Fuel Flashcards
primary fuel
jp4
alternate fuel
jp5
actual fuel
jp8
emergency fuel
av gas for 50 hours cumulative on engine
fuel capacity
206.5 usable, 208.5 max
quantity indicated how?
one transmitter in aft center fuel cell, two in right underfloor cell (one on either side of baffle)
describe low level float switch
left side, indicates low fuel state, between 130 and 240 lbs
boost pumps
supply fuel under pressure to engine driven fuel pump. one in each underfloor cell. electrically operated. rated at 8-25 psi.
ejector pumps
pump fuel over baffles from front to rear to supply boost pumps in all attitudes
manifold assembly
2 lines in, 1 line out
main fuel shutoff valve
electrically operated. manual override behind aft access panel
fuel filter light
clogged or impending bypass. land asa practical
components of FCU
metering section, computing section, overspeed governor driven proportion to Nf
engine driven fuel pump
dual element w/i fcu. either element can sustain engine operation. land asa possible if one fails though. work below 4600 ft
what happens when you pull starter trigger?
igniter solenoid, starter generator, starting fuel solenoid valve activated
start fuel switch
opens starting fuel solenoid valve. turn off at 500 C
main fuel switch
boost pumps, main fuel valve
Linear actuator and droop cam
incr-dncr switch. controls Nf rpm between 6000 and 6700
droop cam compensator
holds Nf at plus/minus 1%. “cruise control”
gov switch - emer power reduction
11-15%
how many atomizers?
22
primary fuel at what Ng?
8-12%
secondary fuel at what Ng?
28-32%
dump valve opens when?
<6psi
change over solenoid valve
allows selection of automatic or emergency modes
