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# Rules Sec 2

> **Source:** ASD-STE100 Issue 9, January 2025
> **Section:** RULES (2)
> **Pages:** 60-63 of 434 (4 pages)

# Page 60 of 434

To keep multi-word nouns short, you can use prepositions (for example, "of," "on," "in," and "for") and explain the multi-word nouns.

#### Examples

> **Non-STE:** _Runway light connection resistance calibration._ (5 words)
>
> **STE:** Calibrationof theresistanceof therunway light connection. (1 word, 1 word, and 3 words)
>
> **Non-STE:** _Install the forward turbine overheat thermocouple terminal tags._ (6 words)
>
> **STE:** Install theterminal tagson theforward overheat thermocouple of the turbine. (2 words and 3 words)
>
> **Non-STE:** _Remove theengine transmission housing attachment bolts._ (5 words)
>
> **STE:** Remove theboltsthatattachthetransmission housingto theengine. (1 word, 1 word, 2 words, and 1 word)
>
> **Non-STE:** _Adjust to obtaindoor operating rod alignmentwith the attachment point. (4 words)_
>
> **STE:** Adjust thedoor operating roduntil italignswith the attachment point. (3 words and 1 word)

### Rule 2.2 When a technical noun has more than three words, write it in full.

When a technical noun has more than three words, write it in full. Then, you can use one of these methods to make the technical noun clear:

- Give a shorter form of the technical noun.
- Use hyphens (-) between words that you use as one unit.

A long multi-word noun can be a long technical noun, or it can be a combination of shorter technical nouns. Frequently, it is not possible to divide technical nouns into smaller parts because they are the technical nouns that your company, industry, or subject field uses. Thus, you must write technical nouns as they are, in their approved form.

#### Method 1 - Shorter form of technical nouns

If a long technical noun comes from an official document (for example, an engineering drawing or an illustrated parts catalog), write it in full the first time that it occurs in the text. Then, if it is possible, explain the technical noun and in the remaining text of your document, use a shorter form or an approved abbreviation.

#### Examples in STE

<mark>Before you do this procedure, engage the ramp service door safety connector pin (the pin that</mark> hold the ramp service door, referred to in this procedure as the "safety connector pin".

In this example, you write "ramp service door safety connector pin" in full. Then, after an explanation, you give a shorter technical noun: "safety connector pin." This shorter technical noun has three words and obeys rule 2.1.

# Page 61 of 434

> <mark>The Main Fuel Metering Unit (MFMU) is an aluminum alloy unit that includes a Main Engine Control Unit (MECU) and a Distribution Block (DB). The MFMU is installed in the engine bypass duct and operates in the engine fuel system. The function of the MFMU is to meter and supply the fuel from the Main Engine Fuel Pump (MEFP) to the fuel manifolds and the starter jets. The Digital Engine Control Unit (DECU) sends electrical signals to operate the MFMU. </mark>

In this example, the explanation is not necessary because the text gives all the necessary information about the unit. You write all official technical nouns that include more than three nouns in full the first time that they occur. Then, in the remaining parts of the text, you use their related approved abbreviations.

If an approved technical noun includes three words or less, it is not necessary to use abbreviations.

#### Example

| Do not write: | WRITE: |
|---|---|
| The primary parts of the valve are: - The DA (8) - The PVA (15) - The BA (17) - The VB (20). | A. Remove the diaphragm assembly (8) from the valve body (20). B. Remove the poppet valve assembly (15) from its seat. C. Remove the bush assembly (17) from the valve body (20). |

You can use abbreviations that come from your official company documentation but be careful. A text full of abbreviations in a procedure, although shorter, is not easy to read.

#### Example

| Do not write: | WRITE: |
|---|---|
| A. Remove the DA (8) from the VB (20). B. Remove the PVA (15) from its seat. C. Remove the BA (17) from the VB (20). | A. Remove the diaphragm assembly (8) from the valve body (20). B. Remove the poppet valve assembly (15) from its seat. C. Remove the bush assembly (17) from the valve body (20). |

# Page 62 of 434

#### Method 2 - Hyphens (-) between the words that you use as one unit

A hyphen is a punctuation mark that connects words or parts of words. You can use hyphens between words to show how related words operate as one unit. This method will make the multi-word nouns that you use agree with rule 2.1. Hyphenated words always count as one word.

##### Examples in STE

| Example | Note |
|---|---|
| Make sure that thecutoff-switch power connectionis safe. | (3 words) |
| Inspection of thelavatory rapid-decompression device. | (3 words) |

Make sure that you do not connect words which are not related, because this hyphen will change the meaning of the multi-word noun. If you are not sure, only explain the multi-word noun. Then, use a shorter form, or an official approved abbreviation.

If an approved technical noun includes hyphens, do not change it. If it is too long, write it in full the first time it occurs and then use the recommended method (shorter technical nouns) specified in this rule.

Do not use hyphens to make groups of more than three words. If you use hyphens for all the words, this multi-word noun will not be easy to read and understand.

##### Example

> **Non-STE:** Move the main-gear-door-retraction-winch handle. (2 words, but not correct)
>
> **STE:** Move the main-gear-door retraction-winch handle. (3 words)

If an approved technical noun includes three words or less (for example "poppet valve assembly" and "diaphragm assembly"), it is not necessary to use hyphens.

##### Example

| Do not write: | WRITE: |
|---|---|
| A. Remove the diaphragm-assembly (8) from the valve body (20). B. Remove the poppet-valve assembly (15) from its seat. | A. Remove the diaphragm assembly (8) from the valve body (20). B. Remove the poppet valve assembly (15) from its seat. |

But, if an approved technical noun includes a hyphen (for example "inward-outward valve"), do not remove the hyphen. Keep the technical noun that comes from your official company documentation.

##### Example

> **Non-STE:** <u><mark>Do not write: The inward outward valve is part of the fuel system.</mark></u>
>
> **STE:** <mark>WRITE: The inward-outward valve is part of the fuel system.</mark>

# Page 63 of 434

## Section 3 - Verbs

| Verb form | Summary of the rules |
|---|---|
| Rule 3.1 | Use only the verb forms that are given in the dictionary. |
| Rule 3.2 | Use only these verb forms and tenses of verbs: - The infinitive form - The imperative form (command form) - The simple present tense - The simple past tense - The simple future tense - The past participle form (as an adjective) |
| Rule 3.3 | Use the past participle form as an adjective. |
| Rule 3.4 | Do not use auxiliary verbs to make complex verb constructions. |
| Rule 3.5 | Use the "-ing" form of a verb only as a technical noun or as a modifier in a technical noun. |
| Rule 3.6 | Active voice: Use the active voice. In descriptive writing, you can use the passive voice only when the agent is unknown. |
| Rule 3.7 | How to describe an action: Use an approved verb to describe an action, not a noun or other parts of speech. |

### Verb forms and tenses of verbs

### Rule 3.1 Use only the verb forms that are given in the dictionary.

The STE dictionary gives you the verb forms that you can use for each approved verb.

#### Example

**<mark>REMOVE (v) REMOVES, REMOVED, REMOVED</mark>**

**<mark>GIVE (v) GIVES, GAVE, GIVEN</mark>**
