34-41-00
ACTION CODESTATUS
PRESS HOLD PUSHBUTTON TO CYCLE MALFUNCTION CODE
INS Action and Malfunction Codes Figure 101 (Sheet 1)
EFFECTIVITY
AIRPLANES WITH LTN-72 INS
CONFIG 01 A Page 106 Aug 25/87
34-41-00
(A)
WILL OCCUR IN NAV MODE ONLY (F) LEFT AND RIGHT DISPLAYS FLASH. FLASHING MAY BE ELIMINATED BY SETTING DISPLAY SELECTOR SWITCH TO
(B)
WILL OCCUR IN ALIGN MODE ONLY
DSR TK/STS AND PRESSING CLEAR KEY.
(C)
HSI WARN TO FLIGHT DIRECTOR AND AUTOPILOT
(G) FROM AND TO DISPLAYS WILL ALTERNATELY FLASH
(D)
WILL OCCUR AT STATUS 02 ONLY
UNTIL VALID TRACK LEG IS ENTERED.
(E)WARN MAY BE EXTINGUISHED BY SETTING DISPLAY (H) ONLY UNDER PMS CONTROL SELECTOR SWITCH TO DSR TK/STS AND DEPRESSING CLEAR KEY.
IB 406-409
IB 410-499
(72-28-0,72-50-01,72-50-02,72-50-03 PROGRAMS)
INS Action and Malfunction Codes
Figure 101 (Sheet 2)
EFFECTIVITY
AIRPLANES WITH LTN-72 INS
CONFIG 01 A Page 107 Aug 25/87
34-41-00
ACTION CODE RECOMMENDED ACTION MALF CODE SYSTEM MALFUNCTION MASTER WARN
1 REMOVE SYSTEM, MAINTENANCE REQUIRED 11 17 18 14 . Vy = ARITHMETIC ERROR 0 FOR 5 MINUTES OR . Vx = PROGRAM SUM CHECK FAILURE 0 FOR 5 MINUTES GS EXCESSIVE ON STEADY (D)
2 (B) CYCLE SYSTEM THROUGH OFF-ON SEQUENCE. RE-ENTER PRESENT POSITION 12 19 20 21 23 LEVEL AXIS BIAS UPDATE EXCESSIVE PLATFORM NOT READY WITHIN 1 MINUTE AFTER UP TO TEMP VERTICAL CHANNEL SELF-TEST FAIL LEVEL AXIS VELOCITY EXCESSIVE COARSE ALPHA COMPUTATION FAIL FLASHES
3 (B) CYCLE SYSTEM BACK TO STBY. RE-ENTER PRESENT POSITION 22 PRESENT POSITION NOT ENTERED AND MSU IN ALIGN OR NAV FLASHES
4 (C) DO NOT USE INS FOR HSI OR STEERING, CHECK ALL ASSOCIATED 26V, 400 HZ CIRCUIT BREAKERS 04 05 06 07 08 10 DIG/SYNC CH4 LOOP TEST FAIL (DRIFT ANGLE) DIG/SYNC CH2 LOOP TEST FAIL (HDG/STEERING) DIG/SYNC CH1 LOOP TEST FAIL (TKE/STEERING) DIG/DC LOOP TEST FAIL (XTK) DIG/SYNC CH3 LOOP TEST FAIL (TK/TKE+DA) LOSS OF PLATFORM SYNCHRO EXCITATION. ALSO BLANKS HDG, DA, AND WIND DISPLAYS OFF
6 (A) TURN OFF, CHECK INS CIRCUIT BREAKERS AND RESTART 24 PLATFORM NOT UP TO TEMP IN 5 MINUTES FROM TURN ON FLASHES
7 CHECK FOR REMOVAL OF ATTITUDE SLEW TEST CONNECTOR 02 ATTITUDE SLEW CONNECTOR IN PLACE FLASHES
8 (A) DO NOT USE INS FOR HSI OR STEERING 01 FAILED INTERSYSTEM COMPARISON OFF (E)
9 (A) INSERT TK LEG 16 INS IN NAV AND TK LEG NOT ENTERED OFF
(A)
WILL OCCUR IN NAV MODE ONLY
(B)
WILL OCCUR IN ALIGN MODE ONLY
(C)
HSI WARN TO FLIGHT DIRECTOR AND AUTOPILOT
(D)
WARN MAY BE EXTINGUISHED BY SETTING DISPLAY SELECTOR SWITCH TO DTK/STS AND DEPRESSING CLEAR KEY.
(E)
LEFT AND RIGHT DISPLAYS FLASH. FLASHING MAY BE ELIMINATED BY SETTING DISPLAY SELECTOR SWITCH TO DTK/STS AND PRESSING CLEAR KEY.
(72-50-04 PROGRAM)
INS Action and Malfunction Codes Figure 101 (Sheet 3)
EFFECTIVITY
AIRPLANES WITH LTN-72 INS
CONFIG 01 A Page 108 Aug 25/87
34-41-00
Place MSU mode selector in STBY. Place the CDU data selector to DSR TK/STS and the AUTO/MAN/RMT switch to MAN. Note turn on time and check that:
(1)
WARN lamp remains out
(2)
Left, right and FROM/TO displays illuminate
(3)
FROM/TO display shows 00
(4)
CDU right-hand data display shows status 90 IF -
AIRPLANES WITH LTN-72 INS
CONFIG 01 A Page 109 Aug 25/87
34-41-00
OK
EFFECTIVITY AIRPLANES WITH LTN-72 INS
CONFIG 01 A Page 110 Aug 25/87
34-41-00
OK
Set data selector switch to TEST position. Verify that mode selector switch is in ALIGN position. Set AUTO/MAN/RMT switch to each of its three positions - Check HSI and CDU displays are as follows:
(1)
Left and right numerical displays are degree signs, decimal points, arc-minute signs, NS, EW, and all eights, except left digit of right numerical display is R. From/To display is all eights and ALERT, BATT, and WARN annun-ciators and TK CHG, INSERT, and HOLD indicators are on.
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