Under the Civil Service Reform Act of 1978 (CSRA), most Federal employees may appeal various personnel actions affecting them to the U.S. Merit Systems Protection Board (MSPB or Board). These actions include removals, suspensions of more than 14 days, reductions in grade or pay, and furloughs of 30 days or less. Other types of actions that may be appealed to the Board include: performance-based removals or reductions in grade, denials of within-grade salary increases, reduction-in-force actions, OPM suitability determinations, OPM employment practices, OPM determinations in retirement matters, denials of restoration or reemployment rights, and terminations of probationary employees under certain circumstances.
You can find a complete list of appealable actions at 5 CFR 1201.3(a). In addition to whistleblowing appeal, there are few other less common scenarios in which a federal employee can appeal to the MSPB. Visit the MSPB's website to learn more.