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46 Cards in this Set
- Front
- Back
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IRS 2 purposes
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-attitude, heading, vertical speed (primary)
-LNAV (secondary) |
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Components of IRS
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-L/R IRU (3 laser gyros 3 accelrometers)
-mode selector unit -display |
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Which components get info from IRU?
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EADI, EHSI, IVSI, RDMI (off side)
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Power sources for L/R IRU?
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Primary AC, backup DC
L: AC standby bus; switched hot battery bus R: Transfer bus 2; switched hot battery bus (shuts down after 5 minutes) |
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How long for full alignment IRS?
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10 minutes while airplane is motionless. Attempts realign after 25 seconds, and sends message to scratchpad.
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FMC uses info from which IRU?
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Left, autoswitches to right
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During self test, what does ON DC light mean?
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5 seconds on means good backup power test.
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How find out minutes remaining on ALIGN?
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HDG/STS selected on IRS display unit, right data display window displays minutes remaining beginning at 7.
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What must you do to complete alignment?
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Enter PPOS via CDU or IRS display unit.
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Autopilot inputs when IRS transfer switch is in NORMAL? Not Normal?
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A autopilot via A flight computer gets pitch from LIRU and roll from RIRU. B gets pitch from right and roll from left.
Not in normal, each AP gets pitch and roll from selected IRU. |
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Inputs to ADCs? Outputs? Powered when?
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-Onside Pitot systems and TAT probe.
-Altitude, vertical speed, airspeed, Mach, true airspeed, tat, sat. -AC on aircraft |
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4 pitot systems?
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Captain, first officer, 1 aux, 2 aux
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Which systems are interconnected (in order to average pressure during turn/turb)?
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Capt and #1
FO and #2 |
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What does the alternate static system do?
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Provide input to alt standby airspeed and altimeter. Ports not heated.
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Where does SAT come from?
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#1 ADC
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What systems does FMS integrate and control? (4)
Integrate with (in addition)(5) |
-FMC
-autopilot flight director system (AFDS) -Autothrottle (A/T) -IRS -ADCs -EFIS -engine instruments -nav radios -airplane system sensors |
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FMC provides what margin in all target speeds and optimum/max altitudes?
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1.3 buffet margin
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Speed rules for FMC. 10,000', clean, cost index.
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-Nothing above 250kts
-nothing below 210kts -0-200 (0=MRC, 200=MaxCruse) |
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What logic for winds does FMC ECON use?
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Linear between 0 wind on ground and pilot entered at altitude
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Ways FMS gets positions?
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-Align, no radio updating
-runway prior to t/o: FMC POS UPDATE -airborne, radio update |
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FMC radio updating.
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-Both radios in AUTO, 10 closest w/in 200nm, best is DME-DME.
-1 radio in AUTO, uses MAN navaid and tries to find another w/AUTO radio. Or it might try agility tuning. -Both radios in MAN, tries to use selected for DME-DME. Othewise goes to VOR-DME (only w/in 25NM). -LOC: only <6000' and on LOC |
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What happens if FMS can't update its position for 10 minutes?
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scratchpad: IRS NAV ONLY
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what does VERIFY POSITION scratchpad message mean?
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significant disagreement between IRSs, FMC, and radio update position
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What do you have to have to use LNAV or MAP mode?
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At least one radio in AUTO.
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How do you perform a position check?
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FIX page data vs. raw data. Max enroute error is 2 NM, max terminal is 1NM.
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Left (Capt) IRU power sources?
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Pri: AC standby
Sec: switched hot battery bus (inv) |
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Right IRU power sources?
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Pri: transfer bus 2
Sec: switched hot battery bus |
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When AC is lost to IRU's, what happens?
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Power is automatically switched to DC. After 5 minutes, right IRU shuts down to conserve battery power. Associated ON DC light illuminates.
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Full alignment takes?
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10 minutes motionless. If motion is detected, attempts new alignment w/in 25 seconds.
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Where can you find time to align?
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Right data window, beginning at 7 minutes.
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Describe IRU shutdown cycle.
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Move knob to OFF, 30 second shutdown cycle. ALIGN light is illuminated during this time. Can be shutdown on AC or DC power.
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IRS transfer switch purpose?
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Supply systems info from one IRU if need be, or NORMAL operations which is respective IRU to onside systems.
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Height limit to radio altimeters?
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2500'
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What systems get info from the radalts?
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-FMC
-FCCs -rudder pressure reducer -thrust reverser system |
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In addition to the EADI and flight director system, and autopilot, what extra stuff gets info from #1 Radalt?
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-GPWS
-EGPWS -TCAS -PWS |
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VHF 1 powered by?
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DC standby bus.
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What does each pitot probe supply?
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One pitot and two static inputs.
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What hardware does the FMS include?
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One FMC and two CDU's
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Describe the FMC navigation database.
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All VOR/DME stations in UAL AORs and selected ILS facilities, airports, and runways.
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FMC command speed below 10,000? Clean configuration?
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250. Not less than 210.
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What does FMC POS UPDATE do?
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Updates a/c posit to end of departure runway.
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Agility Tuning is?
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When one radio is in MAN and FMC can't use it for position. Takes two other stations and switches between them every 5 seconds.
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What 3 things could cause flashing white ALIGN lights in your IRS?
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-significant diff btwn prev and entered present positions
-an unreasonable entry -10 minutes with no present position |
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What does ATT position do?
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30 second alignment process in the attitude mode. FLy straight and level. Provides attitude info to EADI and heading info (after manually input) to EHSI and offside RDMI.
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On POS INIT page, what does GMT mean?
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Displays from CAPT clock. If time is wrong, must enter correct time to initialize the FMC internal time reference.
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On TAKEOFF REF 1/2 page, what things are shown under PRE-FLT STATUS line?
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PERF INIT-reqd entries omitted
ROUTE-if not active DEPARTURE-if RTE page displays prompts for RUNWAY and VIA |
