DEFSTAN 05-123(PT6)/2(2006) : 2006

Introduction
SECTION 0 - GENERAL REQUIREMENTS
1 Scope
2 Warning
3 Normative References
4 Abbreviations
5 Definitions
6 Nomenclature of engines and associated equipment
SECTION 1 - DESIGN CERTIFICATION OF AIRCRAFT ENGINES
7 Introduction
   7.1 Design
   7.2 Qualification Compliance Programme
   7.3 Certificate of design
   7.4 Type approval certificates
   7.5 Certification by a prime contractor
   7.6 Engines certificated to civil requirements
   7.7 Design Records
SECTION 2 - APPROVAL OF ALTERNATIVE METHODS OR SOURCES OF
            MANUFACTURE OF CRITICAL ENGINE PARTS
8 Introduction
   8.1 General
   8.2 Definitions
   8.3 Requirement
   8.4 Testing
   8.5 Recording
SECTION 3 - DESIGN CHANGE APPROVAL AND VALIDATION OF
            MODIFICATIONS
9 Introduction
   9.1 General
   9.2 Testing
SECTION 4 - FLIGHT CLEARANCE OF NON-PRODUCTION STANDARD
            AND PROTOTYPE UNITS
10 Introduction
   10.1 Prototype flight clearance
SECTION 5 - SPECIFICATION PREPARATION
11 Introduction
   11.1 UK designed service engines
   11.2 Military derivatives of civil engines
   11.3 Engines designed under collaborative arrangements
   11.4 Changes in design requirements
   11.5 Exceptions from the engine specification
SECTION 6 - CONTRACTORS MATERIAL AND PROCESS SPECIFICATIONS
12 Preparation
SECTION 7 - MASS AND CENTRE OF GRAVITY DATA OF AIRCRAFT
            ENGINES AND JET PIPES
13 Introduction
   13.1 Terms used in recording mass
   13.2 Items Not Included in Net Dry Mass Estimation
   13.3 Modifications
   13.4 Recording of mass and position of centre of gravity
   13.5 Mass determination and standards for acceptance
         of engines
   13.6 Centre of gravity determination and standards for
         acceptance of engines
   13.7 Mass determination and standards for acceptance of
         jet pipes
   13.8 Centre of gravity determination and standards for
         acceptance of jet pipes
   13.9 Mass determination and standards for acceptance
         of engine change units
   13.10 Centre of gravity determination and standards for
         acceptance of engine change units
SECTION 8 - ENGINE AND JET PIPE MOCK-UPS AND INSTALLATION RIGS
14 Introduction
   14.1 Purpose
   14.2 Computer generated mock-ups
   14.3 Mock-up Stages at the engine contractor
   14.4 Aircraft contractor's requirements
   14.5 Engine change unit mock-up
   14.6 Installation jigs
SECTION 9 - SPECIAL INSTRUCTIONS (TECHNICAL) AND
            ENGINEERING RECORD CARDS
15 Introduction
   15.1 Special instructions (technical)
   15.2 Engineering record cards
SECTION 10 - TECHNICAL DOCUMENTATION FOR ENGINES AND
             ACCESSORIES
16 Introduction
   16.1 MOD IPTL responsibilities
   16.2 Publications contracts
   16.3 Authorisation of work
   16.4 Publications specifications
   16.5 Modification leaflets
SECTION 11 - LOCAL TECHNICAL COMMITTEES FOR ENGINES AND
             ASSOCIATED EQUIPMENT
17 Introduction
   17.1 Scope of committee
SECTION 12 - ALLOTMENT AND MOVEMENT OF ENGINES
18 Introduction
   18.1 Movement between sites
   18.2 Unserviceable or surplus items
SECTION 13 - REPORTING PROCEDURES FOR MOVEMENT AND
             SERVICEABILITY OF ENGINES AND MODULES
19 Introduction
   19.1 Engine management responsibilities
   19.2 Definitions used in reporting
   19.3 Reporting procedures
   19.4 Contractors - special requirements
SECTION 14 - REPAIR/SALVAGE SCHEMES FOR ENGINES AND
             ASSOCIATED EQUIPMENT
20 Introduction
   20.1 General
   20.2 Procedures
   20.3 Financial considerations
   20.4 Lifing considerations
   20.5 Application of schemes prior to approval by
         the Modification Approval Committee
SECTION 15 - PRODUCTION PROCEDURES FOR ENGINES AND
             ASSOCIATED EQUIPMENT
21 Introduction
   21.1 Production release procedure
   21.2 Production release meetings
   21.3 Categories of release to manufacture
   21.4 Category updating and cost control
   21.5 Progression of deliveries
   21.6 Contractual authority
   21.7 Overhaul requirement meetings and repair
         arising meetings
   21.8 Membership and responsibility
   21.9 Monitoring of contractor achievement
   21.10 Provisioning of spares
   21.11 Concessions
   21.12 Relaxation of acceptance testing and strip
         examination
   21.13 Application of quality verification tests
   21.14 Applicability
   21.15 Responsibilities of the Contractor
   21.16 Control of special to contract tools
SECTION 16 - DRAWING PROCEDURE, CONTROL OF DESIGNS
             AND DESIGN RECORDS
22 Introduction
   22.1 Drawing procedure
   22.2 Requirements additional to those of Def Stan 05-10
   22.3 Security marking of drawings
   22.4 Control of designs and design records
SECTION 17 - POST DELIVERY FAULT REPORTING AND INVESTIGATION
23 Introduction
   23.1 Reporting by contractors
   23.2 Routing and authorisation of investigation requests
   23.3 Numbering of authorisations
   23.4 investigation reporting
   23.5 Boards of inquiry
   23.6 Cancellation of authorised investigations
Annex A - Cross Reference of Superseded Def Stan 05-124 Clauses
Annex B - Example of Flight Clearance Note (FCN)
Annex C - Example of FCN Operating Conditions and Limitations
Annex D - Content and Layout of a Receipt/Despatch Message
Annex E - Module Interchangeability Chart
Annex F - Modularity Interchangeability - Modification Index
Annex G - Engine Reject Message
Annex H - Serious Fault Message
Annex I - Completion and Distribution of Form F761A
Annex J - Overhaul/Investigation Report (Rngine/Module) Mod
          Form 761A

Specifies the additional procedures to be used during the design, development, production, in service support and disposal of aircraft engines and their accessories, ground servicing and test equipment.