Study Guide: Flight Management, Navigation

Question 1

757/763: The FMC light illuminates when:

Answer 1

There is a FMC alerting message

Question 2

757/767: One of the IRS mode selector is positioned to ATT. This mode provides:

Answer 2

Only attitude and heading information

Question 3

757/767: The DC FAIL light is illuminated on the IRS mode selector panel for the left
IRU. This indicates that:

Answer 3

DC backup power for the related IRU has failed

Question 4

757/767: The ON DC light is illuminated on the IRS mode selector panel for the right
IRU. This indicates that:

Answer 4

Normal AC power for the right IRS has failed and the IRS is operating on DC backup power from the hot battery bus

Question 5

757/767: The FAULT light is illuminated on the IRS mode selector panel for the center
IRU. This indicates that:

Answer 5

A system fault affecting the center IRS ATT and/or NAV modes has been detected

Question 6

757/763: Three ILS receivers, tuned from a single control panel, are installed. The panel
tunes all three ILS receivers simultaneously. The center ILS receiver provides input to:

Answer 6

The standby attitude indicator (SAI)

Question 7

753/764: Which IRU(s) remain powered during standby power operations?

Answer 7

All three IRUs remain powered

Question 8

757/767: The ALIGN light is flashing on the IRS mode selector panel for the left IRU. This indicates that:

Answer 8

Alignment cannot be completed due to significant difference between previous and entered positions, an unreasonable present position entry, no present
position entry

Question 9

757/767: If the IRS reverts to DC power on the ground, the __________ to alert personnel of the high battery drain.

Answer 9

Ground crew call horn in the nose wheel well sounds continuously

Question 10

757/767: When first turned on, the IRU must go through a full alignment. Alignment
requires about _________ while the system determines level attitude and true heading.

Answer 10

10 minutes