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SAE ARP4776 1994 Edition, March 1, 1994
Pallet/Container Loader Auto-Levelling Systems
Description / Abstract:
The data in this document is, at this stage, primarily concerned with the interface of pallet/container loaders and lower-deck compartments of standard and wide-body aircraft although the principles illustrated may be applied to the main-decks of narrow and wide-body aircraft.
NOTE: For the purpose of this document, in accordance with Part 3 of the Directives for the technical work of ISO and with accepted IATA practice. minimum essential criteria defined by the word "shall" are absolute requirements. Recommended criteria identified by the word "should", while considered important, are not mandatory.
Purpose:
Although auto-level systems for lower-deck loaders have been in existence for some years, the problem of damage to aircraft due to movement of incorrectly aligned U LO equipment has not been resolved.
Mechanical hook-on levelling systems had a mixed reception and, to some extent, caused as much damage as they were intended to prevent, albeit in different areas.
Whether damage is due to the shortcomings of auto-level systems or inability of personnel to use the systems correctly may be debated but it is clear that misalignment of loader and door-sill remains an industry problem.
The central objective of this document is to promote, by providing critical parameters, the development of international compatibility of auto-levelling systems.
A further objective is to address two (2) further standards. The first being required for the location and installation of targets and/or sensing devices on aircraft compartment door-sills and the second to cover the sensing and control capability of the installation on the pallet loader.
Field of Application:
In line with current practice, a general assumption is that the systems described in this document apply to a 'double-platform' loader where the height of the front platform (bridge) is adjusted by hydraulic or mechanical power.
NOTE: For the purpose of this document, in accordance with Part 3 of the Directives for the technical work of ISO and with accepted IATA practice. minimum essential criteria defined by the word "shall" are absolute requirements. Recommended criteria identified by the word "should", while considered important, are not mandatory.
Purpose:
Although auto-level systems for lower-deck loaders have been in existence for some years, the problem of damage to aircraft due to movement of incorrectly aligned U LO equipment has not been resolved.
Mechanical hook-on levelling systems had a mixed reception and, to some extent, caused as much damage as they were intended to prevent, albeit in different areas.
Whether damage is due to the shortcomings of auto-level systems or inability of personnel to use the systems correctly may be debated but it is clear that misalignment of loader and door-sill remains an industry problem.
The central objective of this document is to promote, by providing critical parameters, the development of international compatibility of auto-levelling systems.
A further objective is to address two (2) further standards. The first being required for the location and installation of targets and/or sensing devices on aircraft compartment door-sills and the second to cover the sensing and control capability of the installation on the pallet loader.
Field of Application:
In line with current practice, a general assumption is that the systems described in this document apply to a 'double-platform' loader where the height of the front platform (bridge) is adjusted by hydraulic or mechanical power.
SAE ARP4776 1994 Edition, March 1, 1994
Pallet/Container Loader Auto-Levelling Systems