B757 flight crew has a thrust reverser unlock light during takeoff and climb; diverts and lands.

Attributes
ACN	721358
Time
Date	200612
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	721358
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : tr unlock light other flight crewa other flight crewb
Resolutory Action	flight crew : landed as precaution flight crew : diverted to another airport other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On takeoff we got a right thrust reverser unlock light. No adverse yaw; but light would not go out. Since we were going to ZZZZ1 we didn't think it wise to continue. We landed back at ZZZ with no reverse needed. We did not declare an emergency because everything seemed fine. But after a very smooth landing we realized we were overweight by 12000 pounds. We taxied to the gate with no incident.

Original NASA ASRS Text

Title: B757 FLT CREW HAS A THRUST REVERSER UNLOCK LIGHT DURING TKOF AND CLB; DIVERTS AND LANDS.

Narrative: ON TKOF WE GOT A R THRUST REVERSER UNLOCK LIGHT. NO ADVERSE YAW; BUT LIGHT WOULD NOT GO OUT. SINCE WE WERE GOING TO ZZZZ1 WE DIDN'T THINK IT WISE TO CONTINUE. WE LANDED BACK AT ZZZ WITH NO REVERSE NEEDED. WE DID NOT DECLARE AN EMER BECAUSE EVERYTHING SEEMED FINE. BUT AFTER A VERY SMOOTH LNDG WE REALIZED WE WERE OVERWT BY 12000 LBS. WE TAXIED TO THE GATE WITH NO INCIDENT.

Data retrieved from NASA's ASRS site as of January 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.