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consumption
increase
whith possible
EGT overlimit
+ 10°EGT
=
+ 0.7% SFC
BLEED AIR AIR LEAKAGES
• 1% leakage, 9Th stage HPTCC bleed
  + 0.5% SFC
• 1% leakage, 9Th stage CUSTOMER bleed
  + 1.6% SFC
• VBV leakage, open 10°
  + 0.7% SFC
      Customer Bleeds Valves
VBV, HPTCC...
Peerrffoorrmaannccee Deetteerriiaattiioonn
85
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
TIP WEAR NOTCHES
HPT BLADE
1 Notch = 10°EGT margin loss
Performance Deetteerriiaattiioonn
86
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
TAKE CARE OF
YOUR ENGINES…
… AND KEEP YOUR
AIRCRAFT SAFE !!!
… YOU WILL SAVE
MONEY…
Performance Deetteerriiaattiioonn
87
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
REDUCED
TAKE OFF THRUST
Flight Ops Support
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Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
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Technical terms
RATED TAKE OFF THRUST (FAA AC 25-13)
The approved Engine Thrust (Name Plate)
TAKE OFF THRUST (FAA AC 25-13)
The Engine Rated Take Off Thrust or corrected
Derated Takeoff Thrust
Level less than the max. takeoff thrust. The value is considered a normal
take off operating limit.
Reduced Takeoff Thrust
Level less than the max. takeoff or Derated Take Off thrust. The thrust
setting parameter is not considered a takeoff operating limit.
Is at least 75% of the max. takeoff or Derated Take Off thrust.
RERATING
Is a manufacturer action changing the approved engine thrust (Name Plate)
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89
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
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Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
Reduced Thrust Versus Derate
 Reduced thrust takeoff
• V-speeds used protect minimum control speeds (VMCG, VMCA) for full thrust
• Reduced thrust setting is not a limitation for the takeoff, I.e., full thrust may be
selected at any time during the takeoff
 Derated takeoff
• Takeoff at a thrust level less than maximum takeoff for which separate limitations
and performance data exist in the AFM. Corresponds to an “alternate” thrust rating
• V-speeds used protect minimum control speeds (VMCG, VMCA) for the derated
thrust . . . not original maximum takeoff thrust
• The derated thrust setting becomes an operating limitation for the takeoff
 On some installations derated thrust and reduced thrust can be used together, e.g., a
derated thrust can be selected and thrust further reduced using the Flex temperature
method
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CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
-40%
-35%
-30%
-25%
-20%
-15%
-10%
-5%
0%
0 5 10 15 20 25 30 35 40
Delta Assumed Tempera ture Be yond Corner Point (deg C)
Delta % Thrust Reduction
CFM56-5A1
CFM56-5C4
CFM56-7B18
CFM56-7B22
CFM56-7B27
CFM56-5B3
CFM56-5B4
CFM56-5B6
Sea Level/ .25M/Corner Point Takeoff, Nominal HPX, Flight Inlet Ram Recovery
Max Climb would limit -5C4 to -23%, -5A1 to 26%
Max Allowable Der ate = 25%
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Thrust Reduction Vs. Flex/Assumed Temperature
92
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
Thrust for VMC speeds determination
Thrust
OAT
EGT limit
TREF
TOGA
rating
Derated
rating
Derated takeoff: Thrust for
VMC computation
TOGA or Flexible Takeoff: Thrust for VMC computation
Lower VMC speeds
when Derated takeoff
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Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
　
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