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SAE AIR4204 1991 Edition, January 29, 1991
Commercial Aircraft Auxiliary Power Unit Installations
Description / Abstract:
This Aerospace Information Report (AIR) reviews the factors to be
considered in determining the
location and arrangement for auxiliary power unit (APU) installations
for airborne applications and
reviews requirements for flight suitability.
As treated in this discussion, the APU normally includes a power section (or engine), a starting system, an electronic control unit (ECU), a gearbox with accessory mounting pads, and an oil cooling system. The accessories that are driven by the APU, such as CSD's (constant speed drives), alternating current (AC) generators, hydraulic pumps, or air compressors, are not covered here except insofar as they make demands on the APU. The various installation components and systems that are covered here are outlined by the table of contents.
Turbine-type APU's are by far the most highly developed and universally used airborne units, so their installation will dominate the discussion in this document. And, though there have been some APU's developed for military applications, many military transports are adaptations of commercial carrier aircraft. The bulk of the discussion will, therefore, be oriented toward APU installation requirements as developed by the civilian sector. Discussions of the internal design aspects of the APU itself are not within the scope of this document.
The purpose of this document is to aid APU installation designers by assuring that no important design aspect of the installation will be overlooked. References 2.1 and 2.2 are also documents published by APU manufacturers for this purpose. Reference 2.3 is a useful design handbook published by the U.S. Air Force.
As treated in this discussion, the APU normally includes a power section (or engine), a starting system, an electronic control unit (ECU), a gearbox with accessory mounting pads, and an oil cooling system. The accessories that are driven by the APU, such as CSD's (constant speed drives), alternating current (AC) generators, hydraulic pumps, or air compressors, are not covered here except insofar as they make demands on the APU. The various installation components and systems that are covered here are outlined by the table of contents.
Turbine-type APU's are by far the most highly developed and universally used airborne units, so their installation will dominate the discussion in this document. And, though there have been some APU's developed for military applications, many military transports are adaptations of commercial carrier aircraft. The bulk of the discussion will, therefore, be oriented toward APU installation requirements as developed by the civilian sector. Discussions of the internal design aspects of the APU itself are not within the scope of this document.
The purpose of this document is to aid APU installation designers by assuring that no important design aspect of the installation will be overlooked. References 2.1 and 2.2 are also documents published by APU manufacturers for this purpose. Reference 2.3 is a useful design handbook published by the U.S. Air Force.
SAE AIR4204 1991 Edition, January 29, 1991
Commercial Aircraft Auxiliary Power Unit Installations