IRS PARAMETERS USED BY INTERFACES
1 IRU NO. 1 ONLY
IRS Digital Output Interface Figure 17 (Sheet 2)
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A 737-300/400/500MAINTENANCE MANUAL
Position initialization by the FMCS-CDU is accomplished by accessing the POS INIT 1/2 page on the FMCS-CDU by one of four methods:
(a)
Pressing the INIT/REF mode select key (when on the ground and when the IRS position has not been initialized).
(b)
Pressing the POS line select key when the INDEX page is displayed.
(c)
Pressing the POS INIT line select key when the IDENT page is displayed.
(d)
Pressing the PREV PAGE or NEXT PAGE key when the POS REF 2/2
page is displayed.One of the following three methods is used to enter present position lat/long into the SET IRS POS line of the POS INIT page on the CDU.
(a)
LAT/LONG is entered into the scratch pad using the keyboard, then line selected into the SET IRS POS line.
(b)
LAT/LONG is transferred from the LAST POS line to the SET IRS POS line via the scratch pad.
(c)
REF AIRPORT or REF AIRPORT and GATE is entered, the resultant
lat/long is line selected to the SET IRS POS line.Position initialization on the ISDU is done for both IRU's simultaneously. Initialization at the ISDU is done as follows:
(a)
Set SYS DSPL switch to either IRU (L or R).
(b)
Set DSPL SEL in the PPOS position.
(c)
Enter the present position (latitude and longitude) by pressing in proper sequence, two of the following keys; N(2), W(4), E(6), or S(8) and the input position.
(d)
Press ENT key to transmit the data displayed to both IRU's.The alignment mode can be entered by turning the mode select switch in any of four sequences: OFF to ALIGN, OFF to ALIGN to NAV, NAV to ALIGN, or NAV to ALIGN to NAV.
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