Weather Radar Test
EFIS mode selector...............................MAP, MAP CTR, VOR, or APP Weather Radar Mode ..................................................................... TEST YA721 - YA803 STAB ..................................................................................................ON
Copyright . The Boeing Company. See title page for details.
Supplementary Procedures -Flight Management, Navigation
737 Flight Crew Operations Manual
WXR (EFIS control panel)................................................................. ON Verify test pattern consisting of the following colors appears:
.
Green
.
Yellow
.
Red
.
Magenta.
If testing of the PWS system is desired: Weather Radar Mode ..................................................Deselect TEST WXR (EFIS control panel) ........................................................... ON Weather Radar Mode .................................................................TEST
Verify the amber WINDSHEAR caution, red WINDSHEAR warning and PWS FAIL annunciations display momentarily and then extinguish.
Note: In the short time the weather radar is on and not in the
TEST position, it will radiate.
IRS Align Light(s) Flashing
Do not move IRS Mode selector to OFF except where called for in procedure.
POS INIT page ............................................................................... Select Set IRS position .................................................... Enter present position Enter present position using the most accurate latitude and longitude available. If the present position is being entered via the CDU and a position is already displayed on the SET IRS POS line, enter new position over displayed position. If ALIGN light continues to flash: Set IRS position ............................................... Enter present position Re-enter same present position. If ALIGN light continues to flash after re-entry: IRS ...............................................................................................OFF
Copyright . The Boeing Company. See title page for details.
Supplementary Procedures -Flight Management, Navigation 737 Flight Crew Operations Manual
Rotate IRS Mode Selector to OFF and verify ALIGN light extinguished. Note: Light must be extinguished before continuing with procedure (approximately 30 seconds.)
IRS ...............................................................................................NAV Rotate IRS Mode Selector to NAV and verify ALIGN light illuminated.
Set IRS position .......................................................................... Enter 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.
Copyright . The Boeing Company. See title page for details.
Supplementary Procedures -Flight Management, Navigation 737 Flight Crew Operations Manual
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.
IRS Entries Present Position Entry
IRS mode selector ............................................................................ NAV ALIGN lights must be illuminated (steady or flashing).
IRS display selector ........................................................................PPOS Latitude ............................................................................................Enter Key–in latitude in the data display, beginning with N or S, then press the ENT Key (the Cue Lights extinguish). Longitude .........................................................................................Enter Key–in longitude in the data display, beginning with E or W, then press the ENT key (the cue lights extinguish). Observe that proper latitude and longitude are displayed and that the ALIGN light is not flashing.
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