ASTM F3476-21

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F3476 − 21
Standard Guide for
Airframe and Systems Aviation Maintenance Personnel
This standard is issued under the fixed designation F3476; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
1.1 The purpose of this guide primarily is to address the 2.1 ASTM Standards:
fundamental subject knowledge, task performance, and task F3060 Terminology for Aircraft
knowledge activities labeled “Airframe and Systems,” which F3376 Guide for Core Competencies for Aviation Mainte-
ensures the Aircraft Maintenance Technician (AMT)/Aircraft nance Personnel
MaintenanceEngineer(AME)havethenecessarybasicknowl- 2.2 Advisory Document:
edge and skills for today’s global aviation maintenance envi- 14 CFR Part 1 Definitions and Abbreviations
ronment. Thus, the ASTM F46 Aerospace Personnel Commit-
3. Terminology
tee has developed academic and skills knowledge standards
that have been developed by aerospace industry-lead working
3.1 Definitions—See 14 CFR Part 1, Definitions andAbbre-
groups. These standards reflect industry best practices and viations.
provide a focus on levels of safety that may exceed current
3.2 Definitions—See ASTM F3060, Standard Terminology
regulatory guidance for aircraft maintenance technician aca-
for Aircraft.
demic and skills standards. This guide may supplement a
3.3 Acronyms and Abbreviations:
state’s basic general requirements forAMT/AME certification.
3.3.1 ADF—automatic direction finder
It is not the intent of this guide to replace the AMT
requirements, but to ensure the AMT/AME is trained to the 3.3.2 APU—auxiliary power unit
level as indicated. It is recommended that ASTM F3376,
3.3.3 BITE—built-in test equipment
Standard Guide for Core Competencies for Aviation Mainte-
3.3.4 DME—distance measuring equipment
nance Personnel, be used as a prerequisite for this guide. This
3.3.5 ELT—emergency locator transmitter
guide may be used as a basis for an approval when specifically
identified as such by the appropriate governing authority. 3.3.6 ICA—instructions for continued airworthiness
1.2 This standard does not purport to address all of the
3.3.7 ILS—instrument landing system
safety concerns, if any, associated with its use. It is the
3.3.8 MSG3—maintenance steering group, 3rd generation
responsibility of the user of this standard to establish appro-
3.3.9 PMA—parts manufacturing approval
priate safety, health, and environmental practices and deter-
3.3.10 RVSM—reduced vertical separation minimum
mine the applicability of regulatory limitations prior to use.
1.3 This international standard was developed in accor-
3.3.11 STC—supplemental type certificate
dance with internationally recognized principles on standard-
3.3.12 TCAS—traffic alert collision avoidance system
ization established in the Decision on Principles for the
3.3.13 TSO—technical standard order
Development of International Standards, Guides and Recom-
3.3.14 VHF—very high frequency
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
3.3.15 VOR—VHF omni-directional ranging
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
This guide is under the jurisdiction of ASTM Committee F46 on Aerospace contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Personnel and is the direct responsibility of Subcommittee F46.03 on Airframe and Standards volume information, refer to the standard’s Document Summary page on
Systems Endorsements. the ASTM website.
Current edition approved Oct. 15, 2021. Published November 2021. DOI: Available from Federal Aviation Administration (FAA), 800 Independence
10.1520/F3476-21. Ave., SW, Washington, DC 20591, http://www.faa.gov.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F3476 − 21
3.4 See Table 1 for explanations for task knowledge and 5.3.1 Classification of structures (primary, secondary, and
subject knowledge levels. tertiary).
5.3.2 Inspections using borescope and remote electronic
4. Significance and Use
methods.
4.1 This industry developed standard is to be used in
5.4 Airworthiness Definition and Application – LEVEL
conjunction with AMT/AME curriculum programs to help
2—Understands and can apply the theory related to the
ensure enhanced knowledge and skill levels for the mainte-
following:
nance technician/engineer in today’s ever-changing and highly
5.4.1 Airframe conformity inspection.
technical aviation environment.
5.4.2 Special inspections (heavy landing, lightning strikes).
4.2 Task requirements are divided by Air Transport Asso-
5.4.3 Airworthiness requirements.
ciation of America (ATA) category and listed in ATA order.
5.5 (ATA 6) Dimensions and Areas – LEVEL
4.3 If a task is only listed as Level 3, it is understood the
1—Understands and can describe the following:
task will require knowledge at Level 1 and Level 2 as well.
5.5.1 Aircraft Dimensions (wingspan, length, height, mea-
4.4 Advanced, specific, or specialized knowledge standards
surement references).
may be developed in future endorsements. Aircraft model
5.5.2 Areas and Zones.
specific courses and aircraft painting are examples of endorse-
5.6 (ATA 7) Lifting and Shoring – LEVEL 1—Understands
ment areas.
and can describe the following:
5. Knowledge and Task Requirements
5.6.1 Sling or trestle major component.
5.1 See Table 1 for detailed explanations of Levels 1, 2, and
5.7 Lifting and Shoring – LEVEL 3—Can describe in detail
3.
and perform tasks related to the following:
5.2 (ATA 5) Aircraft Inspection and Conformity – LEVEL 5.7.1 Aircraft jacking.
1—Understands and can describe the following:
5.8 (ATA 8) Leveling and Weighing – LEVEL
5.2.1 Certification categories (type certification, production
2—Understands and can apply the theory related to the
certification, airworthiness certification).
following:
5.2.2 Products and parts, Supplemental Type Certificate
5.8.1 Configuration of aircraft against equipment list.
(STC), Parts ManufacturingApproval (PMA), Technical Stan-
5.8.2 Preparation, leveling, and weighing aircraft.
dard Order (TSO).
5.2.3 Time limited maintenance, Maintenance Steering 5.9 (ATA 12) Servicing - Routine Maintenance – LEVEL
Group, 3rd Generation (MSG3), Instructions for Continued
1—Understands and can describe the following:
Airworthiness (ICA), airworthiness limitations.
5.9.1 Fueling and defueling.
5.9.2 Tire pressure checks.
5.3 Airworthiness Requirements for Structural Strength –
LEVEL 2—Understands and can apply the theory related to the 5.9.3 Servicing of oil, hydraulic fluid, accumulators, and
following: pneumatic systems.
TABLE 1 Knowledge and Task Levels
LEVEL 1 A familiarization with the principal elements of the subject.
Objectives:
 The student should be familiar with the basic elements of the subject.
 The student should be able to give a simple description of the entire subject.
 The student should be able to locate methods, procedures, instructions, and reference material.
 The student should be able to use typical terms.
 No skill demonstration is required under this level.
LEVEL 2 A general knowledge of the theoretical and practical aspects of the subject, and an ability to apply that knowledge in a practical manner.
Objectives:
 The student should be able to find and interpret maintenance data and information.
 The student should be able to give a general description of the subject using, as appropriate, typical examples.
 The student should be able to use mathematical formulae in conjunction with physical laws describing the subject.
 The student should be able to read and understand sketches, drawings, and schematics describing the subject.
 A high level of skill is not required.
LEVEL 3 A detailed knowledge of theoretical and practical aspects of the subject. To know, understand, and apply facts, principles, theories, and
concepts.
Objectives:
 The student should be able to give a detailed description of the subject using theoretical fundamentals and specific examples.
 The student should be able to apply their knowledge in a practical manner using manufacturer’s or other acceptable data.
 The student should be able to interpret results from various sources and measurements and apply corrective action where appropriate.
 Perform all skill operations to a return-to-service standard using appropriate data, tools, and equipment.
 The student should be able to perform inspections in accordance with acceptable or approved data.
 A high level of skill is required.
F3476 − 21
5.9.4 Servicing grease-fitted components and other areas 5.14 (ATA 22) Autoflight System:
that require grease.
5.14.1 Autoflight System Theory of Operation – LEVEL
5.9.5 Use of ground power.
1—Understands and can describe the following:
5.9.6 Servicing water and toilet systems.
5.14.1.1 Autoflight systems including auto-throttle and
5.9.7 Verification of fluid levels during preflight checks.
auto-brake systems.
5.14.2 Autoflight System Maintenance – LEVEL 3—Can
5.10 (ATA 20) Standard Practices (Basic) – LEVEL
describe in detail and perform tasks related to the following:
1—Understands and can describe the following:
5.14.2.1 Inspection, testing, and troubleshooting of
5.10.1 Soldering, brazing, and welding techniques using
autopilot, servos, and approach coupling systems.
Oxy-Acetylene gas, Shield Metal Arc (SMAW), Metal Inert
Gas (MIG), and Tungsten Inert Gas (TIG).
5.15 (ATA 23) Communication Systems:
5.10.2 Identification and use of digital databus systems.
5.15.1 Communication Systems Theory of Operation –
5.11 Standard Practices (Intermediate) – LEVEL
LEVEL 1—Understands and can describe the following:
2—Understands and can apply the theory related to the
5.15.1.1 Communication Systems including High Fre-
following:
quency (HF), Very High Frequency (VHF), Satellite Commu-
5.11.1 Identification of pipes and unions.
nication (SATCOM), PassengerAddress (PA), and Interphone/
5.11.2 Soldering of stainless steel and copper/bronze mate-
Intercom.
rials.
5.15.1.2 Emergency Locator Transmitter (ELT) awareness
5.11.3 Fabrication of tubular structures.
to prevent false activation.
5.11.4 Inspection of aluminum, steel, and stainless steel
5.15.2 Communication Systems Maintenance – LEVEL
welds.
3—Can describe in detail and perform tasks related to the
5.11.5 Inspection of magnesium and titanium welds.
following:
5.11.6 Understand fail safe, life limits, and damage toler-
5.15.2.1 Inspection, testing, troubleshooting, and repair of
ance concepts.
communication systems and antennas.
5.11.7 Inspection and repair of aircraft electrical system
5.16 (ATA 24) Electrical Power System:
components (crimp and splice wiring to manufacturer’s
5.16.1 Electrical Power System Theory of Operation –
specifications, repair of pins and sockets of aircraft connec-
LEVEL 1—Understands and can describe the following:
tors).
5.16.1.1 DC power generation.
5.11.8 Inspection and testing of proximity switches and
5.16.1.2 AC power generation.
printed circuit boards.
5.11.9 Understand and use of Built-In Test Equipment 5.16.1.3 Emergency power generation.
(BITE). 5.16.1.4 Voltage regulation.
5.16.1.5 Power distribution.
5.12 Standard Practices (Advanced) – LEVEL 3—Can de-
5.16.1.6 Inverters, transformers, and rectifiers.
scribe in detail and perform tasks related to the following:
5.16.1.7 Circuit protection.
5.12.1 Torque applications.
5.12.2 Installation, testing, and servicing of airframe elec- 5.16.1.8 External power and ground power.
trical wiring, controls, switches, indicators, and protective
5.16.2 Electrical Power System Maintenance – LEVEL
devices.
3—Can describe in detail and perform tasks related to the
following:
5.13 (ATA21)AirConditioningandPressurizationSystems:
5.16.2.1 Inspection, testing, troubleshooting, servicing, and
5.13.1 Air Conditioning and Pressurization Systems Theory
repair of alternating and direct-current electrical systems.
of Operation – LEVEL 1—Understands and can describe the
5.16.2.2 Inspection, testing, and troubleshooting of constant
following:
speed and integrated drive generators.
5.13.1.1 Air conditioning and air conditioning systems.
5.16.2.3 Inspection, installation, and servicing of aircraft
5.13.1.2 Air cycle and vapor cycle machines.
batteries (all types).
5.13.1.3 Air distribution systems.
5.13.1.4 Air flow, temperature, and humidity control sys-
5.17 (ATA 25) Equipment and Furnishings:
tems.
5.17.1 Equipment and Furnishings General Knowledge –
5.13.1.5 Pressurization and pressurization systems.
LEVEL 1—Understands and can describe the following:
5.13.1.6 Control and indication systems, including outflow
5.17.1.1 Identification of interior burn certification require-
control and safety valves.
ments.
5.13.1.7 Cabin pressure controllers.
5.17.1.2 Cabin lay-out.
5.13.1.8 Safety and warning devices.
5.17.1.3 Cabin equipment lay-out.
5.13.2 Air Conditioning and Pressurization Systems Main-
5.17.1.4 Cabin furnishings installation.
tenance – LEVEL 3—Can describe in detail and perform tasks
5.17.1.5 Cabin entertainment equipment.
related to the following:
5.17.1.6 Galley installations.
5.13.2.1 Inspection, testing, troubleshooting, servicing, and
5.17.1.7 Cargo handling and retention equipment.
repair of air conditioning systems, pressurization systems, air
cycle and air vapor machines. 5.17.1.8 Air stairs and main entry doors.
F3476 − 21
5.17.2 Equipment and Furnishings Installations and Re- 5.19.3.11 Operation of artificial feel, yaw damper, mach
quirements – LEVEL 2—Understands and can apply the theory trim, and rudder limiter.
related to the following: 5.19.3.12 Operation of flight control locking systems.
5.17.2.1 Emergency equipment requirements. 5.19.3.13 Operation of stall protection/warning systems.
5.17.2.2 Seats, harnesses, seat belts, and seat installations.
5.20 (ATA 28) Fuel Systems:
5.17.2.3 Cargo loading systems.
5.20.1 Fuel Systems Theory of Operation – LEVEL
5.18 (ATA 26) Fire Protection System:
1—Understands and can describe the following:
5.18.1 Fire Protection System Theory of Operation –
5.20.1.1 Fuel system architecture.
LEVEL 1—Understands and can describe the following:
5.20.1.2 Fuel tanks and bladders.
5.18.1.1 Fire and smoke detection and warning systems.
5.20.1.3 Fuel supply systems.
5.18.1.2 Fire extinguishing systems and system tests.
5.20.1.4 Fuel dumping, venting, and draining.
5.18.2 Fire Protection System Maintenance – LEVEL
5.20.1.5 Fuel cross-feed and transfer.
3—Can describe in detail and perform tasks related to the
5.20.1.6 Fuel quantity and temperature indicating and warn-
following:
ing systems.
5.18.2.1 Inspection, testing, servicing, troubleshooting, and
5.20.1.7 Refueling and defueling.
repair of aircraft fire detection and extinguishing systems.
5.20.1.8 Lateral and longitudinal balance of fuel systems.
5.18.2.2 Inspection and servicing of portable fire extin-
5.20.2 Fuel Systems Maintenance – LEVEL 3—Can de-
guishers.
scribe in detail and perform tasks related to the following:
5.20.2.1 Operation, testing, troubleshooting, servicing, and
5.19 (ATA 27) Flight Control System:
repair of fuel pressure and temperature warning systems.
5.19.1 Flight Control System Theory of Operation – LEVEL
5.20.2.2 Testing and servicing of fuel dump systems.
1—Understands and can describe the following:
5.20.2.3 Fuel management transfers and defueling.
5.19.1.1 Cable and pulley systems.
5.20.2.4 Inspection, testing, and repair of pressure fueling
5.19.1.2 Hydraulic systems.
5.19.1.3 Fly-by-Wire systems. systems.
5.20.2.5 Inspection, testing, servicing, troubleshooting, and
5.19.2 Flight Control System Installation and Requirements
– LEVEL 2—Understands and can apply the theory related to repair of aircraft fuel systems.
the following:
5.21 (ATA 29) Hydraulic Power System:
5.19.2.1 Flight control surface construction and attachment.
5.21.1 Hydraulic Power System Theory of Operation –
5.19.2.2 Rigging of mechanical and electric-hydro flight
LEVEL 1—Understands and can describe the following:
control systems in fixed-win
...