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1 revision letter
DATE: July 31st, 2024 EOS-2646/24
Subject: ATR72 Time Limits Document Temporary Revision 22.1 dated July 30th, 2024
Dear Customer,
Temporary Revision 22.1 of the ATR72 Time Limits Document is issued to introduce the impacts of MOD 10453 “REMOVE TLU COMMAND-MONITORING COMMON POINT”.
The technical content of this Temporary Revision is concentrated on:
- Section 2-2 Limitations: to revise and introduce several ATA 27 CMRs.
Please refer to Section 0-4 Reasons for Revision for further details on the content of this revision.
For any additional information, please contact technical desk through ATRactive portal via “Request ATR”.
Sincerely,
ATR Scheduled Maintenance Team
ATR72 TIME LIMITS
Date: July 30th, 2024 Section 0-0 Page: 1 ISSUE: TR 22.1 Printed in France
ADMINISTRATIVE SECTION
RECORD OF TEMPORARY REVISION
REVISION N° DATE APPROVAL
TR 22.1 July 2024 Refer to EASA major change approval:
10084922 REV. 1 dated 30 July 2024
MEASA European Union Aviation Safety Agency
MAJOR CHANGE APPROVAL 10084922 REV. 1 This Certificate/Approval is issued by EASA, acting in accordance with Regulation (EU) 2018/1139 on behalf of the European Union, its Member States and of the European third countries that participate in the activities of EASA under Article 129 of that Regulation and in accordance with Commission Regulation (EU) No. 748/2012 to
ATR AVIONS DE TRANSPORT REGIONAL G.I.E 1 ALLEE PIERRE NADOT 31712 BLAGNAC FRANCE EASA.21J.044 and certifies that the change in the type design for the product listed below with the limitations and conditions specified meets the applicable Type Certification Basis and, if applicable, environmental protection requirements when operated within the conditions and limitations specified below:
Type Certificate Number: EASA.A.084 Type Certificate Holder: ATR Type: ATR42/ATR72 Model: ATR 72-101 ATR 72-102 ATR 72-201 ATR 72-202 ATR 72-211 ATR 72-212 ATR 72-212 A Description of Design Change:
MOD 10453 - ATR 72 The current MOD aims to remove TLU (Rudder Travel Limitation Unit) command-monitoring common point between control and monitoring TLU. This modification changes the combination of IAS signals from OR to AND. If signals are not consistent for more than 25 seconds, the FLT CTL TLU caution is displayed on the EWD.
See Continuation Sheet (s) For the European Union Aviation Safety Agency Cologne, Germany, 30 July 2024 Olivier ROBELIN Section Manager Regional Transport Aeroplanes Task Number: 60088311 ATR AVIONS DE TRANSPORT REGIONAL G.I.E - 300714 An Agency of the European Union TE.CERT.00091-005 © European Union Aviation Safety Agency. All rights reserved. ISO9001 Certified Page 1 of 2
MEASA MAJOR CHANGE APPROVAL - 10084922 REV. 1 European Union Aviation Safety Agency EASA Certification Basis:
The Type and OSD Certification Bases (CB) for the original product remains applicable to this certificate/ approval.
The requirements for environmental protection and the associated certified noise and/ or emissions levels of the product are unchanged and remain applicable to this certificate/approval without any impact on the noise database.
Associated Technical Documentation:
CTCA - FLIGHT CONTROLS - ATR 72 - REMOVE TLU COMMAND-MONITORING COMMON POINT - MOD 10453 Issue 02 dated 09 July 2024 EOO-2908/23 - AFM MAJOR CHANGE PROJECT FOR MOD 10453 Issue 3 dated 26 June 2024 ATR 72 Time Limits Document (TLD) Temporary Revision (TR) 22.1 EOO-2948/23 - Substantiation Note for MMEL Changes linked to MOD 10453 Issue 2 dated 21 June 2024 or later revisions of the above listed document (s) approved/accepted under the EASA system.
Limitations/Conditions:
None
- End - Task Number: 60088311 ATR AVIONS DE TRANSPORT REGIONAL G.I.E - 300714 An Agency of the European Union TE.CERT.00091-005 © European Union Aviation Safety Agency. All rights reserved. ISO9001 Certified. Page 2 of 2
ATR72 TIME LIMITS
ADMINISTRATIVE SECTION
Date: July 30th, 2024 Section 0-3 Page: 1 ISSUE: TR 22.1 Printed in France
LIST OF EFFECTIVE TEMPORARY PAGES
SECTIONS CHAPTER NUMBER of PAGES ISSUE 0 ADMINISTRATIVE SECTION 0-0 RECORD OF TEMPORARY REVISION 1 Jul 24 0-3 LIST OF EFFECTIVE TEMPORARY PAGES 1 Jul 24 0-4 REASONS FOR TEMPORARY REVISION 22.1 1 Jul 24
2 CERTIFICATION MAINTENANCE REQUIREMENTS 2-2 LIMITATIONS 1 Jul 24
ATR72 TIME LIMITS
ADMINISTRATIVE SECTION
Date: July 30th, 2024 Section 0-4 Page: 1 ISSUE: TR 22.1 Printed in France REASONS FOR TEMPORARY REVISION 22.1
GENERAL Temporary Revision 22.1 is issued to introduce, revise, and delete some ATA 27 CMR references regarding the embodiment of MOD 10453 “REMOVE TLU COMMAND-MONITORING COMMON POINT”.
The technical content of this Temporary Revision will be incorporated in the next normal revision of the ATR 72 Time Limits Document.
SUMMARY OF CHANGES SECTION 2 - CERTIFICATION MAINTENANCE REQUIREMENTS
LIMITATIONS §1. CMR TABLES updated to introduce the following changes:
▪ CMR REF 272300-3: task revised, interval increased from “4000 FH” to “30000 FH” and applicability changed from “ALL” to “PRE 5948 PRE 10453” ▪ CMR REF 272300-4: task revised; applicability changed from “ALL” to “PRE 10453” ▪ CMR REF 272300-4A: new task added, applicable to PRE 5948 POST 10453 A/C ▪ CMR REF 272300-4B: new task added, applicable to POST 5948 POST 10453 A/C ▪ CMR REF 272300-5: new task added, applicable to PRE 5948 POST 10453 A/C ▪ CMR REF 272300-6: new task added, applicable to POST 5948 POST 10453 A/C
REVISION CODES In text parts, a vertical bold line is added in front of new text, a double vertical line is added for revised or deleted text. Deleted text is removed at current revision.
New text Revised text or Deleted text If a new section is created, no line is added.
When tables for tasks are concerned, revision codes N, R and D are used in addition to revision lines to precise update:
• N: new task created
• R: task revised
• D: task deleted. When the task is deleted, the corresponding line is struck through and removed at next revision of the concerned section.
Only the codes related to the current revision are provided in the document. The codes present in the unchanged sections are removed at the current revision.
When one page is revised in a section, the whole section pages are upgraded at the current revision.
ATR72 TIME LIMITS
Date: July 30th, 2024 Section 2-2 Page: 1 ISSUE: TR 22.1 Printed in France
CERTIFICATION MAINTENANCE REQUIREMENTS
LIMITATIONS
CMR TABLES
MSI CMR REF MSI TITLE AND TASK DESCRIPTION MAX INTERVAL EFFECTIVITY 272300 RUDDER TRAVEL LIMITER UNIT R 272300-3 Operational test of the Travel Limiter Unit 30000 FH PRE 5948 PRE 10453 R 272300-4 Operational test of “T/O” warning with the Travel Limiter Unit in high speed position 10000 FH PRE 10453 N 272300-4A Operational test of “T/O” warning with the Travel Limiter Unit in high speed position 1000 FH PRE 5948 POST 10453 N 272300-4B Operational test of “T/O” warning with the Travel Limiter Unit in high speed position 2000 FH POST 5948 POST 10453 N 272300-5 Operational test of the Travel Limiter Unit monitoring relay 800 FH PRE 5948 POST 10453 N 272300-6 Operational test of the Travel Limiter Unit monitoring relay 1500 FH POST 5948 POST 10453