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A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PERFORMANCE
CRUISE
ONE ENGINE INOPERATIVE - GENERAL
A318/A319/A320/A321 FLEET PER-CRZ-OEI-GEN-10 P 8/8
FCOM 19 AUG 10
Determine on (Refer to PER-CRZ-OEI-ICQ-10 IN CRUISE QUICK CHECK LONG RANGE) time
and fuel consumption at ISA conditions and for a reference weight of 60 000 kg. Interpolate the
remaining air distance of 396 nm at FL 160.
Fuel : 2 622 kg
Time : 1 h 20 min
Correction due to actual in-cruise weight
◂Fuel = +22 kg per 1 000 kg above reference weight
◂Fuel = +22 kg × (79.1 – 55) ~ 420 kg
RESULT
Total Fuel = 872 + 2 622 + 420 = 3 914 kg
Time = 1 h 20 min + 22 min = 1 h 42 min
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PERFORMANCE
CRUISE
ONE ENGINE INOPERATIVE - GENERAL
A318/A319/A320/A321 FLEET PER-CRZ-OEI-GEN-15 P 1/44
FCOM 19 AUG 10
OBSTACLE STRATEGY
PROCEDURE
Applicable to: ALL
In order to maintain the highest possible level, the drift down procedure must be adopted.
This requires maximum continuous thrust on the remaining engine at green dot speed.
�� If, having reached drift down ceiling altitude, an obstacle problem remains,
the drift down procedure must be maintained so as to fly an ascending cruise profile.
�� If, after drift down, no obstacle problem remains,
the speed should be allowed to increase to long range speed and maintained. The subsequent
cruise should be made using either the long range speed by adjusting it as a function of aircraft
weight or by maintaining the initial cruise speed.
Note: Due to the fact that the long range speed is higher than the green dot speed, the cruise will
be made at an altitude lower than the drift down ceiling.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PERFORMANCE
CRUISE
ONE ENGINE INOPERATIVE - GENERAL
A318/A319/A320/A321 FLEET PER-CRZ-OEI-GEN-15 P 2/44
FCOM 19 AUG 10
EXAMPLE
Applicable to: ,
, MSN
GIVEN
GW at engine failure = 72 000 kg
FL at engine failure = 350
Temperature = ISA
Distance to destination airport = 1 500 nm
No wind
FIND
Level off (drift down ceiling) : 23 200 ft
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PERFORMANCE
CRUISE
ONE ENGINE INOPERATIVE - GENERAL
A318/A319/A320/A321 FLEET PER-CRZ-OEI-GEN-15 P 3/44
FCOM 19 AUG 10
Refer to PER-CRZ-OEI-GEN-15 GROSS FLIGHT PATH DESCENT AT GREEN DOT SPEED -
ISA
Distance : 315 nm
Fuel : 2 100 kg
Time : 57 min
LRC ceiling : FL 209
Refer to PER-CRZ-OEI-ALT-10 GROSS CEILINGS AT LONG RANGE AND GREEN DOT
SPEEDS
Cruise at long range speed (FL 200) to landing
(weight = 72 000 - 2 100 = 69 900 kg : Distance = 1 500 - 315 = 1 185 nm)
Determine on (Refer to PER-CRZ-OEI-ICQ-10 IN CRUISE QUICK CHECK LONG RANGE)
time and fuel consumption at ISA conditions for a reference weight of 60 000 kg. Interpolate the
remaining air distance of 1 185 nm at FL 200.
Fuel : 7 286 kg
Time : 3 h 44 min
Correction due to actual in-cruise weight
◂Fuel = +81 kg per 1 000 kg above reference weight
◂Fuel = +81 kg × (69.9 – 60) ~ 802 kg
RESULT
Total Fuel = 7 286 + 802 + 2 100 = 10 188 kg
Time = 3 h 44 min + 57 min = 4 h 41 min
EXAMPLE
Applicable to:
GIVEN
GW at engine failure = 62 000 kg
FL at engine failure = 350
Temperature = ISA
Distance to destination airport = 1 500 nm
No wind
FIND
Level off (drift down ceiling) : 25 400 ft
Refer to PER-CRZ-OEI-GEN-15 GROSS FLIGHT PATH DESCENT AT GREEN DOT SPEED -
ISA
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
PERFORMANCE
CRUISE
ONE ENGINE INOPERATIVE - GENERAL
A318/A319/A320/A321 FLEET PER-CRZ-OEI-GEN-15 P 4/44
FCOM 19 AUG 10
Distance : 267 nm
Fuel : 1 400 kg
Time : 48 min
LRC ceiling : FL 250
Refer to PER-CRZ-OEI-ALT-10 GROSS CEILINGS AT LONG RANGE AND GREEN DOT
SPEEDS
Cruise at long range speed (FL 250) to landing
(weight = 62 000 - 1 400 = 60 600 kg : Distance = 1 500 - 267 = 1 233 nm)
Determine on (Refer to PER-CRZ-OEI-ICQ-10 IN CRUISE QUICK CHECK LONG RANGE)
time and fuel consumption at ISA conditions for a reference weight of 55 000 kg. Interpolate the
remaining air distance of 1 233 nm at FL 250.
Fuel : 6 462 kg
Time : 3 h 42 min
Correction due to actual in-cruise weight
◂Fuel = +82 kg per 1 000 kg above reference weight
◂Fuel = +82 kg × (60.6 – 55) ~ 459 kg
RESULT
Total Fuel = 6 462 + 459 + 1 400 = 8 321 kg
Time = 3 h 42 min + 48 min = 4 h 30 min
　
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