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كابتن طيار
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تاريخ التسجيل: 22 - 01 - 2009
العمر: 55
المشاركات: 341
شكر غيره: 0
تم شكره 0 مرة في 0 مشاركة
معدل تقييم المستوى: 220
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PMDG 747-400 fuel planning
1 kg = 2.2 lb
Weights Pound (LB)
Dry operation weight (DOW)= 394088
Maximum zero-fuel weight (MZFW)= 542500
Maximum Take-off weight (MTOW)= 875000
Maximum Landing weight (MLW)= 630000
Payload = Pax-weight + Cargo-weight
ZFW= DOW + Payload < MZFW
================================================== ============
OSDI: Damascus
OYSN: Sanaa
Alternate: OYHD
Distance:1155nm, Time:03:15, weather: calm ,Pressure altitude: FL390 ft
From OSDI to OYSN Alt OYHD
================================================== ============
# Calculate ZFW
Pax-weight=46620 lbs
Cargo-weight=73500 lb
- Payload=46620 + 73500
PAYLOAD = ((120120 lb))
- ZFW=394088 + 120120
ZFW=((514208 lb)) < 542500 we are ok
================================================== ============
# Calculate Trip fuel
* For much better understanding please print out PMDG 02- Cruise and fuel planning manual
( Cruise and fuel planning 2-7 Table)
Trip length Pressure altitude(feet) FL390
______________________________________________
1400 3:21 72.6
______________________________________________
==Trip Fuel for 3:21 min = ((72600 lb))
================================================== ============
# Calculate Minimum landing fuel
( Cruise and fuel planning 2-13)
- Minimum landing fuel international = 24000 lb
- Minimum landing fuel domestic short haul = 19000 lb
Landing weight = ZFW + Minimum landing fuel
== Landing weight = 514208 + 19000
== Landig weight = ((533208 lb)) at OYSN
================================================== ============
# Calculate Alternate Fuel
( Cruise and fuel planning 2-9)
Nam to Alternate Time to alternate Landing weight at Alternate
__________________________________________________ _____________________
100 0:30 541 lb to 630 lb
__________________________________________________ ______________________
8800 lb
__________________________________________________ ______________________
== Alternate Fuel = ((8800 lb))
================================================== =================
# Calculate Contingency fuel
( Cruise and fuel planning 2-14)
Holdig fuel 60 min = 18000 lb
60 ------------------ 18000
45 ------------------ ?
45 x 18000
__________ = 13500 lb easy way to do it
60
== Holding fuel = ((13500 lb))
================================================== ===================
Now
- Planned landig weight= ZFW + Minimum landing weight + Alternate fuel + Contingency fuel
== Planned landing weight = 514208 + 19000 + 8800 + 13500
== Planned landing weight = ((555508 lb)) < 630000 we are ok
================================================== ====================
# Calculate Adjustment fuel
( Cruise and fuel planning 2-14)
- adjustment fuel = Planned landing weight - Table discription weight
== Adjustment fuel = 555508 - 475000
== Adjustment fuel = 80508
== Adjustment fuel = 80508 % 10000
== Adjustment fuel = 8.0508
( Cruise and fuel planning 2-7 Table)
FL390
_____
880bs/hr
== Adjustment fuel = 8.0508 X 880
== Adjustment fuel = ((7084.704 lb))
================================================== =======================
# Calculate Total fuel
- Total fuel= Trip fuel + Minimum landing fuel + Alternate fuel + Holding fuel + Adjustment fuel + Taxi fuel
== Total fuel = 72600 + 19000 + 8800 + 13500 + 7084.704 + 2200
== Total fuel = ((123184.7 lb))
================================================== =======================
# Calculate Take-off gross weight
Taxi out weight = Total fuel + ZFW
== Taxi out weight = 123184.7 + 514208
== Taxi out weight = ((637392.7 lb)) < 875000 lb we are ok to taxi out
- Take-off gross weight = Taxi out weight - 2200
== TOGW = 637392.7 - 2200
== TOGW = ((635192.7 lb))
================================================== ========================
# Calculate Reserves fuel
- Reserves fuel= Minimum landing fuel + Alternate fuel + Holding fuel + 1/2 Contingency fuel
== Reserves fuel = 19000 + 8800 + 6750
== Rserves fuel = ((34550 lb))
So please type in the fmc 34.55 for reserve.
================================================== ==========================
# Calculate Intial Cruise alititude
Eastbound = odd altitudes
Wesbond = even altitudes
Important TOGW= ((635192.7 lb))
( Cruise and fuel planning 2-9)
Maximum & Optimum Cruise Altitude
Altiude optimum Wt Maximum Wt Time to burn fuel Wt
FL370 600,000 lb 670,000 lb 1:22
So far our Intial altitude will be fl370 and after 1:22 we could make step climb to fl390
Tips fmc
ICAO type 2000
VNAV information about optimum Altitudes
Progress information about T/C , T/D , E/D, Step climb
So please make it your own way
Please take it or leave it
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