B767-300 captain reported anomalies on right engine indications during descent.

Attributes
ACN	1580065
Time
Date	201809
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Turbine Engine
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

After descending from FL410 to FL310; the right engine remained at 54.6% N1 while the left engine operated normally. Despite the thrust lever being advanced; N1 did not increase even though the trend vector was advancing to what should have been normal thrust. At this time there were no other EICAS or abnormal indications of any sort. After descending from FL310 to FL270; the thrust levers advanced and normal power was produced by both engines. The right engine continued to operate normally for the remainder of the flight. While we did request and receive priority handling; no emergency was declared and we landed with no further incident.

Original NASA ASRS Text

Title: B767-300 Captain reported anomalies on right engine indications during descent.

Narrative: After descending from FL410 to FL310; the right engine remained at 54.6% N1 while the left engine operated normally. Despite the thrust lever being advanced; N1 did not increase even though the trend vector was advancing to what should have been normal thrust. At this time there were no other EICAS or abnormal indications of any sort. After descending from FL310 to FL270; the thrust levers advanced and normal power was produced by both engines. The right engine continued to operate normally for the remainder of the flight. While we did request and receive priority handling; no emergency was declared and we landed with no further incident.

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.