Powerplant Flashcards
Minimum reverse air speed
40 KIAS
Maximum reverse air speed
Reverse above 95 KIAS not recommended as reverse may not be available.
What precautions apply for reverse on unproved surfaces?
Reverse on unimproved surfaces should be accomplished carefully to prevent propeller erosion from reversed airflow
What precautions apply regarding the propeller levers when the engine is shut down?
Do not move the propeller levers into reverse while the inches are shut down as linkage damage could result.
What is the purpose of the amber RVS not ready annunciator?
Annunciates yellow when propeller levers are not in the high RPM, low pitch position with the landing gear extended.
What is the purpose of the L auto feather or R auto feather annunciator?
Annunciate green when auto feather is armed with power levels advanced above 90% N1.
What are the starting limitations?
Starting ITT 1090°C for two seconds
Minimum oil temperature -40°C
What are the low idle limitations?
Maximum observed ITT 660°C. High ITT at ground idle may be corrected by reducing accessory load and/or increasing RPM.
Gas generator N1 minimum 51%
Oil pressure minimum 40 psi
Oil temperature -40°C to 99°C
What are the high idle limitations?
Gas generator N1 70% approximately. Oil temperature 0 to 99°C.
What is takeoff and max continuous power limitation?
550 shaft horsepower
Torque 1315 foot pounds
Maximum observed ITT 695°C
Gas generator 38,100 RPM/101.5% N1
Prop RPM 2200 N2
Oil pressure 80 to 100 psi
Oil temperature 10 to 99°C. A minimum oil temperature of 55°C is recommended for fuel heater operation at takeoff power.
Cruise climb and Max cruise limitations
538 shaft horsepower
Torque 1315 foot pounds. Cruise torque values vary with altitude and temperature.
Maximum observed ITT 695°C
Gas generator RPM 38,100/101.5% N1
Prop RPM 2200 N2
Oil pressure 80 to 100 PSI
Oil temperature 0 to 99°C
Max reverse limitations
Reverse power operation is limited to one minute
Maximum observed ITT 695°C
Gas generator N1 88%
Prop RPM 2100 N2
Oil pressure 80 to 100 psi
Oil temperature 0 to 99°C
Transient limitation
Torque 1500 foot pounds these values are limited for two seconds
Maximum observed ITT 825°C for two seconds. High generator loads at low and one speeds may cause the ITT transient temperature limit to be exceeded observed generator load limits.
Gas generator RPM 38,500/N1 102.6%
Pro RPM 2420 N2
Oil temperature 0 to 99°C
What is the general footnote for oil pressure?
When gas generator speeds are above 72% N1 and oil temperatures are between 60°C and 70°C normal oil pressure is between 80 and 100 psi oil pressure between 40 and 80 psi is undesirable; it should be tolerated only for the completion of the flight and then only at a reduced power setting. Oil pressure below 40 psi is unsafe; it requires that either the engine be shut down or that a landing be made at the nearest suitable airport using the minimum power required to sustain flight.
