747 Misc Systems Flashcards
IRS aligns in how many minutes
10
IRS quick line does what and how
Clears positioners align then NAV, more accurate if position is entered.
IRS power source left, center, right
Ac bus 3 , ac bus 2, ac bus 1
IRS ATT
Loose V/S and A/S trend on PFD.
Required HDGing input on cdu
Standby power and battery on for interior safety inspection why
Primary EICAS for flat position indicator
Standby power to battery , what happens
Main and APU battery chargers are taken off line.
Isolates the standby busses from AC power to check effectiveness.
APU switch to on does what?
APU inlet door opens
Apu fuel valve opens
DC or #2 aft fuel pump starts
Arms APU bleed air isolation valve
Utility busses
How many 4
Turn one switch off turns two busses off
Battery switch on
Connects main hot battery buss to main battery bus.
Connects APU hot battery bus to Apu battery us.
Above bus’s Available as a back up power source to Maine and 8 PM you stand by buses respectfully
BTB in auto with ISLN light
AC bus removed from synch bus.
AC bus powered by its own generator.
Anything lost no only AC bus isolated DC isolation relay remains closed in auto position.
AC bus powered by its own generator.
Anything lost? no , only AC bus isolated DC isolation relay remains closed in auto position.
EXT1, APU1,APU2,and EXT2 all available
ground handling bus powered, #4 aux hyd pump
main cargo handling bus powered
aircraft can be loaded and serviced
Ground handling bus
Powered when avail lights on number 1 side
4, aux hyd pump
Lower lobe cargo loading equipment and lights
Fuelpanel
Ground service bus
Powered when on lights is illuminated on #1 side
Battery chargers
Service lights and plugs
Fuel pump Apu start
Ground service switch on 1L door powers the service bus through ground handling bus
Alternative way to power ground service bus
Switch by L1 door powers ground service bus through ground handling
Drive light on IDG
High temp,low pressures, high freq
Hyd system fault light
Low output psi
High hyd fluid temp
Low hyd reservoir qty
Demand pumps come on
On ground when flaps in transit
In flight when trailing edge flaps out of up 1 and 4
Edp output psi low
Fire handle- pulled only because of low psi
Fuel control switch cut off
Min in flight speed 4 engines out for hyd power
160 kts
Fire test
Cwead-
Cargo tested on power up
Engine tested on power up
Apu test on power up
Duct not monitor
Wheel well not monitored
Emergency lights powered by
Dc bus 4
15 min
Recharge takes 16 hours
Fuel xfr main 1 &4 used when
QRH for dual fuel main boost pump failure in same tank
Fire loops engine
“And” takes both loops to give fire indication
One loop inop , other will give fire indication if sensed
