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Press INT or FLT transmitter selector (as installed). Select receiver
switch and adjust volume controls on the audio selector panel and
overhead speaker. Position microphone selector to MASKS.
Oxygen Panel..........................................................................................SET
Check that mask is properly stowed and Normal/100% switch is in the
100% position.
Reset / Test Slide Lever...................................PUSH DOWN AND HOLD
Observe momentary yellow cross in flow indicator.
Emergency / Test Selector.............................................PUSH AND HOLD
While holding reset / test slide lever down and pushing emergency /
test selector, simultaneously key microphone and listen for oxygen
flow sound through the overhead speaker. Then release all switches.
Position microphone selector to BOOM.
IRS Selectors .............................................................................................. NAV
System Startup:
IRS Mode Selector ............................................................................... NAV
Move IRS mode selector from OFF through ALIGN to NAV. Observe the
ON DC lights momentarily illuminate during self test. Observe the
white IRS ALIGN lights illuminate after ten seconds indicating start of
alignment. After ten minutes of successful alignment, the IRS
automatically enters NAV mode.
IDENT Page ....................................................................................SELECT
Verify that current NAV DATA is selected. If both primary and
alternate NAV DATA are out of date, operations may be continued
using conventional VOR / Airways navigation. Notify Dispatch that
the aircraft is no longer area navigation capable. Enter a discrepancy
in the maintenance log.
737 Sec. 3 Page 41
Flight Manual Continental Rev. 11/15/02 #41
Present Position ................................................................................ENTER
Ensure that IRS’s are in NAV and both ALIGN lights are illuminated.
Verify that SET IRS HDG prompt is not displayed.
Select POS INIT on a CDU; observe box prompts on line 4.
Enter the ICAO airport identifier into REF AIRPORT (2L).
Enter a gate identifier (example: C17), on the GATE (3L) line.
Note: Gate coordinates are not available for all airports.
>>@ Compare REF AIRPORT coordinates and GATE
coordinates (if available) to LAST POS to ensure accuracy. Line
select GATE (if available), or REF AIRPORT coordinate to the
scratchpad and transfer to SET IRS POS box prompts (4R).
BCD Line select either GPS position coordinates to the scratch
pad from POS REF (2/3). Return to POS INIT (1/3) and compare
scratchpad coordinates to GATE (if available), REF AIRPORT and
LAST POS coordinates to ensure accuracy. Enter GPS coordinates
into SET IRS POS box prompts (4R).
If GPS coordinates are not available, if available utilize GATE or REF
AIRPORT coordinates for alignment.
If an IRS does not accept the initialization latitude / longitude the FMC
message ENTER IRS POS will appear and one or both ALIGN lights will
flash. Recheck accuracy of the initialization coordinates before reentering.
Re-enter the correct initialization position into the scratchpad
and line select SET IRS POS (4R).
To Enter Present Position Direct To IRS:
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.
Sec. 3 Page 42 737
Rev. 11/15/02 #41 Continental Flight Manual
Fast Re-Alignment - Ground:
A fast re-alignment (30 seconds) zeros the ground speed, but does not
correct heading errors. While this method may be required in certain
circumstances, the full ten minute alignment is the preferred method.
Mode Selectors...........................................................................ALIGN
Ensure that both white ALIGN lights illuminate.
Present Position.........................................................................ENTER
Insert present position in CDU box prompts as described under system
startup.
Mode Selectors.............................................................................. NAV
BCD GPS Light (Flow).............................................. EXTINGUISHED
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