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General Specifications
- -- 6 Main tanks- aft cabin, aft fuselage, 2 mid, and 2 wing tanks
- -- Each wing tank is divided into 3 sections; inboard, outboard, center
- -- Fuel flows from aft cabin => aft fuselage => right mid => left mid => wing tanks
- -- 12 pumps move fuel around
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Boost Pumps
- (2 electric boost pumps)
- -- Engine start to provide motive flow to primary jet pump
- -- X-feed to provide motive flow to primary jet pump
- -- Source of motive flow to forward transfer jet pump (fuel feed chamber volume below full, fuel feed pressure < 5 ± .5psi)
- -- Backup for primary jet pump
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Transfer Pumps
- (2 Electric Transfer Pumps)
- -- Operate continuously when respective generator is on, but fuel is only transferred as required
- -- Move fuel from Mid tanks to wing tanks
- -- Shut off automatically when mid tank or line pressure < 5.0 ± .5psi
- -- 6 motive flow pumps
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Motive Flow Pumps
- (6 motive flow pumps)
- -- 2 forward transfer jet pumps operate w/ boost pump on to move fuel from wings to fuel feed chamber
- -- 2 aft transfer jet pumps operate w/ primary jet pump on and/or boost pump on to move fuel from wings to fuel feed chamber
- -- 2 primary jet pumps operate w/ boost pump on and/or engine driven fuel pump to move fuel from fuel feed chamber to engines
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Engine-Driven Fuel Pumps
- (2 engine-driven pumps)
- -- Provide motive flow to primary jet pumps
- --580psi
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Ops Limits
- SL to 41,000ft
- - 40° - 50°C
- Total Gallons from pressure 771, from gravity 739
- Can use Jet –A/A-1/B, JP-4/5/8 must contain icing inhibitor
- Fuel imbalance
- -- Take-off/Touch and Go => 100lbs
- -- In flight/Land => 300lbs
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Notes and Caution
- -- Do not reset popped fuel system CB.
- -- Fuel quantity indicators at high AOA and/or angles of sideslip are inaccurate
- -- If fuel quantity indicators fail the needles move to a position below 0.
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Annunciators:
L and R WG TK OV PRESS
Difference of more than 3.5 ± .5psi between internal and external wing pressure
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Annunciators:
L and R FUEL LEVEL LO
Usable fuel in wing tank approximately < 200lbs/32gal
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Annunciators:
L and R FUEL PRESS LO
Fuel feed pressure below 5.0 ± .5psi
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Annunciators:
L and R FUEL FEED
Usable fuel in fuel feed chamber < 70lbs/11gal
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Annunciators:
L and R FLTR BYPASS
Pressure differential in fuel filter > 2.3 ±..2; means clogged filter and contaminated fuel
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Annunciators:
L and R XFR PRESS LO
Low pressure (5.0 ±. .5psi) in transfer line between mid and wing tanks
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Miscellaneous Information
- 3 Surge/Vent drains- 1 fuselage, 2 wing
- 11 Sump Drains
- Sniffle valves- allow both air and fuel to be vented (.1-.3psi pulls are in, 5psi lets fuel out)
- Float check valves- only vent air
- Pressure relief valves- Overpressure protection during single point refueling
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Fire Prevention
- -- Porous foam in fuselage tank
- -- Fuel/vapor leaks are routed overboard
- -- Flame arrestors in fuselage vent lines
- -- Flame arrestors separate cabin and fuselage tanks
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Checks Valves
- (13 check valves)
- 1 in each motive flow line (6)
- 1 Filler port
- 2 wing tank flow
- 2 vent line to surge tank
- 1 in each transfer pump (2)
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Flapper Valves
- (20 flapper valves)
- --9 in each wing tank
- --2 fuselage tank
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Shutoff Valves
- (6 shutoff valves)
- -- 1 each motive flow line from engine driven pump to primary jet pump
- -- 1 each main fuel supply line to engine
- -- 1 each X-feed line
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Drain Valves
- Sump
- De-fuel
- Filer port drain
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