737 Flight Crew Operations Manual
Supplementary Procedures -
Flight Management, Navigation
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D6-27370-866-EGP SP.11.3
Set IRS position .......................................... Enter present position
Enter present position. If ALIGN light flashes, re-enter same
present position over displayed position.
Note: Approximately five to seventeen minutes are required for
alignment.
If ALIGN light continues to flash, maintenance action is required.
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.
Inadvertent Selection of Attitude Mode (while on the ground)
Inadvertent selection of the attitude mode may be due to physically
overpowering the switch during turn–on or may be the result of a faulty
switch which prevents the flight crew from accurately determining which
mode is selected.
If ATT position is selected inadvertently when switching to NAV
IRS mode selectors ................................................................. OFF
Observe ALIGN lights extinguish.
After ALIGN lights extinguish, initiate a full alignment.
September 24, 2015
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