(8)  
Press CDU STS pushbutton; CDU display will change to SYS STS/TEST page.

 D.  Record action and malfunction codes and perform the action recommended by the action code.
 5.  Radio Update Advisory Codes (AIRPLANES WITH LTN-92 INS)
___________________________
 A.  When the INS position is being updated by VOR/DME navigation signals (update enabled), the INS applies validity or reasonableness tests to the signals. If these tests fail, the CDU displays an advisory message on line 5 of the display.
 6.  Radio Update Advisory Codes (Fig. 102) (AIRPLANES WITH LTN-72RL INS)
___________________________
 A.  When the INS position is being updated by VOR and DME radio navigation signals, (update enabled), the INS applies validity or reasonableness tests to the signals. If these tests fail the CDU displays an advisory code on line 5 of the UDT:ENABLED page. If more than one test fails, the codes cycle periodically. Slewing the code between the CDU entry line markers, and pressing the EXP pushbutton, causes a brief explanation of the codes to be displayed.
 EFFECTIVITY

 AIRPLANES WITH LTN-72RL OR  CONFIG LTN-92 INS  01 Page 103  Apr 25/91

34-41-00
 CODE ACTION  RECOMMENDED ACTION CODE MALF  SYSTEM MALFUNCTION  WARN MASTER  30 AND 31 (F) STATUS, BITS DIGITAL WORD, AUTOLAND 
1  REMOVE INU MAINTENANCE REQUIRED  21 20 18 17(A) 17(A) 16(A) 16(A) 17(A) 15(A) 15(A) 10 09 12 11  Vy = Vx = Vx = Vx = >0.05g (AT BEGINNING OF NAV MODE) >1.8g OVER 4 SECONDS 0 OVER 5 MINUTES TAKEOFF VERT QUANTIZER PULSE TEST >5.75g OVER 4 SECONDS >5.75g OVER 4 SECONDS 0 OVER 5 MINUTES . Vx = . Vy = EE ROM #2 FAIL GROUND SPEED UNREASONABLE EE ROM #2 FAILRAM TEST FAIL ARITHMETIC ERRORCHECKSUM ERROR-UVEROM 551 CHECKSUM ERROR-UVEROM 550  (D) STEADY ON  (G) STATUS BITS 
1  REQUIRED REMOVE CDU MAINTENANCE  13  CHECKSUM ERROR FROM CDU  OFF  APPLICABLE NOT 
2 (B)  POSITION RE-ENTER PRESENT OFF-ON SEQUENCE AND CYCLE SYSTEM THROUGH  22 23 26 24 LEVEL AXIS VELOCITY EXCESSIVE PLATFORM NOT READY LEVEL AXIS BIAS ERROR COARSE ALPHA FAIL  FLASHES  APPLICABLE NOT 
3 (B) ENTER PRESENT POSITON SWITCH TO STBY AND  25  ALIGN MODE PRESENT POSITION NOT ENTERED PRIOR TO  FLASHES  APPLICABLE NOT 
4  CHECK 26V 400-Hz MALF 08 MALF 07, VERT DEV CHECK XTK DEV (DC) TO 06 BREAKERS - MALF 02 EXCITATION CIRCUIT 08 07 06 05 04 03  VERTICAL DEV (DC) CHANNEL FAIL CROSS TRACK DEV (DC) CHANNEL FAIL AUTOPILOT STR CHANNEL FAIL DRIFT ANGLE/BRG CHANNEL FAIL COURSE POINTER CHANNEL FAIL HDG CHANNEL FAIL  OFF (C)  APPLICABLE NOT 
4  400-Hz CKT BRKRS CHECK ASSOCIATED 26V, STEERING AND AUTOLAND; DO NOT USE INS FOR  02 PLATFORM HDG CHANNEL TEST FAIL  OFF (C)  (H) STATUS BITS 

EFFECTIVITY

LTN-72RL PROGRAM 72-73-00
INS Action and Malfunction Codes
Figure 101 (Sheet 1)

EFFECTIVITYCONFIG 3 AIRPLANES WITH LTN-72RL INS
799 Page 104
 Apr 25/86
34-41-00
 CODE ACTION  RECOMMENDED ACTION CODE MALF  SYSTEM MALFUNCTION  WARN MASTER  30 AND 31 (F) STATUS, BITS DIGITAL WORD, AUTOLAND 
5  REQUIRED REMOVE CDU MAINTENANCE  14 CDU COOLING FAN FAIL  OFF  APPLICABLE NOT 
6 (B)  HEATER CIRCUIT BREAKER CHECK INS 115V, 400 Hz  27 TURE WITHIN 5 MINUTES FROM TURNON PLATFORM NOT UP TO OPERATING TEMPERA- FLASHES  APPLICABLE NOT 
7 (B)  CONNECTOR ATTITUDE SLEW TEST CHECK FOR REMOVAL OF  01  ATTITUDE SLEW TEST CONNECTOR IN PLACE  FLASHES  APPLICABLE NOT
 8  WITH OTHER SYSTEM(S) CHECK SYSTEM ACCURACY  01  50 KNOTS OR GROUND SPEED DIFFERS BY MORE THAN POSITION DIFFERS BY MORE THAN 35 MILES FAILED INTERSYSTEM COMPARISON TEST.  OFF (E)  (G) STATUS BIT 

(A)  
WILL OCCUR IN NAV MODE ONLY

(B)  
WILL OCCUR IN ALIGN MODE ONLY

(C)  
HSI NAV FLAGS WILL BE IN VIEW

(D)  
WARN MAY BE EXTINGUISHED BY PRESSING CLR PUSHBUTTON WHEN ACTION CODE IS ON CDU LINE 3

(E)  
COMPARISON WARN MESSAGE IS DISPLAYED ON CDU.

(F)  
AUTOLAND DIGITAL WORD, STATUS BITS 30 AND 31 ARE 0 AND 1 RESPECTIVELY FOR FAIL CONDITION.

(G)  
AUTOLAND DIGITAL WORD, STATUS BITS 30 AND 31 REMAIN AT 0 AND 1 RESPECTIVELY; UNTIL INS IS CYCLED THROUGH OFF-ON SEQUENCE.

(H)  
AUTOLAND DIGITAL WORD, STATUS BITS 30 AND 31 REMAIN AT 0 AND 1 RESPECTIVELY; WHILE MALFUNCTION PERSISTS.

EFFECTIVITY

LTN-72RL PROGRAM 72-73-00
INS Action and Malfunction Codes
Figure 101 (Sheet 2)

EFFECTIVITYCONFIG 3 AIRPLANES WITH LTN-72RL INS
799 Page 105
　
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