  The trajectory of an interplanetary spacecraft can be used to test
gravitation in the Solar System. Its determination relies on radio tracking and
is limited by the uncertainty on the spacecraft non-gravitational acceleration.
The addition of an accelerometer on board provides another observable which
measures the departure of the probe from geodesic motion. Such a concept has
been proposed for the OSS mission which embarks the Gravity Advanced Package.
This instrument, which is the focus of this article, is designed to make
unbiased acceleration measurements.
