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Navigation Flashcards

1
Q

How much time is required for initial IRS alignment

A

Approximately 10 minutes at mid-latitudes

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2
Q

When the IRS Mode Selector is placed from OFF to the NAV position, what does the momentary illumination of the ON DC light indicate

A

The IRS alternate power source is available from the switched hot battery bus

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3
Q

What is the origin of the present position lat and long. Used in IRS alignment

A

Lat and long. Are selected from the database and entered by the crew

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4
Q

What is required for an IRS to automatically enter the NAV mode

A

All are required

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5
Q

What information is provided by the IRS in addition to present position, heading and attitude signals

A

Ground speed, ground track & wind data

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6
Q

Which IRS entries are subjected to the reasonableness test

A

Latitude & longitude

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7
Q

If,at the beginning of IRS alignment, the present position entry in the IRS fails the reasonableness test and the same position is re-entered, what indication does the crew see

A

The ALIGN light returns to steady ON

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8
Q

What condition may cause a reasonableness test failure when proper entry of present position has been accomplished

A

Aircraft has been moved to a different location with the IRS OFF

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9
Q

Which IRS entry or entries are cross checked by the system performance test

A

Latitude only

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10
Q

Which causes IRS alignment to be lost inflight

A

Moving the selector switch to ALIGN

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11
Q

After entering the present position during IRS alignment, what would indicate a reasonableness test failure

A

The ALIGN light flashes

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12
Q

What information is lost and can not be restored when inflight alignment of an IRS is lost

A

Present position

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13
Q

What are the normal electrical power sources for the IRS

A

The Standby AC bus for the left IRS & the No.2 Transfer bus for the right IRS

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14
Q

Which is correct for IRS backup source of electrical power

A

Left IRAs by the switched hot battery bus & right IRS by the switched hot battery bus for 5 minutes

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15
Q

Which statement is correct concerning IRS inflight present position

A

The crew can never update the IRS position inflight

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16
Q

What does an illuminated IRS DC FAIL light indicate

A

The IRS backup power source is not available

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17
Q

During the IRS initialization, if the reasonableness test fails, the ALIGN annunciator flashes. If the same wrong data is reentered a second time the ALIGN annunciator will continue to flash

A

False

18
Q

The pilot can update the current IRS lat and long any number of times without delaying alignment as long as the IRS has not entered the NAV mode

A

True

19
Q

What is true regarding the IRS

A

The IRS’s are the sole source of Attitude and Heading except for the Standby Compass and Standby Attitude Indicator

20
Q

What does the IRS performance test check

A

The latitude entered by the pilot

21
Q

Which statement describes the IRS

A

All answers are correct

22
Q

During normal IRS Alignment, the momentary illumination of the “ON DC” annunciator indicates____

A

The “ON DC” annunciator illuminates to indicate that the IRAs is capable of operating from it’s backup DC power source

23
Q

What is the power source for the right IRS when AC Transfer Bus #2 is lost

A

Switched hot battery bus for a maximum of 5 minutes

24
Q

Which of the following will cause a flashing ALIGN light on the IRS Mode Panel during alignment

A

All answers are correct

25
Q

During IRS alignment, all of the following will cause a flashing ALIGN light except

A

NAV database out of date

26
Q

During normal IRS Alignment, the momentary illumination of the “ON DC” annunciator indicates____

A

A successful self test to indicate that the IRS backup DC power source is available

27
Q

Which bus normally powers the left IRS

A

AC Standby Bus

28
Q

When IRS alignment is lost inflight, all___\ features are lost for the remainder of the flight

A

Track and groundspeed

29
Q

During takeoff with the flight director in the TOGA mode below 400ft, roll commands are for

A

Maintaining aircraft wings level

30
Q

What does an illuminated F/D master light indicate

A

Indicates which FCC provides logic to F/D & A/P modes

31
Q

What ensures that both the CAPT and F/O will have the same F/D VOR/LOC command guidance when the CAPT master F/D light is on

A

The same VHF frequency & course selection must be set on CAPT & F/O radios

32
Q

How is the master F/D determined with no A/P engaged

A

The first F/D turned on

33
Q

Both master lights on the Mode Control Panel ate illuminated at the same time when

A

The GA mode is engaged below 400 ft

34
Q

How is the F/D TO mode engaged

A

Place both F/D switches to ON & press either TO/GA switch

35
Q

What are the F/D pitch commands during the takeoff roll

A

10 degrees nose down until 60 knots, the 15 degrees nose up

36
Q

When the First Officer is flying an ILS approach using the “A” autopilot, the APP mode will follow signals from the #2 Nav radio

A

False

37
Q

When is the Flight Director Go-Around Mode armed

A

Below 2000 feet AGL

38
Q

During a dual autopilot approach (A/P GA mode) which are the FMA and MCP indications when the GA mode is engaged

A

TO/GA is annunciated,IAS/ MACH display blanks

39
Q

What is the initial F/D GA pitch command during a 2 engine missed approach

A

15 degrees nose up

40
Q

What A/T thrust is generated during a F/D GA when the TOGA button is depressed once

A

A/T engages in GA and advances thrust toward the reduced go-around N1 to produce a 1000-2000 fpm rate of climb

41
Q

How can the F/D APP mode be disengaged after the localizer and glideslope have been captured

A

All answers are correct

42
Q

What causes the F/D command bars to bias out of view

A

Automatically at 59 feet RA on an ILS approach

737 (17 decks)

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