<< >> NASA ASRS Report 943883, April 2011

An lj-31 captain disconnected the autopilot and recovered to their cleared altitude following a hardover input during level off.

Attributes
ACN	943883
Time
Date	201104
Local Time Of Day	0601-1200
Place
Locale Reference	ZDC.ARTCC
State Reference	VA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Learjet 31
Operating Under FAR Part	Part 135
Flight Phase	Descent
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Autopilot
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Engineer
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 27000 Flight Crew Type 4500
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Altitude Excursion From Assigned Altitude Deviation - Altitude Overshoot

Narrative:

[We] were given an enroute descent to cross dilnn at FL330. As we started to have automatic level off by autopilot; the autopilot did a 'hard over' and we descended another 700 ft at 2;000 plus FPM. Autopilot was uncoupled and immediate climb restored aircraft to FL330. No other planes were near-by. TCAS was not activated.

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Original NASA ASRS Text

Title: An LJ-31 Captain disconnected the autopilot and recovered to their cleared altitude following a hardover input during level off.

Narrative: [We] were given an enroute descent to cross DILNN at FL330. As we started to have automatic level off by autopilot; the autopilot did a 'hard over' and we descended another 700 FT at 2;000 plus FPM. Autopilot was uncoupled and immediate climb restored aircraft to FL330. No other planes were near-by. TCAS was NOT activated.

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.