Limits Flashcards
Hot Start TIT
830°-850°C
“Start” TIT
750°-830°C
Hot Start (Engine Inspection Required)
> 965°C
Cold Start TIT
<750°C
Cold Start TIT (Cease Engine Operation)
<720
“Start” Oil Pressure Indication
35% RPM
“Low RPM” TIT
410°-730°C
“Low RPM” RPM
71-73.8
“Low RPM” RGB Oil Pressure
50-250 (start and warmup)
“Low RPM” P/S Oil Pressure
100 (Start and Warmup)
50-60
*operation below 50 permitted (if within limits at 100°RPM)
“LOW RPM” Oil Temprature
60°-90°
- 100° (30 min in BETA) (5 min in ALPHA)
- 40°
- operation below 60° in cold weather permitted (oil press within limits)
“Low RPM” SHP
Minimum until oil temp is above 0°C
“Normal RPM” TIT
445°-645°C
“Normal RPM” RPM
96.3-99.1
“Normal RPM” RGB Oil Pressure
150-250 (start and warmup)
*operation below 150 permitted (RPM<100)
“Normal RPM” P/S Oil Pressure
100 (Start and Warmup)
50-60
*operation below 50 permitted (if within limits at 100°RPM)
“Normal RPM” Oil Temprature
60°-90°
- 100° (30 min in BETA) (5 min in ALPHA)
- 40°
- operation below 60° in cold weather permitted (oil press within limits)
“Normal RPM” SHP
1,000 max at oil temp 0°-40°C
“Max Reverse 0°” TIT
580°-790°C
“Max Reverse 0°” RPM
96.7-104.9
“Max Reverse 0°” RGB Oil Pressure
150-250
*operation below 150 permitted (RPM<100)
“Max Reverse 0°” P/S Oil Pressure
100 (Start and Warmup)
50-60
*operation below 50 permitted (if within limits at 100°RPM)
“Max Reverse 0°” Oil Temprature
60°-90°
*100° (30 min in BETA) (5 min in ALPHA)
40°
*operation below 60° in cold weather permitted (oil press within limits)
“Max Reverse 0°” SHP
1,000 max at oil temp 0°-40°C
“Flight Idle 34°” TIT
430°-705°C
“Flight Idle 34°” RPM
94.5-98.4
“Flight Idle 34°” RGB Oil Pressure
150-250
*operation below 150 permitted (RPM<100)
“Flight Idle 34°” P/S Oil Pressure
100 (Start and Warmup)
50-60
*operation below 50 permitted (if within limits at 100°RPM)
“Flight Idle 34°” Oil Temprature
60°-90°
*100° (30 min in BETA) (5 min in ALPHA)
“Flight Idle 34°” SHP
1,000 max at oil temp 0°-40°C
“Max 90°” TIT
1077 (5 min max)
3rd red line
“Max 90°” RPM
100 +/- 1
*momentary overshoot with power levers advanced allowed 96-106
“Max 90°” RGB Oil Pressure
250-150
“Max 90°” P/S Oil Pressure
50-60
“Max 90°” Oil Temprature
60°-90°
*100° (30 min in BETA) (5 min in ALPHA)
40°
*operation below 60° in cold weather permitted (oil press within limits)
*when 40° is reached and RGB show no fluctuation, max power can be applied
“Max 90°” SHP
4,600
5,300 (3 seconds)
T56-A-14 Starter Duty Cycle
1 min on - 1 min off
1 min on - 5 min off
1 min on - 30 min off
Fuel and Ignition Switches limits
- TIT below 200°C
- No Rotation
- Power Levers in Ground Start
- BETA Light on
Engine Shutdown wait period in Low RPM
2 minutes
-10 APU EGT
- 649 Continuous
- 710 Max Continuous (10 seconds)
- 732 Max Peak
APU RPM
98-102 (ground)
98-103 (flight)
Ground Air Duct Limits
5°-40°C
Normal Bleed Air Manifold Pressure prior to START
50 PSI
APU Overspeed Automatic Shutdown
106
What is the minimum bleed air manifold pressure at 16% RPM
25psi
Secure fuel and ignition switch if manifold pressure is less than 25psi at 16% rpm
During engine starts, when does fuel flow rise occur?
16%
At 16% fuel flow rises between ____ to ____ pph then drops to approximately ____ pph after ____ seconds.
700-1200 pph
500 pph after 2 seconds
When does lightoff occur (rise in tit)?
Between 16 and 33 percent (usually 24)
During engine starts, when does EDC PRESS LOW light go out?
Between 16 and 65 percent (usually 35)
During engine starts, when is oil pressure rise indicated on RGB and P/S indicators?
35 percent
During engine starts, when are you required to pull the starter?
57-64 percent
If prematurely pulled before 57, start may continue unless stagnant start occurs. Then no more starts may occur
During engine starts, when do parallel pumps light up?
Between 16-65 percent (usually 35)
During engine starts, when do parallel pump lights go out?
65 percent
During engine starts when does fuel press low light go out?
By low RPM
During engine starts, when does air manifold drop indicate?
At 16 percent, the valve failed to close.
During engine atarts, when do 5th and 10 stage bleed air valves close?
94 percent
What are the parameters for priming the engine prior to start?
- do not use if residual TIT is above 100°C
- if previous start went overtemp
- (if a successful start cannot be completed, a second start may be attempted using prime)
