ESV Study Guide Navigation Flashcards by Bobby Rommo

The IRS display unit is located on the ____.
a. Center Instrument Panel
b. Aft Electronics Panel
c. Captain`s Side Panel
d. Aft Overhead Panel

d. Aft Overhead Panel

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How long does a full IRS alignment take?
a. Approximately 5 minutes
b. Approximately 10 minutes
c. Approximately 15 minutes
d. From 5-17 minutes depending on latitude.

d. From 5-17 minutes depending on latitude.

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A steady white ALIGN light on the IRS Display Unit means ____.
a. an alignment fault is detected
b. the present position is inaccurate
c. alignment is progressing normally
d. the system is fully aligned

c. alignment is progressing normally

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A flashing white ALIGN light means ____.
a. no present position entered
b. unreasonable present position entry
c. both A and B are correct
d. alignment complete, ready for NAV

c. both A and B are correct

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How long can the Right IRS operate without AC electrical power?
a. 5 minutes
b. 30 seconds
c. 5 seconds
d. 30 minutes

a. 5 minutes

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If the amber FAULT light illuminates on the IRS Display Unit, it indicates the ____.
a. IRS has switched to ATTITUDE automatically
b. Airspeed has exceeded the VMO/MMO
c. ADIRU is in a self-test mode
d. related IRS system has detected a fault

d. related IRS system has detected a fault

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The VOR course is set on the ____.
a. Mode Control Panel
b. EFIS Control Panel
c. Aft Electronics Panel
d. FWD Overhead Panel

a. Mode Control Panel

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The VOR identification is displayed on the ____. a. VHF Navigation Control Panel
b. PFD
c. on-side FMC
d. Navigation Display

d. Navigation Display

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The right VOR information can be displayed and flown on the left ND by changing the ____.
a. VOR Standby Switch on the Aft Electronics Panel
b. IRS Switch on the FWD Overhead Panel
c. VHF NAV Transfer Switch on the FWD Overhead Panel
d. AUX NAV Switch on the Aft Overhead Panel

c. VHF NAV Transfer Switch on the FWD Overhead Panel

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DME frequencies are normally _____ tuned by the _____ as necessary for aircraft position updating. a. manually/VOR
b. manually/pilot
c. automatically/GPS
d. automatically/FMC

d. automatically/FMC

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____ ILS receiver(s) is/are installed on the B737. a. 1
b. 2 c. 3 d. 4

b. 2

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ILS course and glidepath are displayed on the pilots PFDs and ____. a. Nav Display in MAP mode
b. Upper Multi-Function Display
c. Standby Attitude Indicator
d. Lower Multi-Function Display

c. Standby Attitude Indicator

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Marker beacon information is displayed on ____.
a. the PFD or ND
b. the PFD only
c. both the PFD and ND
d. the ND only

b. the PFD only

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____ GPS receivers are installed in the B737. a. 1
b. 2 c. 3 d. 4

b. 2

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GPS provides position updates to the ____ and other aircraft systems. a. FMC
b. IRS c. ILS d. VOR

a. FMC

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The white ALIGN light will flash to indicate ____.
a. an error in initial position information
b. the IRS Mode Selector has been moved to OFF
c. normal alignment
d. alignment complete, ready for NAV

a. an error in initial position information

*In flight, attitude information may be restored following a fault by selecting ____. a. ATT
b. ALIGN c. NAV d. OFF

a. ATT

**In flight, the Master Caution Lights and the IRS Annunciation light illuminate. The indications to the right also occur which means that the _____.
a. Left IRS has failed and the unit is inoperative.
b. Battery Bus has failed since it is the DC power source for the left IRS
c. DC power source for the left IRS is not normal but the left IRS is still powered by the AC Standby
d. left IRS should continue to operate for 5 minutes and then fail

c. DC power source for the left IRS is not normal but the left IRS is still powered by the AC Standby

**Assuming no other IRS lights are illuminated, normal IRS operation can be restored by ____.
a. moving the left IRS Mode Selector to ALIGN and then back to NAV after 30 seconds
b. No action is possible. The left IRS will fail after 5 minutes
c. moving the left IRS Mode Selector to ATT and update the aircraft heading in line 5R in POS INIT
Page 1/3 of the CDU
d. No action is required. The IRS is operating normally

d. No action is required. The IRS is operating normally

**What is the back-up DC power source for the Left IRS?
a. The Switched Hot Battery Bus
b. The Hot Battery Bus
c. The DC Standby Bus
d. A 24-volt DC battery separate of the aircraft battery that has a 30-minute life span

a. The Switched Hot Battery Bus

**For aircraft 3RH-3VM, the IRS initialization procedure requires the pilot to:
a. Do nothing. The system has a hybrid GPS – inertial system and automatically enters the present
position.
b. Move the IRS selector to be set into ALIGN on the ground during preflight
c. Manually enter IRS position in the POS INIT page during preflight
d. None of the above

a. Do nothing. The system has a hybrid GPS – inertial system and automatically enters the present
position.

**While still at the gate you confirm that external power is connected. What additional conclusion can be made based on the indications shown?
a. The right IRS is unpowered.
b. The ground-call horn in the nose wheel well will not activate since normal AC power is on the busses.
c. The left IRS is powered by the AC Standby Bus.
d. AC power to the number 1 IRS has failed.

d. AC power to the number 1 IRS has failed.

**When an aircraft is parked at the gate, when else might you see this indication?
a. the ELEC Light is also illuminated due to a fault in the DC power system
b. this is a normal momentary indication during an IRS alignment self-test
c. the Battery Switch is OFF
d. the STANDBY POWER Switch is in BAT

b. this is a normal momentary indication during an IRS alignment self-test

** What should you conclude from these indications while the aircraft is at the gate? a. The left IRS will fail in five minutes.
b. The left IRS is not affected by this failure, however backup DC power has failed. c. The left IRS is being powered by the Switched Hot Battery Bus.
d. The right IRS has failed after being powered by the Switched Hot Battery Bus for more than 10 minutes.

c. The left IRS is being powered by the Switched Hot Battery Bus.

**For aircraft 3RH-3VM, inflight loss of alignment due to power interruption or inadvertent shutdown requires the pilot to: a. Do nothing. When power is restored, attitude reference information is restored after approximately 30 seconds due to AIM (Align in Motion). b. Use the ISFD. Primary attitude reference is lost c. Do nothing. The GPS receivers will provide attitude information d. None of the above.

a. Do nothing. When power is restored, attitude reference information is restored after approximately 30 seconds due to AIM (Align in Motion).

**How long can you expect Standby Power to last following a loss of both generators? a. A minimum of 15 min b. A minimum of 30 min c. A minimum of 45 min d. A minimum of 60 min

b. A minimum of 30 min

*30 seconds after placing the #1 IRS Mode Selector to ATT the FAULT Light extinguishes. Mag compass heading is 127. To enter and regain current aircraft heading the crew should enter ______. a. 127 degrees in Line 5R (SET IRS HDG) of POS INIT Page 1 of the CDU b. 117 degrees in Line SR (SET IRS HDG) of POS INIT Page 1 of the CDU c. the corrected Latitude and Longitude provided from the operating IRS in Line 1 R (LAST POS) of POS INIT Page 1 of the CDU d. the Reference Airport in line 1 L (REF AIRPORT) of POS INIT Page 1 of the CDU

a. 127 degrees in Line 5R (SET IRS HDG) of POS INIT Page 1 of the CDU

*The right (IRS #2) ON DC light has illuminated. What is a possible cause? a. Alignment has been lost b. The left IRS is being powered by the DC Standby Bus. c. AC Main Bus 1 has failed d. The right IRS is being powered by the switched hot battery bus.

d. The right IRS is being powered by the switched hot battery bus.

*This indication occurs at the gate because external power dropped off line and the aircraft is now on standby power. Select all of the indications (below) that would also be applicable. a. The Master Caution and IRS annunciator lights illuminate b. The ground call horn in the nose wheel well sounds. c. The BAT DISCHARGE light illuminates d. TRANSFER BUS OFF and SOURCE OFF lights illuminate.

Answer: A, B, C, D

*In this situation, the indication occurs in flight. Assuming no corrective action is available, which statement about the operation of each IRS is correct? a. The left IRS is inoperative. The right IRS is operating on battery power. b. The left IRS will operate on battery power once the right IRS shuts down after 5 minutes. c. The left IRS is operating normally. The right IRS will shut down in 5 minutes. d. The right IRS will operate for 30 minutes and the left IRS will shut down in 5 minutes.

c. The left IRS is operating normally. The right IRS will shut down in 5 minutes.

*This indication is observed in level flight. The left IRS Transfer Switch is in the NORMAL position. In this situation, the Left IRS is not providing accurate _____. a. information to the Captain's instruments and the left IRS must be turned OFF b. Attitude and heading information to the Captain's instruments. To restore attitude information, select ATT on the #1 IRS Mode Selector and maintain wings level and constant airspeed tor 30 seconds c. Information to the Captain's instruments. To restore the system, select ALIGN on the #1 IRS Mode Selector, then select NAV after the ALIGN Light extinguishes (approximately 30 seconds) d. Heading and attitude information to both the Captain's and First Officer's instruments. Move the IRS Transfer Switch to BOTH ON R to restore the FO's information

b. Attitude and heading information to the Captain's instruments. To restore attitude information, select ATT on the #1 IRS Mode Selector and maintain wings level

*The QRH directs you to place the #1 IRS Mode Selector to ATT. Once in this mode, the left IRS does not calculate ______. Select the most correct answer. a. acceleration or vertical speed, thus MAX deceleration should be selected on AUTO BRAKE Select Switch b. Position, ground speed, track, or winds. Heading is available after the ALIGN light is extinguished (approximately 30 seconds) c. acceleration, vertical speed, ground speed, track, position, heading, and winds d. All statements are correct.

c. acceleration, vertical speed, ground speed, track, position, heading, and winds

*To continue operations with the IRS Mode Selector Unit in this configuration, you must a. Monitor aircraft heading using a different source and periodically enter corrected heading in the CDU POS INIT Page or by selecting HDG/STS on the IRS Display Unit. b. Do nothing. The CDU will update corrected heading automatically from the ISFD c. Monitor aircraft heading using a different source and periodically reset corrected heading in the CDU POS INIT page. Also, select BOTH ON R with the IRS Transfer Switch d. Shut the left IRS off. Heading Information cannot be updated

a. Monitor aircraft heading using a different source and periodically enter corrected heading in the CDU POS INIT Page or by selecting HDG/STS on the IRS Display Unit.

*With the indications in flight on the left IRS panel, you should place the #1 IRS Mode Selector to ___. a. ALIGN while maintaining wings level for approximately 30 seconds, then move the selector back to NAV to regain attitude information b. ATT while maintaining wings level for approximately 30 seconds, then move the selector back to NAV to regain attitude information c. OFF momentarily, then move the selector back to NAV and maintain wings level and constant airspeed for approximately 30 seconds to regain attitude information d. ATT while maintaining wings level and constant airspeed for approximately 30 seconds and leave the IRS in ATT mode

d. ATT while maintaining wings level and constant airspeed for approximately 30 seconds and leave the IRS in ATT mode

*In this scenario, which statement below most accurately describes flight limitations with the aircraft in this configuration? a. Cat II and/or Cat Ill approaches are not authorized. b. Neither autopilot can be engaged. c. Alternate brakes are not available. d. Land ASAP before the backup DC power source from the Switched Hot Battery Bus depletes (minimum 30 minutes).

a. Cat II and/or Cat Ill approaches are not authorized.