Carj diverts for maintenance when EICAS message indicates right reverser unlocked.

Attributes
ACN	773905
Time
Date	200802
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 30000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	Regional Jet 200 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
ASRS Report	773905
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	aircraft equipment other aircraft equipment : eicas wing
Resolutory Action	flight crew : diverted to another airport flight crew : landed as precaution
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

In cruise at FL300; the EICAS system alerted us to a 'right reverser unlocked' master caution message. We noted a small vibration -- buffet at this time; but could not associate it with rough air or a reverser unlocked condition. We ran the QRH for right (left) reverser unlocked message which instructed us to bring the right thrust lever to idle; to press the emergency stow button; and then slowly increase power on the right engine to determine if the reverser was in fact unlocked. It also instructed us to land at the nearest suitable airport. We determined that ZZZ was the nearest suitable airport; and while the captain communicated with ATC; I contacted the flight attendant and let her know we were diverting and to prepare the cabin for arrival (it was communicated that brace position for the passenger were not necessary). I then contacted company dispatch and maintenance via comrdo and informed them of the situation and that we were diverting to ZZZ. We landed at ZZZ without incident; and we were met by contract maintenance; who secured the reverser with pins; and the right reverser was MEL'ed. We continued the flight from ZZZ to our destination without incident.

Original NASA ASRS Text

Title: CARJ DIVERTS FOR MAINT WHEN EICAS MESSAGE INDICATES RIGHT REVERSER UNLOCKED.

Narrative: IN CRUISE AT FL300; THE EICAS SYS ALERTED US TO A 'R REVERSER UNLOCKED' MASTER CAUTION MESSAGE. WE NOTED A SMALL VIBRATION -- BUFFET AT THIS TIME; BUT COULD NOT ASSOCIATE IT WITH ROUGH AIR OR A REVERSER UNLOCKED CONDITION. WE RAN THE QRH FOR R (L) REVERSER UNLOCKED MESSAGE WHICH INSTRUCTED US TO BRING THE R THRUST LEVER TO IDLE; TO PRESS THE EMER STOW BUTTON; AND THEN SLOWLY INCREASE PWR ON THE R ENG TO DETERMINE IF THE REVERSER WAS IN FACT UNLOCKED. IT ALSO INSTRUCTED US TO LAND AT THE NEAREST SUITABLE ARPT. WE DETERMINED THAT ZZZ WAS THE NEAREST SUITABLE ARPT; AND WHILE THE CAPT COMMUNICATED WITH ATC; I CONTACTED THE FLT ATTENDANT AND LET HER KNOW WE WERE DIVERTING AND TO PREPARE THE CABIN FOR ARR (IT WAS COMMUNICATED THAT BRACE POS FOR THE PAX WERE NOT NECESSARY). I THEN CONTACTED COMPANY DISPATCH AND MAINT VIA COMRDO AND INFORMED THEM OF THE SITUATION AND THAT WE WERE DIVERTING TO ZZZ. WE LANDED AT ZZZ WITHOUT INCIDENT; AND WE WERE MET BY CONTRACT MAINT; WHO SECURED THE REVERSER WITH PINS; AND THE R REVERSER WAS MEL'ED. WE CONTINUED THE FLT FROM ZZZ TO OUR DEST WITHOUT INCIDENT.

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.