Powerplant Limitations Flashcards
Maximum take off N1
98.6
Max. TO N2
99.4
Max TO ITT
-3A -3A2
871°C
900°C
Time limit for ITT
5 minutes
2 minutes
Engine Type
To General Electric CF 34–3A 2
Normal TO N1 Limit
96.2
Normal TO N2 Limit
98.3
Normal take off ITT limit
856°C
878°C
-3A -3A 2
Normal take off time limit for ITT
Five minutes
Two minutes
Maximum continuous N1
98.6
Maximum continuous N2
99.2
Maximum continuous ITT
860°C
Max. Start/relight ITT
930°C
903°C
– 3A – 3A2
Maximum idle in icing conditions (cowl anti-ice only) N2
64.0
The APR system must be selected off for take off if
- Preflight static or dynamic tests fail
- Ambient temperature is below -20c (-4F)
Oil temperature
Minimum for starting
-40°C
Oil temperature maximum permissible
163°C (15 minutes maximum)
Oil temperature maximum for single engine climb
155°C (60 minutes maximum)
Oil temperature maximum continuous
150°C
Oil pressure transient coldstart
115 psi (10 minutes maximum) Engine must remain at idle until oil pressure returns to normal range
Oil pressure minimum at steady state Idle
25 psi
Oil pressure Minimum at take off (power)
45 psi
Oil pressure maximum continuous
110 psi
Starter duty cycle
Normal engine start
Three consecutive engine start cycles with five minutes cooling between additional cycles
Starter duty cycle
Motoring and engine start at -30°C -22°F and below
Motor engines for 60 seconds and assure fan rotation; then two consecutive engine start cycles with five minutes cooling between additional cycles
Starter duty cycles
Motoring with the engine fuel and ignition off
90 seconds with five minutes cooling between additional cycles of 30 seconds
For air turbine starts on the ground (at initiation of thrust Lever movement)
ITT is to be 120°C or less
N2 must be 20% or greater
For air turbine starts in flight (at initiation of thrust Lever movement)
ITT is to be 90°C or less
N2 must be 28% or greater
For windmill starts
ITT must be 120°C or less
Above 10,000 feet, N2 must be 13% and stable or increasing for all engine types
At or below 10,000 feet, N2 for applicable engine type must be as shown on table
Take off with engine fuel temperature indications is prohibited below
5°C , 41°F
APU maximum RPM
110%
The APU over speed control will automatically shut down the APU at
110%
APU maximum EGT
732°C
Minimum ambient temperature for starting a cold soaked APU on the ground
-40°C
The following APU start cycles are permitted using aircraft batteries on the ground or for normal in-flight start
- 3 start attempts, ea. of 30 seconds continuous cranking,
- 20 minute off time
- 2 further attempts each of 30 seconds continuous cranking
Then 35 minutes
APU start cycles permitted using ground power
2 start attempts 15 seconds each
20 minute off time
To further attempts 15 seconds each
Then 35 minutes
The APU ready light must eliminate within how many seconds
60 seconds of operating the APU start switch
APU maximum EGT not to be exceeded under any operating conditions
974°C
APU starting and operation is permitted within the following envelope.
Sea level to 10,000 ft:
0-290 kias
10,000 to 20,000 ft :
141-290 kias
APU bleed air extraction is not permitted above
Or when ..
14,500 ft pressure alt.
Not permitted in flight whenever standby electrical power is required from the APU.
Max permissible load on the APU generator in flight is
30 kVA
Fan Speed RPM indicator N1 % RPM
Green vertical band - 0 - 98.6
Red radial line - 98.6
ITT red radial line
928°C
ITT yellow vertical band
860°C - 928°C
ITT green vertical band
0 - 860C
ITT L/R read over temperature warning lights
928°C
Turbine speed rpm indicator N2 % RPM
Red radial line
99.4%
Turbine speed rpm indicator N2 % RPM
Yellow vertical band
99.2 to 99.4%
Turbine speed rpm indicator N2 % RPM
Green vertical band
0 to 99.2%
Fuel flow rate indicator
Green vertical band
0 to 4000 pounds per
Oil temperature indicator
Red radial line
163°C
Oil temperature indicator
Yellow horizontal band
150 to 163°C
Oil temperature indicator
Green vertical band
-42 to 150°C
Low oil pressure warning lights illuminate when
Oil pressure drops below 28. +or- 3 PSI
Oil pressure indicator
Green vertical band
25 to 115 psi
Oil pressure indicator
Red radial line
130 psi.
Oil pressure indicator
Green vertical band
25 to 115 psi
Fuel temp. Indicator
Green band
4 to 120C
Fuel temp. Indicator
Yellow band
-55 to 4C
Engine vibration indicator
Yellow band
2.7 MILS D.A. To. 4.0 MILS D.A.
Engine vibration indicator
Green Band
0 MILS D.A. To. 2.7 MILS D.A.
APU tachometer indicator percent RPM
Red radial line
110%
APU tachometer indicator percent RPM
Green arc
0 to 105%
APU EGT temp.
Red line
730C
APU EGT
GREEN ARC
0 to 680C
AC gauge
Green arc
0 to 30 kVA
DC Gauge
Green arc
22 to 29 volts