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STANAG 4195
STANAG 4195 engine laboratory test for diesel, gasoline and gas turbine engines
Manufacturers of diesel, gasoline and gas turbine engines for military vehicles, and the defence procurement and test authorities that specify their laboratory qualification.
STANAG 4195 is the NATO standard laboratory test for diesel, gasoline and gas turbine engines used in military vehicles. NATO has not released it publicly; this page describes it from the Czech defence standard that implements it.
- Edition
- 1
- Published
- 1985-11-14
NATO has not released this STANAG publicly. It is NATO UNCLASSIFIED, and organisations that need it obtain it through their national standardization authority.
What it is
STANAG 4195 is the NATO Standardization Agreement on the standard engine laboratory test for diesel and gasoline engines and gas turbine engines, covering the publication AEP-05. Edition 1 was promulgated on 14 November 1985, sponsored by CNAD, AC/225 NAAG, LCGLE. Its purpose is to define test methods and standard conditions so that any NATO state can run the same laboratory test, or read and rely on a test run in another NATO state's laboratory, using identical methods.
NATO has not released STANAG 4195 or AEP-05 publicly. This page describes them from a public national implementation, the Czech defence standard ČOS 280001 (1st edition, amendment 2, 2025), which states that it introduces STANAG 4195 edition 1 and AEP-05 edition 3 into Czech use for laboratory testing of spark-ignition and compression-ignition piston engines and combustion turbines used to power military vehicles. A national implementation can add national requirements and reservations, so treat what follows as the Czech implementation's content, not as NATO's own text.
What the Czech implementation requires of the test
ČOS 280001 sets separate but parallel test regimes for combustion turbines and for diesel and gasoline piston engines. Each full test comprises a manufacturer's break-in run, a full external speed characteristic at full and partial load (85%, 70%, 50% and 25% of full load at each speed tested), a long-duration run, a repeat of the full characteristic, then disassembly, inspection and measurement of selected components. The long-duration run lasts 400 hours, split into four 100-hour periods each built from ten 10-hour test cycles at varying speed and load, with the unit stopped for at least 8 hours on at least five occasions per period; maintenance, oil and filter changes are only permitted between periods. For diesel engines, exhaust smoke during the test must not exceed 4.5 on the Bosch scale.
The standard fixes the conditions under which the test is run and measured: intake air temperature held close to 25°C, intake air pressure loss and exhaust back-pressure of (25±5) mbar and (40±5) mbar respectively at rated power, and fuel temperature of (30±3)°C at the pump inlet, with coolant outlet temperature of (96±3)°C for water-cooled engines. Measurement accuracy is specified for every quantity recorded, from torque and output speed (±0.5%) and fuel consumption (±1%) to intake air temperature (±1°C) and the various pressures (0.25-50 mbar depending on which one). Faults recorded during the test are classified as partial (light, medium or severe, by the repair effort needed) or complete (emergency or end-of-life), and the responsible state authority decides after the 400-hour test and a final inspection whether the unit met AEP-05.
The test report itself is prescribed: photographs of the unit and of its installation on the test stand, a list of its fitted accessories, all measured values in the standard's own recording form, a list of faults and repairs, a condition report on the disassembled unit with photographs of its main components, an oil consumption and analysis record from the long-duration run, fuel analysis, and certificates for the fuels and lubricants used.
How we help
A supplier bound by STANAG 4195 through a contract holds the obtained text through its national authority. In ComplyTrain you record the requirements that apply to you as your own requirements, give each an owner, and keep the evidence that shows you meet them against each one.
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