"This SAE Aerospace Recommended Practice (ARP) establishes the basic recommendations for the following two types of configuration for securing cargo to aircraft passenger seats on transport category aircraft: a. Type 1: Seat bags b. Type 2: Restraint straps are examples of their type and may be adapted to suit the individual needs of the user. It is emphasized that the two types of restraint shown are merely examples of methods currently used and does not imply that alternative methods are not acceptable. For the purposes of this document@ the minimum essential criteria are identified by the use of the key word ""shall."" Recommended criteria are identified by the use of the key word ""should@"" and while not mandatory@ are considered to be of significant importance in providing safe@ economical@ and practical means of cargo restraint. Deviation from recommended criteria should occur only after careful consideration@ extensive testing@ and thorough service evaluation have shown alternative methods to be satisfactory. Field of Application: Of concern to airlines in recent years has been the demands of their marketing organizations to carry cargo in excess of the volumetric limitations of their aircraft's cargo compartments or of a security nature@ such as diplomatic or messenger mail and newspapers in the passenger compartment. Cargo in excess of volumetric cargo compartment limitations generally arises from seasonal demands and consists mainly of mail@ flowers@ etc.@ whereas newspapers@ messenger@ and diplomatic mail occur at regular intervals throughout the year. The latter is of a special nature requiring observance until delivered and is usually deemed unacceptable to be loaded into cargo holds even though lockable stowages may be provided there. A further concern arises in that the cargo is mostly ""one-way"" traffic. That is@ it is carried on@ say@ the outward sector but not on the return sector. Equally@ the passenger load demands on the return sector often demand that full use is made of the cabin seating@ and that space cannot be released for the placement of cabin bins unless passenger load factors are reduced or there is insufficient time to effect the configuration change necessary. Discussion: In many cases@ cargo of a rigid sizeable nature can safely be restrained in or under passenger seats or between seats by conventional methods using rope@ straps@ and seat track tie-down fittings. However@ there is a range of loads which are of multisizes or of a nonrigid natures@ which cannot be restrained safely by such conventional methods or require an excessive amount of time to produce a satisfactory restraint condition. A general category of this type of load would be mailbags. Moreover@ conventional methods of restraint@ particularly using ropes@ cause damage to seating@ which results in unnecessary maintenance and presents an unacceptable appearance to passengers. A number of methods have been used by airlines to deal with restraint problems which require the carriage of dead load in passenger cabins and where it is unacceptable to remove passenger seats."