ASTM F2667-07

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: F2667 − 07
StandardPractice for
Design and Manufacture of Reciprocating Compression
1
Ignition Engines for Unmanned Aircraft Systems
This standard is issued under the fixed designation F2667; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 4. Data Requirements
1.1 This practice covers minimum requirements for the 4.1 Retained Data—The following data and information
design and manufacture of reciprocating compression ignition should be retained on file at the manufacturer’s facility for at a
engines for unmanned aircraft systems use. minimum of 18 years after production is discontinued.
4.1.1 Drawings that define the engine configuration.
1.2 This standard does not purport to address all of the
4.1.2 Material and process specifications referenced in the
safety concerns, if any, associated with its use. It is the
parts drawings.
responsibility of the user of this standard to establish appro-
4.1.3 Engineering analyses and test data prepared for quali-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. fication with this specification.
4.2 Delivered Data—The following data should be deliv-
2. Significance and Use
ered to the UAS manufacturer to support design and operation
of the applicable UAS.
2.1 This practice provides designers and manufacturers of
engines for unmanned aircraft systems design references and 4.2.1 An engine performance specification that defines the
criteria to use in designing and manufacturing engines. engine performance under all anticipated operating environ-
ments.
2.2 Declaration of compliance is based on testing and
4.2.2 An installation manual that defines all functional and
documentation during the design and testing or flight testing of
physical interface requirements of the engine. This should
the engine type by the manufacturer or under the manufactur-
include an engine outline/installation drawing.
er’s guidance.
4.2.3 An operating manual that defines normal and abnor-
mal operating procedures and any applicable operating limita-
3. Engine Model Designation
tions.
3.1 Engine Parts List—A parts list is required for each
4.2.4 A maintenance manual that defines periodic installed
engine model qualified in accordance with this specification.
maintenance, major inspection, overhaul intervals, and any
3.2 New Engine Model Designations: other maintenance limitations.
3.2.1 Each new engine model must be qualified in accor- 4.2.5 An overhaul manual that provides instruction for
dance with this practice. disassembling the engine to replace and/or repair parts as
required to return the engine to airworthy condition that is safe
3.2.2 Design or configuration changes that impact the in-
for operation until the next major overhaul, if the OEM allows
stallation interface, performance, or operability of the engine
overhauls outside of the OEMs facilities.
require a new engine model designation.
3.3 Design Changes of Parts—Each design change of a part
5. Design Criteria
or component of an engine model qualified to this specification
should be evaluated relative to the requirements of this 5.1 Materials—The materials used in the engine must be
specification. adequate for the intended design conditions of the engine.
5.2 Fire Prevention—The design and construction of the
engine and the materials used must minimize the probability of
1
This practice is under the jurisdiction of ASTM Committee F38 on Unmanned
the occurrence and spread of fire by:
Aircraft Systems and is the direct responsibility of Subcommittee F38.01 on
5.2.1 Using fire-resistant lines, fittings, and other compo-
Airworthiness.
nents that contain a flammable liquid when supplied with the
Current edition approved July 1, 2007. Published August 2007. DOI: 10.1520/
F2667-07. engine; and
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
F2667 − 07
5.2.2 Shielding or locating components to safeguard against 5.8.2 The lubrication system of the engine must be designed
the ignition of leaking flammable fluid. and constructed to allow installing a means of cooling the
lubricant if required.
5.3 Engine Cooling—The engine design must include pro-
5.8.3 Engine crankcases must be vented to the atmosphere
visionsforcooling;theinstallationmanualmustspecifyengine
to preclude leakage of oil from excessive pressure in the
and component temperature limitations.
crankcase. This v
...