(7)  
Provide electrical power (Ref 24-22-00).

 (8)  
Check for proper operation of pilots' panel illumination, indicator lamps and annunciator lights using master test and dim control (Ref 33-11-00).

 (9)  
Provide cooling air to electronic equipment (Ref 21-58-00).

 CAUTION: ENSURE EQUIPMENT COOLING IS OPERATED BEFORE TURN ON OF
_______ ELECTRONIC SYSTEMS OR DAMAGE TO EQUIPMENT MAY RESULT. EQUIPMENT COOLING SYSTEM MUST BE SET FOR NORMAL COOLING AS DESCRIBED IN 21-58-00.
 EFFECTIVITY

 AIRPLANES WITH LTN-72RL OR  CONFIG LTN-92 INS  01 Page 501  Apr 25/91

34-41-00
 (10) Provide cooling air to INS equipment (Ref 21-58-00).
 CAUTION: ENSURE THAT COOLING AIR IS AVAILABLE TO NAVIGATION UNITS
_______ BEFORE OPERATING INS. FAILURE TO PROVIDE ADEQUATE AIR SUPPLY WILL RESULT IN FAILURE OF NAVIGATION UNITS.
 (11) Ensure that the following circuit breakers are closed on electronic circuit breaker panels P7 and P126.
 (a)  
INS (ALL)

 (b)  
VOR/ILS (ALL)

 (c)  
DME (ALL)

 (d)  
MHRS (ALL)

 (e)  
CADS (ALL)

 (f)  
HSI (ALL)

 (g)  
ADI (ALL)

 E. Data Base Validity
 (1)  
On airplanes with LTN-72RL INS, place mode selector switch on each MSU to STBY. Verify the following on each CDU display:

 (a)  
Title of data base (geographical zones for example USA & CANADA, or MEDITERRANEAN) is on top line.

 (b)  
Program 72-73-00 is on second line.

 (c)  
Prompt/display line between the entry line markers contains dashes for entry of present day, month, and year.

 (d)  
Enter todays date by pressing CDU pushbuttons corresponding to digits for day, month and year, in that sequence.

 (e)  
Press ENT pushbutton on the CDU. Verify that CDU display changes to show DATA BASE VALID between entry line markers.

 (2)  
On airplanes with LTN-92 INS, place mode selector switch on each MSU to STBY. After 6 seconds, verify the following on each CDU display:

 (a)  
Top line displays PGM 92-04-10.

 (b)  
CUSTOM DBASE is displayed between entry line markers.

 (c)  
The fourth line displays the airline code and data base expiration date: SNXXXX.

 (d)  
The fifth line displays CLR: CONTINUE

 (e)  
The ALIGN annunciator on MSU illuminates amber in color.

 F. Annunciator and Display Tests.
 (1)  
Place mode selector switch on each MSU to STBY.

 (2)  
Press BRT and DIM pushbuttons on each CDU and verify that display brightens and dims.

 NOTE: BRT and DIM functions are operable only in the numeric
____
 mode.

 (3)  
Press STS pushbutton on each CDU. Verify that SYS STS/TEST page appears on each CDU display with ALIGN between entry line markers.

 (4)  
Slew each CDU display up until SYSTEM TEST page appears (on each display) with DISPLAY TEST between entry line markers.

 (5)  
Press EXP on INS-1 CDU and verify that:

 EFFECTIVITY
 AIRPLANES WITH LTN-72RL OR  CONFIG LTN-92 INS  01 Page 502  Apr 25/91

34-41-00
 (a)  
Display pattern rotates through each of the five lines on INS-1 CDU display.

 (b)  
On INS-1 CDU, the WRN, BAT, ALR, and OFS annunciators come on.

 (c)  
ALERT annunciator illuminates on captain's HSI.

 (6)  
Repeat step (5), substituting INS-2 for INS-1 and first officer's HSI for captain's HSI.

 (7)  
Repeat steps (5) thru (5)(b), substituting INS-3 for INS-1.

 (8)  
On airplanes with LTN-72RL INS, on each MSU, press READY NAV and BATT annunciators. Verify that READY NAV annunciator comes on green and BATT annunciator comes on red. On airplanes with LTN-92 INS, on each MSU, press ALIGN and BATT annunciators. Verify that ALIGN annunciator comes on amber and BATT annunciator comes on red.

 (9)  
To end test, press STS or EXP pushbutton on each CDU.

 G. Present Position Entry
 (1)  Airplane present position must be entered into INS before platform alignment can be completed.
 NOTE: On airplanes with LTN-72RL INS,
____ if unreasonable entries of latitude or longitude are attempted (for example latitude entry greater than 90 degrees) the latitude or longitude line on the CDU display will flash.
　
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