(b)
Set mode selector switch on appropriate MSU to STBY.
(c)
On IB 406-409, place the control display unit data selector to POS, check that: 1) Red, amber and green lamps do not illuminate. 2) Left-hand data display is all zeros and an N. 3) FROM/TO display is 0 0. 4) Program number 72 28 is displayed in the right-hand data
display and the INSERT pushbutton illuminates. For the complete program number 0 is displayed in the right-hand display when the HOLD pushbutton is pressed.
(d)
On IB 410-499, place the control display unit data selector to POS, check that: 1) Red, amber and green lamps do not illuminate. 2) FROM/TO display is 0 0. 3) INSERT pushbutton illuminates. 4) Program number 72-50-01 is displayed as 72 in left display
and 50 01 in right display.
(e)
Set the control display unit WPT switch to any position except
0.
EFFECTIVITY
ALL 11 Page 502 Apr 25/8634-41-03
SEE A
A
A
CIRCUIT
BREAKER
BATTERY
CELL
(TYPICAL)
A
FRONT CIRCUIT BREAKER
PULLED
NOTE POLARITY A 0-3A AMMETER
OF HOOKUP 0 3
BATTERY UNIT
(COVER RAISED)
A-A
Navigation Unit Battery Charger Test
Figure 501
767205
EFFECTIVITY
ALL 701 Page 503
34-41-03
Oct 10/73
(f) Set CDU data selector switch to TEST. Check that: 1) ALERT, BATT, and WARN lamps on CDU illuminate. 2) Numerals 88.88.8 N/S are displayed in left-hand data
display. 3) Numerals R88.88.8 E/W are displayed in right-hand data display.
NOTE: The symbols N S and E W are superimposed one on
____ the other.
4) Numerals 8 8 are displayed in FROM-TO display.
(2) If INS is no longer required, restore airplane to normal.
G. Test LITTON Inertial Navigation Unit (AIRPLANES WITH LTN-72RL INS)
(1)
Data Base Validity
(a)
Place mode selector switch on MSU to STBY. Verify the following on CDU display: 1) Title of data base (geographical zone) is on top line. 2) Program 72-73-00 is on second line. 3) Prompt/display line between the entry line markers contains
dashes for entry of present day, month, and year.
(b)
Enter todays date by pressing CDU pushbuttons corresponding to digits for day, month and year, in that sequence.
(c)
Press ENT pushbutton on the CDU. Verify that CDU display changes to show DATA BASE VALID between entry line markers.
(2)
Annunciator and Display Tests
(a)
Place mode selector switch on each MSU to STBY.
(b)
Press BRT and DIM pushbuttons on each CDU and verify that display brightens and dims.
(c)
Press STS pushbutton on each CDU, SYS STS/TEST page will appear on each CDU display with ALIGN between entry line markers.
(d)
Slew each CDU display up until SYSTEM TEST page appears (on each display) with DISPLAY TEST between entry line markers. Press EXP on each CDU and verify that: 1) Display pattern rotates through each of the five lines, on
each CDU display.
2) On each CDU, the WRN, BAT, ALR, and OFS annunciators come
on.
3) The ALERT annunciator (on each HSI) comes on.
4) The INS updating annunciators (on pilot's main instrument
panels) display green.
(e)
On each MSU, press READY NAV and BATT annunciators; verify that READY NAV annunciator comes on green and BATT annunciator comes on red.
(f)
To end test; press STS or EXP pushbutton on each CDU.
(3) If INS is no longer required, restore airplane to normal.
H. Test LITTON Inertial Navigation Unit (AIRPLANES WITH LTN-92 INS)
(1) Data Base Validity
(a)
Top line displays PGM 92-04-10.
(b)
CUSTOM DBASE is displayed between entry line markers.
EFFECTIVITY
ALL 05 Page 504 Apr 25/9134-41-03
(c)
The fourth line displays the airline code and data base expiration date: SNXXXX.
(d)
The fifth line displays CLR: CONTINUE
(e)
Enter current date by pressing CDU pushbuttons corresponding to day, month, and year in that sequence.
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