These cutout switches operate cutout valves, which are part of the stabilizer trim control modules, to isolate hydraulic power to stabilizer trim components in the tail.

If you do not do a regular monitoring of the APU oil consumption, do the steps that follow to make sure that the APU oil quantity is sufficient for the flight.

Warning: Before you close the hatch, make sure that no persons are in the crew rest compartment. When the hatch is closed, there is no airflow to the compartment and there is a risk of suffocation.

Differences in design and complexity of the various types and models of airplanes play a major role in deciding whether a specific malfunction is more appropriately listed under "emergency" or "abnormal" procedures.

Those airborne power plants are installed on the aircraft for the purpose of generating and supplying a single type or combination of auxiliary electric, hydraulic, pneumatic or other power.

If a pronoun can refer to one or more nouns in a text, it can make a sentence ambiguous. If a sentence is ambiguous, replace the pronoun with the word that it refers to. This will make the sentence clear and easier to read.

The purpose of the spoilers is to disturb the smooth airflow across the top of the airfoil thereby creating an increased amount of drag and a decreased amount of lift on that airfoil.

Basically, it is a guide to industry standardization of proven concepts to be presented in a form most useful to pilots.

Adjectives that make their comparative and superlative forms with “more” and “most” do not have these forms listed in the dictionary, because “more” and “most” are also listed as approved words.

However, when a point is reached where the accumulated revisions make distribution ,filing and use of the manual difficult , a reissue is warranted.

The Introduction Section of the Maintenance Manual should contain either a list of vendor publications or refer to the location of such lists whether they are included in system descriptions or provided in separate documents.