Limits Flashcards
(48 cards)
Start Cycle (defn)
Starter initiation, acceleration in Ng, and starter dropout/disengagement. A 60 sec delay between start attempts is required any time a start is aborted, except during emergencies.
Crossbleed starts
The receiving engine shall be at or above 24% Ng prior to advancing PCL to idle.
Engine start with main rotor blades or tail rotor pylon folded is…
…PROHIBITED
Start TGT limit
851°C until idle speed is attained.
Engine operation with gust lock engaged is…
…PROHIBITED
Minimum planned fuel on landing shall be
no less than 600 pounds.
APU is not intended for _____. Operation of the APU in flight shall be limited to ________ ________ only. Acceptable in flight use includes:
routine in flight use
essential operations
- EPs
- Single-engine training
- Practice autos
- Powering ECS during extreme temp ops
Turbine Gas Temperature (TGT)
0-810°C - continuous - green
810-851°C - 30 min - yellow
851-878°C - 10 min - red
878-903°C - 2.5 min - red
903-949°C - 12 sec - red
949°C - max - red
Power Turbine Speed (Np)
<96% - avoid - red
96-105% - continuous - green (yellow above 101%)
105-117% - 20 sec - yellow
117-120% - 12 sec - yellow
120% - max - red
CAUTION: During engagement, extended operations in the 20-40% and 60-75% range may cause engine damage.
Main Rotor Speed (Nr)
<96% - avoid
96-101% - continuous - green
101-120% - precautionary - yellow
120% - max - red
123% - max for FCF only - red
127% - overspeed latch - red
Dual-Engine Torque (<80 KIAS)
0-120% - continuous - green
120-144% - 10 sec - yellow
144% - max - red
Dual-Engine Torque (>80 KIAS)
0-106% - continuous - green
106-127% - 10 sec - yellow
127% - max - red
NOTE: Dual engine torque limits apply when both engines > 65% torque.
Single-Engine Torque
0-135% - continuous - green
135-144% - 10 sec - red
144% - max - red
Gas Generator Speed (Ng)
0-102.2% - continuous - green
>102.2-106% - 2.5 min - yellow
>106-107% - 12 sec - red
107% - max - red
Transmission Oil Temperature
-50-105°C - continuous - green
105-120°C - precautionary - yellow
120°C - max - red
Transmission Oil Pressure
20 psi - minimum - red
20-30 psi - precautionary - yellow
30-65 psi (45-60psi in level flight) - continuous - green
65-130 psi - precautionary - yellow
130 psi - max - red
Engine Oil Temperature
-50-135°C - continuous - green
135-150°C - 30 min - yellow
150°C - max - red
Engine Oil Pressure
22 psi - minimum - red
22-26 psi - precautionary - yellow
26-100 psi - continuous - green
100-120 psi - precautionary - yellow
120 psi - max - red
Engine Start Limits
<16°C:
1st cycle - 60 sec
2nd cycle - 60 sec
3rd cycle - 60 sec
4th cycle - 30 min
16-52°C:
1st cycle - 60 sec
2nd cycle - 30 min
Engine Motor (ignition OFF)
Any temperature:
2 min on - 5 min off
2 min on - 30 min off
NOTE: Times for motoring are cumulative within a 5-minute period
Engine torques over ____ are displayed as red “XXX”.
150%
Transmission Oil Temp Limits (paragraph 1)
During any operating condition, no maintenance action is required if transmission oil temp is in the precautionary range continuously for 5 min or less.
Transmission Oil Temp Limits (paragraph 2)
Prolonged hovering in hot weather, 86°F (30°C), may cause transmission oil temp to rise into the precautionary range. Operation in the precautionary range for less than 30 min during any one flight under this condition is acceptable and no mx action is required.
Transmission Oil Pressure Limits (paragraph 1)
During steady-state level pitch attitudes (i.e., level flight) the transmission oil pressure should be 45-60 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 MAF.
1. Steady px outside of 45-60 psi, but within the normal limits of 30-65 psi.
2. Fluctuations not to exceed 10 psi, within the normal limits of 30-65 psi.
