Flight Mangagment and Navigation Flashcards

1
Q

What information do the IRSs provide?

A

position, ground speed, and attitude data.

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2
Q

Are they dependent on, or independent of, external navigation aids?

A

independent.

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3
Q

How is the GPS activated and what does it provide data for?

A

Auto activation. Independent geographical position to the FMC and time data to clocks.

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4
Q

With the FMC SOURCE select switch in NORMAL, which FMC is primary and what does it control?

A

Left, controls CDUs and auto throttle.

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5
Q

Describe the criteria for airports included in the nav database

A

One runway > 5000 ft long, 100 ft wide

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6
Q

When using the Auto throttle system, how are reference thrust limits calculated, how is thrust equalization
maintained?

A

By the FMC commands. FMC commands thrust equalization through the electronic engine controls

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7
Q

Where do the FMC’s receive their inertial data from?

A

FMCs receive inertial data from their on-side ADIRU

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8
Q

What does the FMC use to determine position?

A

GPS or inertial reference data or navigation radio position

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9
Q

If GPS data is not available, how does the FMC calculate present position?

A

IRS

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10
Q

FMC position updates from navigation sensor positions are used in what priority order?

A

GPS, DME x2, VOR DME, LOC DME, LOC

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11
Q

How does the FMC calculate a descent path during a VNAV PTH descent?

A

From BOD backwards, using Alt and Spd constraints, winds and A/Ice use

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12
Q

How can you further reduce a derated takeoff?

A

The N1 LIMIT page is used for assumed temp takeoff. Fixed takeoff and climb thrust derates may be
selected

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13
Q

What is the lateral navigation intercept criteria?

A

Anytime <3nm from FMC lateral course. >3nm must be <90 degree intercept, Intercept before valid
waypoint

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14
Q

When does IRS position and ground speed information become available and up to how long could it take?

A

In Nav mode, between 5-17 mins to align

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15
Q

What does an ALIGN light (white) on the IRS panel indicate?

A

IRS is in Alignment phase

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16
Q

What does a flashing ALIGN light (white) on the IRS panel during preflight indicate?

A

Bad or No position, Fault

17
Q

If IRS AC power has failed, how long can the right IRS operate?

A

5 mins

18
Q

If a system fault affecting the related IRS ATT and/or NAV modes has been detected, what indication will you
get?

A

Fault light

19
Q

On the Boeing 737-NG, how many GPS receivers are installed?

A

2

20
Q

What will happen if both ON DC lights (amber) lights illuminate?

A

. Both switch to backup DC power from the Switched Hot Battery Bus, IRS 1 powered for 60 mins, IRS 2
powered 5 minutes

21
Q

What could cause the call horn in the nose wheel well to sound while the aircraft is on the ground?

A

IRS is on battery power

22
Q

If position information while programming the FMC CDU on the ground is contradictory, what indication, if any,
will alert the crew to this?

A

Flashing White Align Light