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Boeing 777-200 Systems > Navigation > Flashcards

Navigation Flashcards

1
Q

What components make up the navigation system?

A
  • GPS
  • Air Data Inertial Reference System (ADIRS)
  • 2 VORs
  • 2 DMEs
  • 3 ILS
  • 2 ADFs
  • 2 ATC transponders
  • Weather radar
  • FMS
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2
Q

What does ADIRS calculated data include?

A
  • Position
  • Heading
  • Airspeed
  • Altitude
  • Attitude
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3
Q

Where is ADIRS calculated data information sent to?

A
  • Flight displays
  • FMS
  • Flight controls
  • Engine controls
  • Other systems requiring inertial or air data
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4
Q

What are the major components of the ADIRS?

A
  • Air Data Modules ( 6 ADMs)
  • Air Data Inertial Reference Unit (ADIRU)
  • Secondary Attitude Air Data Reference Unit (SAARU)
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5
Q

An alignment of the ADIRU is the calculation of the airplane’s relationship to:

A

True North

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6
Q

During flight, can the ADIRU be realigned?

A

No, it cannot

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7
Q

In flight, what happens to the ADIRU if the switch is inadvertently positioned to OFF?

A

System logic prevents the ADIRU from losing power if the switch is inadvertently positioned to OFF

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8
Q

What happens to the ADIRU if the airplane is stopped for an extended period of time? (> 7 min. 30 sec.)

A
  • Changes to automatic realign mode
  • Refines the alignment until the airplane moves again
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9
Q

What happens to the ADIRU when it’s in the realign mode?

A

ADIRU velocity and acceleration errors reset to zero

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10
Q

What does the SAARU provide a secondary source of critical flight data to?

A
  • Displays
  • Flight controls
  • Other systems such as the AFDC
  • Provides the only source of attitude data to the Standby Attitude Indicator
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11
Q

If the ADIRU fails, what does the SAARU automatically supplies?

A
  • Air Data
  • Attitude data to the PFD
  • 3 minutes of backup heading (SAARU bases the heading on the ADIRU’s last heading prior to failure)
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12
Q

What happens after the ADIRU has been failed for 3 minutes?

A

Backup heading is lost and heading must be set manually in the CDU POS INIT page 1/3 using the heading on the standby compass

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13
Q

What are the 4 VOR tuning statuses?

A
  • Automatic
  • Route
  • Procedure
  • Manual
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14
Q

How is the VOR in the route auto tuning mode tuned?

A

The navaid is the previous VOR or a down path VOR within 250 nm of the aircraft’s position

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15
Q

What are the 3 ways a VOR can be manually tuned?

A
  • Frequency or identifier alone
  • Frequency and course
  • Identifier and course
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16
Q

ILS remains in PARK until?

A
  • 200 nm from T/D
  • More than halfway to the destination

Whichever occurs first

17
Q

When does the ILS tuning status changes to A and ready to be used for approach guidance?

A
  • Aircraft less than 50 nm from the T/D
  • Aircraft less than 150 nm from the runway threshold
  • FMC is in the descent mode
18
Q

When do the LOC and GS pointers fill in solid magenta?

A

When the deviation is within 2 1/2 dots from the scale center.

19
Q

How many dot deviation do the rectangles display in the expanded LOC scale display?

A

1/2 dot

20
Q

Can ADF frequencies be tuned automatically?

A

No

21
Q

Where is the FMS-calculated guidance primarily displayed?

A
  • ND
  • Airspeed indicator
  • Altimeter
  • Thrust indicators
22
Q

What defines the polar regions?

A
  • North of 82 north latitude
  • Above 70 north latitude, between 80 and 130 west longitude
  • South of 82 south latitude
  • South of 60 south latitude, between 120 and 160 east longitude
23
Q

When the FMC transition to “on approach” mode?

A
  • FMC is in the descent phase and flaps are out of up
  • The first waypoint of an active instrument or VFR approach has been sequenced
  • A published missed instrument approach has been selected and incorporated in the active flight plan and the first waypoint on the published approach has been sequenced
  • The aircraft is on a direct-to or intercept-to waypoint and is within 12 nm of the runway threshold
  • The missed approach point is the active waypoint and the distance to go is less than 25 nm
24
Q

Weather radar returns are not displayed on the ND in what modes?

A
  • Plan
  • VOR Center
  • Approach Center
25
Q

If the ADIRU fails, what doe the SAARU automatically provide?

A
  • Air data
  • Attitude
  • 3 minutes of heading

Boeing 777-200 Systems (12 decks)

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