Beech 400 suffers altitude deviation and loss of separation when pitch trim fails at FL240.

Attributes
ACN	812595
Time
Date	200811
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : atl.airport
State Reference	GA
Altitude	msl single value : 24000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : ztl.artcc
Operator	general aviation : personal
Make Model Name	Beechjet 400
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : ztl.artcc
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 110 flight time total : 6200 flight time type : 1100
ASRS Report	812595
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to assigned altitude
Miss Distance	vertical : 1000
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Level at FL240 and other aircraft at FL250; we experienced pitch trim failure. Climbed 500-600 ft; full forward deflection on yoke. Reduced power and went to emergency trim override. Recovered.

Original NASA ASRS Text

Title: BEECH 400 SUFFERS ALTITUDE DEVIATION AND LOSS OF SEPARATION WHEN PITCH TRIM FAILS AT FL240.

Narrative: LEVEL AT FL240 AND OTHER ACFT AT FL250; WE EXPERIENCED PITCH TRIM FAILURE. CLBED 500-600 FT; FULL FORWARD DEFLECTION ON YOKE. REDUCED PWR AND WENT TO EMER TRIM OVERRIDE. RECOVERED.

Data retrieved from NASA's ASRS site as of May 2009 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.