Class 1 aircraft require weight and moment record documentation, but they do not require loading control for normal configurations. Normal configurations are defined as configurations on aircraft that have previously been flown, and the weight, structural, and/or center of gravity limits cannot be exceeded.

Class 2 aircraft are those aircraft that require basic weight and moment documentation and loading control to ensure that loading arrangements do not exceed the permissible weight, structural, and/or center of gravity limits.

All aircraft must be weighed upon completion of SDLM. Aircraft must also be weighed under each of the following conditions:

When changes, modifications, or repairs are accomplished and calculated or actual weight and moment data for these changes are not available.

When recorded weight and balance data is suspected of being in error.

When unsatisfactory flight characteristics are reported by the pilot, and these characteristics cannot be traced to flight control system malfunction, improper aircraft loading, or errors in weight and balance data and/or computations.

When weight and balance handbook has been lost or damaged. (A new record must be promptly prepared.)

WEIGHT AND BALANCE HANDBOOK

The Weight and Balance Data, NA 01-1B-40, is a technical manual that provides activities with a standard system of weight and balance control. It contains brief, instructive information. It is placed in a permanent binder for forms and charts, which provide a continuous record and control of weight and balance of aircraft.

A weight and balance handbook is maintained for each assigned aircraft. The handbook charts, forms, and records should be maintained in accordance with the requirements and instructions given in NA 01-1B-40 and NA 01-1B-50,

Class 1 aircraft weight and balance handbooks are stored as directed by your particular activity. Class 2 weight and balance handbooks are also stored as directed by your particular activity; however, they must be stored in a location that is readily available to the pilot and other personnel responsible for weight and balance functions. EXCEPT WHEN BEING TRANSFERRED, HANDBOOKS ARE NEVER STORED ON AIRCRAFT.

The contents of the weight and balance handbooks are arranged and maintained in the following order:

1. NA 01-1B-40, with completed title page

2. Record of Weight and Balance Personnel Form

Figure 6-21.- Chart A - Basic Weight Check List Record.