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diff --git a/wiki/aerospace/standard/ARP4754.org b/wiki/aerospace/standard/ARP4754.org
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+# -*- mode: org; -*-
+
+#+TITLE: ARP4754
+#+SUBTITLE: Guidelines For Development Of Civil Aircraft and Systems.
+#+AUTHOR: Marius Peter
+#+DATE: <2022-02-11 Fri>
+#+EMAIL: mlnp@tuta.io
+#+OPTIONS: toc:nil
+
+#+KEYWORDS: aerospace, SAE, ARP 4754
+
+#+TOC: headlines 2
+
+
+#+begin_abstract
+ARP4754 is a guidance issued by SAE.
+#+end_abstract
+
+
+* Introduction
+
+  https://www.sae.org/standards/content/arp4754a/
+
+  
+* Main topics
+
+| § | Theme               | Description |
+|---+---------------------+-------------|
+| 1 | Development         |             |
+| 2 | Safety              |             |
+| 3 | Requirements mgmt.  |             |
+| 4 | Validation          |             |
+| 5 | Verification        |             |
+| 6 | Configuration mgmt. |             |
+| 7 | Process assurance   |             |
+| 8 | Certification       |             |
diff --git a/wiki/aerospace/standard/DO-160.org b/wiki/aerospace/standard/DO-160.org
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+# -*- mode: org; -*-
+
+#+TITLE: DO-160
+#+SUBTITLE: Environmental Conditions and Test Procedures for Airborne Equipment.
+#+AUTHOR: Marius Peter
+#+DATE: <2022-02-11 Fri>
+#+EMAIL: mlnp@tuta.io
+#+OPTIONS: toc:nil
+
+#+DESCRIPTION: Environmental Conditions and Test Procedures for Airborne Equipment.
+#+KEYWORDS: aerospace, rtca, DO-160
+
+
+#+TOC: headlines 2
+
+
+#+begin_abstract
+The DO-160 document is a standard for environmental testing for
+airborne equipment published by the RTCA.
+#+end_abstract
+
+
+* Introduction
+
+  https://do160.org/rtca-do-160g/
+
+  
+* Equipment categories
+
+Equipments are categorized as a function of the environments to which
+they are subjected during normal operation.
+
+  
+* Sections
+
+Sections 7 and 8 are aircraft dependent.
+
+
+** List
+:PROPERTIES:
+:HTML_CONTAINER_CLASS: big-table
+:END:
+
+#+NAME: sections
+#+CAPTION: List of DO-160 section.
+|  § | Name                                     | Concerns the effects of...                                                         | Parameters of interest                                                     |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+|  1 | /Introductory sections/                  | /N/A/                                                                              | /N/A/                                                                      |
+|  2 |                                          |                                                                                    |                                                                            |
+|  3 |                                          |                                                                                    |                                                                            |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+|  4 | Temperature                              | Temperature on the system.                                                         | Temperature, condensation.                                                 |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+|  4 | Altitude                                 | Altitude & cabin depressurization on performance.                                  | Dielectric strength, (rapidly) varying air pressure.                       |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+|  5 | Temperature Variation                    | Extreme temperature changes.                                                       | Temperature delta, thermal expansion coefficients.                         |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+|  6 | Humidity                                 | High concentrations of humidity; ability to withstand moisture effects.[fn:1]      | Hygrometry.                                                                |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+|  7 | Shock & Crash safety                     | Mechanical shock. Ensures the item does not become a projectile in a crash.        | Potential for projectile behavior.                                         |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+|  8 | Vibration                                | Vibrations.                                                                        | Normal operation in all vibration scenarios.                               |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+|  9 | Explosion proofness                      | Vacuum + gaseous mixture of combustibles.                                          | The unit must be operable without igniting the environment.                |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+| 10 | Water proofness                          | Dripping water or pooled water.                                                    | Normal operation after exposure.                                           |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+| 11 | Fluids susceptibility                    | Various fluids including carbonated sugared beverages and cleaners/solvents.       | Normal operation after exposure.                                           |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+| 12 | Sand & Dust                              | Blowing sand and dust of specific particle sizes.                                  | Normal operation after exposure.                                           |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+| 13 | Fungus Resistance                        | Fungi under conditions favorable for their development.[fn:3]                      | Fungal proliferation.                                                      |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+| 14 | Salt & Fog                               | Multiple exposures of salt fog and drying; environmentally accelerated corrosion.  | Normal operation after exposure.                                           |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+| 15 | Magnetic effect                          | Magnetic effects on the aircraft's compass.                                        | Normal aircraft compass function.                                          |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+| 16 | Power input                              | Input power emissions, susceptibility, transients, drop-outs, hold-up.[fn:2]       | Voltage, current, phase.                                                   |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+| 17 | Voltage spike                            | Voltage spikes caused by input power.                                              | AC/DC voltage.                                                             |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+| 18 | Audio Frequency Conducted Susceptibility | Frequency components during normal operation.                                      | Power source harmonics.                                                    |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+| 19 | Induced Signal Susceptibility            | Induced voltages in the equipment interconnect circuit configuration.              | power frequency harmonics; audio frequency signals, electrical transients. |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+| 20 | RF emission and susceptibility           | Normal operation on radio frequency emission energy and susceptibility.            |                                                                            |
+| 21 |                                          |                                                                                    |                                                                            |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+| 22 | Lightning susceptibility                 | Direct and indirect effects, depending on location.                                | induced transients in the airframe or wire bundle.                         |
+| 23 |                                          |                                                                                    |                                                                            |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+| 24 | Icing                                    | Icing conditions arising from rapid changes in temperature, altitude and humidity. | Presence of ice.                                                           |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+| 25 | ESD                                      | ESD in handling and operation.                                                     | ESD.                                                                       |
+|----+------------------------------------------+------------------------------------------------------------------------------------+----------------------------------------------------------------------------|
+| 26 | Flammability                             | Normal operation on presenting a fire hazard.                                      | Normal operation not causing a fire.                                       |
+
+
+* Footnotes
+
+[fn:3] This includes high humidity, a warm atmosphere, and the
+presence of inorganic salts.
+
+[fn:2] Full flight mission must be considered, from prior to the
+engine start, to after landing---including emergencies.
+
+[fn:1] Moisture sensitive devices may experience issues with this test
+and require conformal coat or other types of protection.