Upon commencing descent the number 2 throttle would not respond to pilot inputs. The crew advised AT...

Attributes
ACN	1270762
Time
Date	201506
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	HS 125 Series
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Engine Control
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 50 Flight Crew Total 2100 Flight Crew Type 550
Person 2
Function	Captain Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 70 Flight Crew Total 10000 Flight Crew Type 3500
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

First officer and captain were flying 2 passengers to airport ZZZ. As we were approaching the ZZZ we were asked by ATC to begin a descent from flight level 390 to flight level 370. When the captain began to pull the throttles back to begin the descent; it became apparent that the throttle controlling the #2 engine was stuck in the open position and would not allow a reduction in power to that engine. The crew discussed the situation and decided to ask ATC for a lower altitude (in the lower 20;000 foot range) in case that engine had to be shut down and we needed to make a single engine approach. ATC granted our request and gave us vectors to a more direct approach to the airport. While in the descent; the throttle lever became active again and a normal approach and landing was made at ZZZ. During our descent we were asked several times by the ATC controllers if we had an emergency situation. Every time we answered that it was not an emergency and once the throttle became active again on the #2 engine; we relayed that information to ATC and repeated that we were not in an emergency situation and would need no assistance at the airport upon landing.evidently ATC took it upon themselves to activate an arff warning because fire and emergency equipment were at the ready when we landed at ZZZ. We discussed the situation with the person in charge of the fire department and filled out a report with him.

Original NASA ASRS Text

Title: Upon commencing descent the number 2 throttle would not respond to pilot inputs. The crew advised ATC of the situation and requested a lower altitude. However; during the descent; the throttle became responsive again and a normal approach and landing was accomplished.

Narrative: FO and Captain were flying 2 passengers to Airport ZZZ. As we were approaching the ZZZ we were asked by ATC to begin a descent from flight level 390 to flight level 370. When the Captain began to pull the throttles back to begin the descent; it became apparent that the throttle controlling the #2 engine was stuck in the open position and would not allow a reduction in power to that engine. The crew discussed the situation and decided to ask ATC for a lower altitude (in the lower 20;000 foot range) in case that engine had to be shut down and we needed to make a single engine approach. ATC granted our request and gave us vectors to a more direct approach to the airport. While in the descent; the throttle lever became active again and a normal approach and landing was made at ZZZ. During our descent we were asked several times by the ATC controllers if we had an emergency situation. Every time we answered that it was not an emergency and once the throttle became active again on the #2 engine; we relayed that information to ATC and repeated that we were not in an emergency situation and would need no assistance at the airport upon landing.Evidently ATC took it upon themselves to activate an ARFF warning because fire and emergency equipment were at the ready when we landed at ZZZ. We discussed the situation with the person in charge of the fire department and filled out a report with him.

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.