IRS Alignment-Warning, Restoration Procedure
Figure 101

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 ú ú 01 Page 108 ú Nov 15/92
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A 737-300/400/500MAINTENANCE MANUAL
FLASHING(AFTER 10 MINUTES) ---STATUSFAULT LIGHTALIGN ANNUNCIATORMODE SELECTOR UNIT(OVERHEAD PANEL)STATUS  NONEOVERHEAD PANEL)MALFUNCTION CODES(INDICATED ON ISDU,IRS  FAILED ALIGN REQUIREMENT.AND MALFUNCTION CODESSIGNIFICANCE OF ALIGN ANNUNCIATOR THE SET IRS POSITION LINE. THEN LINE SELECT KEY (LSK) 4R TOOF WHETHER A PREVIOUS POSITION OR BOX PROMPTS ARE DISPLAYED ONPOSITION MUST BE RELOADED INTO THE CDU SCRATCH PAD REGARDLESSTO RE-ENTER PRESENT POSITION USING THE FMC CDU, THE PRESENTVERIFY AND THEN RE-ENTER A KNOWN ACCURATE PRESENT POSITION, USING THETRANSMIT THE PRESENT POSITION TO THE IRSNOTE:____ISDU OR THE FMC CDU. RECOMMENDED ACTION
ON--- NONE  LASER INTENSITY DEGRADATION THE IRU IS STILL OPERABLE.DEFER MAINTENANCE UNTIL A REPLACEMENT OF THE IRU IS AVAILABLE, SINCEREPLACE THE IRU; OR, IF IRU MAINTENANCE CAPABILITY IS NOT AVAILABLE,
------ 01  ISDU FAILED TO PASS A POWER UP RAM TEST OR PROM SUMCHECK TEST.  REPLACE ISDU.
ONSTEADY  02  FAILED ALIGN REQUIREMENT. PRESENT POSITION HAS BEEN ENTERED TWICE,BUT ENTERED LATITUDE DISAGREES WITH LATITUDE CALCULATED BY IRU. MODE SELECTOR TO OFF. WAIT UNTIL ALIGN LIGHT GOES OUT (APPROXIMATELYVERIFY AND THEN RE-ENTER A KNOWN ACCURATE PRESENT POSITION (TWICE, IFREQUIRED, USING IDENTICAL ENTRIES). IF FAULT LIGHT PERSISTS, PLACE30 SECONDS). RESTART THE 10-MINUTE ALIGNMENT PROCEDURE. IF MALFUNCTION CODE 02 PERSISTS, REPLACE IRU.
---ON  02  IRU FAILURE. REPLACE IRU.
FLASHING --- 03  EXCESSIVE MOTION OF AIRPLANE DURING THE ALIGNMENT PERIOD. PLACE MODE SELECTOR SWITCH ON IRS MSU TO OFF. WAIT UNTIL ALIGN LIGHTGOES OUT (APPROXIMATELY 30 SECONDS). RESTART THE 10-MINUTE ALIGNMENTPROCEDURE.
FLASHING(DURING OR FOLLOWING10-MINUTE ALIGNMENT) --- 04  LATITUDE, OR LONGITUDE ENTERED IS NOT WITHIN 1 DEGREE OF THE STOREDVALUE. OF WHETHER A PREVIOUS POSITION OR BOX PROMPTS ARE DISPLAYED ONPOSITION MUST BE RELOADED INTO THE CDU SCRATCH PAD REGARDLESSTHE SET IRS POSITION LINE. THEN LINE SELECT KEY (LSK) 4R TORE-ENTER THE IDENTICAL POSITION TO THE LAST POSITION ENTERED, USINGTO RE-ENTER PRESENT POSITION USING THE FMC CDU, THE PRESENTTRANSMIT THE PRESENT POSITION TO THE IRSNOTE:____THE IRS ISDU OR THE FMC CDU.
FLASHING(DURING 30-SECONDFAST REALIGNMENT) --- 04  ENTERED LATITUDE IS NOT WITHIN 0.5 DEGREE, OR ENTERED LONGITUDE IS NOTWITHIN 1 DEGREE OF LAST COMPUTED VALUE.  ENTER KNOWN ACCURATE PRESENT POSITION. IF ALIGN LIGHT CONTINUES TOFLASH, PLACE MODE SELECTOR SWITCH TO OFF. WAIT UNTIL ALIGN LIGHT GOESOUT (APPROXIMATELY 30 SEC). RESTART THE 10-MINUTE ALIGNMENT PROCEDURE.
------ 05 LEFT DAA IS TRANSMITTING A FAULT CONDITION.____NOTE: DAA ERROR CODES CAN BE INDICATED WITHOUT ANY ASSOCIATED EFIS FLAGS. REPLACE LEFT DAA. IF MALFUNCTION CODE 05 PERSISTS, CHECK EQUIPMENTTHAT INTERFACES WITH LEFT DAA.
------ 06 RIGHT DAA IS TRANSMITTING A FAULT CONDITION.____NOTE: DAA ERROR CODES CAN BE INDICATED WITHOUT ANY ASSOCIATED EFIS FLAGS.  REPLACE RIGHT DAA. IF MALFUNCTION CODE 06 PERSISTS, CHECK EQUIPMENTTHAT INTERFACES WITH RIGHT DAA.
------ 07 SELECTED IRU HAS DETECTED AN INVALID AIR DATA INPUT. REPLACE DADC. 

IRS Malfunction Codes
Figure 102 (Sheet 1)

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 ú ú 01 Page 109 ú Nov 12/01

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
(AFTER 10 MINUTES)FLASHING ---STATUSFAULT LIGHTALIGN ANNUNCIATORMODE SELECTOR UNIT(OVERHEAD PANEL)STATUS  08OVERHEAD PANEL)MALFUNCTION CODES(INDICATED ON ISDU,IRS  PRESENT POSITION HAS NOT BEEN ENTERED.AND MALFUNCTION CODESSIGNIFICANCE OF ALIGN ANNUNCIATOR ENTER PRESENT POSITION.ENTER PRESENT POSITION. IF MALFUNCTION CODE 08 PERSISTS, USE ISDU TORECOMMENDED ACTION
STEADY STATUS.SECONDS, ATT FLAG DISAPPEARSFLIGHT INSTRUMENTS. AFTER 30ATT AND HDG FLAGS APPEAR ONIN ADDITION TO THE ALIGN LIGHT,DISPLAYS NO DATA OTHER THANAND ALIGN LIGHT GOES OUT. ISDU --- 09HEADING IS ENTERED)WILL CLEAR, WHEN(MALFUNCTION CODE  ATT.NAV CAPABILITY IS LOST WHEN MODE SELECTOR SWITCH IS PLACED TO____NOTE:ATTITUDE MODE HAS BEEN SELECTED. IF ATTITUDE MODE IS NOT DESIRED:FIRST. HEADING FLAGS WILL DISAPPEAR WHEN HEADING IS ENTERED.IF ATTITUDE MODE IS DESIRED:ENTER MAGNETIC HEADING, USING THE ISDU OR FMS CDU POS INIT PAGE 1/2.(APPROXIMATELY 30 SEC). RESTART THE 10-MINUTE ALIGNMENT PROCEDURE.IF THE ISDU IS USED TO ENTER HEADING, THE LETTER H MUST BE ENTEREDPLACE MODE SELECTOR SWITCH TO OFF. WAIT UNTIL ALIGN LIGHT GOES OUT 
　
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