ASTM F2689-08

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Designation: F2689 − 08
StandardPractice for
Design and Manufacture of Reciprocating Spark Ignition
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Engines for Unmanned Aircraft Systems
This standard is issued under the fixed designation F2689; 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 4.2.2 Design or configuration changes that impact the in-
stallation interface, performance, or operability of the engine
1.1 This practice covers minimum requirements for the
require a new engine model designation.
design and manufacture of reciprocating spark ignition engines
for unmanned aircraft systems. 4.3 Design Changes of Parts—Each design change of a part
or component of an engine model qualified to this specification
1.2 This standard does not purport to address all of the
shouldbetocomplywiththerequirementsofthisspecification.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Data Requirements
priate safety and health practices and determine the applica-
5.1 Retained Data—The following data and information
bility of regulatory limitations prior to use.
should be retained on file at the manufacturer’s facility for a
2. Referenced Documents minimum of 18 years after production is discontinued.
5.1.1 Drawings that define the engine configuration.
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2.1 RTCA Standard:
5.1.2 Material and process specifications referenced in the
RTCA DO-178B Software Considerations in Airborne Sys-
parts drawings.
tems and Equipment Certification
5.1.3 Engineering analyses and test data prepared for quali-
fication with this specification.
3. Significance and Use
5.2 Delivered Data—The following data should be deliv-
3.1 This practice provides designers and manufacturers of
ered to the airplane manufacturer to support design and
engines for unmanned aircraft systems design requirements
operation of the applicable airplane.
and criteria to use in designing and manufacturing engines.
5.2.1 An engine performance specification that defines the
3.2 Declaration of compliance is based on testing and
engine performance under all anticipated operating environ-
documentation during the design and testing or flight testing of
ments.
the engine type by the manufacturer or under the manufactur-
5.2.2 An installation manual that defines all functional and
ers’ guidance.
physical interface requirements of the engine. This should
3.3 Compliance with this specification is intended to dem- include an engine outline/installation drawing.
5.2.3 An operating manual that defines normal and abnor-
onstrate an adequate level of reliability in accordance with the
UAS safety objectives. mal operating procedures and any applicable operating limita-
tions.
4. Engine Model Designation
5.2.4 A maintenance manual that defines periodic installed
maintenance, major inspection, overhaul intervals, and any
4.1 Engine Parts List—A parts list is required for each
other maintenance limitations.
engine model qualified in accordance with this specification.
5.2.5 An overhaul manual that provides instructions for
4.2 New Engine Model Designations:
disassembling the engine to replace or repair, or both, parts as
4.2.1 Each new engine model must be qualified in accor-
required to return the engine to a condition that is safe for
dance with this practice.
operation until the next major overhaul. A manufacturer may
withholdanoverhaulmanualiftheyfeelsthatamajoroverhaul
cannotbedoneinthefieldwithreasonableassurancethatitcan
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This practice is under the jurisdiction ofASTM Committee F38 on Unmanned
result in an safe for flight condition.
Aircraft Systems and is the direct responsibility of Subcommittee F38.01 on
Airworthiness.
Current edition approved Aug. 1, 2008. Published August 2008. DOI: 10.1520/ 6. Design Criteria
F2689-08.
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6.1 Materials—The materials used in the engine must be
Available from RTCA, Inc., 1828 L Street, NW, Suite 805, Washington, DC
20036, www.rtca.org. adequate for the intended design conditions of the engine.
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F2689 − 08
6.2 Fire Prevention—The design and construction of the in accordance with best industry practices generally accepted
engine and the materials used must minimize the probability of by the aviation industry.
the occurrence and spread of fire by:
6.9 Fuel and Induction System:
6.2.1 Using fire-resistant lines, fittings, and other compo-
6.9.1 Induction System Icing—The fuel and air intake pas-
nents that contain a flammable liquid when supplied wi
...