Navigation Flashcards
How much time is required for initial IRS alignment
Approximately 10 minutes at mid-latitudes
When the IRS Mode Selector is placed from OFF to the NAV position, what does the momentary illumination of the ON DC light indicate
The IRS alternate power source is available from the switched hot battery bus
What is the origin of the present position lat and long. Used in IRS alignment
Lat and long. Are selected from the database and entered by the crew
What is required for an IRS to automatically enter the NAV mode
All are required
What information is provided by the IRS in addition to present position, heading and attitude signals
Ground speed, ground track & wind data
Which IRS entries are subjected to the reasonableness test
Latitude & longitude
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
The ALIGN light returns to steady ON
What condition may cause a reasonableness test failure when proper entry of present position has been accomplished
Aircraft has been moved to a different location with the IRS OFF
Which IRS entry or entries are cross checked by the system performance test
Latitude only
Which causes IRS alignment to be lost inflight
Moving the selector switch to ALIGN
After entering the present position during IRS alignment, what would indicate a reasonableness test failure
The ALIGN light flashes
What information is lost and can not be restored when inflight alignment of an IRS is lost
Present position
What are the normal electrical power sources for the IRS
The Standby AC bus for the left IRS & the No.2 Transfer bus for the right IRS
Which is correct for IRS backup source of electrical power
Left IRAs by the switched hot battery bus & right IRS by the switched hot battery bus for 5 minutes
Which statement is correct concerning IRS inflight present position
The crew can never update the IRS position inflight
What does an illuminated IRS DC FAIL light indicate
The IRS backup power source is not available
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
False
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
True
What is true regarding the IRS
The IRS’s are the sole source of Attitude and Heading except for the Standby Compass and Standby Attitude Indicator
What does the IRS performance test check
The latitude entered by the pilot
Which statement describes the IRS
All answers are correct
During normal IRS Alignment, the momentary illumination of the “ON DC” annunciator indicates____
The “ON DC” annunciator illuminates to indicate that the IRAs is capable of operating from it’s backup DC power source
What is the power source for the right IRS when AC Transfer Bus #2 is lost
Switched hot battery bus for a maximum of 5 minutes
Which of the following will cause a flashing ALIGN light on the IRS Mode Panel during alignment
All answers are correct
During IRS alignment, all of the following will cause a flashing ALIGN light except
NAV database out of date
During normal IRS Alignment, the momentary illumination of the “ON DC” annunciator indicates____
A successful self test to indicate that the IRS backup DC power source is available
Which bus normally powers the left IRS
AC Standby Bus
When IRS alignment is lost inflight, all___\ features are lost for the remainder of the flight
Track and groundspeed
During takeoff with the flight director in the TOGA mode below 400ft, roll commands are for
Maintaining aircraft wings level
What does an illuminated F/D master light indicate
Indicates which FCC provides logic to F/D & A/P modes
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
The same VHF frequency & course selection must be set on CAPT & F/O radios
How is the master F/D determined with no A/P engaged
The first F/D turned on
Both master lights on the Mode Control Panel ate illuminated at the same time when
The GA mode is engaged below 400 ft
How is the F/D TO mode engaged
Place both F/D switches to ON & press either TO/GA switch
What are the F/D pitch commands during the takeoff roll
10 degrees nose down until 60 knots, the 15 degrees nose up
When the First Officer is flying an ILS approach using the “A” autopilot, the APP mode will follow signals from the #2 Nav radio
False
When is the Flight Director Go-Around Mode armed
Below 2000 feet AGL
During a dual autopilot approach (A/P GA mode) which are the FMA and MCP indications when the GA mode is engaged
TO/GA is annunciated,IAS/ MACH display blanks
What is the initial F/D GA pitch command during a 2 engine missed approach
15 degrees nose up
What A/T thrust is generated during a F/D GA when the TOGA button is depressed once
A/T engages in GA and advances thrust toward the reduced go-around N1 to produce a 1000-2000 fpm rate of climb
How can the F/D APP mode be disengaged after the localizer and glideslope have been captured
All answers are correct
What causes the F/D command bars to bias out of view
Automatically at 59 feet RA on an ILS approach
