Only when both manufacturer and operator do their job can remain an entire fleet of airplanes continuously airworthy.

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.

The check list should be limited to the minimum number of items determined to be essential to aid the pilot in an emergency.

Other Limitations provide a statement of any limitation required by regulation or permitted or approved by the regulatory authority, not specifically covered in this Section.

Open communication should exist with the operator telling the manufacturer as soon as some new kind of situation arises and the manufacturer responding back with solid help to the operators.

All official technical names that have more than three nouns are written in full the first time that they occur.Then, in the remaining parts of the text, the related approved abbreviations are used.

If the airplane has a built-in auxiliary power unit, describe it and explain how it fits in with the electrical system.