NAV-RH-MODULE5

NAV-RH-MODULE5

1. Which of the following statements concerning the aircraft positions indicated on a triple fit Inertial Navigation System (INS)/Inertial Reference System (IRS) on the CDU is correct?

a) The positions will only differ if one of the systems has been decoupled
because of a detected malfunction
b) The positions will be the same because they are an average of three
difference positions
c) The positions are likely to differ because they are calculated from
different sources
d) The positions will only differ if an error has been made when inputting the
present position at the departure airport

2. After alignment, is it possible to update IRS positions?

a) Yes – by operation of the TO/GA switch, the runway threshold co-
ordinates are inserted into the IRS
b) Yes, the pilots can insert updates
c) Yes, theprocess is automatic in flight from the DMEs

3. Alignment of INS and IRS equipments can take place in which of the following modes?

a) ATT and ALIGN
b) NAV and
c) ALIGN and ATT
d) NAV and ATT

4. Which of the following statements concerning the loss of alignment by an Inertial Reference System (IRS) in flight is correct?

a) It is not usable in any mode and must be shut down for the rest of the
flight
b) The IRS has to be coupled to the remaining serviceable system and a
realignment carried out in flight
c) The mode selector has to be rotated to ATT then back through ALIGN to
NAV in order to obtain an in-flight realignment
d) The navigation mode, including present position and ground speed outputs, in inoperative for the remainder of the f

5. During initial alignment an inertial navigation system is north aligned by inputs from:

a) horizontal accelerometers and the east
b) the aircraft remote reading compass system
c) computer matching of measured gravity magnitude to gravity magnitude of initial alignment
d) vertical accelerometers and the north gyro

6. During the initial alignment of an inertial navigation system (INS) the equipment:

a) will accept a 10o error in initial latitude but will not accept a 10o error in
initial longitude
b) will not accept a 10o error in initial latitude but will accept a 10o error in initial long
c) will accept a 10o error in initial latitude and initial longitude
d) will not accept a 10o error in initial latitude or initial longitude

7. When initial position is put into an FMS, the system:

a) rejects initial latitude error, but it will accept longitude error
b) rejects initial longitude error, but it will accept latitude error
c) rejects initial latitude or longitude
d) cannot detect input errors, and accepts whatever is put in

8. Which of the following statements is correct concerning gyro-compassing of an inertial navigation system (INS)?

a) Gyro-compassing of an INS is possible in flight because it can differentiate between movement induced and misalignment induced accelerations
b) Gyro-compassing of an INS is not possible in flight because it cannot differentiate between movement induced and misalignment induced accelera
c) Gyro-compassing of an INS is possible in flight because it cannot differentiate between movement induced and misalignment induced accelerations
d) Gyro-compassing of an INS is not possible in flight because it can differentiate between movement induced and misalignment induced accelerations

9. The alignment time, at mid-latitudes, for an Inertial Reference System using laser ring gyros is approximately:

a) 5 min
b) 20 min
c) 2 min
d) 1

10. A pilot accidently turning OFF the INS in flight, and then turns it back ON a few moments later. Following this incident:

a) everything returns to normal and is usable
b) no useful information can be obtained from the INS
c) it can only beused for attitude refe
d) the INS is usable in NAV MODE after a position update

11. Which of the following statements concerning the alignment procedure for Inertial Navigation Systems (INS/Inertial Reference Systems (IRS) at mid-latitudes is correct?

a) INS/IRS can only be aligned in the ALIGN mode
b) INS/IRS can be aligned in either the ALIGN or NAV
c) INS/IRS can be aligned in either the ALIGN or ATT mode
d) INS/IRS can only be aligned in NAV mode

12. When and where are IRS positions updated?

a) During all phases of flight
b) Only on the ground during the alignment proc
c) When the FMS is in IRS ONLY NAV operation
d) When the VHF Nav Radios are selected to AUTO

13. After alignment of the stable platform of the Inertial Navigation System, the output data from the INS computer to the platform is:

a) rate corrections to the
b) accelerations from the accelerometers
c) attitude
d) latitude and longitude

14. The data that needs to be inserted into an Inertial Reference System in order to enable the system to make a successful alignment for navigation is:

a) airport ICAO identifier
b) aircraft heading
c) the position of an in-range DME
d) aircraft position in latitude and long

15. The full alignment of the stable platform on an Inertial Navigation System:

a) may be carried out on the ground or when in straight and level flight
b) may be carried out during any phase of flight
c) is only possible on the ground when the aircraft is at a complete
d) may be carried out at any time so long as an accurate position is inserted into the system

16. The drift of the azimuth gyro on an inertial unit induces an error in the position given by this unit. T being the elapsed time. The total error is:

a) sinusoidal
b) proportional to the square of time, t?
c) proportional to t/2
d) proportional

17. The azimuth gyro of an inertial unit has a drift of 0.01o/hr. After a flight of 12 hrs with a ground speed of 500 kt, the error on the aeroplane position is approximately:

a) 6 NM
b) 1 NM
c) 60 NM

18. The platform of an inertial navigation system (INS) is maintained at right angles to the local vertical by applying corrections for the effects of:

a) gyroscopic inertia, earth precession and pendulous oscillation
b) vertical velocities, earth precession, centrifugal forces and transport drift
c) movements in the yawing plane, secondary precession and pendulous oscillation
d) aircraft manoeuvres, earth rotation, transport wander and cor

19. Which of the following lists, which compares an Inertial Reference System that utilises Ring Laser Gyroscopes (RLG) instead of conventional gyroscopes, is completely correct?

a) The platform iskept stable relative to the earth mathematically rather than mechanically but it has a longer spin up time
b) It does not suffer from lock in error and it is insensitive to gravitational (g) forces
c) There is little or no spin up time and it does not suffer from lock in error
d) There is little or no spin up time and it is insensitive to gravitational (g) f

20. Comparing the Present Position display on the Boeing 737-400 FMC, you note that there is a 10-mile difference between the left IRS and the right IRS positions. This means that:

a) One system is in IRS ONLY NAV operation and the other has the VHF Nay Radios selected to AUTO
b) No special significance – this is normal
c) At least one of the IRS is dri
d) One position has been computer generated from radio nay positions whilst the other is raw IRS

21. Within the platform levelling loop of an earth-vertical referenced INS:

a) The levelling signals are unbounded, with a period of 84.4 seconds
b) The levelling signals are bounded with a period of 84.4 mi
c) The levelling signals are unbounded, with a period of 84.4 minutes
d) The levelling signals are bounded, with a period of 84.4 seconds

22. An aircraft equipped with an Inertial Navigation System (INS) flies with INS 1 coupled with autopilot 1. Both inertial navigation systems are navigating from waypoint A to B. The inertial systems Central Display Units (CDU) shows:
-XTK on INS 1 = 0 –XTK on INS 2 = BL (XTK = cross track)
From this information it can be deduced that:

a) the autopilot is unserviceable in NAV mode
b) only inertial navigation system No. 2 is drifting
c) only inertial navigation system No. 1 is drifting
d) at least one of the inertial navigation systems is dri

23. ATT Mode of the Inertial Reference System (IRS) is a back-up mode providing:

a) only attitude and heading inform
b) only attitude information
c) navigation information
d) altitude, heading and position information

24. Which of the following statements concerning the aircraft positions indicated on a triple fit Inertial Navigation System (INS)/Inertial Reference System (IRS) on the CDU is correct?

a) The positions will only differ if one of the systems has been decoupled
because of a detected malfunction
b) The positions will be the same because they are an average of three
different positions
c) The positions are likely to differ because they are calculated from
different so
d) The positions will only differ if an error has been made when inputting the
present position at the departure airport

25. In the Boeing 737-400 FMS, the CDU is used to:

a) manually initialise the IRS and FMC with dispatch inform
b) automatically initialise the IRS and FMC with dispatch information
c) manually initialise the Flight Director System and FMC with dispatch information
d) manually initialise the Flight Director System, FMC and Autothrottle with dispatch information

26. The period of validity of an FMS database is:

a) 56 days
b) one week
c) 28
d) varies depending on the area of operational cover

27. What are the positions (in the order left to right) on the Boeing 737-400 IRS MSU mode selector?

a) OFF STBY ALIGN NAV
b) OFF ON ALIGN NAV
c) OFF STBY ATT NAV
d) OFF ALIGN NA

28. With reference to an inertial navigation system (INS) the initial great circle track between computer inserted waypoints will be displayed when the control display unit (CDU) is selected to:

a) TK/GS
b) HDG/DA
c) DSRT
d) XTK/TKE

29. On a triple-fit IRS system, present positions on the CDU:

a) will only differ if one IRS has been decoupled due to a detected
malfunction
b) will only differ if an initial input error of aircraft position has been made
c) are likely to differ as the information comes from different so
d) will not differ as the information is averaged

30. Aircraft position determined by radio navigation in an FMC is derived from:

a) VOR/DME
b) DME ranges and/or VOR/ADF bearings
c) VOR/ADF
d) DME

31. Waypoints can be entered in an INS memory in different formats. In which of the following formats can waypoints be entered into all INSs?

a) Bearing and distance
b) Geographic co-ordi
c) Hexadecimal
d) By waypoints name

32. When is the last point at which an INS or IRS may be selected to NAV mode?

a) After passengers and freight are aboard
b) Immediately prior to push back or taxi from the
c) At the holding point
d) On operation of the TOGA switch when opening the throttles for the take-off

33. Which of the following correctly lists the order of available selections of the Mode Selector switches of an inertial reference system (IRS) mode panel?

a) OFF – ON – ALIGN – NAV
b) OFF – ALIGN – NAV
c) OFF – STBY – ALIGN – NAV
d) OFF – ALIGN – ATT – NAV

34. On the IRS, selection of ATT mode gives?

a) attitude and he
b) altitude, heading, and groundspeed
c) altitude, attitude, and heading
d) attitude information only

35. On an INS, what is the output of the E/W second-stage integrator?

a) Velocity N/S
b) Distance N/S
c) Distanc
d) Velocity E/W

36. Gyro-compassing of an inertial reference system (IRS) is accomplished with the mode selector switched to:

a) ATT/REF
b) STBY
c) ON

37. Which of the following statements concernikng the operation of an Inertial Navigation System (INS)/Inertial Reference System (IRS) is correct?

a) NAV mode must be selected prior to movement of the aircraft off the
b) NAV mode must be selected on the runway just prior to take-off
c) NAV mode must be selected prior to the loading of passengers and/or freight
d) NAV mode must be selected when the alignment procedure is commenced

38. What method of entering waypoints can be used on all INS equipments?

a) Distance and bearing
b) Waypoint name
c) Navaid identifier
d) Latitude and long

39. Gyro-compassing in an INS:

a) is possible in flight as the gyros can differentiate between acceleration due
to aircraft movement and initial alignment errors
b) is not possible in flight as the gyros can differentiate between acceleration
due to aircraft movement and initial alignment errors
c) is not possible in flight as the gyros cannot differentiate between
acceleration due to aircraft movement and initial alignment e
d) is possible in flight as the gyros cannot differentiate between acceleration
due to aircraft movement and initial alignment errors

40. In what formats can created waypoints be entered into the scratch pad of the B737-400 FMS?

a) Place Bearing/Distance, Place Distance/Place Distance, Along-Track
Displacement, Latitude and Longitude
b) Place Bearing/Distance, Place Bearing/Place Bearing, Across-Track
Displacement, Latitude and Longitude
c) Place Bearing/Distance, Place Bearing/Place Bearing, Along-Track
Displacement, Latitude and Long
d) Place, Place Bearing/Distance, Along-Track Displacement, Latitude and
Longitude

41. The sensors of an INS measure:

a) precession
b) velocity
c) the horizontal component of the earth’s rotation
d) acceler

42. What is the source of magnetic variation information in a Flight Management System (FMS)?

a) Magnetic variation is calculated by each IRS based on the respective IRS position and the aircraft magnetic heading
b) The main directional gyro which is coupled to the magnetic sensor 9flux valve) positioned in the wing-tip
c) The FMS calculates MH and MT from the FMC position
d) Magnetic variation information is stored in each IRS memory; it is applied to the true heading calculated by the respectiv

43. Where and when are the IRS positions updated?

a) During flight IRS positions are automatically updated by the FMC
b) Only on the ground during the alignment proc
c) IRS positions are updated by pressing the Take-off/Go-around button at
the start of the take-off roll
d) Updating is normally carried out by the crew when over-flying a known
position (VOR station or NDB)

44. Which of the following statements concerning the position indicated on the Inertial Reference System (IRS) display is correct?

a) It is updated when go-around is selected on take-off
b) It is constantly updated from information obtained by the FMC
c) It is not updated once the IRS mode is set t
d) The positions from the two IRSs are compared to obtain a best position
which is displayed on the IRS

45. Which of the following statements concerning the operation of an Inertial Navigation System (INS) /Inertial Reference System (IRS) is correct?

a) NAV mode must be selected prior to movement of the aircraft off the
b) NAV mode must be selected on the runway just prior to take-off
c) NAV mode must be selected prior to the loading of passengers and/or freight
d) NAV mode must be selected when the alignment procedure is commenced

46. What is the sequence of pages on start-up of the Boeing 737-400 FMS?

a) POS INIT, IDENT, DEPARTURES
b) IDENT, POS INIT
c) POS INIT, RTE, IDENT
d) IDENT, POS INIT, DEPARTURES

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