Limits Flashcards
What is defined as engine start?
Starter initiation, acceleration of Ng, and starter dropout/disengagement.
What is the required delay between start attempts after an aborted start?
60 seconds, except during emergencies.
What is required for crossbleed starts?
The receiving engine shall be at or above 24% Ng prior to advancing to IDLE.
Are engine starts with main rotor blades or tail rotor pylon folded allowed?
No, they are prohibited.
What should be done if an operational limit is exceeded?
An appropriate entry shall be made on a maintenance action form (MAF) stating what limit(s) were exceeded.
What should the crew do if a red ‘XXX’ is displayed due to an exceeded limit?
The crew shall land as soon as practicable.
What is the TGT limit during engine start?
851°C until idle speed.
What is the engine start procedure for temperatures below 16°C OAT?
Engaged once - 60 sec disengaged; Engaged twice - 60 sec disengaged; Engaged 3x - 60 sec disengaged; Engaged 4x - 30 minutes disengaged.
What is the engine start procedure for temperatures between 16-52°C OAT?
Engaged once - 60 sec disengaged; Engaged twice - 30 minutes disengaged.
What is the engine motor procedure with ignition OFF at any temperature?
Engaged - 2 mins / Disengaged - 5 mins; Engaged - 2 mins / Disengaged - 30 mins.
Is engine operation with gust lock engaged allowed?
No, it is prohibited.
What are the TGT ranges and limits?
0 to 810 °C = Continuous / Green; 810 to 851 °C = 30 min / Yellow; 851 to 878 °C = 10 min / Red; 878 to 903 °C = 2.5 min / Red; 903 to 949 °C = 12 sec / Red; 949 °C = MAX / Red.
What are the Power Turbine Speed (Np) limits?
< 96% = Avoid / Red; 96-105 = Continuous / Green or Yellow above 101%; 105-117 = 20 secs / Yellow; 117-120 = 12 secs / Yellow; 120 = Maximum / Red.
What caution should be noted during engagement of Power Turbine Speed?
Extended operations in the 20-40% and 60-75% ranges may cause engine damage.
What are the Main Rotor Speed (Nr) limits?
Less than 96% = Avoid / Red; 96 to 101% = Continuous / Green; 101 to 120% = Precautionary / Yellow; 120% = Max / RED; Greater than 120% = 123% is FCF MAX / RED; 127% = Overspeed Latch / Red.
What are the Dual-Engine Torque (TRQ) limits at <80 KIAS?
0 to 120% = Continuous / Green; 120 to 144% = 10 Seconds / Yellow; 144% = Maximum / Red.
What are the Dual-Engine Torque (TRQ) limits at >80 KIAS?
0-106% = continuous / green; 106-127% = 10 seconds / yellow; 127% = maximum / red.
What are the Single-engine Torque (TRQ) limits?
0-135% = Continuous / Green; 135-144% = 10 secs / Red; 144% = Max / Red.
What are the Gas Generator Speed (Ng) limits?
0-102.2% = continuous / green; >102.2-106% = 2.5 minutes / yellow; >106-107% = 12 seconds / red; 107% = maximum / red.
What are the Transmission Temperature (XMSN T) limits?
-50 - 105ºC = Continuous / Green; 105 - 120ºC = Precautionary / Yellow; 120ºC = Maximum / Red.
What is the minimum Transmission Pressure (XMSN P)?
20 PSI = minimum / red.
What are the Transmission Pressure (XMSN P) limits?
20-30 PSI = idle and transient / yellow; 30-65 PSI (45-60 PSI in level flight) = continuous / green; 65-130 PSI = precautionary / yellow; 130 PSI = maximum / red.
What is the acceptable fluctuation for Transmission Pressure during steady-state nose-high pitch attitudes? Fix this one
Fluctuations acceptable - including momentary dips below 30 psi and below 20 psi for up to 1s.
What does zero oil pressure indicate in rotor engagement?
It may indicate no-oil flow and is limited to less than 1 min and requires MAF write-up.
What are the Engine Oil Temperature (ENG OIL T) limits?
-50 - 135ºC = Continuous / Green; 135 - 150ºC = 30 Minutes / Yellow; 150ºC = Maximum / Red.
What are the Engine Oil Pressure (ENG OIL P) limits?
22 psi = Minimum / Red; 22 - 26 psi = Precautionary / Yellow; 26 - 100 psi = Continuous / Green; 100 - 120 psi = Precautionary / Yellow; 120 psi = Maximum / Red.
What is the minimum fuel requirement?
No less than 225 lbs (approximately 20 mins) per main tank.
What are the AOB limits when <300lbs of fuel per main tank?
> 30 degrees balanced flight.
APU Use
Not intended for routine in-flight use. Op of the APU in flight SHALL be limited to essential ops only.
Emergency procedures, Single engine training, Practice autos, Power ECS during extreme temperatures.
APU Limits - Rotors not engaged
Continuous use up to 51 C.
APU Limits - Rotors engaged
Continuous use up to 43 C. 30 mins between 43 and 60 C.