ASTM F3366-19

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: F3366 −19
Standard Specification for
General Maintenance Manual (GMM) for a small Unmanned
Aircraft System (sUAS)
This standard is issued under the fixed designation F3366; 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 F2910 Specification for Design and Construction of a Small
Unmanned Aircraft System (sUAS)
1.1 This specification provides the minimum requirements
F2911 Practice for Production Acceptance of Small Un-
for a General Maintenance Manual (GMM) for an unmanned
manned Aircraft System (sUAS)
aircraft system (UAS) designed, manufactured, and operated in
F3002 Specification for Design of the Command and Con-
the small UAS category as defined by a Civil Aviation
trolSystemforSmallUnmannedAircraftSystems(sUAS)
Authority (CAA).
F3003 Specification for Quality Assurance of a Small Un-
1.2 This specification applies to support professional enti-
manned Aircraft System (sUAS)
ties that will receive operator certification by a CAA, and
F3005 Specification for Batteries for Use in Small Un-
provide standards of practice for self- or third-party audit of
manned Aircraft Systems (sUAS)
operators of UAS.
F3298 Specification for Design, Construction, and Verifica-
tion of Lightweight Unmanned Aircraft Systems (UAS)
1.3 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical 2.2 Federal Standards:
conversions to SI units that are provided for information only 14 CFR Part 43 Maintenance, Preventive Maintenance,
and are not considered standard. Rebuilding, and Alteration
14 CFR Part 107 Small Unmanned Aircraft Systems
1.4 This standard does not purport to address all of the
2.3 Military Standard:
safety concerns, if any, associated with its use. It is the
MIL-STD-3001 Preparation of Digital Technical Informa-
responsibility of the user of this standard to establish appro-
tion for Multi-Output Presentation of Technical Manuals
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
3. Terminology
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard- 3.1 Definitions:
3.1.1 applicant/proponent, n—the person or organization
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom- responsible for seeking the approval to operate and operating a
UA. The applicant/proponent may be one of the following
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. entities: manufacturer, operator, or original equipment manu-
facturer.
2. Referenced Documents
3.1.1.1 manufacturer, n—the person or organization who
causes production of a product or article. A manufacturer may
2.1 ASTM Standards:
also be an operator.
F2908 Specification for Unmanned Aircraft Flight Manual
(UFM) for an Unmanned Aircraft System (UAS)
3.1.1.2 operator, n—the person or organization who applies
F2909 Practice for Maintenance and Continued Airworthi-
for CAA approval to operate a UAS or who seeks operational
ness of Small Unmanned Aircraft Systems (sUAS)
approval for types of flight operations prohibited by a CAAfor
that UAS.
3.1.1.3 original equipment manufacturer (OEM), n—the
This specification is under the jurisdiction of ASTM Committee F38 on
person or organization who first produced that product or
UnmannedAircraftSystemsandisthedirectresponsibilityofSubcommitteeF38.03
article. An OEM may also be an operator.
on Personnel Training, Qualification and Certification.
Current edition approved May 1, 2019. Published June 2019. DOI: 10.1520/
F3366–19.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from U.S. Government Publishing Office, 732 N. Capitol St., NW,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Washington, DC 20401, http://www.gpo.gov.
Standards volume information, refer to the standard’s Document Summary page on Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
the ASTM website. Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
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F3366 − 19
3.1.2 field maintenance, n—inspections and repairs made by 3.2.8 UA—Unmanned Aircraft
owners/operators at a remote operating location away from
3.2.9 UFM—Unmanned Aircraft Flight Manual
their normal maintenance facility/provider.
3.1.3 light unmanned aircraft systems, n—unmanned small
4. Applicability
aircraft that are approved for operation under the authority of
4.1 The purpose of the GMM is to provide guidance to
a CAA.
owners, operators, mechanics, pilots, crew members, airports,
3.1.3.1 Discussion—For example, UAS approved to operate
regulatory officials, and aircraft and component manufacturers;
by the FAAunder 14 CFR Part 107; UAS approved to operate
that includes scheduled and unscheduled overhaul, repair,
by EASA as Open and Specific Category UA; and UAS
inspection, modification, replacement, and system software
approved to operate by CASA as Small, Medium, or Large
upgrades of the sUAS and its components necessary for flight.
RPA, or combinations thereof. F3298
4.1.1 For sUAS of a certain size and simplicity, the UFM
3.1.4 model, n—a manufacturer-issued unique identifying
may also cover instruction for maintenance and continued
number or code assigned to each manufactured type of aircraft
airworthiness for the minor maintenance, repair, and alteration
having the same structural design, components, and standard
ofsUASasprovidedforinSpecificationF2908.Anexampleof
configuration.
size and simplicity includes sUAS that are categorized and
labeled by EASA UA Class identification C0, C1, C2.
3.1.5 proprotor, n—a combination propeller and rotor blade
4.1.2 Sections 6 and 7 of this specification serve as tem-
used to generate lift and thrust, but incapable of controlled
plates for manufacturers to structure their GMM. (See Practice
autorotative flight.
F2911.)
3.1.6 shall vs. should vs. may, v—use of the word “shall”
4.1.3 Maintenance manuals that do not include all of the
implies that a procedure or statement is mandatory and must be
minimum requirements of this specification may not be re-
followed to comply with this specification; “should” implies
ferred to as meeting this specification.
recommended; and “may” implies optional at the discretion of
the supplier, manufacturer, or operator.
5. General Requirements
3.1.6.1 Discussion—Since “shall” statements are
requirements, they include sufficient detail needed to define
5.1 The GMM shall provide instructions in the following
compliance (for example, threshold values, test methods,
areas for a specific model of sUAS:
oversight, reference to other standards). “Should” statements
5.1.1 Handling,
areprovidedasguidancetowardstheoverallgoalofimproving
5.1.2 Servicing,
safety, and could include only subjective statements. “Should”
5.1.3 Field or preventative maintenance,
statements also represent parameters that could be used in
5.1.4 Instructions for continued airworthiness, and
safety evaluations, and could lead to development of future
5.1.5 Referencing separate component manufacturer pro-
requirements. “May” statements are provided to clarify accept-
vided instructions or manuals.
ability of a specific item or practice, and offer options for
5.2 The GMM technical content shall be consistent with the
satisfying requirements.
data developed in accordance with Practice F2909 and Speci-
3.1.7 small unmanned aircraft system (sUAS), n—composed
fications F2910, F3002, and F3005.
ofthesmallunmannedaircraft(sUA)andallrequiredon-board
5.3 The GMM shall be structured in accordance with
subsystems, payload, control station, other required off-board
Section 6 of this specification.
subsystems, any required launch and recovery equipment, and
command and control (C2) links between the sUA and the
5.4 The GMM content shall be in accordance with Section
control station.
7 of this specification.
3.1.7.1 Discussion—For purposes of this specification, 5.5 All revisions, omissions, errors, changes, or updates to
sUAS is synonymous with the term small Remotely Piloted the GMM shall be tracked and distributed to all sUAS owners
Aircraft System (sRPAS) and sUA is synonymous with the of record in accordance with the quality assurance require-
term small Remotely Piloted Aircraft (sRPA). ments of Specification F3003.
3.1.7.2 Discussion—Unless otherwise specified by a CAA,
5.6 The GMM shall present a style, format, and appearance
the term “sUAS” applies only to UA that have a maximum
in accordance with accepted government or industry best
takeoff gross weight of les
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