G200 flight crew reported deviating to an alternate airport after experiencing pitch oscillation ano...

Attributes
ACN	1752050
Time
Date	202006
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Gulfstream G200 (IAI 1126 Galaxy)
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Elevator
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

The crew performed a normal departure and a normal climb out to FL410 and a cruise speed of .78m. Approximately 10 minutes after level off at FL410; we experienced a slight pitch oscillation in conjunction with an amber elevator (east) indication on the pfd. The oscillation continued; trending in a climbing pitch attitude of about 2-3 degrees nose up and a red elevator (east) indication on the pfd. I disconnected the autopilot to regain control of the pitch instability and began to detect an electrical smoke odor. No smoke was visible; but the odor persisted. The passengers also detected the odor; which dissipated within a few minutes. We elected to [request priority handling] and notified ATC that we would be turning toward the shoreline and requested vectors to the nearest suitable airport. After our initial turn and descent were established; and while continuing to hand fly; the aircraft began to vibrate and rumble for approximately 3-5 seconds. This prompted me to pull the throttles back and slow from our normal descent speed of .78m or 300 kts. To about 250 kts. We were then cleared to FL220 and given a clearance direct to ZZZ. A normal descent; approach; and landing were performed and the aircraft was landed safely without further incident.

Original NASA ASRS Text

Title: G200 flight crew reported deviating to an alternate airport after experiencing pitch oscillation anomalies and an amber elevator indication in cruise flight at FL410.

Narrative: The crew performed a normal departure and a normal climb out to FL410 and a cruise speed of .78m. Approximately 10 minutes after level off at FL410; we experienced a slight pitch oscillation in conjunction with an amber elevator (E) indication on the PFD. The oscillation continued; trending in a climbing pitch attitude of about 2-3 degrees nose up and a red elevator (E) indication on the PFD. I disconnected the autopilot to regain control of the pitch instability and began to detect an electrical smoke odor. No smoke was visible; but the odor persisted. The passengers also detected the odor; which dissipated within a few minutes. We elected to [request priority handling] and notified ATC that we would be turning toward the shoreline and requested vectors to the nearest suitable airport. After our initial turn and descent were established; and while continuing to hand fly; the aircraft began to vibrate and rumble for approximately 3-5 seconds. This prompted me to pull the throttles back and slow from our normal descent speed of .78m or 300 kts. to about 250 kts. We were then cleared to FL220 and given a clearance direct to ZZZ. A normal descent; approach; and landing were performed and the aircraft was landed safely without further incident.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.