CAE SimuFlite Citation Bravo, Pilot Training Manual

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Flight Planning
Citation Bravo
Developed for Training Purposes
4-11
September 2005
CAE SimuFlite
Maximum Cruise Thrust
CONDITIONS: Cruise – 89.9% N1 Cruise Altitude – 39,000 FT
4-1
4-12
Although the Maximum Cruise Thrust table ( Figure 4-1A ) for 85.1%
N1 at 19,000 ft only starts at a trip length of 200 NM, we can use it
after subtracting fuel and time for 100 NM of cruise distance and sub-
tracting 200 lbs of taxi and takeoff fuel.
1. Enter the table from the left with a stage length of 200 NM and a
takeoff weight of 12,500 lbs .
2. Move right under zero wind for an approximate fuel burn of 1,215
lbs and a time of 0.82 hrs .
Use the Cruise table for 19,000 ft ( Figure 4-1B ) to determine the cruise
time and fuel for the 100 NM not flown.
3. Enter the table from the left with the appropriate weight (12,000 lbs)
and desired fan RPM (85.1% N1).
4. Move right and read the figure for fuel flow ( 1,432 lbs/hr ).
100 NM divided by 362 = 0.276 (rounded up to 0.28 hrs or 17 minutes),
then times 1,432 lbs/hr fuel flow = 395.5 lbs (or 396 lbs).
So, the alternate time calculates to 0.82 – 0.28 = 0.54 hrs (or 33 minutes);
fuel calculates to 1,215 – (200 + 396) = 619 lbs.
Add these results to the original destination figures for a total to alternate
of 2,902 lbs + 619 lbs = 3,521 lbs and 2.76 hrs + 0.54 hrs = 3.3 hrs (or 3
hrs, 18 minutes).
Reserve fuel, required for FAR 91.167 (a)(3) (:45 min. @ Normal
Cruise), is obtained from
Figure 4-1B
. Fan setting is 79.8% N1 and
fuel burn is 1189/hr., or 891# in 45 min. Reserve fuel of 45 minutes at
cruise power is based upon FL190 and normal cruise power thereafter,
or 891 lbs. This seemingly conservative number allows for the required
reserve under the worst-case scenario.
This yields summary estimates of 3.3 hrs and 4,412 lbs fuel.
After aircraft loading and flight plan fuel requirements are determined,
takeoff, climb, and landing gross weights should be rechecked for com-
pliance with Flight Manual criteria.