Spline Misalignment Gaging System for Engine Accessory Gearboxes and Accessories.

The objective of this program was to design and fabricate a gaging system for measureing the aircraft engine accessory gearbox-to-spline and accessory-to-spline misalignments. This gaging system comprises, in essence, a gearbox spline misalignment gage, an accessory spline misalignment gage, and a control module containing an amplifier, an indicator, and a recorder. Several sets of the gearbox and accessory spline misalignment gages are required to fill all the current AND and MS Standard gearbox and accessory pads. In this program, a popular pad size was selected for initial development. The specific gearbox spline misalignment gage was designed for use on gear-box pads with a pilot diameter of 4.125 in. and a bolt circle diameter of 5 in. AND 20002, and 20007, and MS 3327. The specific accessory spline misalignemnt gage was designed to fit the mating accessory pads with a pilot diameter of 4.122 in. AND 10262, AND 10267, and MS 3332. The control module was designed as a general-purpose component, suitable for use with either one of the two gages for the specific pad size chosen, as well as for other gages which may be fabricated for other pad sizes in the future. A letter to Commander, Naval Air Systems Command which describes an operational evaluation of this gage is provided at the end of this report. Author