The main frame of the wing includes spars, ribs, stringers, integral fuel tank structure, tip tank supporting structure and frames around openings.

Make sure that the fuel load is equal on each side of the aircraft centerline.

Text may be prepared in one or two columns with or without justification. Warnings, cautions and notes may be used to highlight or emphasize important points.

During the introductory period of the B747 alone, about 4,000 pages had to be replaced or added to the manual each month.

When the control handle is placed in the DN position, the gear doors open, the gear unlocks and extends and the gear doors close.

For pressurized airplanes and turbo super charged or turbo propeller powered airplanes, the Maximum Altitude Limits shall be stated.

On ground, with hydraulic systems not pressurized, the normal position of the elevators is the droop down position to the servo control stop.

Line Maintenance should be understood as any maintenance that is carried out before flight to ensure that the aircraft is fit for the intended flight.

For ease of reading and cross reference, illustrations, figures and tables should be presented in a vertical layout, if practical.

KNOTS are used throughout to avoid the confusion between knots (KTS) and miles per hour (MPH) in performance charts and tables.

For the Calibration step， the coupler asks the Transceiver for another brief bust of tune power.