Citation X (C750)
Flight Crew Air Transport Pilot (ATP)
Confusion; Troubleshooting
Aircraft Equipment Problem Critical; Ground Event / Encounter Other / Unknown
General Maintenance Action
Human Factors; Environment - Non Weather Related; Aircraft; Manuals; Procedure
Pitch forces were higher than normal while airborne. During all three days of flying the plane. It had been written up two times before. Once 'Ops checks good' and once for a relay change. The reason I wrote it up while in fear of being called in for a bad write up; was during landing roll when Thrust Reversers were deployed the nose wheels rose up off the ground with my normal heavy nose down push on the yoke. That deeply concerned me.Now; after following our maintenance program aircraft information for a few days of trouble shooting; I'm more concerned that technicians think the left elevator is malfunctioning and not sending any type of EICAS message due to a possible ground. I also read that the problem may have started after a Service Bulletin had been accomplished. I'm worried that this is an issue on other CE-750 as I think I have encountered heavy pitch forces on other planes in the fleet. Recommend to advise Operations and maintenance to have pilots report their suspicions of this problem. And or have maintenance check the elevator during service checks.
Reporter stated when the nose wheels rose off the ground during the landing roll; he immediately stowed the reversers and used braking to stop the aircraft. That was the third write-up he made for the same CE-750 aircraft. On the ground the flight controls feel fine; but the pitch forces feel strange and extremely heavy during rotation. The artificial pitch feel may be coming on too soon; or one of the elevator Power Control Unit's (PCUs) may be weaker and does not keep up with elevator input commands. Maintenance did find loose connections in a Junction Box; but he does not know what system the connections affected. The Service Bulletin (S/B) he referenced involved electrical wiring; of what he's not sure of; but Maintenance would have more information. He has not flown any CE-750 aircraft that felt that heavy since. Much of their Maintenance is performed by contract Maintenance vendors.
Pilot reports pitch forces on a Cessna CE-750 aircraft higher than normal when airborne. Although concerned about being called into office for making a repeat write-up; pilot notes that during landing roll when thrust reversers were deployed and with normal heavy nose down push on the yoke; the nose wheels rose off the ground. Maintenance believes left elevator is malfunctioning and not sending any type of EICAS message due to a possible electrical ground.