Gauges used to indicate lower pressures use a more flexible tube that uncoils and coils more readily.

The airflow passes turbine and depletes energy，in addition to the colder air bypassed the engine core, produces a force when exiting the nozzle that acts to propel the engine,and therefore the airplane, forward.

The engine anti-icing system is used to eliminate and prevent the formation of ice by bleed air in all parts of engine, excluding power plant cowling which is covered under Chapter 30.

The emergency procedures check list should be in concise, abbreviated form designed to remind pilots of items to check without providing details concerning the operation of any system.

Definitions should be worded as simply as possible and must conform with the use of the defined terms in the Handbook.

If the wheel temperature increases to more than 177 deg., the core of the fusible plug melts and the tire deflates.

The material within subparagraphs of Handbooks may follow the order of material within subparagraphs of this Section of the Specification or may be arranged to suit a particular type or model of airplane.

An "emergency" however, almost always involves a failure that requires immediate and rapid response, such as a total powerplant failure, fire or smoke, or rapid cabin decompression.

Emergency Procedures and other pertinent information necessary for safe operations shall be provided for emergencies peculiar to a particular airplane design, operating or handling characteristics.

The procedures shall clearly describe the step-by-step operation in a logical work flow sequence as necessary to gain access to and subsequently remove the hardware or install the hardware.

Environmental systems include those units and components which furnish a means of pressurizing, heating, cooling, moisture controling, filtering and treating the air used to ventilate the areas of the fuselage within the pressure seals.