420. The additional information may be imparted to existing employees through the recurrent training requirements

2943. The manufacturer may establish procedures to provide feedback( )on unairworthy conditions( )that were discovered when complying

2942. All publications shall use the standard numbering system for indexing and assignment of subject matter prescribed in this specification even though all chapters may not be applicable to the aircraft or to the publication

2941. To prevent the friction, polish the surface

2940. Relatively simple units may not require description and operation, and/or troubleshooting information

2939. Replace the slide valve if its surface is rough

2938. Put the removed part on a clean surface

2937. Hold the airspeed indication at the same value for 2 minutes

2936. Print the page number and date of issue or revision at the bottom of each page

2935. For small or relatively non complex airplanes, an abbreviated indexing method may be used

2934. 确保襟翼位置对称。