Summary
The FAA proposes to adopt a new airworthiness directive (AD) for certain Gulfstream Aerospace LP Model Gulfstream 100 airplanes; and Model Astra SPX and 1125 Westwind Astra series airplanes. This proposed AD would require adjusting the ground contact switches of the main landing gear. This proposed AD is prompted by two occurrences of uncommanded deployments of the ground airbrakes during descent. We are proposing this AD to prevent a false "Ground" position signal, which could result in deployment of the ground airbrakes and reduced controllability of the airplane.