A B767-200 flight crew encountered a rev (engine reverser not stowed) warning. Visual inspection see...

Narrative:

At approximately XA20Z; FL390 mach .814; the 'reverser' annunciation came on amber over the right N1 display. I was the pilot flying; so I maintained aircraft control; while the captain ran the quick reference handbook 767 'reverser unlocked' checklist contained in pb 757/767. Since there was no yaw; loss of airspeed or buffet; the checklist ended with 'operate the engine normally.' the captain elected to contact maintenance control via a patch through dispatch. Maintenance control advised to look at the engine. The captain sent me back to do this. I reported that the reverser sleeve appeared to be slightly deployed. Based on this information and advice from maintenance control; we decided to land at ZZZ. ATC began giving us vectors to ZZZ. Since the sleeve was in fact deployed; we decided to do the rest of the quick reference handbook checklist which involved shutting down the engine (single engine time was 12 minutes). The checklist also called for a no-slats/flaps 20 degree landing; and that is how we landed. The landing was; of course; fast but otherwise uneventful and not overweight. We taxied normally to the gate. Note: as we slowed after landing; the reverser annunciation went out and on walkaround we found the sleeve fully stowed. After the aircraft was serviced by maintenance and the quick turn around chart was complied with; we departed for ZZZ1.

Original NASA ASRS Text

Title: A B767-200 flight crew encountered a REV (engine reverser not stowed) warning. Visual inspection seemed to indicate partial deployment so they declared an emergency and diverted to the nearest suitable airport.

Narrative: At approximately XA20Z; FL390 Mach .814; the 'Reverser' annunciation came on amber over the right N1 display. I was the Pilot Flying; so I maintained aircraft control; while the Captain ran the Quick Reference Handbook 767 'Reverser Unlocked' checklist contained in PB 757/767. Since there was no yaw; loss of airspeed or buffet; the checklist ended with 'operate the engine normally.' The Captain elected to contact Maintenance Control via a patch through Dispatch. Maintenance Control advised to look at the engine. The Captain sent me back to do this. I reported that the reverser sleeve appeared to be slightly deployed. Based on this information and advice from Maintenance Control; we decided to land at ZZZ. ATC began giving us vectors to ZZZ. Since the sleeve was in fact deployed; we decided to do the rest of the Quick Reference Handbook checklist which involved shutting down the engine (single engine time was 12 minutes). The checklist also called for a no-slats/flaps 20 degree landing; and that is how we landed. The landing was; of course; fast but otherwise uneventful and not overweight. We taxied normally to the gate. Note: as we slowed after landing; the Reverser annunciation went out and on walkaround we found the sleeve fully stowed. After the aircraft was serviced by Maintenance and the Quick Turn Around chart was complied with; we departed for ZZZ1.

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.

Attributes
ACN	826168
Time
Date	200903
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Turbine Reverser
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Commercial Flight Crew Multiengine Flight Crew Private
Experience	Flight Crew Last 90 Days 150 Flight Crew Total 11000 Flight Crew Type 495
Events
Anomaly	Aircraft Equipment Problem Critical

A B767-200 flight crew encountered a rev (engine reverser not stowed) warning. Visual inspection seemed to indicate partial deployment so they declared an emergency and diverted to the nearest suitable airport.