Summary
The FAA proposes to adopt a new airworthiness directive (AD) for certain Bombardier, Inc., Model BD-100-1A10 airplanes. This proposed AD was prompted by uncommanded horizontal stabilizer motion during several in-service events caused by a problem with the trim switch wiring. This proposed AD would require installing the pitch/roll trim switch relays. The FAA is proposing this AD to address the unsafe condition on these products.