| Source | Access Method | Cost | Validity | |--------|---------------|------|----------| | ATR Technical Support Portal (MyATR) | Authorized airline/owner login. Request Chapter 80 PDF generator. | Included in maintenance contract | Official | | Boeing/Aviall (ATR distribution partner) | Purchase a subscription to ATR’s digital documentation suite. | ~$500–$2,000/year | Official | | EASA/FAA Type Certificate Data Sheet | Free, but only excerpts, not full manual. | $0 | Reference only | | Third-party vendors (e.g., Aviation Manuals, Inc.) | Resellers of obsolete revisions (pre-2020). | $100–$300 | Unofficial but legal |
Recommendation: If you are a freelance mechanic or a small flight school with an ATR 72-600, contact ATR Customer Support directly at (email: techpubs@atr-aircraft.com) to request a one-time PDF purchase of a specific chapter (ATA 80). ATR offers “Chapter Packs” for around €150–€250.
In the world of regional aviation, few aircraft have achieved the dominance and reliability of the ATR 72-600. This turboprop workhorse is the backbone of short-haul fleets for airlines like FedEx Feeder, Air New Zealand Link, and numerous regional carriers across Europe and Asia. For maintenance engineers, technical planners, and quality assurance managers, one document reigns supreme: the ATR 72-600 Maintenance 80 Manual (2021 PDF) .
This article provides a comprehensive deep dive into what this manual is, why the 2021 revision is critical, how to access legitimate PDF versions, and how to interpret its core components for safe and efficient aircraft operations.
You are looking for the Aircraft Maintenance Manual (AMM) or Instruction for Continued Airworthiness (ICA).
The ATR 72600 maintenance 80 manual PDF 2021 is more than a file—it is a safety-critical tool that evolves with the aircraft. To ensure compliance and safety:
Whether you are a line mechanic at a busy hub or a remote-maintenance engineer in the Arctic, the 2021 ATR 72-600 Maintenance Chapter 80 manual is your definitive guide to safe, reliable engine starts. Secure the correct PDF, study its sections, and always—always—use the current revision.
Disclaimer: This article is for informational purposes only. Always refer to the official ATR 72-600 maintenance documentation and your local aviation authority’s regulations when performing aircraft maintenance.
ATR 72-600 Maintenance Manual 80 PDF 2021: A Comprehensive Guide
The ATR 72-600 is a popular twin-engine turboprop aircraft used for regional and short-haul flights. As with any aircraft, regular maintenance is crucial to ensure safe and efficient operations. In this article, we will provide an overview of the ATR 72-600 maintenance manual, specifically focusing on the 80 PDF 2021 edition.
What is the ATR 72-600 Maintenance Manual?
The ATR 72-600 maintenance manual is a comprehensive guide that outlines the procedures and guidelines for maintaining the aircraft. The manual is published by ATR (Avions de Transport Régional), the manufacturer of the aircraft, and is intended for use by maintenance personnel, engineers, and operators.
What is the significance of the 80 PDF 2021 edition?
The 80 PDF 2021 edition of the ATR 72-600 maintenance manual is a updated version of the manual, which includes revisions and additions to reflect changes in the aircraft's maintenance requirements. The "80" in the edition number refers to the revision level, and "PDF 2021" indicates that the manual is in Portable Document Format (PDF) and was published in 2021.
Key Features of the ATR 72-600 Maintenance Manual 80 PDF 2021
The ATR 72-600 maintenance manual 80 PDF 2021 includes the following key features:
Benefits of Using the ATR 72-600 Maintenance Manual 80 PDF 2021
Using the ATR 72-600 maintenance manual 80 PDF 2021 provides several benefits, including:
Conclusion
The ATR 72-600 maintenance manual 80 PDF 2021 is an essential resource for maintenance personnel, engineers, and operators of the ATR 72-600 aircraft. The manual provides comprehensive guidance on maintenance procedures, technical data, and safety procedures, helping to ensure safe and efficient operations. By using this manual, operators can improve safety, increase efficiency, and comply with regulatory requirements.
In the context of the ATR 72-600 Aircraft Maintenance Manual (AMM), Chapter 80 specifically covers the Starting System. This system is critical for initiating the rotation of the PW127 series engines to their self-sustaining speeds. 🛠️ Key Components of ATR 72-600 Chapter 80
The manual organizes the starting system into several sub-chapters and Job Instruction Cards (JICs) to guide technicians through troubleshooting and component replacement:
Starter/Generator (80-11-00): This is the primary dual-purpose component. During start, it acts as a motor; once the engine is running, it switches to generating electrical power.
Start Controls & Indicators: Includes the overhead panel "START" buttons and the monitoring indicators on the Engine System display page.
Ignition Exciter & Leads: While technically part of the engine system, the manual often cross-references the ignition sequence (which begins at ~10% NH) within the starting procedures. 📋 Maintenance Updates & 2021 Revisions
The 2021 timeframe saw significant updates to the ATR 72-600 technical suite, including the Time Limits Document (TLD) and Maintenance Planning Document (MPD).
Revision 19 (March 2021): This update addressed critical time limits and EASA-approved major changes, ensuring airworthiness standards were met for newer -600 series airframes.
Job Instruction Cards (JIC): Modern ATR manuals are split between "Description & Operation" and "Job Instruction Cards". The 2021 revisions often focused on refining JICs for better clarity during "C-check" heavy maintenance.
Standard Practices (Chapter 20): Manual updates frequently adjust torque values and safety materials used for starter-generator installation, which are essential for preventing "Hot Starts" or system failures. ⚠️ Pro Tip for Technicians
When performing a Starter/Generator removal or inspection, always verify the latest Effectivity (which specific tail numbers the card applies to). Because the -600 utilizes Integrated Modular Avionics (IMA), failure messages for the starting system are often retrieved through the Centralized Maintenance System (CMS) via the MCDU, rather than traditional analog troubleshooting. If you'd like, I can help you find: The troubleshooting steps for a "No Start" condition.
The specific torque values for the starter-generator mounting bolts.
Information on how to access the MCDU maintenance menus for this system. Let me know which specific task you're working on! ATR72 Starting System Overview | PDF - Scribd
Maximizing ATR 72-600 Readiness: A Deep Dive into Chapter 80 Maintenance In the high-stakes world of regional aviation, the ATR 72-600
remains a dominant force, prized for its fuel efficiency and reliability. However, keeping this "workhorse" in the air requires a meticulous adherence to the Aircraft Maintenance Manual (AMM) . For maintenance crews, ATA Chapter 80 (Starting)
is one of the most critical sections, governing the very systems that bring the Pratt & Whitney PW127M turboprop engines to life. The Evolution of Maintenance: The 2021 Update
2021 was a landmark year for ATR maintenance protocols. In December 2021, ATR received EASA approval to extend the intervals for Type C maintenance checks from 5,000 to 8,000 flight hours
—a massive 60% increase. This change, reflected in the September 2021 MRBR (Maintenance Review Board Report), significantly reduces downtime and allows operators to gain up to three additional flying days per year. Troubleshooting ATA 80: The Engine Starting System
The engine starting system on the ATR 72-600 is complex, involving DC power supplies and starter/generators. When things go wrong, maintenance personnel often refer to the Job Instruction Cards (JIC) , which provide step-by-step guidance for servicing and troubleshooting Key focus areas within ATA 80 include:
ATR72 Maintenance Manual Overview | PDF | Tire | Ice - Scribd
Researching Chapter 80 of the ATR 72-600 Aircraft Maintenance Manual (AMM) reveals it covers the Engine Starting System . According to the ATR Systems Guide , this chapter is critical for the two Pratt & Whitney Canada PW127M engines used on this aircraft. University of Benghazi
Below is a structured "paper" summarizing the technical maintenance framework for this system as of the 2021 revision cycle.
Paper: Maintenance Framework of the ATR 72-600 Engine Starting (ATA 80) 1. Introduction and System Scope
Chapter 80 of the AMM describes the electrical starting system used to rotate the engine's high-pressure (HP) spool until it reaching a self-sustaining speed. Unlike older versions, the -600 series utilizes a more integrated Electronic Control Unit (ECU)
to manage the start sequence, ensuring optimized fuel flow and temperature monitoring to prevent "hot starts". University of Benghazi 2. Technical Components and Operation atr 72600 maintenance 80 manual pdf 2021
The starting system is primarily DC-powered. Maintenance tasks often focus on the following key units: Starter-Generator:
A dual-purpose unit that provides initial rotation and then transitions into a 28V DC power source once the engine is running. Start Selector & Button:
Physical cockpit controls that interface with the aircraft's logic to initiate the sequence. Ignition Exciter Boxes:
Provide the high-voltage spark for fuel combustion during the start cycle. 3. Key Maintenance Procedures (AMM Chapter 80-11) Scribd's AMM Introduction , standard job cards for this system include: Operational Tests:
Regular verification of the "Hotel Mode" start (where engine #2 runs while the propeller is braked to provide power and AC on the ground). Motoring Cycles:
Procedures to rotate the engine without ignition, typically used for cooling or fuel system purging. Troubleshooting:
Common fault isolation for "Start Aborts" or "No-Start" conditions, often requiring a reset of the electrical system. 4. 2021 Maintenance Planning (MPD) Updates In late 2021, the ATR Maintenance Planning Document (MPD)
underwent a significant revision (Rev 28/34). Key updates included: portail-navigabilite.online Maintenance Planning Document- ATR 72-212 A Rev 34
The official documentation for the ATR 72-600, including the Aircraft Maintenance Manual (AMM), is primarily accessed through the ATRactive Customer Portal, which provides 24/7 digital support for global operators.
Regarding your specific search for the "MS80" manual from 2021:
Maintenance Planning Document (MPD): A standard revision for the ATR 72 series (Revision 34) was released in February 2022, which incorporated the September 2021 Maintenance Review Board Report (MRBR) updates.
ATA Chapter 80: In aviation technical manuals, Chapter 80 typically refers to Starting Systems.
Accessing PDFs: Technical publications like the AMM, Illustrated Part Catalog (IPC), and Wiring Diagram Manual (WDM) are managed via the ATR N@V system. While older revision summaries or training handbooks sometimes appear on public hosting sites like Scribd, these are often marked as "For Training Purposes Only" and may not be current. Official Channels for Technical Data
For authorized personnel needing the 2021 revision of maintenance manuals, you should utilize the following resources:
Tech Pub Services: You can request technical data download options by contacting TECHPUB.SERVICES@atr-aircraft.com.
ATRactive Portal: The ATRactive portal allows for specific document requests via the "Request ATR" feature.
Training Resources: General maintenance training catalogs and document overviews are available on the ATR Aircraft Documents Page.
Notice: Carrying out any maintenance task using unofficial PDF versions found on public sites is strictly prohibited; always refer to the latest documentation on the official AirN@V platform. Manual Atr 72-600 Rev 3.0 | PDF | Flight Attendant - Scribd
Direct links to official or current ATR 72-600 Aircraft Maintenance Manuals (AMM) from 2021 are generally restricted to authorized operators and maintenance organizations via the ATR Active Customer Portal. However, specific technical documentation and revision summaries from that period are available through professional aviation archives. Available ATR 72-600 Maintenance Documentation
Current documentation for the ATR 72-600 (212A variant) often includes the following components:
Maintenance Planning Document (MPD): A critical document that outlines the scheduled maintenance program. For example, a version from February 2022 (Revision 34) includes updates based on the Maintenance Review Board Report (MRBR) revision from September 2021.
Aircraft Maintenance Manual (AMM) Introduction: Detailed overview of how to use the manual, including job instruction cards (JIC), task code designations, and revision policies.
Troubleshooting & Systems Guides: Manuals such as the ATR 72 Troubleshooting Guide for engine issues and Weight and Balance Manuals are used alongside the AMM for specific operations.
Maintenance Training: ATR provides specialized Maintenance Training Services to familiarize technicians with the MSG-3 logic used in these manuals. Typical Maintenance Schedule Maintenance for the ATR 72-600 follows a structured cycle:
A Check: Performed approximately every 400–600 flight hours.
C Check: More extensive inspections, with recent revisions in 2021/2022 reflecting "C-check evolution" for optimized aircraft availability.
D Check: The most intensive "heavy maintenance" occurring every six to ten years.
00 Introduction ATR 72 600 | PDF | Flight Control Surfaces - Scribd
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Title: ATR 72600 Maintenance — 80% Manual (PDF) — 2021
Body: Looking for the ATR 72600 maintenance 80 manual PDF (2021)? This post provides quick guidance to help you find the official maintenance documentation for the ATR 72600 series.
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The Ultimate Guide to ATR 72600 Maintenance: A Comprehensive Overview
The ATR 72600 is a high-performance turboprop engine used in various aircraft applications. To ensure optimal performance, reliability, and safety, regular maintenance is crucial. In this article, we will provide an in-depth look at the ATR 72600 maintenance requirements, with a focus on the 80-hour manual inspection, and explore the 2021 updates.
Introduction to ATR 72600 Maintenance
The ATR 72600 engine is designed to provide exceptional performance, efficiency, and reliability. However, like any complex machinery, it requires regular maintenance to ensure continued operation. The manufacturer, Pratt & Whitney Canada (PWC), recommends a comprehensive maintenance program to prevent wear and tear, detect potential issues early, and minimize downtime.
Maintenance Requirements
The ATR 72600 maintenance program is divided into several categories, including:
80-Hour Manual Inspection
The 80-hour manual inspection is a critical maintenance task that must be performed on the ATR 72600 engine. This inspection is designed to detect potential issues early, ensuring the engine continues to operate safely and efficiently. The 80-hour inspection involves a detailed visual examination of the engine, including:
2021 Updates: ATR 72600 Maintenance 80 Manual PDF
In 2021, the manufacturer released an updated version of the ATR 72600 maintenance manual, which includes revised procedures and guidelines for the 80-hour inspection. The updated manual is available in PDF format and provides detailed instructions, illustrations, and specifications for performing the inspection. | Source | Access Method | Cost |
The updated manual includes the following changes:
Benefits of Regular Maintenance
Regular maintenance, including the 80-hour manual inspection, provides several benefits, including:
Best Practices for ATR 72600 Maintenance
To ensure optimal performance and reliability, follow these best practices:
Conclusion
The ATR 72600 maintenance program is designed to ensure optimal performance, reliability, and safety. Regular maintenance, including the 80-hour manual inspection, is crucial to detecting potential issues early and minimizing downtime. By following the manufacturer's recommendations, using qualified personnel, keeping accurate records, and staying up-to-date with updates and revisions, operators can ensure their ATR 72600 engine continues to operate safely and efficiently.
Downloads:
References:
The ATR 72-600 is a sophisticated turboprop aircraft that requires precise adherence to manufacturer guidelines to ensure operational safety and longevity. For maintenance professionals, the ATR 72-600 Maintenance 80 Manual (ATA Chapter 80) is the definitive resource for starting and cranking systems. 🛠️ Understanding ATA Chapter 80: Starting Systems
The "80" in your search refers to the ATA Chapter 80 classification. This specific section of the Aircraft Maintenance Manual (AMM) focuses on the components and procedures required to start the engines. Key Components Covered
DC Starter-Generator: The primary unit that cranks the engine.
Start Control Unit (SCU): The logic center for sequence management. Ignition Exciters: Providing the spark for combustion.
Propeller Brake: Crucial for "Hotel Mode" operations (running the right engine to provide power without turning the prop). 📖 What the 2021 PDF Manual Includes
A standard 2021 revision of the ATR 72-600 Maintenance Manual for Chapter 80 typically includes: 1. Fault Isolation (Troubleshooting) The manual provides logic trees for common issues, such as: Engine failing to rotate during start sequence. Hot starts or hung starts.
Starter-Generator failing to switch to "Generator" mode after reaching 45% NH. 2. Removal and Installation
Step-by-step instructions for replacing hardware. This includes torque values, gasket specifications, and safety wire requirements. 3. Functional Tests
Detailed "Return to Service" tests. These ensure that after a component is replaced, the system communicates correctly with the CAC (Centralized Advisory System) and the cockpit displays. ⚠️ Important Regulatory Warning
While searching for a PDF version of the 2021 manual is common for study or reference, active maintenance must always be performed using the current, live revision.
ATR Active Documentation: ATR utilizes the ATR Active Doc portal.
Revision Status: Manuals are updated frequently (Temporary Revisions or TRs). Using a static 2021 PDF for actual aircraft work may lead to non-compliance or safety risks if a Service Bulletin (SB) has since changed a procedure. 🔧 Maintenance Tips for the ATR 72-600
Monitor Engine Health (ECU): The -600 series features advanced Engine Control Units. Always download and analyze data if a start fault is logged.
Battery Voltage: Ensure batteries are at a minimum of 23V-24V before attempting a battery start to prevent "Low Voltage" aborts.
Hotel Mode Caution: When maintaining the starting system for Hotel Mode, pay extra attention to the propeller brake pressure sensors. 📥 How to Access Official Manuals
To obtain the most accurate and legal version of the ATR 72-600 Maintenance Manual, follow these steps:
Operator Portal: Log in to the official ATR Customer Portal.
Tech Pubs Subscription: Ensure your organization has an active subscription to the AMM (Aircraft Maintenance Manual) and TSM (Troubleshooting Manual).
IETP: Most modern ATR maintenance is done via IETP (Interactive Electronic Technical Publications) software rather than standard PDFs for better navigation. If you'd like to continue, let me know:
Do you need a list of required tools for a starter-generator change?
Are you studying for your B1/B2 license and need a summary of system logic?
I can provide technical summaries or step-by-step guides for your specific task.
A review of the ATR 72-600 Maintenance Manual (Revision 80, 2021) focuses on its effectiveness as a technical resource for certifying staff and planners. While "Revision 80" typically refers to the Maintenance Planning Document (MPD) or specific Aircraft Maintenance Manual (AMM) updates from that year, the following review highlights the core strengths and critical updates of the 2021 technical documentation. Review: ATR 72-600 Maintenance Documentation (2021 Updates) Overall Rating: ⭐⭐⭐⭐ (4/5) 1. Structure & Accessibility
The 2021 manual continues the transition toward a highly digitalized format, primarily accessed via the ATRnavX platform. The document is split logically into two main parts:
Description and Operation Manual: Technical content covering aircraft systems.
Job Instruction Card (JIC) Manual: Detailed, step-by-step procedures for scheduled maintenance tasks. 2. Key Technical Updates in 2021
The 2021 revisions introduced critical safety and operational updates, including:
Weight Increases: Documentation for ATR MOD 7979 allowing weight increases for operations on unpaved runways.
System Upgrades: Inclusion of new standards for Halon-free fire extinguishers and standby altimeter pressure unit changes.
Maintenance Planning: Integration of the new MRBR Revision 28 (September 2021), which optimized C-check intervals and maintenance task groupings based on operator feedback. 3. User Experience for Technicians
Scannability: The use of MSG-3 logic makes the manual highly predictable for experienced engineers.
Precision: Measurement values are provided in both metric and non-metric systems, reducing the risk of conversion errors during torque applications or fluid servicing.
Clarity: Modern revisions include improved diagrams for landing gear inspections, "no-step" areas, and grounding locations. 4. Critical Considerations
Effectivity: Users must pay close attention to the Effectivity codes on each page, as the ATR 72-600 has various modifications (e.g., Glass Cockpit vs. standard instruments) that change specific task requirements. You are looking for the Aircraft Maintenance Manual
Legal Compliance: The manual emphasizes that it must be used alongside the latest Time Limits Document (TLD) to ensure airworthiness compliance. Summary
The 2021 Revision 80 remains a cornerstone for regional airlines. It successfully balances complex engineering data with the practical needs of line maintenance. For planners, the inclusion of Excel-based task revision details in 2021 was a significant leap forward for importing data into Maintenance Management Systems.
Job Instruction Cards (JIC) for specific systems (e.g., engines or landing gear) Maintenance Planning Document (MPD) task intervals Troubleshooting procedures for the 72-600 glass cockpit Maintenance Planning Document- ATR 72-212 A Rev 34
To find the specific document you're looking for, here are some steps you can take:
When searching, ensure you're using accurate and specific keywords related to your needs, such as "ATR 72-600 maintenance manual issue 80" or including the specific document number if you have it.
If you're part of an aviation organization or a professional in the field, your access to these documents might be restricted or regulated, so ensure you're using authorized channels to obtain such manuals.
What "ATR 72600" likely refers to:
Suggested steps to find the manual:
Aviation maintenance databases:
Correct your search:
Contact:
Note: Maintenance manuals for in-production aircraft like ATR are copyrighted and restricted to authorized operators. They aren't legally available for free public download.
If you can confirm the exact model (ATR 42/72 and dash number), I can offer more targeted guidance.
As of late 2021, maintenance requirements for the ATR 72-600 underwent significant updates, particularly regarding the extension of check intervals to improve operational economics. The primary technical document governing these tasks is the Maintenance Planning Document (MPD), which integrates guidelines from the Maintenance Review Board Report (MRBR) and the Time Limits Document (TLD). Key Maintenance Manual Revisions (2021)
In September 2021, ATR released the MRBR Normal Revision 28, which served as the foundation for subsequent MPD updates.
Interval Extensions: One of the most notable changes in late 2021 was EASA’s approval to extend Type C maintenance check intervals from 5,000 to 8,000 flight hours.
A-Check Escalation: Earlier approvals had already extended Type A checks from 500 to 750 flight hours.
New Powerplant Integration: The introduction of the PW127XT engine series in November 2021 significantly reduced maintenance demands, offering a 40% extension in time on wing (up to 20,000 hours). Structure of ATR 72-600 Maintenance Documentation
The aircraft’s maintenance manual is organized according to ATA Specification 100 standards, typically divided into the following core sections: Maintenance Planning Document- ATR 72-212 A Rev 34
Introduction
The ATR 72-600 is a twin-engine, turboprop airliner that is widely used for regional and short-haul flights. The aircraft is known for its reliability, efficiency, and comfort. To ensure the continued safe operation of the ATR 72-600, regular maintenance is essential. This report provides an overview of the maintenance requirements for the ATR 72-600, specifically focusing on the 80-hour maintenance manual.
Maintenance Overview
The ATR 72-600 has a comprehensive maintenance program that is designed to ensure the aircraft remains airworthy and meets the regulatory requirements of the Federal Aviation Administration (FAA) and the European Aviation Safety Agency (EASA). The maintenance program includes a range of activities, such as:
80-Hour Maintenance Manual
The 80-hour maintenance manual is a critical document that outlines the specific maintenance tasks and inspections required for the ATR 72-600 at the 80-hour interval. This manual is typically published by the manufacturer, ATR, and is used by maintenance personnel to guide their work.
The 80-hour maintenance manual covers the following topics:
Maintenance Tasks
The 80-hour maintenance manual outlines a range of specific tasks that must be performed, including:
Importance of Maintenance
The maintenance of the ATR 72-600 is critical to ensuring the safety of passengers, crew, and the general public. Failure to perform required maintenance can lead to:
Conclusion
The ATR 72-600 maintenance 80 manual is a critical document that outlines the specific maintenance tasks and inspections required for the aircraft at the 80-hour interval. Regular maintenance is essential to ensuring the continued safe operation of the aircraft and compliance with regulatory requirements. Maintenance personnel must carefully follow the guidelines outlined in the manual to ensure that all necessary tasks are performed.
Recommendations
References
By following the guidelines outlined in this report, operators and maintenance personnel can ensure that the ATR 72-600 is properly maintained, and safe for continued operation.
To provide a detailed report on the ATR 72-600 Maintenance Planning Document (MPD) and related manuals for 2021, it is essential to understand the structure of ATR's technical publications. The "80" in your request typically refers to Chapter 80 of the Air Transport Association (ATA) coding system, which covers Starting systems. 2021 Maintenance Document Status
Maintenance for the ATR 72-600 is governed by several core documents that were updated throughout 2021 to include new safety standards and operational feedback:
Maintenance Planning Document (MPD): The primary guide for scheduled maintenance. In late 2021 and early 2022, major revisions (such as Rev 34) were released to align with the Maintenance Steering Group 3 (MSG-3) principles.
Time Limits Document (TLD): Revision 19 was issued in March 2021, with subsequent approvals in July and September 2021. This document defines the life limits of critical components.
Maintenance Review Board Report (MRBR): A significant update (Revision 28) was released in September 2021, which forms the basis for the tasks found in the MPD. Chapter 80: Starting System Maintenance
In the ATR 72-600 Aircraft Maintenance Manual (AMM), Chapter 80 provides detailed Job Instruction Cards (JICs) for the engine starting system.
Purpose: Outlines procedures for the pneumatic and electrical components that start the PW127M engines.
Key Tasks: Includes operational tests of the start valve, inspection of the starter-generator, and troubleshooting the auto-start sequence managed by the Integrated Modular Avionics (IMA).
Documentation Access: Official technical publications are managed via the ATR Active Portal. Maintenance Intervals & Structure
The maintenance program is divided into three main categories: Maintenance Planning Document- ATR 72-212 A Rev 34