DI-ENVR-82540

Acquisition and Sustainment Data Package (ASDP) Environmental Criteria Document (ECD) and Report

The Environmental Criteria Document provides a detailed characterization of the natural and induced environments affecting an air system throughout its life cycle, supporting design criteria, qualification, and airworthiness certification.

Approval DateMay 8, 2026

AMSC Number10661

Preparing ActivityAF-11 (AFLCMC/EN-EZ)

Project NumberENVR-2026-005

OPR—

DTIC ApplicableNo

GIDEP ApplicableNo

Limitation—

Applicable Forms—

Approval Limitation—

Form Version—

DID Formatfree_text

963C CompliantYes

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.

Supersedes

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DI-SESS-82361

Description & Purpose

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Application & Interrelationship

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Use & Relationship

The Environmental Criteria Document (ECD) shall provide a detailed characterization of the natural and induced environments to which the system, subsystem, zone, assembly, or part will be subjected throughout the life cycle. The principal uses are to (1) define the natural environments an air system will be exposed to for its service life, (2) contain the measured system environmental stress levels to be used for design criteria generation and qualification activities as required by MIL-STD-1530 Aircraft Structural Integrity Program (ASIP), MIL-STD-1798 Mechanical Equipment and Subsystems Integrity Program (MECSIP), MIL-HDBK-525 Guidance for the Design, Development, and Testing of Electrical Wiring Interconnection Systems (EWIS), MIL-STD-3024 Propulsion Systems Integrity Program, Avionics Integrity Program (AVIP), and MIL-STD-3063 Rotorcraft Structural Integrity Program (RSIP) (3) characterize the induced environments, including those generated by the material platform, and (4) identify the verification activities that will show compliance to the specification requirements and airworthiness certification criteria associated with air system environment in the natural and induced environments for its service life.

a. This Data Item Description (DID) is applicable to any contract pertaining to air vehicle development, modification, or when an Environmental Criteria Document is required.

b. This Data Item Description contains the format, content, and intended use information for the data deliverable resulting from the work task described in the solicitation.

Preparation Instructions

1Reference documents.The applicable issue of the documents cited herein, including their approval dates and dates of any applicable amendments, notices, and revisions are as specified in the contract.

2Format.The Environmental Criteria Document format shall be contractor selected. Each update report shall reflect the total environmental analysis and status.

3Content.The Environmental Criteria Document shall contain the following:

3.1System description.This will consist of summary descriptions of the physical and functional characteristics of the air system and its components. Reference to more detailed system and component descriptions, including specifications and detailed review documentation shall be supplied when documentation is available. The capabilities, limitations, and interdependence of these components shall include identification of items and functions associated with safe operation of the air system. System block diagrams or functional flow diagrams shall be used to clarify system description. The intended operational usage of the system shall be identified including base and deployed locations, flight envelope, transportation, and storage. A Life Cycle Environmental Profile (LCEP), as defined by MIL-STD-810 Task 402, captures the necessary requirements to define intended operational usage for environment definition and characterization purposes.

3.2Natural environments for the air system.The ECD shall present the intended natural environments the air system and its subsystems, zones, assemblies, and components will be exposed to for its service life. This definition is predicated on the intended concept of operations (CONOPS), operational mode summary (OMS), and mission profile (MP), including the information on base and deployed locations, flight envelope, transportation, and storage. Guidance for identifying environments is contained in MIL-HDBK-310, Global Climatic Data for Developing Military Products, MIL-STD-810, MIL-STD-461 Requirements for the Control of Electromagnetic Interference Characteristics of Subsystems and Equipment, MIL-STD-464 Electromagnetic Environmental Effects Requirements for Systems, Integrity Programs listed Use/Relationship section of the DID, Environmental Engineering Considerations and Laboratory Tests, and Army Regulation 70-38, Research, Development, Test and Evaluation of Materiel for Worldwide Use. For each natural environment, define the high and low values and anticipated environmental cycles appropriate to the CONOPS/OMS/MP. The following shall be delivered: CONOPS/OMS/MP and the analysis that goes with environments below.

3.2.1The environmental parameters are defined by:

3.2.1.1Extreme values

3.2.1.1.1For overall air system environment, if data other than that contained in MIL-HDBK-310 is used, provide substantiating information on validity of the data.

3.2.1.1.2Extreme values for certain subsystems are addressed by other standards (e.g., MIL-PRF-5606 for hydraulics).

3.2.1.2Transient values, rates, duration

3.2.1.2.1Addresses all operational modes (e.g. taxi, takeoff, climb, cruise, dogfighting, descent, landing).

3.2.1.3Times of exposure

3.2.1.4Exposure levels

3.2.1.5Spectrum indication

3.2.2The natural environments that must be addressed for the intended CONOPS/OMS/MP are:

3.2.2.1Temperature

3.2.2.2Atmospheric pressure

3.2.2.3Atmospheric density

3.2.2.4Wind speed and wind shear

3.2.2.5Humidity

3.2.2.6Rainfall rate and water concentration

3.2.2.7Blowing snow and snowload

3.2.2.8Ice accretion

3.2.2.9Hail size

3.2.2.10Ozone concentration

3.2.2.11Solar radiation

3.2.2.12Sand and dust

3.2.2.13Freeze-thaw cycles

3.2.2.14Salt atmosphere and spray

3.3Zone definitions.To simplify environmental parameter definitions for the air system and its subsystems, assemblies, and components, zones shall be defined for the air system. The ECD shall present the analytical and measured characterization of air system zones. When such information is based on estimates, it shall be replaced by actual values as they are determined. Examples of zones to be defined are below:

3.3.1Temperature zones based on equipment cooling considerations as well as induced thermal environment from propulsion system and component operation

3.3.2Pressurization of compartments

3.3.3Hazard zones

3.3.4Zones based on vibration spectra determination

3.3.5Flammable fluid leakage zone

3.4Integrity programs.Integrity Programs listed Use/Relationship section of the DID required data shall be traced and described with the information below. The ECD shall present analytical and measured characterization of the environmental stresses that the system, subsystem, zone, assembly, or part are expected to endure throughout their lifecycle. When such information is based on estimates, it shall be replaced by actual values as they are determined. Each update to the document shall reflect the total environment and status. The document shall be prepared based on the interpretation and evaluation of tests and analyses:

3.4.1The document shall contain the following:

3.4.1.1Initial estimates of the considered environment of the system.

3.4.1.2Justification of how the variation of the environment is understood, measured, quantified, and accounted for.

3.4.1.3The number of measurements for which the average stress values and design achievements are determined as well as their characteristic variability expressed in terms of the standard deviation.

3.4.1.4Environmental parameters defined by (when applicable):

3.4.1.4.1Desired accuracy

3.4.1.4.2Extreme values

3.4.1.4.3Transient values, rates, duration

3.4.1.4.4Times of exposure

3.4.1.4.5Exposure levels

3.4.1.4.6Spectrum indication

3.4.1.4.7Support structures transmissivity values

3.4.1.5Standard publication procedures for test procedure descriptions.Procedures that differ from standard publications shall be thoroughly explained.

3.4.1.6For Contractor off the Shelf (COTS) or Government off The Shelf (GOTS):

3.4.1.6.1Discussion of parameters as part of a natural environmental interface or database.

3.4.1.6.2Presentation of qualification reports.

3.4.1.7Description of the flight/ground test programs and instrumentation for verifying the established environmental requirements.

3.4.1.8An overview of the environmental boundary.

3.4.1.9Environmental problem areas including indications of the need for greater environmental forecasting capability and areas requiring greater Research and Development (R&D) effort.

3.4.1.10Presentation of the status of environmental progress reports which shall contain the following:

3.4.1.10.1All changes to the established environmental requirements, testing procedures, or flight test program.

3.4.1.10.2A summarization of R&D environmental efforts and problem areas.

3.4.1.10.3A summarization of all environmental test data.

3.4.1.11Environmental parameters induced by equipment operation, transportation, routine testing, handling, and storage.

3.4.1.12Description of the environment that the aircraft is exposed to regarding the type of exposure, rate of exposure, and exposure attributes.

3.4.2Environmental considerations:

3.4.2.1Ambient pressures, unpressurized compartments, cockpit pressures, and fuel tank pressures

3.4.2.2Aircraft storage temperatures, internal compartment operating and non-operating temperatures, external surface temperatures, and electronic equipment cooling

3.4.2.3Crew station ventilation, weapon bay ventilation, and engine bay ventilation

3.4.2.4Acoustic vibration, noise vibration, and mechanical vibration, gun vibration

3.4.2.5Acceleration loads, gyroscopic moments, and shock loads

3.4.2.6Explosive atmosphere and fire protection zones

3.4.2.7Humidity, moisture, and precipitation

3.4.2.8Salt spray, gunfire gases, missile gases, sulfur and nitrogen oxides

3.4.2.9Fungus, sand, and dust

3.4.2.10Electromagnetic Interference (EMI), Electromagnetic Compatibility (EMC), lightning, and lasers

3.4.3Documentation of new, analytically correlated test data in a revision to the ECD after any significant environmental test program is completed.These test programs shall include all of the requirements listed above, to include, aircraft acoustic and vibration flight testing, gun fire testing, stores acoustic and vibration flight testing, and engine ground run acoustic and vibration testing.

3.5Induced environments for the air system.Induced environments are predominantly man-made or generated by the material platform. It also refers to any condition internal to material that results from the combination of natural environment forcing functions and the physical/chemical characteristics of the material itself. Definition of the induced environments is predicated on the intended CONOPS/OMS/MP, including the information on base and deployed locations, flight envelope, transportation, and storage for the air system and its subsystems, assemblies, and parts. The ECD shall present the analytical and measured characterization of the induced environments that the air system, subsystem, zone, assembly, or part are expected to endure throughout their service life. When such information is based on estimates, it shall be replaced by actual values as they are determined. Each update to the document shall reflect the total environment and status.

3.5.1Air system considerations that affect induced environmental parameters include:

3.5.1.1Intended altitude envelope

3.5.1.2Canopy thermal environment

3.5.1.3Forced air cooling (forced air flow)

3.5.1.4Ventilation in locations including crew station(s), weapon bay(s), engine bay(s), Auxiliary Power Unit (APU) bay, and equipment bay(s)

3.5.1.5Platform acceleration, deceleration, and maneuver, including crash landing loads

3.5.1.6Mechanical, acoustic, and gunfire vibration

3.5.1.7Handling and transportation shocks

3.5.1.8Fluid resistance

3.5.1.9Water intrusion and collection, including open doors during operations/servicing and seepage through the air vehicle skin

3.5.2The environmental parameters are defined by:

3.5.2.1Extreme values

3.5.2.2Transient values, rates, duration

3.5.2.2.1Addresses all operational modes (e.g. taxi, takeoff, climb, cruise, dogfighting, descent, landing) for the air system, subsystem, zones, assemblies, and parts.

3.5.2.2.2Also addresses transportation and shipping for subsystems, assemblies, and parts.

3.5.2.3Times of exposure

3.5.2.4Exposure levels

3.5.2.5Spectrum indication

3.5.3The ECD must tailor the application of induced environments for the air system and all subsystems, zones, assemblies and parts.Induced environments identified in MIL-STD-810 are listed below. Additional induced environments shall be identified depending on the air system and its usage:

3.5.3.1Pressure

3.5.3.2Temperature and temperature shock.This includes addressing equipment cooling considerations as well as induced thermal environment from propulsion system and component operation.

3.5.3.3Solar radiation

3.5.3.4Contamination by fluids

3.5.3.5Humidity, moisture, and precipitation.This includes effects of water intrusion and concentration.

3.5.3.6Immersion

3.5.3.7Fungus

3.5.3.8Salt fog and corrosive environments.This includes gunfire gases, missile gases, sulfur and nitrogen oxides, and chemical, biological, radiological, and nuclear weapons/materials.

3.5.3.9Explosive atmosphere and hazard zones

3.5.3.10Acceleration.List all types of loads. The ECD shall address air vehicle, aerodynamic, maneuvering, crash loads, weapons load outs, etc. Loads must be determined via test versus using generic values. The ECD shall include load values for the air vehicle that would be used for qualification and verification for all components.

3.5.3.11Vibration.Including mechanical, acoustic, and gunfire vibration. Vibration shall be determined via test versus using generic values. Where vehicles are divided into zones, vibration is distinct for each zone. The ECD includes vibration values for the air vehicle that would be used for qualification and verification for all components.

3.5.3.12Shock.Including information on types of shock. Shock shall be determined via test versus using generic values. The ECD includes shock values for the air vehicle that would be used for qualification and verification for all components.

3.5.3.13Acidic atmosphere

3.5.3.14Vibro-acoustic/temperature for externally carried aircraft stores

3.6Environmental requirement mapping.The natural and induced environment requirements are mapped out for the air system to the lowest level. Requirements can be allocated to zones, assemblies, components, or other level of the physical architecture. Safety criticality of the system, subsystem, assembly, or component is identified in the requirements mapping. This supports identification of the environmental assessment necessary to determine airworthiness of the air system. The mapping shall be correlated to the analysis and testing of the zones.

3.6.1The air system includes the air vehicle plus the support systems for the air vehicle(e.g., communications, control, ground/surface/control station, launch and recovery, and support elements).

3.7Verification activities.For each environmental requirement, the verification methodology is identified. This includes identification of necessary resources such as environmental testing or climatic laboratories.

3.7.1Verification activities are denoted by the verification type as defined in MIL-STD-961, MIL-STD-461, MIL-STD-464, Integrity Programs listed Use/Relationship section of the DID, and MIL-HDBK-310.Verification types are examination, analysis, demonstration, and test (laboratory, ground, and flight).

3.7.2Verification activities are included in the environmental requirement mapping noted in paragraph 3.6.

3.7.3A requirements and verification mapping analysis with test plans, procedures, and reports shall be provided with Zones and system, subsystems, and components in the zones with reference to the requirement ID and verification artifact (test plans, procedures, and reports).This shall be in the form of a table with the components and test plan, procedures, and reports associated. There shall be an annotation if the system, subsystems, and components do not meet the requirement and reference the gap analysis in 3.8. The test plan, procedures, and verification reports shall also be delivered, and be in accordance with DI-SESS-82361 Acquisition and Sustainment Data Package (ASDP) Technical Report.

3.8Gap analysis for requirements.Where the program deviates from published military standards for environmental requirements (e.g., use of DO-160 in lieu of MIL-STD-810 or use of an earlier revision of the standard), a gap analysis is included to address the differences. If a gap is found, the 3.7.c shall have a risk traced to the gap per MIL-STD-882 and the requirement(s).

References

Copies of these documents can be obtained at https://assistca.dla.mil/

Copy of this regulation can be obtained at https://armypubs.army.mil/epubs

Copy of this document can be obtained at https://www.rtca.org/

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