B737 captain reported that after landing both engines were unresponsive to throttle input.

Attributes
ACN	1575306
Time
Date	201809
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B737 Next Generation Undifferentiated
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Component
Aircraft Component	Engine Control
Person 1
Function	Pilot Not Flying Captain Check Pilot
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Engineer Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 190 Flight Crew Total 20000 Flight Crew Type 15000
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

After landing and clearing [the] runway; we momentarily stopped awaiting ATC instructions for taxi to the gate. When ready to proceed; throttles were advanced but both engines were unresponsive. Both engines were stuck at 20.2% N1; idle. Throttles were moved several times both together and individually with no engine response. Both reverser and both engine control lights on the aft overhead engine panel were illuminated. Both eecs were manually selected to altn and when throttles were again moved; the engines responded. Total time from stopping the aircraft to regaining engine control was probably less than 60 seconds. The manual selection on altn and the regaining of throttle response may have been purely coincidental as it was discovered later by maintenance that that there were 6 thrust reverser 'stow' faults. It appears that the cause was a bad engine accessory unit (eau).

Original NASA ASRS Text

Title: B737 Captain reported that after landing both engines were unresponsive to throttle input.

Narrative: After landing and clearing [the] runway; we momentarily stopped awaiting ATC instructions for taxi to the gate. When ready to proceed; throttles were advanced but both engines were unresponsive. Both engines were stuck at 20.2% N1; idle. Throttles were moved several times both together and individually with no engine response. Both reverser and both engine control lights on the aft overhead engine panel were illuminated. Both EECS were manually selected to ALTN and when throttles were again moved; the engines responded. Total time from stopping the aircraft to regaining engine control was probably less than 60 seconds. The manual selection on ALTN and the regaining of throttle response may have been purely coincidental as it was discovered later by maintenance that that there were 6 thrust reverser 'stow' faults. It appears that the cause was a bad Engine Accessory Unit (EAU).

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.