Narrative:

Maintenance deferred both thrust reversers. After being deiced with type 1 fluid the crew departed. On climb out passing through approximately 13;000 ft and approximately 270 knots the aircraft developed an airframe vibration. There were no abnormal cockpit indications. As the crew continued to climb and accelerated the vibration seemed to get worse. Climbing through approximately FL260 the crew decide to return to FL240 and maintain a speed of 250 knots or less in case the vibration was caused by an issue with a gear door. The crew coordinated this with center. The crew discussed the issue that at that airspeed and altitude the aircraft did not have the range to make [the destination] as originally planned.PIC contacted flight control and maintenance control via arinc to inform them of the situation; enlist their help in determining the safest course of action; and determine what airport to use as an alternate. After analyzing the situation with all available resources; the crew determined it was safe to continue flight at a lower altitude and a speed lower than the landing gear extended limit speed (vle) of 250 KIAS. The group determined that the best alternate airport for the situation was ZZZ. At this point the crew informed ATC of their plans to divert and [advised of a] possible landing gear or other door issue. Crash/fire/rescue services were requested as a precaution. Enroute to [the diversion airport]; sic went into the cabin and looked out the windows to confirm that the flaps were retracted and the speed brakes were properly stowed. All visual indications showed the flaps up and speed brakes retracted. The descent and approach were normal and the landing was smooth and successful with no issues. After parking aircraft; the crew conducted a post flight inspection and found the bottom portion of the right thrust reverser had deployed approximately 1/2 inch on the inboard side. Crew believes this to be cause of vibration experienced. There were no thrust reverser or any other abnormal indications with the instruments or annunciators. Again; it should be noted the thrust reversers were deferred and placed on the MEL the previous night. This was the first flight after a maintenance event.

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Original NASA ASRS Text

Title: C560XL flight crew reported significant vibrations during climb; seemingly from a partially deployed reverser; that required a diversion.

Narrative: Maintenance deferred both thrust reversers. After being deiced with Type 1 fluid the crew departed. On climb out passing through approximately 13;000 ft and approximately 270 knots the aircraft developed an airframe vibration. There were no abnormal cockpit indications. As the crew continued to climb and accelerated the vibration seemed to get worse. Climbing through approximately FL260 the crew decide to return to FL240 and maintain a speed of 250 knots or less in case the vibration was caused by an issue with a gear door. The crew coordinated this with Center. The crew discussed the issue that at that airspeed and altitude the aircraft did not have the range to make [the destination] as originally planned.PIC contacted flight control and maintenance control via ARINC to inform them of the situation; enlist their help in determining the safest course of action; and determine what airport to use as an alternate. After analyzing the situation with all available resources; the crew determined it was safe to continue flight at a lower altitude and a speed lower than the landing gear extended limit speed (VLE) of 250 KIAS. The group determined that the best alternate airport for the situation was ZZZ. At this point the crew informed ATC of their plans to divert and [advised of a] possible landing gear or other door issue. Crash/Fire/Rescue services were requested as a precaution. Enroute to [the diversion airport]; SIC went into the cabin and looked out the windows to confirm that the flaps were retracted and the speed brakes were properly stowed. All visual indications showed the flaps up and speed brakes retracted. The descent and approach were normal and the landing was smooth and successful with no issues. After parking aircraft; the crew conducted a post flight inspection and found the bottom portion of the right thrust reverser had deployed approximately 1/2 inch on the inboard side. Crew believes this to be cause of vibration experienced. There were no Thrust Reverser or any other abnormal indications with the instruments or annunciators. Again; it should be noted the Thrust Reversers were deferred and placed on the MEL the previous night. This was the first flight after a maintenance event.

Data retrieved from NASA's ASRS site 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.