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

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OSDI: Damascus
OYSN: Sanaa
Alternate: OYHD

Distance:1155nm, Time:03:15, weather: calm ,Pressure altitude: FL390 ft

From OSDI to OYSN Alt OYHD

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# 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

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# 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))

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# 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

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# 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))

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# 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))


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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

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# 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))

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# 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))

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# 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))

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# 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.

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# 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

رد: PMDG 747-400 fuel planning