A be-90 captain reported experiencing jammed electric elevator trim which led to an altitude deviati...

Attributes
ACN	883658
Time
Date	201004
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	King Air C90 E90
Operating Under FAR Part	Part 135
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Elevator Trim System
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor
Experience	Flight Crew Last 90 Days 25 Flight Crew Total 7070 Flight Crew Type 195
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance

Narrative:

Aircraft in level flight on autopilot. Continuous light to moderate turbulence. Electric elevator trim malfunctioned (jammed). When trim system was disengaged nose pitched suddenly causing abrupt pitch and altitude change. No complaints from approach. No loss of aircraft separation. Manual trim worked normally. Electric trim seemed to be normal. ATC cleared aircraft for several altitude changes (climb). Re-engaged autopilot approximately 10 minutes after first trim malfunction. Electric elevator trim malfunctioned a second time causing abrupt pitch and altitude change. ATC reported seeing aircraft 200 feet high. Crew acknowledged and returned to cleared altitude. No loss of aircraft separation was reported. Remainder of flight accomplished without autopilot or electric elevator trim usage.

Original NASA ASRS Text

Title: A BE-90 Captain reported experiencing jammed electric elevator trim which led to an altitude deviation. Remainder of flight flown without autopilot and electric elevator trim.

Narrative: Aircraft in level flight on autopilot. Continuous light to moderate turbulence. Electric elevator trim malfunctioned (jammed). When trim system was disengaged nose pitched suddenly causing abrupt pitch and altitude change. No complaints from Approach. No loss of aircraft separation. Manual trim worked normally. Electric trim seemed to be normal. ATC cleared aircraft for several altitude changes (climb). Re-engaged autopilot approximately 10 minutes after first trim malfunction. Electric elevator trim malfunctioned a second time causing abrupt pitch and altitude change. ATC reported seeing aircraft 200 feet high. Crew acknowledged and returned to cleared altitude. No loss of aircraft separation was reported. Remainder of flight accomplished without autopilot or electric elevator trim usage.

Data retrieved from NASA's ASRS site as of April 2012 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.

A be-90 captain reported experiencing jammed electric elevator trim which led to an altitude deviation. Remainder of flight flown without autopilot and electric elevator trim.