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116
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
Distance from start of roll
Air T°= 55°c
V1 CAS
=
140 Kts V1 TAS = 151.5 Kts
AIRCRAFT PERFORMANCE MARGIN WITH REDUCED
TAKEOFF THRUST IS ALWAYS CONSERVATIVE.
You compute at T = 55°
but
You fly at T = 10°
Air T°= 10°c
V1 TAS = 138.5 Kts
Reduced TTaakkeeOffff TThhrruusstt
Obstacle
clearance margin
Extra obstacle
clearance margin
• If performance is limited by the one engine inoperative minimum climb gradient requirements, the higher actual thrust will result in a higher climb gradient
• If performance is limited by obstacle clearance, the higher climb gradient combined with the shorter takeoff distance will result in extra clearance margin
117
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
Reduced Thrust Exemples
Reduced TTaakkeeOffff TThhrruusstt
Temperature (oC): 40 15 assuming 40
V1 (KIAS/TAS) 150/156 150/150
VR (KIAS/TAS) 151/157 151/151
V2 (KIAS/TAS) 154/161 154/154
Thrust at V1 (lb per engine) 17.744 17.744
F.A.R. field length - ft 9,468 9,002
Accelerate-stop distance 9,468 8,760
(engine out) (ft)
Accelerate-go distance 9,468 9,002
(engine out) (ft)
Accelerate-go distance 7,811 7,236
(all engine) (ft)
Second segment gradient % 2.68 2.68
Second segment rate of 438 419
climb – ft per minute
A320-200 (CFM56-5A1) at sea level, 15oC. The
actual takeoff weight permits an Flex temperature
of 40oC
118
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
Reduced Thrust Exemples
Reduced TTaakkeeOffff TThhrruusstt
Temperature (oC): 40 15 assuming 40
V1 (KIAS/TAS) 150/153 150/147
VR (KIAS/TAS) 158/162 158/155
V2 (KIAS/TAS) 159/165 159/158
Thrust at V1 (lb per engine) 23.451 23.451
F.A.R. field length - ft 9,459 8,859
Accelerate-stop distance 9,459 8,547
(engine out) (ft)
Accelerate-go distance 9,459 8,859
(engine out) (ft)
Accelerate-go distance 7,970 7,393
(all engine) (ft)
Second segment gradient % 2.4 2.4
Second segment rate of 401 387
climb – ft per minute
A321-112 (CFM56-5B2) at sea level, 15oC. The
actual takeoff weight permits an assumed
temperature of 40oC
119
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
More the difference between OAT and Flex Temperature is,
More Reduced TakeOff Thrust available...
1 - TakeOff performance margin 
2 - Safety 
3 - Maintenance Cost 
Reedduucceedd TTaakkeeOffff TThhrruusstt
124
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
Flight Ops Support
TTeecchhnniiccaall FFeeaattuurreess
Normal Operating Considerations
Flight phases, ops recommendations
Reedduucceedd TTaakkeeOffff TThhrruusstt
CFFM5566 Geenneerraall
EnnggiinneeCeerrttiiffiiccaattiioonn & TTeessttiinngg
Operational Characteristcs
EGTMargin, OATL
• Review by flight phase of normal
operating considerations
• If there are inconsistencies between
this presentation and the Flight Crew
Operating (FCOM) or the Aircraft
Operating Manual (AOM) the FCOM
and/or AOM take precedence
125
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
CFM56-5 FADEC Running Mode

FADEC exits start mode and enters run mode at 51% N2

FADEC remains in the running mode until N2 falls to 50% (flameout)

FADEC does not have the authority to close the fuel metering valve while in
the running mode

Once in the running mode, any modifications made to the fuel schedule during
the start cycle are reset

Ignition can be turned on anytime from the cockpit, and is automatically turned
on if a flameout occurs
• Dual ignition

Flameout is determined by N2 deceleration higher than the normal
deceleration schedule OR N2 dropping below ~55%
Noorrmaall Oppeerraattiioonn
126
Flight Operations Support
10 September 2005
CFM PROPRIETARY INFORMATION
Subject to restrictions on the cover or first pa ge
Starting Characteristics
Normal Start (All Numerical Values Are “Typical” Not Limits)
　
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