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Flashcards in SWA B737 - Navigation Deck (18)
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1
Q

(Navigation) What does the Inertial Reference System (IRS) compute?

A
  • Airplane Position
  • Ground Speed
  • Attitude Data
2
Q

(Navigation) How many Inertial Reference Units comprise of the Inertial Reference System (IRS)?

A

Two - and one Mode Select Unit.

3
Q

(Navigation) What Reference Data do the Inertial Reference Units (IRU’s) provide for the aircraft avionics?

A
  • Pitch and Roll
  • Heading
  • Acceleration
  • Wind Data
  • Calculated Data (Flight Path Angle, Roll and Pitch rates, Vertical Speed, and Yaw Data).
4
Q

(Navigation) What is the difference between “NORMAL” and “BOTH ON L” or “BOTH ON R” on the IRS Transfer Switch on the Overhead Panel?

A
  • NORMAL - All the data comes to the Pilot’s displays from the default (same side) IRU.
  • “BOTH ON L” or “ BOTH ON R” - All the data comes to the Pilot’s displays from the Left IRU or the Right IRU respectively.
5
Q

(Navigation) What powers the Inertial Reference Units (IRU’s)?

A

Each IRU has two power sources (one 115 V AC and the other 28 V DC - either is sufficient, but in most cases 28 V DC is a back-up source).

6
Q

(Navigation) What normally powers the L IRU?

A

AC Standby Bus

7
Q

(Navigation) What normally powers the R IRU?

A

AC Transfer Bus 2

8
Q

(Navigation) If AC power is lost or not normal, what power source will automatically take over for the IRU’s?

A

Switched Hot Battery Bus

9
Q

(Navigation) What does the ON DC light on the IRS MODE SELECTOR UNIT on the Overhead Panel indicate when illuminated?

A

The IRS is on Battery Power.

10
Q

(Navigation) What does an illuminated DC FAIL light on the IRS MODE SELECTOR UNIT on the Overhead Panel indicate?

A

The respective DC Power is not normal.

11
Q

(Navigation) You just turned each IRU to OFF using the switch on the IRS MODE SELECTOR UNIT on the Overhead Panel - the IRU stays powered for approximately 30 seconds, how do you know the system is shutdown?

A

The ALIGN light will remain illuminated until the system completely shuts down.

12
Q

(Navigation) How is a normal alignment of the IRU’s accomplished?

A

By rotating the IRS Mode Selector switch from OFF to NAV on the IRS MODE SELECTOR UNIT panel on the Overhead Panel.

13
Q

(Navigation) What indicates that the IRU’s have begun the alignment process?

A

ON DC light will illuminate for approximately 2 seconds then extinguish and the ALIGN light illuminates.

14
Q

(Navigation) What does a flashing ALIGN light on the IRS MODE SELECTOR UNIT on the Overhead Panel indicate?

A
  • No present position has been entered

* The entered position is unreasonable and does not pass the internal position comparison test.

15
Q

(Navigation) How is a fast alignment (on a through flight) of the IRU’s accomplished?

A

Move the switches on the IRS MODE SELECTOR UNIT on the Overhead Panel to ALIGN, within 30 seconds enter the ICAO Code and Gate Number - when the coordinates are input in the MCDU move the switches back to NAV.

16
Q

(Navigation) What would an illuminated FAULT light and a Flashing ALIGN light on the IRS on the IRS MODE SELECTOR UNIT on the Overhead Panel indicate?

A

That the aircraft moved during the alignment.

17
Q

(Navigation) What is the purpose of the ATT switch position on the IRS MODE SELECTOR UNIT panel on the Overhead Panel?

A

If IRS alignment is lost while airborne, both present position and ground speed outputs are unreliable, the ATT can re-level the system and provide an attitude reference.

18
Q

(Navigation) What would an illuminated FAULT light on the IRS on the IRS MODE SELECTOR UNIT on the Overhead Panel indicate?

A

That the IRS has detected a system Fault.