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What does #1 mean if the light is steady?
Steady – the related IRS is operating in the ALIGN mode, the initial ATT mode, or the shutdown cycle
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What does #1 mean if the light is flashing?
flashing – alignment cannot be completed due to IRS detection of:
-significant difference between previous and entered positions or an unreasonable present position entry
-no present position entry.
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Illuminated (amber) – a system fault affecting the related IRS ATT and/or NAV modes has been detected.
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Illuminated (amber) –
-the related IRS is operating on DC power from the switched hot battery bus (AC power not normal)
-if on the ground, the ground–call horn in the nose wheel well sounds, providing an alert that a battery drain condition exists
-momentary illumination is normal during alignment self–test.
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Illuminated (amber) –
-DC power for the related IRS is not normal
-if the other lights are extinguished, the IRS is operating normally on AC power.
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What does an illuminated GPS light mean?
Illuminated (amber) –
-indicates failure of both GPS sensor units
-indicates failure of a single GPS sensor unit when either system annunciator panel is pushed to initiate a recall
-with single GPS sensor failure, light extinguishes when the system recall is reset.
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Does an extinguished ALIGN light mean that the system is NAV and aligned?
Not necessarily.
-IRS not in ALIGN mode
-with mode selector in NAV, alignment is complete, and all IRS information is available
-with mode selector in ATT, attitude information is available. Heading information is available following entry of initial magnetic heading.
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If the latitude/longitude position is not within ___of the origin airport, the CDU scratchpad message VERIFY POSITION is displayed. If the entered latitude/longitude position does not pass the IRS internal comparison tests, the scratchpad message ENTER IRS POSITION is displayed.
4 NM
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Are the IRSs the only source of attitude and heading information?
No, the Standby instrument and compass are available
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If the airplane’s present position cannot be entered through the MCDU, how can it be entered?
IRS display unit
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How long should IRS alignment normally take?
5 to 17 minutes
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Where can you see how much time is remaining in the alignment process?
Inertial System Display Unit (ISDU) HDG/STATUS POS
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What are the normal and standby power sources for the left IRS?
AC standby bus normally, backup is switched hot battery bus
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What are the normal and standby power sources for the right IRS?
AC transfer bus 2 normally, backup is switched hot battery bus for 5 minutes
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If the IRS does not like the airplane position entered, what message will be displayed?
VERIFY POSITION
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How long should a fast alignment take?
30 seconds
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What happens if the airplane is moved during a fast alignment?
IRS automatically begins a full alignment when the aircraft stops moving
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If IRS alignment is lost during flight, can it be regained?
No
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What are the IRSs good for if alignment is lost in flight?
Attitude reference
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How long should it take to re-establish attitude reference if it is lost in flight?
30 seconds of straight and level flight
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What must be done to re-establish heading reference if lost in flight?
Enter actual heading
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What should the crew be concerned with when using IRS heading reference?
Updating it from time to time
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What alert would you get if an IRS was left ON and the battery was the only source of power?
Horn in nosewheel well
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If an IRS was to fail, could the affected pilot benefit from the operating IRS?
Yes, use the IRS transfer switch
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Which IRS is the default IRS?
Left for left, right for right
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If the aircraft reverted to standby power, what lights would be illuminated on the IRS panel?
ON DC on the right, no lights on the left
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How long will the ON DC light remain illuminated on the right?
5 minutes, then it will shutdown
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What is the procedure for a fast realignment?
Prior to commencing procedure the airplane must be parked and not moved until procedure is complete and ALIGN lights extinguish.
IRS mode selectors ..........ALIGN
Observe ALIGN lights illuminate steadily.
CDU ...............................Set
Enter present position on SET IRS POS line of the POS INIT page.
IRS mode selector ..................NAV
Observe ALIGN light extinguished within 30 seconds.
Note: If time permits it is preferable to perform a full alignment of the IRS. A more precise alignment will result.
Note: If the mode selector is accidentally switched to OFF or ATT, position mode selector to OFF, wait for ALIGN light(s) to extinguish, then perform full alignment procedure.
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