Fuels GK
Where do we find standard fuel loads for the KC-135?
1-C-135-5-1 Sec. V, Appendix C-5
How long in between receivers should the boom be stowed?
10 minutes
(-1 Systems Normal Operation: Engine Fuel Management 2-362)
Which of the following have the biggest impact on Range: Alt, Speed, CG, or Temp?
Speed
(-1-1 pg 1A5-5)
Why is an Aft CG preferable for range/cruise?
After CG moves the aircraft Center of Gravity closer to the Center of Lift of the Wing
(11-3 Fuel Efficiency AMCPAM pg.9)
What is the time limit for Main Tank Boost Pumps and Override Boost Pumps to be left on running “Dry”?
2 min and 5 min respectively, but the pumps *should* never be run dry
(-1 Systems Normal Operations: Fuel Systems 2-359-60)
Why do we have a Fuel Management Sequence?
-1 says “will” follow fuel management sequence. Also, optimized for best structural integrity and optimized fuel efficiency
(-1 Systems Normal Operation: Engine Fuel Management 2-362, Figure 2-20)
At +.09 Mach above Best Range Speed, how much does range decrease?
29%
(-1-1 Figure 1A5-1)
What CG is preferable for AR?
Forward CG, but doesn’t clearly define it (Rcvr KC-135s use between 22-25 MAC)
(3-3 6.2.4.1 and 6.6.7.4)
What type of fuel is JP-8?
Kerosene
(CASTv2 pg 61)
What legalese is there to allow us to “not” follow the Fuel Management Sequence?
“Operational Requirements or Emergencies”
(-1 Systems Normal Operation: Engine Fuel Management 2-362)
Flying 8,000’ below Best Range Altitude, how much does the range decrease?
9%
(-1-1 Figure 1A5-2)What does the Fuel Management Sequence denote as the CG to vary forward and aft of under 290K GW?
32%
(-1 Systems Normal Operation: Engine Fuel Management, Figure 2-20)
Can the AR Boost Pumps be left on at 0 fuel-load?
Yes, because they’re hydraulically lubricated instead of fuel-cooled
(CASTv2 pg 79)
Why do we burn from the body tanks before the mains?
Reduce Structural Fatigue on Wings/Spars
If you flew the KC-135 at Max Range at Max GW, how long could you stay airborne?
24hrs 50 minutes (charts plan on “No Wind”)
(-1-1 Figure 1A5-7)
What percentage does Range increase by having an Aft CG?
~2%
(11-3 Fuel Efficiency AMCPAM pg.9)
What is the max capacity of the Center Wing Tank?
48,716 lbs
(-5-1 Appendix C-5)
What is the CG Formula for moving gas?
CG = XX - FB - 1/3 CW + 2/3 AB (FB = 1:1, CW: 3:1, AB: 2:3)
(3-3 Table 4.3)
If you flew the KC-135 at Max Range at Max GW, how far could you fly?
11,015 miles (charts assume “No Wind”)
(-1-1 Figure 1A5-7)
What percentage of degrade is there for every pound of tankered fuel?
“For every pound of excess fuel carried, up to 3% more will be burned each hour”
(11-3 Fuel Efficiency AMCPAM pg.8)