Commuter jet crew reported that the primary pitch trim system become inoperative.

Attributes
ACN	559495
Time
Date	200209
Day	Mon
Place
Locale Reference	airport : ord.airport
State Reference	IL
Aircraft 1
Controlling Facilities	tracon : c90.tracon
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : multi engine pilot : instrument
ASRS Report	559495
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	aircraft equipment other aircraft equipment : eicas pitch trim i inop msg other flight crewa other flight crewb
Resolutory Action	other
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On descent into ord, we were presented with a pitch trim 1 inoperative EICAS message with a triple chime. The autoplt was on and the captain was the PF. We followed the procedure in the aom. Neither the captain's nor the first officer's yoke trim switches were actuating the trim, but the standby trim did work. We continued for a normal landing in ord.

Original NASA ASRS Text

Title: COMMUTER JET CREW RPTED THAT THE PRIMARY PITCH TRIM SYS BECOME INOP.

Narrative: ON DSCNT INTO ORD, WE WERE PRESENTED WITH A PITCH TRIM 1 INOP EICAS MESSAGE WITH A TRIPLE CHIME. THE AUTOPLT WAS ON AND THE CAPT WAS THE PF. WE FOLLOWED THE PROC IN THE AOM. NEITHER THE CAPT'S NOR THE FO'S YOKE TRIM SWITCHES WERE ACTUATING THE TRIM, BUT THE STANDBY TRIM DID WORK. WE CONTINUED FOR A NORMAL LNDG IN ORD.

Data retrieved from NASA's ASRS site as of July 2007 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.