S 862-008
(2)
Supply the electrical power (AMM 24-22-00/201).
S 862-018
(3)
Supply cool air to the EHSI's, EADI's and EFIS symbol generators (AMM 21-58-02/501).
S 862-013
(4)
Supply cool air to the inertial reference units (IRU) (AMM 21-58-03/501).
(5)
Do these steps to align the IRS from a CDU.
S 822-009
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú
34-28-01
ú ú 02 Page 202 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
CAUTION:_______SOME SWITCHES MUST BE PULLED AND THEN TURNED. IF YOU TRY TO TURN THESE SWITCHES BEFORE YOU PULL THEM, YOU CAN DAMAGE THEM.
(a) To do a high latitude alignment, set the switches on the IRS mode select unit (MSU) to the ALIGN position from the OFF position.
NOTE: You can find the MSU on the P5 overhead panel.
____ A high latitude alignment takes 17 minutes. Note the present time for later use in this procedure.
1) Make sure that the ON DC lights on the MSU come on for a short time. 2) Make sure that the ALIGN lights on the MSU come on.
(b) To do a regular alignment, set the switches on the IRS mode select unit (MSU) to the NAV position from the OFF position.
NOTE: You can find the MSU on the P5 overhead panel.
____
A regular alignment takes 10 minutes.
1) Make sure that the ON DC lights on the MSU come on for a short time. 2) Make sure that the ALIGN lights on the MSU come on.
(c)
Push the INIT REF key on the CDU.
(d)
Push the line select key adjacent to the <INDEX prompt. 1) Make sure that the CDU shows the INIT/REF INDEX page.
(e)
Push the line select key adjacent to the <POS prompt. 1) Make sure that the CDU shows the first POS INIT page.
(f)
Put the latitude and the longitude into the scratch pad line of the CDU.
(g)
Push the line select key adjacent to SET IRS POS.
1) Make sure that the CDU shows the latitude and the longitude below SET IRS POS.
(h)
If you did a regular alignment, make sure that the ALIGN lights on the MSU turn off.
NOTE: The IRS is now aligned and in the navigation mode.
____
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú
34-28-01
ú ú 01 Page 203 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
CAUTION:_______SOME SWITCHES MUST BE PULLED AND THEN TURNED. IF YOU TRY TO TURN THESE SWITCHES BEFORE YOU PULL THEM, YOU CAN DAMAGE THEM.
(i) If you did a high latitude alignment, after 17 minutes, set the switches on the MSU to the NAV position from the ALIGN position. 1) Make sure that the ALIGN lights on the MSU turn off.
NOTE: The IRS is now aligned and in the navigation mode.
____
S 822-010
(6) Do these steps to align the IRS from the ISDU.
CAUTION:_______SOME SWITCHES MUST BE PULLED AND THEN TURNED. IF YOU TRY TO TURN THESE SWITCHES BEFORE YOU PULL THEM, YOU CAN DAMAGE THEM.
(a) To do a high latitude alignment, set the switches on the IRS mode select unit (MSU) to the ALIGN position from the OFF position.
NOTE: You can find the MSU on the P5 overhead panel.
____ A high latitude alignment takes 17 minutes. Note the present time for later use in this procedure.
1) Make sure that the ON DC lights on the MSU come on for a short time. 2) Make sure that the ALIGN lights on the MSU come on.
(b) To do a regular alignment, set the switches on the IRS mode select unit (MSU) to the NAV position from the OFF position.
NOTE: You can find the MSU on the P5 overhead panel.
____ A regular alignment takes 10 minutes.
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