IRS Alignment-Warning, Restoration Procedure
Figure 101

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A 737-300/400/500MAINTENANCE MANUAL
STATUS(OVERHEAD PANEL)MODE SELECTOR UNITALIGN ANNUNCIATOR FAULT LIGHTSTATUS---(AFTER 10 MINUTES)FLASHING  IRS(INDICATED ON ISDU,MALFUNCTION CODESOVERHEAD PANEL)NONE SIGNIFICANCE OF ALIGN ANNUNCIATORAND MALFUNCTION CODESFAILED ALIGN REQUIREMENT. RECOMMENDED ACTION ISDU OR THE FMC CDU.____NOTE: TRANSMIT THE PRESENT POSITION TO THE IRSVERIFY AND THEN RE-ENTER A KNOWN ACCURATE PRESENT POSITION, USING THESET IRS POSITION LINE. THEN LINE SELECT KEY (LSK) 4R TOWHETHER A PREVIOUS POSITION OR BOX PROMPTS ARE DISPLAYED ON THEPOSITION MUST BE RELOADED INTO THE CDU SCRATCH PAD REGARDLESS OFTO RE-ENTER PRESENT POSITION USING THE FMC CDU, THE PRESENT
---ON  NONE  LASER INTENSITY DEGRADATION  IRU IS STILL OPERABLE.REPLACE THE IRU; OR, IF IRU MAINTENANCE CAPABILITY IS NOT AVAILABLE,DEFER MAINTENANCE UNTIL A REPLACEMENT OF THE IRU IS AVAILABLE, SINCE THE
------ 01  ISDU FAILED TO PASS A POWER UP RAM TEST OR PROM SUMCHECK TEST . REPLACE ISDU.
STEADYON  02 BUT ENTERED LATITUDE DISAGREES WITH LATITUDE CALCULATED BY IRU.FAILED ALIGN REQUIREMENT. PRESENT POSITION HAS BEEN ENTERED TWICE, CODE 02 PERSISTS, REPLACE IRU.SECONDS). RESTART THE 10-MINUTE ALIGNMENT PROCEDURE. IF MALFUNCTIONMODE SELECTOR TO OFF. WAIT UNTIL ALIGN LIGHT GOES OUT (APPROXIMATELY 30REQUIRED, USING IDENTICAL ENTRIES). IF FAULT LIGHT PERSISTS, PLACEVERIFY AND THEN RE-ENTER A KNOWN ACCURATE PRESENT POSITION (TWICE, IF
ON--- 02  IRU FAILURE.  REPLACE IRU.
 ---FLASHING  03 EXCESSIVE MOTION OF AIRPLANE DURING THE ALIGNMENT PERIOD. PROCEDURE.GOES OUT (APPROXIMATELY 30 SECONDS). RESTART THE 10-MINUTE ALIGNMENTPLACE MODE SELECTOR SWITCH ON IRS MSU TO OFF. WAIT UNTIL ALIGN LIGHT 
---10-MINUTE ALIGNMENT)(DURING OR FOLLOWINGFLASHING  04 VALUE.LATITUDE, OR LONGITUDE ENTERED IS NOT WITHIN 1 DEGREE OF THE STORED THE IRS ISDU OR THE FMC CDU.____NOTE: TRANSMIT THE PRESENT POSITION TO THE IRSSET IRS POSITION LINE. THEN LINE SELECT KEY (LSK) 4R TOWHETHER A PREVIOUS POSITION OR BOX PROMPTS ARE DISPLAYED ON THEPOSITION MUST BE RELOADED INTO THE CDU SCRATCH PAD REGARDLESS OFTO RE-ENTER PRESENT POSITION USING THE FMC CDU, THE PRESENTRE-ENTER THE IDENTICAL POSITION TO THE LAST POSITION ENTERED, USING
FAST REALIGNMENT) ---(DURING 30-SECONDFLASHING  04 WITHIN 1 DEGREE OF LAST COMPUTED VALUE.ENTERED LATITUDE IS NOT WITHIN 0.5 DEGREE, OR ENTERED LONGITUDE IS NOT OUT (APPROXIMATELY 30 SEC). RESTART THE 10-MINUTE ALIGNMENT PROCEDURE.FLASH, PLACE MODE SELECTOR SWITCH TO OFF. WAIT UNTIL ALIGN LIGHT GOESENTER KNOWN ACCURATE PRESENT POSITION. IF ALIGN LIGHT CONTINUES TO 
------ 05  LEFT DAA IS TRANSMITTING A FAULT CONDITION. THAT INTERFACES WITH LEFT DAA.REPLACE LEFT DAA. IF MALFUNCTION CODE 05 PERSISTS, CHECK EQUIPMENT
------ 06 RIGHT DAA IS TRANSMITTING A FAULT CONDITION.  THAT INTERFACES WITH RIGHT DAA.REPLACE RIGHT DAA. IF MALFUNCTION CODE 06 PERSISTS, CHECK EQUIPMENT
------ 07 SELECTED IRU HAS DETECTED AN INVALID AIR DATA INPUT. REPLACE DADC.

IRS Malfunction Codes
Figure 102 (Sheet 1)

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A 737-300/400/500MAINTENANCE MANUAL
---(AFTER 10 MINUTES)FLASHINGSTATUS(OVERHEAD PANEL)MODE SELECTOR UNITALIGN ANNUNCIATOR FAULT LIGHTSTATUS  08IRS(INDICATED ON ISDU,MALFUNCTION CODESOVERHEAD PANEL)  PRESENT POSITION HAS NOT BEEN ENTERED.SIGNIFICANCE OF ALIGN ANNUNCIATORAND MALFUNCTION CODES ENTER PRESENT POSITION.ENTER PRESENT POSITION. IF MALFUNCTION CODE 08 PERSISTS, USE ISDU TORECOMMENDED ACTION 
---SECONDS, ATT FLAG DISAPPEARSFLIGHT INSTRUMENTS. AFTER 30AND ALIGN LIGHT GOES OUT. ISDU DISPLAYS NO DATA OTHER THANSTATUS. STEADYATT AND HDG FLAGS APPEAR ONIN ADDITION TO THE ALIGN LIGHT,  09HEADING IS ENTERED)WILL CLEAR, WHEN(MALFUNCTION CODE ATTITUDE MODE HAS BEEN SELECTED.ATT.NAV CAPABILITY IS LOST WHEN MODE SELECTOR SWITCH IS PLACED TO____NOTE:  ENTER MAGNETIC HEADING, USING THE ISDU OR FMS CDU POS INIT PAGE 1/2.(APPROXIMATELY 30 SEC). RESTART THE 10-MINUTE ALIGNMENT PROCEDURE. FIRST. HEADING FLAGS WILL DISAPPEAR WHEN HEADING IS ENTERED.IF THE ISDU IS USED TO ENTER HEADING, THE LETTER H MUST BE ENTEREDIF ATTITUDE MODE IS DESIRED:PLACE MODE SELECTOR SWITCH TO OFF. WAIT UNTIL ALIGN LIGHT GOES OUTIF ATTITUDE MODE IS NOT DESIRED:
　
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