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B777 Navigation > Navigation > Flashcards

Navigation Flashcards

Navigation

1
Q

How many GPS systems are installed on the 777?

A

2 (L & R systems).

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2
Q

Which CDU page shows the GPS position?

A

POS REF 3/3 page (displays L & R GPS position).

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3
Q

How can GPS position be displayed on the ND?

A

By selecting POS on EFIS control panel (ND displays L & R GPS symbols by combining them into a single symbol to show position).

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4
Q

What does the EICAS message “GPS” indicate?

A

Data FM both GPS systems are is unavailable or both systems have failed.

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5
Q

Can GS navigation data be inhibited?

A

Yes (use GPS NAV prompt on the POS REF page to inhibit data).

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6
Q

Is the ADIRU required for GPS navigation?

A

No

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7
Q

List 4 parameters supplied by the ADIRS?

A

• ACFT ALT. • Airspeed. • Attitude. • HDG

and position data for the displays

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8
Q

What components make up the ADIRS?

A

• ADIRU. • SAARU (Secondary Attitude Air Reference Unit). • Air data modules.

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9
Q

What bus power is required to turn the ADIRU on?

A

Battery bus power (and ADIRU switch on).

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10
Q

When can the ADIRU switch be used to turn the ADIRU off?

A

When airspeed < 30kts.

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11
Q

What conditions are required for the wheel well horn to sound?

A

Electrical power removed FM ACFT and battery switch turned off, the hot battery bus continues to supply electrical power to the ADIRU à ON BAT light illuminates à horn in LDG gear well sounds.

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12
Q

When can the aircraft be moved?

A

When ADIRU alignment process complete.

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13
Q

How can the ADIRU mode be verified?

A

On initial power-­‐up ADIRU enters align mode –> EICAS memo message ADIRU ALIGN MODE displays.

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14
Q

What scratchpad message would indicate a position entry error?

A

INERTIAL/ORIGIN DISAGREE (displays when latitude/longitude position not close to position of the origin airport).

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15
Q

When does the automatic realign mode occur?

A

If ACFT stops for an extended period of time.

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16
Q

What can the SAARU supply after an ADIRU failure?

A

• Attitude. • HDG. • Air data.

SAARU HDG must be manually set to the STBY compass magnetic HDG periodically

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17
Q

How long does the SAARU supply backup heading for?

A

3 minutes.

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18
Q

How will the crew know that a heading update is required?

A

CDU displays SET HDG prompt on the POS INIT page.

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19
Q

What is the pilot’s normal source for air data?

A

L, C & R pitot static systems.

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20
Q

What will provide pilot’s Air Data after failure of the ADIRU?

A

SAARU.

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21
Q

When does single channel Air Data occur?

A

When both ADIRU & SAARU air data invalid.

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22
Q

Which Air Data channel supplies the Standby Instruments?

A

C (Centre pitot & static ports).

23
Q

Can the ADFs be tuned automatically?

A

No (manually only).

24
Q

How are the DMEs turned manually?

A

When the VOR portion of a VOR/DME FREQ pair is entered on the NAV RADIO page.

25
Q

After a dual FMC failure, when is the DME tuned to an ILS DME?

A

When the related EFIS control panel mode selector is set to APP. In APP, the DME is tuned to the ILS (if not in APP, L DME is tuned W/ VOR on L CDU, R DME is tuned W/ VOR on R CDU).

26
Q

Which CDU page displays the DME stations being used for radio updating?

A

POS REF 2/3 displays identifiers of DME stations used for FMC position updates.

27
Q

With an approach selected, when will the ILS be autotuned?

A

Both must be met: • ILS, LOC, back course, LDA (localizer-­‐type directional aid) or SDF (simplified directional facility) APP have been selected to the active route.
• ACFT W/in 50nm FM ToD, 150nm FM LDG RWY threshold or FMC in descent mode.

28
Q

During an autoland, when does ILS tuning inhibit occur?

A

• Autopilot engaged and either LLZ or G/S captured. • Only F/D is engaged and either LLZ or G/S is captured and ACFT is BLW 500’ RA. • On GND, LLZ is alive, ACFT HDG W/in 45o of LLZ front course and GS > 40kts.

29
Q

With no inhibit, will the ILS automatically retune with selection of a new approach?

A

Yes (automatically retuned when ILS turning enabled and a new APP is selected on the CDU).

30
Q

When should the pilots audibly verify the identification of a tuned navigation station?

A

When the tuned FREQ remains displayed or an incorrect identifier displays.

31
Q

Does the FMC ever use a VOR/DME station for position updates?

A

Yes, but only when more accurate sources are not available.

32
Q

How are the VOR radios tuned after a dual FMC failure?

A

Tuned manually on the CDU ALTN NAV RADIO page (L VOR tuned W/ LEFT CDU, R VOR tuned W/ R CDU).

33
Q

Where can the VOR/DME station being used for radio updates be seen?

A

POS REF page 2/3 (displays identifier of VOR & DME FREQ pair used for position updates).

34
Q

In flight, when will the selected transponder activate beacon and altitude report?

A

When transponder mode selector is in XPNDR, TA ONLY or TA/RA.

35
Q

When will the transponder function for aircraft position monitoring on ground?

A

When transponder is active (not in off or STBY).

36
Q

What other functions can be enabled for the transponder?

A

Transponder may transmit: • FLT number. • Airspeed. • GS. • HDG oM. • ALT. • GPS position, etc.

37
Q

What EFIS modes are compatible with weather radar?

A

VOR (expanded), APP (expanded), MAP (expanded & centred).

38
Q

Which switch controls power to the weather radar transceiver?

A

EFIS control panel weather radar (WXR) switch.

39
Q

What type of turbulence can be detected by the weather radar?

A

Turbulence associated W/ precipitation (cannot sense CAT).

40
Q

What type of windshear detection is available from the weather radar?

A

Predictive windshear alerting (PWS).

41
Q

What type of advisories does TCAS provide?

A

• TA (TFC advisory). • RA (Resolution advisory).

42
Q

What EFIS modes are compatible with TCAS displays?

A

MAP (centred & expanded), VOR (expanded), APP (expanded).

43
Q

When will an RA be issued?

A

When another ACFT predicted to enter TCAS conflict airspace W/ approx.. 20-­‐30s.

44
Q

What is the vertical distance of proximate traffic?

A

1200’ (& 6nm).

45
Q

How is RA traffic avoidance ensured?

A

By adjusting or maintaining a pitch attitude and V/S outside the red RA regions.

46
Q

When should TA ONLY be selected?

A

During engine out operations (to prevent RAs when adequate thrust not AVBL to follow RA commands).

47
Q

What are GPWS immediate alerts based upon?

A

RA. • Barometric ALT. • ADIRS. • G/S deviation. • ACFT configuration.

48
Q

How is altitude calculated for look-­‐ahead terrain alerting?

A

By using a worldwide terrain database.

49
Q

Is estimated VNAV and LNAV path used in time to impact estimation?

A

No

50
Q

What terrain is displayed on the ND?

A

All terrain W/in 2000’ of ACFT ALT.

51
Q

How does selection of TERRAIN on one side and WXR on the other side affect the displays?

A

Each ND display updates on alternating sweeps (terrain and WX radar cannot be simultaneously displayed on the ND).

52
Q

Which system displays immediate windshear alerts?

A

GPWS.

53
Q

When are PWS alerts enabled?

A

• 12s after WX radar begins scanning for windshear. • BLW 1200’ RA

54
Q

Does PWS require the weather radar to be switched ON?

A

No (WXR switch does not have to be selected).

B777 Navigation (1 decks)

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