FLIGHT INSTRUMENTS/NAVIGATION

Question 1

List, which Versatile Integrated Avionics (VIA) Unit normally provide data
to what DUs.

Answer 1

Two VIAs provide the following functions: data display, flight
management computing, central aural warning, master warning and
caution light activation, and flight data acquisition. The display function
converts data received from airplane systems to graphic display on the
DUs.
 Normally VIA-1 provides data for the DUs 1 - 3 (PFD, ND, and EAD).
VIA-2 provides data for the DUs 4 - 6 (SD, ND and PFD).
 In case of failure, either VIA unit will automatically provide data for all
DUs

Question 2

Have a general understanding of the Air Data System (pilot/static)
operations.

Answer 2

Three pitot tubes are located on the nose of the airplane, one each for
the Captain’s, First Officer’s and auxiliary pitot system.
 A rudder pitot tube, located on the leading edge of the vertical
stabilizer, provides pitot pressure to operate the rudder throw limiter.
 Two static plates, located on each side of the airplane, and
two alternate ports provide static pressure.
 During normal operation, the Captain’s pitot and static air data goes to
Air Data Inertial Reference Unit (ADIRU)-1, and the First Officer’s pitot
and static air data goes to ADIRU-2. Alternate static and auxiliary pitot
air data goes to the Integrated Standby Instrument System (ISIS).

Question 3

Understand the control functions and indications associated with the
Inertial Reference System (IRS) control panel.

Answer 3

 The inertial reference function of the ADIRU provides air data and
inertial reference information to the PFD and ND.
 A single IRS control panel located on the overhead panel controls the
ADIRUs.
 An independent back-up battery will provide power to ADIRU-2 for a
minimum of 30 minutes If the normal power is lost.
 The airplane battery powers ADIRU-1.
NAV OFF Light – amber Illuminates when:
1. ADIRU is off.
2. ADIRU is in align mode.
3. Primary ADIRU failure.
NAV OFF Light – amber Flashes if:
1. During alignment, ADIRU does not receive present position
initialization within 5 to 10 minutes of turn on.
2. Present position entry fails the comparison test with either the
stored or calculated present position.
Mode Selector
1. OFF - Turns ADIRU off.
2. NAV - Normal position. After initial power up, the align mode
starts automatically. Align mode takes about 10 minutes if present
position initialization has been done.
3. A 3-minute fast realignment is done by cycling the selector from
VOL 2
10.10.25 40
NAV to OFF to NAV within 5 seconds. Realignment is initialized
with the existing attitude and heading.

Question 4

Know how the are VORs are Normally Tuned and Manually Tuned and
how marker beacon volume is controlled:

Answer 4

Two VOR receivers are normally tuned automatically by the VIA
flight management computing function, but can be tuned manually.
 The identifiers of VORs currently providing update data to the VIA are
displayed on the FMS POS REF 2/3 page.
 The ND automatically displays the identifier/ frequency of the tuned
VORs.
Manual VOR tuning is accomplished on the FMS NAV RADIO page.
 VOR bearings and course deviation are displayed on the ND map
display. VOR frequency and selected course are displayed in the lower
left hand corner.
 Outer, middle and inner marker beacons are displayed by symbols on
the PFD. An aural tone sounds simultaneously with a symbol. Volume
for the marker beacon is controlled on the audio control panel.

Question 5

Understand Radio Altimeter System operation limits and operation:

Answer 5

The radio altimeter system provides terrain clearance (altitude) data
during approach, landing, or climbs.
 The altitude range of the system is from 2,500 feet to touchdown.
 The system consists of two radio altimeter receiver/transmitters and
antennas.

Question 6

Know the functions of the EIS displays / six DUs (1 thru 6).

Answer 6

DU1 and DU6 are the Primary Flight Displays (PFD).
 DU2 and DU5 are Navigation Displays (ND).
 DU3 is the Engine and Alert Display (EAD). The primary engine display
appears on the upper 2/3 of the EAD. Alerts appear on the lower 1/3 of the
EAD. The primary engine display is described in the Engines section. Alert
display is described in the Airplane General section.
 DU4 is the System Display (SD). The SD displays secondary engine data,
systems synoptic, status pages, miscellaneous pages, or consequences
pages. Pressing the associated cue switch on the EIS System Display
Control Panel (SDCP) changes the page.