SAE ARP 6028A-2020

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For more information on this standard, visit

https://www.sae.org/standards/content/ARP6028A/

AEROSPACE

RECOMMENDED PRACTICE

ARP6028™

REV. A

Issued 2009-03

Revised 2015-08

Reaffirmed 2020-10

Superseding ARP6028

(R) Configuration Control for Maintaining Correlation of

Gas Turbine Engine Test Cells

RATIONALE

Revision A has been compiled to remove all dates and suffixes from reference documents to comply with SAE policy and

to add a statement on the general “day to day” management of Configuration Control.

TABLE OF CONTENTS

1. SCOPE .......................................................................................................................................................... 2

1.1 Purpose ......................................................................................................................................................... 2

2. REFERENCES .............................................................................................................................................. 2

2.1 Applicable Documents .................................................................................................................................. 2

2.1.1 SAE Publications ........................................................................................................................................... 2

2.1.2 FAA Publications ........................................................................................................................................... 2

2.2 Definitions ..................................................................................................................................................... 3

3. METHODS OF RECORDING, DOCUMENTING AND MAINTAINING INFORMATION .............................. 3

4. INFORMATION REQUIRED TO BE RECORDED ....................................................................................... 4

4.1 General Design Description and Local Environment Conditions (External) ................................................. 4

4.2 Intake System Design Description ................................................................................................................ 5

4.3 Test Cell Design Description (Internal) ......................................................................................................... 5

4.4 Test Cell Main Equipment Description .......................................................................................................... 5

4.5 Test Cell "Slave" and Auxiliary Testing Equipment Description ................................................................... 5

4.6 Exhaust System Design Description ............................................................................................................. 6

4.7 Measurement System Description ................................................................................................................ 6

4.8 Instrumentation Description .......................................................................................................................... 6

4.9 Instrument Calibration Description and Record Retention ............................................................................ 6

4.10 Control System Influences ............................................................................................................................ 6

4.11 Performance Analysis and Pass-Off Program Software ............................................................................... 6

5. BEST PRACTICE METHODS TO MONITOR AND MAINTAIN "CONFIGURATION CONTROL" ............... 7

6. SUBJECT MATTER EXPERT (SME) JUDGEMENT TO DETERMINE CONTINUED

CORRELATION/CALIBRATION VALIDITY .................................................................................................. 7

7. NOTES .......................................................................................................................................................... 8

7.1 Revision Indicator .......................................................................................................................................... 8

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SAE INTERNATIONAL ARP6028A Page 2 of 8

1. SCOPE

1.1 Purpose

The FAA has issued Advisory Circular, AC43-207, that recommends re-correlation, trending or period checks. The FAA,

AC43-207 bases their recommendation on ARP741.

This paper describes a recommended practice and procedure for the configuration control requirements to maintain test

cell correlation status. This is necessary to maintain performance measurement integrity, particularly when correlation

approval is achieved by statistical trending.

The configuration of a test facility that exists at the time when a correlation is being carried out should be "base lined" as a

condition of correlation approval acceptance, and, be maintained during the time period that the respective correlation

approval lasts. This defines test facility configuration control.

This is due to the fact that a change in configuration may have the potential to change the established correlation factors

and measured engine performance. If such a change occurs then this should be judged by the respective OEMs or

designated correlation approval authorities Subject Matter Expert (SME). In some cases, this may involve consultation

with the engine project customer or airworthiness authorities.

The purpose of this paper is to recommend a means of identifying, recording, documenting and maintaining the

configuration status of all correlations, including those where re-approval is achieved by using statistical trending methods

rather than physical back-to-back type testing.

This paper can be considered applicable to all types and standards of test facilities in the aero, marine and industrial gas

turbine engine businesses.

2. REFERENCES

2.1 Applicable Documents

The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications

shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase order. In the

event of conflict between the text of this document and references cited herein, the text of this document takes

precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption

has been obtained.

2.1.1 SAE Publications

Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA

and Canada) or +1 724-776-4970 (outside USA), www.sae.org.

ARP741 Turbofan and Turbojet Gas Turbine Engine Test Cell Correlation

ARP4755 Turboshaft/Turboprop Gas Turbine Engine Test Cell Correlation

ARP5435 APU Gas Turbine Engine Test Cell Correlation

2.1.2 FAA Publications

Available from Federal Aviation Administration, 800 Independence Avenue, SW, Washington, DC 20591, Tel: 866-835-

5322, www.faa.gov.

Federal Aviation Administration Advisory Circular, AC43-207

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SAE INTERNATIONAL ARP6028A Page 3 of 8

2.2 Definitions

CALIBRATION: The comparison of a particular instrument or system with a standard of known accuracy.

CORRELATION: The comparison of engine performance parameters measured on a common engine tested in two test

facilities, where one facility is the reference.

CORRELATION FACTOR: A multiplier used where appropriate to adjust for the difference in performance between the

customer facility and a reference facility, also known as a “correction factor” or a “facility modifier.”

TEST FACILITY (TEST CELL): An area in which a gas turbine engine is operated to determine its performance and other

information as required by a given test. This description can also be known as the Test Bed, Test Plant, Test Stand, Test

Bench, etc.

TRENDING: The statistical practice of recording and plotting parameters over time.

FAA: Federal Aviation Administration

OEM: Original Equipment Manufacturer of respective gas turbine engine.

SME: Subject Matter Expert(s) designated and qualified to make judgement on configuration control compliance issues.

RFI: Radio Frequency Interference

EMI: Electromagnetic Interference

FOD: Foreign Object Damage (to engine)

3. METHODS OF RECORDING, DOCUMENTING, AND MAINTAINING INFORMATION

It should be emphasized that configuration control can be split into three elements:

a. Local basic visual check (as specified) of any fundamental requirements prior to all engine performance testing. This

could include a simple check of any moveable/variable items such as exhaust systems, intakes, cranes, etc. Typically

this could be a local check list posted on the test control room wall.

b. The management of day-to-day change control that reviews any changes that will require judgement and sentencing

by an SME and thus records any changes to the declared configuration, such that the main record can be updated

periodically, as required. Typically this can be carried out on a local spread sheet.

c. The full main overall declared configuration status to accompany any correlation approvals. This document should

also reference any change control records above as an audit trail.

It is preferred that the main overall configuration status is contained in a single and separate report/document that is

related and referenced to an associated correlation report, to aid clarity. Alternatively, the information could reside in a

section of the correlation report or in a format that has been agreed with the respective OEMs or designated correlation

approval authorities SME. This degree of flexibility is likely to increase successful implementation and compliance.

Separate reports/documentation should be compiled for differing engine types on the same test facility.

In the event of a correlation re-approval where there is no change to the configuration status, a simple statement of "no

change" can be issued, either as an independent document, an issue update of the existing configuration report/document

or a statement contained within the correlation report.

The following methods can be used to record, document, and maintain the required information and include:

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摘要：

SAE ARP 6028A-2020 是由国际自动机工程师学会（SAE International）发布的一项航空航天标准规范，全称为“航空器机轮与刹车维护、修理与大修（MRO）指南”。该标准旨在为航空器着陆系统（尤其是指机轮组件）的维护、修理和大修提供统一的工程实践与技术要求，涵盖无损检测、组装规范、液压动力单元检查、旋转部件寿命管理及返厂修理流程等关键环节。2020年发布的A版本在原标准基础上更新了材料与工艺指南，强化了对疲劳裂纹、腐蚀及过热损伤的检测程序，并增加了对新型复合材料和钛合金组件

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