(2)
Malfunction code 54 is set when the INS is under PMS waypoint control, and a control word is not received from the PMS; or if a flight leg is commanded by the PMS, but a FROM/TO waypoint is not received from the PMS. When this malfunction code is set the INS automatically reverts to INS waypoint control.
NOTE: If malfunction code 54 occurs at a ground speed greater than
____ 75 knots, the INS cannot be returned to PMS waypoint control (PMS lockout), until the INS is down moded to STBY, or turned OFF and then turned on.
If malfunction code 54 occurs at ground speeds less than 75 knots the INS can be returned to PMS waypoint control without down moding the INS.
(3) Malfunction code 55 is set when the INS automatically reverts to INS waypoint control, and a TO waypoint is not found in the INS to match the TO waypoint being flown.
C. Semipermanent Malfunction Record Display
(1) Codes for all malfunctions and out-of-tolerance conditions detected by the DCU are semipermanently recorded for display as they occur. The DCU erases this record and starts a new record each time fine alignment (PI=6) is started. The following steps describe the procedure for interrogating the DCU to display codes for all malfunctions, including intermittent out-of-tolerance conditions, which have been detected by the DCU since the last time fine alignment was started.
CAUTION: THE MSU MODE SELECT SWITCH SHOULD BE IN STBY WHEN
_______ DISPLAYING THE SEMIPERMANENT MALFUNCTION RECORD; OTHERWISE, FINE ALIGNMENT OF THE SYSTEM WILL TAKE PLACE AND ERASE THE MEMORY.
(a)
Place data selector switch in DSRTK/STS position. Observe actual performance index number and desired performance index number in right-hand data display.
(b)
Simultaneously press and hold TEST switch and HOLD key. Observe all eights in data displays and FROM-TO display and all lamps and keys lighted.
(c)
Release TEST switch and HOLD key. Observe that malfunction code (12 through 63) appears in right-hand data display.
EFFECTIVITY
AIRPLANES WITH DELCO INS CONFIG 1 02 A Page 106 Apr 25/8634-41-00
(d) Press and release TEST switch in sequence and record all malfunction codes until malfunction code display goes blank or reverts to an action code display (01 through 06). Refer to figure 101 for recommended action.
NOTE: The semipermanent malfunction record display can be
____ repeated by rotating the DSS out of the DSRTK/STS position, then back into DSRTK/STS and repeating steps
(b) through (d).
(e) If entry to the malfunction code analysis procedure was from a flight squawk, perform an operational test. If entry was from the trouble tree, repeat the step at which the malfunction occurred and complete the remaining steps on the trouble tree.
EFFECTIVITY
AIRPLANES WITH DELCO INS CONFIG 1 02 A Page 107 Apr 25/8634-41-00
ALIGN MODE NUMBER
9 STBY MODE
8 COARSE LEVEL - PLATFORM ALIGNS TO LOCAL HORIZONTAL
7 FINE ALIGN - ESTABLISHES RELATIONSHIP BETWEEN INS PLATFORM AND TRUE NORTH
6 FINE ALIGN - PRESENT POSITION MUST BE LOADED TO ENTER MODE 6. INS COMPARES LOADED PRESENT POSITION WITH INERTIAL POSITION. INS USES THE COMPARISON TO UPDATE SELF CALIBRATION DATA
5 ADEQUATE ALIGNMENT - SET MSU TO NAV TO ENTER NAV MODE
4REFINEMENT OF ALIGNMENT -
3
CONTINUING OPERATION OF 2 SELF CALIBRATION PROCESS1 BEGUN IN MODE 6 AND 50
DURING NAV MODE, FOR CIV 31N PROGRAM,CIVA-20 PROGRAM, CIVA-28A PROGRAM, AND 32C PROGRAM, ALIGN MODE NUMBER AUTOMAT-ICALLY SET AT 5. DURING NAV MODE, FOR CIVA-25, AND CIVA-28A-2 PROGRAMS, REFLECT NAVIGATION PERFORMANCE (ACCURACY
INDEX AI) AI VALUE
9
8
PURE INERTIAL7 PERFORMANCE
6
5
4
ENROUTE SUITABILITY
3
2 TERMINAL SUITABILITY
1 APPROACH SUITABILITY
OPERATING MODE NUMBER AUTOMATICALLY SET TO A DESIRED PERFORMANCE INDEX OF 5 DURING ALIGN, CANNOT BE CHANGED UNTIL THE INS ENTERS THE NAV MODE. IN NAV INDI-CATES OPERATING MODE, THE OPERATING MODE NUMBER MAY BE CHANGED BY
SELECTOR SWITCH PRESSING CDU NUMBERED KEY THEN INSERT KEY
5
3
INS OPERATING ON AIRPLANES WITH DELCO CIVA-28A-2 INS, INDEPENDENTLY2
AUTOMATICALLY SET TO A DESIRED PERFORMANCE
0
INDEX OF 5 DURING ALIGN, AUTOMATICALLY
CHANGES TO 4 WHEN THE INS ENTERS THE 4 AIDED INERTIAL MODE
NAV MODE. IN NAV INDICATES OPERATING MODE, USING DME DATA OR
THE OPERATING NUMBER MAY BE CHANGED BY TRIPLE INS MIXING
PRESSING CDU NUMBERED KEY THEN INSERT KEY
1 POSITION UPDATE ERADICATION (CHANGES TO 5 IMMEDIATELY AFTER INSERTION)
INS Status/Malfunction Code Display
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