Properties Flashcards
Start ITT
1000 C (5 sec)
Start TQ
N/A
Start Oil Pressure
200 max
Start N1
N/A
Start Np
N/A
Start Oil Temp
-40 C min
Idle TQ
3-8% ground; allowable torque range with Np stabilized and PCL at idle
Idle ITT
750 C
Idle ITT
750 C
Idle N1
60-61 ground
67 min flight
N1 values presented for PMU ON. With PMU OFF, N1 may may vary from these values
Idle Np
46-50 ground
Avoid stabilized ground operations from 62-80 Np
Idle Oil Pressure
90 min
Idle Oil Temp
-40-105 ground
10-105 flight
106-110 acceptable for ground operation at and below 20% torque
Takeoff/Max TQ
100 max
Takeoff/Max ITT
820 C
Takeoff/Max N1
104 Max
N1 values presented for PMU ON. With PMU OFF, N1 may vary from these values
Takeoff/Max Np
100 Max
Avoid stabilized ground operation from 62-80% Np
With PMU OFF, permissible maximum Np is 100 +/- 2%
Takeoff/Max Oil Pressure
90-120 psi
Normal oil pressure during steady state conditions is 90-120 psi. Operation at oil pressure less than 90 psi at flight idle or above is indicative of oil system malfunction
Takeoff/Max Oil Temp
10-105 C
Transient TQ
131% 20 sec
Torque at 131% is a materials limit above which damage to the engine may occur. Torque above 102% is indicative of a system malfunction
Transient ITT
870 20 sec
Transient N1
104 max
N1 values presented for PMU ON. With PMU OFF, N1 may vary from these values.
Transient Np
102% 20 sec
110% permissible at all powers for completion of flight in emergency
Avoid stabilized ground operation from 62-80% Np
Transient Oil Pressure
40-130 psi
Operation at this range permitted only during aerobatics or spins, and 15-40 psi for 5 sec with PCL at IDLE
Transient Oil Temp
106-110 C (10 min)
Amber Oil PX, idle
Between 15 and 40 psi, no time delay
Red Oil PX, Amber Oil PX, idle
15-40 psi, 5 sec or more
Red Oil PX, idle
Oil PX 15 psi or below
Amber Oil PX, above idle
40-90 psi, 10 sec
Red OIL PX, above idle
40 psi or below, no time delay
Hot start indications
High/rapidly rising ITT
Lower N1
Lower Np
Causes of Hot Start
PMU failure
FMU failure
Incorrect A/F mixture
Low battery
Hung Start indications
Slow rising ITT
Lower N1
Lower Np
Causes of a Hung Start
PMU failure FMU failure Incorrect A/F mixture Ignition system failure Starter failure Low battery
Indications of a No Start
No ITT indication
Lower N1
No Np indication
No torque indication
Causes of a No Start
PMU failure FMU failure Starter failure Ignition system failure Incorrect A/F mixture
Indications of Engine Failure
Initial: loss of power, rapid decay of N1, torque, and ITT, MASTER WARN lights and tones, propeller moves toward feather
Accompanying: rapidly decreasing ITT, Np, lower-than-normal oil pressure, engine noise, GEN, FUEL PX, OIL PX, OBOGS FAIL messages, possibly PMU FAIL and CKPT PX messages
Engine failure causes
Fuel starvation, mechanical failure, compressor stall
Indications of PMU Failure
Power step change, PMU fail and PMU STATUS messages, MASTER WARN light, aural tone
PMU Failure causes
PMU FAILURE
PMU malfunction
Uncommanded Feather indications
High torque, lower Np, PMU FAIL/PMU STATUS, engine vibration, engine noise
Uncommanded Feather Causes
Feather dump solenoid malfunction, loss of oil pressure, PIU failure, oil blockage
Engine Fire
FIRE AND WARN light aural tone F fluctuating oil pressure, oil temperature, or hydraulic pressure E excessive turbine temperature V visual indications (smoke or flames) E erratic engine operation R roughness or vibration