AC 147-3B

Historical

Advisory circular · Certification and Operation of Aviation Maintenance Technician Schools

A newer version is currentThis is a historical version. AC 147-3C is the version in force, approved March 22, 2022.
Approved
June 5, 2015
Last reviewed
September 12, 2024
Cancels
AC147-3A
Cancelled by
AC147-3C
Family
AC 147-3 · 4 versions
Revision
B
14 CFR parts
147

Guidance, not mandatory unless a rule or AD requires it. DRS record last changed November 21, 2025.

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(3) Hydraulic and vacuum systems for aircraft, aircraft engines, and their appliances.

A supply of hydraulic and vacuum system components for aircraft, aircraft engines and their appliances are available for student use.

(g) Suitable space with adequate equipment, including tables, benches, stands, and jacks, for disassembling, inspecting, and rigging aircraft.

The designated shop area provides suitable space and contains adequate equipment for disassembling, inspecting and rigging aircraft.

(h) Suitable space with adequate equipment for disassembling, inspecting, assembling, troubleshooting, and timing engines.

The lab/shop areas provide suitable space and contain adequate equipment for disassembling, inspecting, assembling, troubleshooting, and timing engines.

147.17 Instructional equipment requirements.

(a) An applicant for a mechanic school certificate and rating, or for an additional rating, must have such of the following instructional equipment as is appropriate to the rating he seeks:

The instructional equipment to be used by [Applicant] is included as Attachment [X] to the application form. The equipment meets the needs of the required standards defined in this section of the Rule for type and quantity required for the maximum number of students to be approved.

(1) Various kinds of airframe structures, airframe systems and components, powerplants, and powerplant systems and components (including propellers), of a quantity and type suitable to complete the practical projects required by its approved curriculums.

A variety of airframe structures, airframe systems and components, powerplants, and powerplant systems and components, including propellers is available for student use. They are of a quantity and type suitable to complete the practical projects required by the approved curriculum.

(2) At least one aircraft of a type currently certificated by FAA for private or commercial operation, with powerplant, propeller, instruments, navigation and communications equipment, landing lights, and other equipment and accessories on which a maintenance technician might be required to work and with which the technician should be familiar.

A(n) [Aircraft Make and Model] shall serve to meet the specific requirements of 147.17 (a) (2).

(b) The equipment required by paragraph (a) of this section need not be in an airworthy condition. However, if it was damaged, it must have been repaired enough for complete assembly.

The [Aircraft Make and Model] is complete and operational.

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(c) Airframes, powerplants, propellers, appliances, and components thereof, on which instruction is to be given, and from which practical working experience is to be gained, must be so diversified as to show the different methods of construction, assembly, inspection, and operation when installed in an aircraft for use. There must be enough units so that not more than eight students will work on any one unit at a time.

The Operations Manual establishes class size and requires the school to schedule classes in such a way that no more t han eight (8) students will be required to work on any one piece of equipment at the same time (147.17(c)). See Operations Manual, page [X].

(d) If the aircraft used for instructional purposes does not have retractable landing gear and wing flaps, the school must provide training aids, or operational mock-ups of them.

The [Aircraft Make and Model] to be used for instructional purposes has retractable landing gear and wing flaps (147.17 (d)). Additional aircraft and mock -ups shall also be available to meet this requirement.

147.19 Materials, special tools, and shop equipment requirements.

An applicant for an aviation maintenance technician school certificate and rating, or for an additional rating, must have an adequate supply of material, special tools, and such of the shop equipment as are appropriate to the approved curriculum of the school and are used in constructing and maintaining aircraft, to assure that each student will be properly instructed. The special tools and shop equipment must be in satisfa ctory working condition for the purpose for which they are to be used.

The inventory of tools and equipment is included as Attachment [X] to the application form.

Training shall be performed to at least the indicated level of proficiency as defined in Appendix A of part 147. Equipment will be maintained in satisfactory working condition for the purpose for which they are to be used. [Applicant] will maintain an adequate supply of expendable materials to support the requirements of the approved curriculum, for the number of students enrolled. See Operations Manual page [x].

147.21 General curriculum requirements.

(a) An applicant for an aviation maintenance technician school certificate and rating, or for an additional rating, must have an approved curriculum that is designed to qualify his students to perform the duties of a mechanic for a particular rating or ratings.

The curriculum for this program has been submitted as the Curriculum Manual.

(b) The curriculum must offer at least the following number o f hours of instruction for the rating shown, and the instruction unit hour shall not be less than 50 minutes in length:

(1) Airframe—1,150 hours (400 general plus 750 airframe).

A single rating program is not included in this application.

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(2) Powerplant—1,150 hours (400 general plus 750 powerplant).

A single rating program is not included in this application.

(3) Combined airframe and powerplant—1,900 hours (400 general plus 750 airframe and 750 powerplant).

[Applicant] has submitted a curriculum designe d to provide instruction for the combined Airframe and Powerplant rating. This document is titled Curriculum Manual and accompanies the application package. The curriculum indicates a program length of [X] total hours for the combined rating. This includes [X] hours in the General Subjects, [X] hours in Airframe Subjects and [X] hours in Powerplant Subjects. A program summary by section may be found in the Operations Manual on page [X].

(c) The curriculum must cover the subjects and items prescribed in appendices B, C, or D, as applicable. Each item must be taught to at least the indicated level of proficiency, as defined in appendix A.

Complete descriptions of the curriculum content for the General, Airframe and Powerplant sections which comply with part 147, Appendices B, C, and D, is contained in Curriculum Manual. The description includes course outlines, proficiency levels, practical projects, and required tests for each subject in the curriculum.

(d) The curriculum must show:

(1) The required practical projects to be completed;

The performance objectives required to meet the standards of part 147 are presented under the heading Required Projects for each subject area are presented in the Curriculum Manual.

(2) For each subject, the proportions of theory and other instruction to be given;

The proportions of classroom and shop time for each subject are shown under Course Duration for each subject area presented in the Curriculum Manual.

(3) A list of the minimum required school tests to be given.

A subject Final Exam is required for each subject in the curriculum. To receive credit for a subject, the student must achieve a minimum of 70% on the subject final exam. This policy is presented in the Operations Manual on page [X].

(e) Notwithstanding the provisions of paragraphs (a) through (d) of this section and § 147.11, the holder of a certificate issued under subpart B of this part may apply for and receive approval of special courses in the performance of special inspection and preventive maintenance programs for a primary category aircraft type certificated under §21.24(b) of this chapter. The school may also issue certificates of competency to persons successfully completing such courses provided

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Appendix 12 that all other requirements of this part are met and the certificate of competency specifies the aircraft make and model to which the certificate applies.

[Applicant] does not intend to offer any special courses at this time.

147.23 Instructor requirements.

An applicant for an aviation maintenance technician school certificate and rating, or for an additional rating, must provide the number of instructors holding appropriate mechanic certificates and ratings that the Administrator determines necessary to provide adequate instruction and supervision of the students, including at least one such instructor for each 25 students in each shop class. However, the applicant may provide specialized instructors, who are not certificated mechanics, to teach mathematics, physics, basic electricity, basic hydraulics, drawing, and similar subjects. The applicant is required to maintain a list of the names and qualifications of specialized instructors, and upon request, provide a copy of the list to the FAA.

[Applicant] will provide FAA Certificated Airframe and Powerplant Mechanics for the instruction and supervision of students. A listing of instructors and their certificate numbers is included as Attachment [X] of the application. A list of current instructors is maintained by the [Applicant] Director and is available to the FAA upon request.

Subpart C—Operating Rules

147.31 Attendance and enrollment, tests, and credit for prior instruction or experience.

(a) A certificated aviation maintenance technician school may not require any student to attend classes of instruction more than 8 hours in any day or more than 6 days or 40 hours in any 7-day period.

Students will attend school [X] hours per day, [X] days per week. See Operations Manual page [X].

(b) Each school shall give an appropriate test to each student who completes a unit of instruction as shown in that school's approved curriculum.

To receive credit for a subject, the student must achieve a minimum of 70% on the subject final exam. See Operations Manual page [X].

(c) A school may not graduate a student unless he has completed all of the appropriate curriculum requirements. However, the school may credit a student with instruction or previous experience as follows:

[Applicant] may award credit to a student with prior instruction according to the policies seen in the Operations Manual, page [X].

(1) A school may credit a student with instruction satisfactorily completed at:

(i) An accredited university, college, junior college;

(ii) An accredited vocational, technical, trade or high school;

(iii) A military technical school;

(iv) A certificated aviation maintenance technician school.

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Appendix 12 [Applicant] may award credit to a student with instruction satisfactorily completed at one of these institutions as evidenced by an Official Transcript.

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Appendix 12

(2) A school may determine the amount of credit to be allowed:

(i) By an entrance test equal to one given to the students who complete a comparable required curriculum subject at the crediting school;

(ii) By an evaluation of an authenticated transcript from the student's former school; or

(iii) In the case of an applicant from a military school, only on the basis of an entrance test.

[Applicant] will determine the amount of credit to be awarded based on an authenticated transcript from the former school, or in the case of military technical schools, based on the results of bypass examination(s).

(3) A school may credit a student with previous aviation maintenance experience comparable to required curriculum subjects. It must determine the amount of credit to be allowed by documents verifying that experience, and by giving the student a test equal to the one given to students who complete the comparable required curriculum subject at the school.

[Applicant] does not credit students with previous maintenance experience comparable to required curriculum subjects.

(4) A school may credit a student seeking an additional rating with previous satisfactory completion of the general portion of an AMTS curriculum.

Students who hold a valid FAA Mechanic Certificate with either the Airframe or Powerplant Rating may receive credit for the General Section and other subjects based on the rating held.

This is stated in the Operations Manual on page [X].

(d) A school may not have more students enrolled than the number stated in its application for a certificate, unless it amends its application and has it approved.

[Applicant] has applied for certification for a maximum of [X] day students and [X] night students. See FAA Form 8310-6.

(e) A school shall use an approved system for determining final course grades and for recording student attendance. The system must show hours of absence allowed and show how the missed material will be made available to the student.

Details regarding [Applicant’s] system for determining final course grades, for recording attendance, and showing how missed material will be made available to the student may be found in the Operations Manual on page [X].

147.33 Records.

(a) Each certificated aviation maintenance technician school shall keep a current record of each student enrolled, showing:

(1) His attendance, tests, and grades received on the subjects required by this part;

(2) The instruction credited to him under §147.31(c), if any; and

(3) The authenticated transcript of his grades from that school.

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Appendix 12 [Applicant] employs a system of hard copy records and electronic records which is designed to meet both the requirements of part 147 and those of other regulatory bodies with jurisdiction over the school. The details of this system as it applies to part 147 are presented in the Operations Manual on page [X], along with sample forms and instructions for their use.

It shall retain the record for at least two years after the end of the student's enrollment, and shall make each record available for inspection by the Administrator during that period.

As stated in the Operations Manual, hard copy records will be retained for at least two years.

Electronic records will be maintained longer.

(b) Each school shall keep a current progress chart or individual progress record for each of its students, showing the practical projects or laboratory work completed, or to be completed, by the student in each subject.

During the course of instruction the [student transcript and/or other documentation] serves to meet the requirements of this part. Progress records are maintained by the [Instructor/Registrar] and are available for inspection at any time.

147.35 Transcripts and graduation certificates.

(a) Upon request, each certificated aviation maintenance technician school shall provide a transcript of the student's grades to each student who is graduated from that school or who leaves it before being graduated. An official of the school shall authenticate the transcript. The transcript must state the curriculum in which the student was enrolled, whether the student satisfactorily completed that curriculum, and the final grades the student received.

The Transcript is utilized to record student grades in each subject and serves to meet the requirements of 147.35(a). A sample Transcript can be found in the Operations Manual on page [X].

(b) Each school shall give a graduation certificate or certificate of completion to each student that it graduates. An official of the school shall authenticate the certificate. The certificate must show the date of graduation and the approved curriculum title.

The Graduation Certificate is issued to students who successfully complete all requirements of the program. A sample Graduation Certificate meeting the requirements of 147.35(b) can be found in the Operations Manual on page [X].

147.36 Maintenance of instructor requirements.

Each certificated aviation maintenance technician school shall, after certification or addition of a rating, continue to provide the number of instructors holding appropriate mechanic certificates and ratings that the Administrator determines necessary to provide adequate instruction to the students, including at least one such instructor for each 25 students in each shop class. The school may continue to provide specialized instructors who are not certificated mechanics to teach mathematics, physics, drawing, basic electricity, basic hydraulics, and similar subjects.

[Applicant] shall continue to provide the number of instructors with the appropriate certificates and ratings as is necessary for adequate instruction of the students. See Operations Manual

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Appendix 12 page [X]. At no time will [Applicant] exceed a ratio of 25 students to 1 instructor in the lab/shop setting. See Operations Manual page [X].

147.37 Maintenance of facilities, equipment, and material.

(a) Each certificated aviation maintenance technician school shall provide facilities, equipment, and material equal to the standards currently required for the issue of the certificate and rating that it holds.

[Applicant] shall maintain its facilities, equipment and materials to a standard at least equal to the standards currently required to obtain certification.

(b) A school may not make a substantial change in facilities, equipment, or material that have been approved for a particular curriculum, unless that change is approved in advance.

No substantial changes will be made to facilities, equipment or materials without receiving approval in advance. This policy is seen in the Operations Manual on page [X].

147.38 Maintenance of curriculum requirements.

(a) Each certificated aviation maintenance technician school shall adhere to its approved curriculum. With FAA approval, curriculum subjects may be taught at levels exceeding those shown in appendix A of this part.

To ensure adherence to its approved curriculum, [Applicant] will conduct internal audits by the [Director or other appropriate individual]. Currently, the curriculum that has been submitted for approval includes teaching levels which meet, but do not exceed, those shown in Appendix A of this part. However, should [Applicant] determine that a revision to the curriculum is necessary, any and all changes, including the elevation of teaching levels, shall be submitted to the FAA for approval prior to implementation.

(b) A school may not change its approved curriculum unless the change is approved in advance.

[Applicant] will adhere to its approved curriculum, and at no time will changes be made to the approved curriculum without first submitting changes to and receiving approval from the FAA Administrator. Details of this procedure may be found in the Operations Manual on page [X].

147.38a Quality of instruction.

Each certificated aviation maintenance technician school shall provide instruction of such quality that, of its graduates of a curriculum for each rating who apply for a mechanic certificate or additional rating within 60 days after they are graduated, the percentage of those passing the applicable FAA written tests on their first attempt during any period of 24 calendar months is at least the percentage figured as follows:

[Applicant] will provide instruction of such a quality as to comply with the passing percentages outlined in this section of the FAR. The school’s results and the national passing norms are continuously monitored by the school administration.

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(a) For a school graduating fewer than 51 students during that period—the national passing norm minus the number 20.

(b) For a school graduating at least 51, but fewer than 201, students during that period—the national passing norm minus the number 15.

(c) For a school graduating more than 200 students during that period—the national passing norm minus the number 10.

As used in this section, “national passing norm” is the number representing the percentage of all graduates (of a curriculum for a particular rating) of all certificated aviation maintenance technician schools who apply for a mechanic certificate or additional rating within 60 days after they are graduated and pass the applicable FAA written tests on their first attempt during the period of 24 calendar months described in this section.

[Applicant] is aware of the criteria for monitoring schools and the use of national norms to determine quality of education. [School administrator] will monitor these numbers on a quarterly basis and use that information as part of a continuous improvement process.

147.39 Display of certificate.

Each holder of an aviation maintenance technician school certificate and ratings shall display them at a place in the school that is normally accessible to the public and is not obscured. The certificate must be available for inspection by the Administrator.

[Applicant] will display its AMTS Certificate and ratings on the lobby wall at the facility.

147.41 Change of location.

The holder of an aviation maintenance technician school certificate may not make any change in the school's location unless the change is approved in advance. If the holder desires to change the location he shall notify the Administrator, in writing, at least 30 days before the date the change is contemplated. If he changes its location without approval, the certificate is revoked.

[Applicant] will not change its location without providing written notice at least 30 days prior to the date that the change is contemplated. A change of location will require a new FAA Form 8310-6 to be completed and submitted to the FSDO.

147.43 Inspection.

The Administrator may, at any time, inspect an aviation maintenance technician school to determine its compliance with this part. Such an inspection is normally made once each six months to determine if the school continues to meet the requirements under which it was originally certificated. After such an inspection is made, the school is notified, in writing, of any deficiencies found during the inspection. Other informal inspections may be made from time to time.

[Applicant] acknowledges that the AMTS may be inspected at any time by the Administrator.

[Applicant] also understands that such inspections shall be normally made once every six months to determine if the school continues to meet the requirements under which it was originally certificated. Inspections should begin with notification given to the [Director] as seen on page [X] of the Operations Manual.

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147.45 Advertising.

(a) A certificated aviation maintenance technician school may not make any statement relating to itself that is false or is designed to mislead any person considering enrollment therein.

(b) Whenever an aviation maintenance technician school indicates in advertising that it is a certificated school, it shall clearly distinguish between its approved courses and those that are not approved.

[Applicant] officials will not knowingly make false or misleading statements to any person considering enrollment in its AMTS program. All school advertising must be approved by the [Director in charge of Compliance] prior to publication or broadcast. This policy appears in the Operations Manual on page [X]. [Applicant] will, in its advertising, clearly distinguish between those courses that are FAA Approved and those that are not.