# ATR Service Bulletin ATR72-31-1117 Copy: Revision 4 ("SB ATR72-31-1117_R04"), 18 pages: PDF https://openairdocs.org/files/sha256/0e/44/0e44bcd953ec192ab5b652f5766db43dc34d85f1a0ffc6c486cb623fff118405; text https://openairdocs.org/service-documents/atr/atr72-31-1117/file/0e44bcd953ec.md. Rights: © ATR. Filed by the FAA in regulations.gov docket FAA-2023-0012, the docket of AD 2023-06-01. Not covered by OpenAirDocs’ CC0 dedication. ## Details - Manufacturer: [ATR](https://openairdocs.org/service-documents/atr.md) - Type: Service bulletin (Service Bulletin) - Number: ATR72-31-1117 - Latest revision known: ATR72-31-1117, Revision 4 (OpenAirDocs) - Page: https://openairdocs.org/service-documents/atr/atr72-31-1117 ## Text (18 pages) Rights: © ATR. Filed by the FAA in regulations.gov docket FAA-2023-0012, the docket of AD 2023-06-01. Not covered by OpenAirDocs’ CC0 dedication. Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page TS-1 of TS-3 TRANSMITTAL SHEET Revision No. 04 This page transmits Revision No. 04 of Service Bulletin No. ATR72-31-1117. General information concerning this document is available in Service Letter No. ATR72-00-6005. TITLE: Indicating/Recording systems - New Avionics Suite - Installation of standard 3.1 software  ATR. All rights reserved. Confidential and proprietary document. This document shall not be reproduced or disclosed to a third party without the written consent of ATR. This document and its content shall not be used for any purpose other than that for which it is supplied. ATR, its logo, the distinctive ATR aircraft profiles and patented information relating to the ATR aircraft are the exclusive property of ATR and are subject to copyright. This document and all information contained herein are the sole property of ATR. No intellectual property right is granted through, or induced by, the delivery of this document or the disclosure of its content. ### Page 2 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page TS-2 of TS-3  ATR. All rights reserved. Confidential and proprietary document. 1 – ADDITIONAL WORK A- IMPACT ON PROCEDURE The changes introduced by this Revision do not affect aircraft on which the present Service Bulletin has already been applied. B- IMPACT ON COMPONENTS The associated equipment already delivered remain valid. 2 – TECHNICAL IMPACT ON REVISED PAGES Layout changes due to computerization of this revision are not identified. Page PI-3 - Para. 1.A.(2), MSN 1555 added. Page PI-5 - Para. 1.D., sentence updated. 3 – TABLE OF CONTENTS TRANSMITTAL SHEET ................................................................................. Page TS-1 to TS-3 ACCOMPLISHMENT REPORT ..................................................................... Page AR-1 to AR-1 PLANNING INFORMATION ............................................................................. Page PI-1 to PI-7 MATERIAL INFORMATION ............................................................................ Page MI-1 to MI-3 ACCOMPLISHMENT INSTRUCTIONS ............................................................ Page AI-1 to AI-4 ILLUSTRATIONS ................................................................................................................ None ### Page 3 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page TS-3 of TS-3  ATR. All rights reserved. Confidential and proprietary document. 4 – REVISION SEQUENCES Issue or Revision Date Additional work Original issue Jul 09/19 - Revision No. 01 Jul 26/19 No Revision No. 02 Nov 27/19 No Revision No. 03 Mar 25/20 No Revision No. 04 Jul 30/20 No ### Page 4 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page AR-1  ATR. All rights reserved. Confidential and proprietary document. ACCOMPLISHMENT REPORT SERVICE BULLETIN No. ATR72-31-1117 Revision No. 04 TITLE: Indicating/Recording systems - New Avionics Suite - Installation of standard 3.1 software Send this report to: ATR RETROFIT ENGINEERING 1 ALLEE PIERRE NADOT 31712 BLAGNAC CEDEX FRANCE phone : +33 (0)5 62 21 62 21 fax : +33 (0)5 62 21 69 41 e-mail : techdesk@atr-aircraft.com Aircraft identification Aircraft MSN (on which this Service Bulletin has been accomplished): Aircraft registration number: Flight cycles: Flight hours: Accomplishment date of this Service Bulletin: Maintenance organisation identification Maintenance organisation name: Name & Signature: Date: ### Page 5 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page PI-1  ATR. All rights reserved. Confidential and proprietary document. COMPLIANCE: RECOMMENDED MODIFICATION: 07970 L3338 07474 L2674 (SEE NOTE 4) 07364 L2552 (SEE NOTE 2) 07348 L2520 (SEE NOTE 3) TITLE: Indicating/Recording systems - New Avionics Suite - Installation of standard 3.1 software 1. PLANNING INFORMATION A. EFFECTIVITY (1) Aircraft models The approved change used to generate this document has been certified on the following ATR72 models: ATR72-101 ATR72-102 ATR72-201 ATR72-202 ATR72-211 ATR72-212 ATR72-212A NO NO NO NO NO NO YES (2) Aircraft MSN Kit(s) 940, 958, 960, 966, 967, 968, 969, 970, 971, 972, 973, 987, 988, 989, 991, 992, 993, 995, 996, 997, 998, 999, 1020, 1021, 1022, 1023, 1025, 1026, 1027, 1028, 1030, 1031, 1032, 1033, 1034, 1035, 1038, 1039, 1040, 1041, 1042, 1043, 1044, 1045, 1046, 1047, 1049, 1051, 1052, 1053, 1054, 1056, 1057, 1058, 1059, 1060, 1061, 1063, 1064, 1065, 1066, None ### Page 6 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page PI-2  ATR. All rights reserved. Confidential and proprietary document. MSN (continued) Kit(s) 1067, 1068, 1069, 1070, 1072, 1073, 1074, 1075, 1076, 1077, 1078, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086, 1087, 1088, 1089, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098, 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109, 1110, 1111, 1112, 1113, 1114, 1115, 1116, 1117, 1118, 1119, 1120, 1121, 1122, 1123, 1124, 1125, 1126, 1127, 1128, 1129, 1130, 1131, 1132, 1133, 1134, 1135, 1136, 1137, 1138, 1139, 1140, 1142, 1143, 1144, 1145, 1146, 1147, 1148, 1149, 1150, 1151, 1152, 1153, 1154, 1155, 1156, 1158, 1159, 1160, 1161, 1162, 1163, 1164, 1165, 1166, 1167, 1168, 1169, 1170, 1171, 1172, 1173, 1174, 1175, 1176, 1177, 1178, 1179, 1180, 1181, 1182, 1183, 1184, 1185, 1186, 1187, 1188, 1189, 1190, 1191, 1192, 1193, 1194, 1195, 1196, 1197, 1198, 1199, 1200, 1220, 1221, 1222, 1223, 1224, 1225, 1226, 1227, 1228, 1229, 1230, 1231, 1232, 1233, 1235, 1236, 1237, 1238, 1239, 1240, 1241, 1242, 1243, 1244, 1245, 1246, 1247, 1248, 1249, 1250, 1251, 1252, 1253, 1254, 1255, 1256, 1257, 1258, 1259, 1260, 1261, 1262, 1263, 1264, 1265, 1266, 1267, 1268, 1269, 1270, 1271, 1272, 1273, 1274, 1275, 1276, 1277, 1278, 1279, 1280, 1281, 1282, 1283, 1284, 1285, 1286, 1287, 1288, 1289, 1290, 1291, 1292, 1294, 1295, 1296, 1297, 1298, 1299, 1300, 1301, 1302, 1303, 1304, 1305, 1306, 1307, 1308, 1309, 1310, 1311, 1312, 1313, 1314, 1315, 1316, 1317, 1318, 1319, 1320, 1321, 1322, 1323, 1324, 1325, 1326, 1327, 1328, 1329, 1330, 1331, 1332, 1333, 1334, 1335, 1336, 1337, 1338, 1339, 1340, 1341, 1342, 1343, 1344, 1345, 1346, 1347, 1348, 1349, 1350, 1351, 1352, 1353, 1354, 1355, 1356, 1357, 1358, 1359, 1360, 1361, 1362, 1363, 1364, 1365, 1366, 1367, 1368, 1369, 1370, 1371, 1372, 1373, 1374, 1375, 1376, 1377, 1378, 1379, 1380, 1381, 1382, 1383, 1384, 1385, 1386, 1387, 1388, 1389, 1390, 1391, None ### Page 7 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page PI-3  ATR. All rights reserved. Confidential and proprietary document. MSN (continued) Kit(s) 1392, 1393, 1394, 1395, 1396, 1397, 1398, 1399, 1400, 1420, 1421, 1422, 1423, 1424, 1425, 1426, 1427, 1428, 1429, 1430, 1431, 1432, 1433, 1434, 1435, 1436, 1437, 1438, 1439, 1440, 1441, 1442, 1443, 1444, 1445, 1446, 1447, 1448, 1449, 1450, 1451, 1452, 1453, 1454, 1455, 1456, 1457, 1458, 1459, 1460, 1461, 1462, 1463, 1464, 1465, 1466, 1467, 1468, 1469, 1470, 1471, 1472, 1473, 1474, 1475, 1476, 1477, 1478, 1479, 1480, 1481, 1482, 1483, 1484, 1485, 1486, 1487, 1488, 1489, 1490, 1491, 1492, 1493, 1494, 1495, 1496, 1497, 1498, 1499, 1500, 1501, 1502, 1503, 1504, 1505, 1506, 1507, 1508, 1509, 1510, 1511, 1512, 1513, 1514, 1515, 1516, 1517, 1518, 1519, 1520, 1521, 1522, 1523, 1524, 1525, 1526, 1527, 1528, 1529, 1530, 1531, 1532, 1533, 1534, 1535, 1536, 1537, 1538, 1539, 1540, 1541, 1543, 1546, 1548, 1549, 1551, 1553, 1554, 1555, 1558, 1560, 1562, 1563, 1567, 1568, 1569, 1572, 1577, 1579 None For each aircraft MSN, operator should order the mentioned kit(s). Other parts or equipment could be required for embodiment of this Service Bulletin. Please refer to chapter "MATERIAL INFORMATION" for details. NOTE 1: This Service Bulletin is applicable only on aircraft on which all the following modifications have been embodied: - No. 06977 or Service Bulletin No. ATR72-31-1092, - No. 07251 or Service Bulletin No. ATR72-34-1140, - No. 07586 or Service Bulletin No. ATR72-31-1108. NOTE 2: For aircraft not yet equipped with modification No. 07364, accomplishment of this Service Bulletin validates this modification in the aircraft configuration status. NOTE 3: For aircraft not yet equipped with modification No. 07348, accomplishment of this Service Bulletin validates this modification in the aircraft configuration status. ### Page 8 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page PI-4  ATR. All rights reserved. Confidential and proprietary document. NOTE 4: For aircraft not yet equipped with modification No. 07474, accomplishment of this Service Bulletin validates this modification in the aircraft configuration status. NOTE 5: For aircraft equipped with modification No. 05965 or Service Bulletin No. ATR72-34-1114, accomplishment of this Service Bulletin requires previous or simultaneous accomplishment of modification No. 07145 or Service Bulletin No. ATR72-34-1141. NOTE 6: For aircraft equipped with modification No. 07889 or Service Bulletin No. ATR72-34-1159, accomplishment of this Service Bulletin requires previous or simultaneous accomplishment of modification No. 07960 or Service Bulletin No. ATR72-34-1161. (3) Spares The following stock items are modifiable (or not) according to the table below. None. B. REASON The aim of this Service Bulletin is to install the NAS standard 3.1 software and Electronic Check List (ECL) Version V26. Embodiment of this Service Bulletin: - Deselects SBAS GPS mode except for aircraft equipped with LPV function. - Cancels OEB No. 36: Bank angle limitation in severe icing conditions. COMPLIANCE: Accomplishment of this Service Bulletin is recommended by ATR. C. DESCRIPTION Accomplishment of this Service Bulletin consists in carrying out the following jobs: (1) In zone 210, replacement of Integrated Avionics Display (IAD) software (2) On 81VU and 82VU shelves, replacement of Core Processing Module (CPM) software (3) On 81VU and 82VU shelves, replacement of Flight Warning Main Configuration File (FWMCF) software (4) Updating of NAS options configuration file ### Page 9 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page PI-5  ATR. All rights reserved. Confidential and proprietary document. D. APPROVAL The technical content of this document (Rev. No. 04) is approved under the authority of the DOA ref. EASA.21J.044. E. MANPOWER Manhours Mechanic None Electrician 1 Total manhours 1 Elapsed time (hours) 1 The above estimates are only provided for general guidance in operator's modification planning. NOTE: This Service Bulletin assumes that the aircraft has been placed in the appropriate maintenance configuration. The manhours/elapsed time estimates do not include preparation for the modification, non-productive elapsed time or administrative functions. F. WEIGHT AND BALANCE None. G. REFERENCES The following publications have to be used during accomplishment of this Service Bulletin: MP : ATR-A-45-31-XX-00ZZZ-752Z-A ATR-A-45-42-XX-00ZZZ-752Z-A ATR-A-45-42-XX-01ZZZ-752Z-A ATR-A-45-42-XX-02ZZZ-752Z-A Service Letter No. ATR72-00-6007 ### Page 10 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page PI-6  ATR. All rights reserved. Confidential and proprietary document. The following modifications and/or retrofit documents are mentioned on this Service Bulletin: Modification Retrofit document Title 05965 ATR72-34-1114 Navigation - New Avionics Suite - Install a second GPS 06977 ATR72-31-1092 Indicating/Recording systems - New Avionics Suite - Installation of standard 2 software 07145 ATR72-34-1141 Navigation - New Avionics Suite - Install wiring between GPS2 and CAC1 and 2 07251 ATR72-34-1140 Navigation - New Avionics Suite - Install wiring between GPS1 and CAC1 and 2 07348 ATR72-31-1095 Indicating/Recording systems - New Avionics Suite - Install Electronic Check List V21 07364 ATR72-31-1096 Indicating/Recording systems - New Avionics Suite - Installation of standard 2.1 software 07474 ATR72-31-1107 Indicating/Recording systems - New Avionics Suite - Installation of standard 3 software 07586 ATR72-31-1108 Indicating/Recording systems - New Avionics Suite - Install DMU software P/N L04451-1006 and FDAU software P/N L04450-1002 07889 ATR72-34-1159 Navigation - New Avionics Suite - Update ASDB and ACD software on T²CAS for GPS source selection improvement 07960 ATR72-34-1161 Navigation - New Avionics Suite - Deactivate "TERR DEGRADED" caution H. AFFECTED PUBLICATIONS (1) Maintenance documentation The following maintenance manuals will be updated after receipt of the Accomplishment Report by ATR: AFI : 22-16 34-58 MIPD : 31-63 42-11 ### Page 11 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page PI-7  ATR. All rights reserved. Confidential and proprietary document. MP : ATR-A-31-31-80-00ZZZ-271Z-A ATR-A-45-34-XX-02ZZZ-752Z-A ATR-A-45-42-XX-02ZZZ-752Z-A SD : 34-61 (2) Operational documentation The following operational manuals are impacted. (a) Operators should verify the List of Modifications (LOM) of these manuals to verify that the modification(s) No. 07474 and 07970 are mentioned. AFM : The EASA AFM revision is approved. In case of specific AFM issued for a local Authority, the operator must make sure the corresponding AFM revision has been approved by its local Authority. FCOM QRH (b) Operators should verify the List of Modifications (LOM) of these manuals to verify that the modification No. 07364 is mentioned. FCOM QRH ### Page 12 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page MI-1  ATR. All rights reserved. Confidential and proprietary document. 2. MATERIAL INFORMATION A. MATERIAL - COST AND AVAILABILITY (1) Equipment Equipment cost and availability, or any further commercial information about Service Bulletin, may be consulted through ATRactive or operator should contact ATR at the following addresses: www.atractive.com ATR CUSTOMER SERVICES SPARES SUPPORT 1 ALLEE PIERRE NADOT 31712 BLAGNAC CEDEX FRANCE e-mail : spares.toulouse@atr-aircraft.com Or operator should contact the ATR center it is related to, according to its operational area, at the following addresses: ATR Americas, Inc. 4355 NW 36th St. Miami Springs, FL 33166 USA phone : +1 (305) 704 9809 fax : +1 (305) 704 9806 e-mail : commercial.services.miami@atr-aircraft.com ATR EASTERN SUPPORT Pte Ltd. 51 CHANGI BUSINESS PARK CENTRAL 2 #08-02 THE SIGNATURE SINGAPORE 486066 phone : +65 6542 0122 fax : +65 6542 1047 e-mail : commercial.services.singapore@atr-aircraft.com ### Page 13 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page MI-2  ATR. All rights reserved. Confidential and proprietary document. B. LIST OF COMPONENTS Item Part Number Qty Description Equipment - F1424356 1 FWMCF software V26 (FIN 1TF1SW3 and 1TF2SW3) - F1540040 1 CPM software (FIN 1TF1SW1 and 1TF2SW1) - F1601006 1 IAD software (FIN 1WK1SW1, 1WK2SW1, 2WKSW1, 3WK1SW1 and 3WK2SW1) C. LIST OF MATERIALS - OPERATOR SUPPLIED None. D. SPECIAL TOOLS Accomplishment of this Service Bulletin requires use of the following special tools: Part Number Qty Description Refer to NOFU - CD-rom burnt with configuration file CD-rom automatically supplied upon ATR Service Bulletin order placement G2942AAD01 1 PMAT Software Suite (1) (1) PMAT Software Suite is delivered through Master media P/N F1424010. NOTE: NOFU - NAS options follow-up is an ATR document provided to present the status of the options linked to the New Avionics Suite. Refer to Service Letter No. ATR72-00-6007. ### Page 14 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page MI-3  ATR. All rights reserved. Confidential and proprietary document. Operator should place a purchase order to the ATR center it is related to, according to its operational area, at the following addresses: ATR CUSTOMER SERVICES SPARES SUPPORT 1 ALLEE PIERRE NADOT 31712 BLAGNAC CEDEX FRANCE e-mail : commercial.services@atr-aircraft.com ATR Americas, Inc. 4355 NW 36th St. Miami Springs, FL 33166 USA phone : +1 (305) 704 9809 fax : +1 (305) 704 9806 e-mail : commercial.services.miami@atr-aircraft.com ATR EASTERN SUPPORT Pte Ltd. 51 CHANGI BUSINESS PARK CENTRAL 2 #08-02 THE SIGNATURE SINGAPORE 486066 phone : +65 6542 0122 fax : +65 6542 1047 e-mail : commercial.services.singapore@atr-aircraft.com For PMAT Software Suite: THALES AVIONICS 105, AVENUE DU GENERAL EISENHOWER BP 63647 31036 TOULOUSE CEDEX 1 FRANCE Attn : Services Delivery Administrator phone : +33 (0)5 61 19 35 32 e-mail : e-services.subscription@fr.thalesgroup.com ### Page 15 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page AI-1  ATR. All rights reserved. Confidential and proprietary document. 3. ACCOMPLISHMENT INSTRUCTIONS A. GENERAL The following instructions assume that work will be accomplished when the aircraft is in the appropriate maintenance configuration. B. JOB SET-UP None. C. MODIFICATION (1) In zone 210, replacement of Integrated Avionics Display (IAD) software As per MP ATR-A-45-31-XX-00ZZZ-752Z-A, load IAD software on the five IAD using all the parts listed in the following table. Carefully follow the specific instruction(s) detailed after the table. INSTALLATION Item Description Part Number Qty New Qty from Removal Figure - IAD software (FIN 1WK1SW1, 1WK2SW1, 2WKSW1, 3WK1SW1 and 3WK2SW1) F1601006 1 - - Specific instruction(s): After loading the new IAD software, discard the old CD-ROM version. ### Page 16 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page AI-2  ATR. All rights reserved. Confidential and proprietary document. (2) On 81VU and 82VU shelves, replacement of Core Processing Module (CPM) software As per MP ATR-A-45-42-XX-00ZZZ-752Z-A, load CPM software on the two CPM using all the parts listed in the following table. Carefully follow the specific instruction(s) detailed after the table. INSTALLATION Item Description Part Number Qty New Qty from Removal Figure - CPM software (FIN 1TF1SW1 and 1TF2SW1) F1540040 1 - - Specific instruction(s): After loading the new CPM software, discard the old CD-ROM version. (3) On 81VU and 82VU shelves, replacement of Flight Warning Main Configuration File (FWMCF) software CAUTION: DURING UPLOADING OF FWMCF SOFTWARE USE PMAT SOFTWARE P/N G2942AAD01 (REFER TO PARA 2.D. SPECIAL TOOLS). As per MP ATR-A-45-42-XX-02ZZZ-752Z-A, load FWMCF software on the two CPM using all the parts listed in the following table. Carefully follow the specific instruction(s) detailed after the table. INSTALLATION Item Description Part Number Qty New Qty from Removal Figure - FWMCF software V26 (FIN 1TF1SW3 and 1TF2SW3) F1424356 1 - - ### Page 17 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page AI-3  ATR. All rights reserved. Confidential and proprietary document. Specific instruction(s): After loading the new FWMCF software, discard the old CD-ROM version. (4) Updating of NAS options configuration file Upload the new configuration file of the options installed. As per MP ATR-A-45-42-XX-01ZZZ-752Z-A, load new configuration file. D. TESTS NOTE: To change page on MCDU, use "NEXT" pushbutton. (1) On MCDU, menu "ACMS", select "AVS" then "LRU IDENT" then "CAC" then "CPM". (2) Verify for CPM1 and CPM2 that: CSW P/N is : K4018AAB01 MCCT P/N is : G6041AAH01 FWMCF P/N is : G2868AAH05 FWALCF P/N is : K2630AAA05 CMFT P/N is : G2912AAE01 CMA SW P/N is : G2874AAE02 AFCA SW P/N is : G2865AAH02 DCA SW P/N is : G2875AAH01 FWA SW P/N is : G2867AAJ02 (3) Select "RETURN" twice then "LRU IDENT" then "DU". (4) Verify for DU1, DU2, DU3, DU4 and DU5 that: IAD SW P/N is : G7955AAM02 FMPDB42 P/N is : K7704AAE02 FMPDB72 P/N is : G6458AAE02 FMSC42 P/N is : K7705AAF01 FMSC72 P/N is : G6456AAF01 (5) Configure each display unit as following: - On Captain side: . DU#1 : PFD . DU#2 : MFD ### Page 18 SERVICE BULLETIN ATR72 Revision No. 04 - Jul 30/20 Service Bulletin No. ATR72-31-1117 Page AI-4  ATR. All rights reserved. Confidential and proprietary document. - On F/O side: . DU#3 : EWD . DU#4 : MFD . DU#5 : PFD (6) On each display unit check that: - No abnormal behaviour at power ON. - No cross is displayed. - Displayed information is consistent with current aircraft configuration. (7) For DU#2 (respectively DU#4), cycle through all MFD formats (ND, SYS, PERF…) by using the EFCP-Left (respectively EFCP-Right) pushbuttons, and make sure that no indication is displayed in contradiction with the overhead panel (invalid or flagged data). (8) For DU#2 (respectively DU#4), use the "PFD/EWD/MFD" pushbutton on CAPT (respectively F/O) side, and check that the display is manually reconfigured in the three different formats. E. CLOSE-UP None. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.