30 minutes Yellow
150*C Maximum Red
Engine Oil Pressure Limits
22psi Minimum Red
22-26psi Precautionary Yellow
26-100psi Continuous Green
100-120psi Precautionary Yellow
120psi Maximum Red
Engine Starter Limitations
<16*C
1st cycle, 60 seconds
2nd cycles, 60 seconds
3rd cycle, 60 seconds
4th cycle, 30 minutes
16-52*C
1st cycle, 60 seconds
2nd cycle, 30 minutes
times are cumulative within a 5 min period
Engine Motor (Ignition Off)
Any Temperature
2 min on, 5 min off
2 min on, 30 min off
Engine Motor (Ignition Off)
Any Temperature
2 min on, 5 min off
2 min on, 30 min off
times are cumulative within a 5 min period
Transmission Limitations
Limited by Nr, torque, oil pressure, and oil temperature
Transmission Oil Temperature Limitations (Paragraph)
During any operating condition no maintenance action is required if main transmission oil temperature is in the precautionary range for 5 minutes or less.
Prolonged hovering in hot weather, 86F (30C) may cause main transmission 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.
