B777 flight crew reports being dispatched with the right autothrottle inoperative. At FL330 and main...

Attributes
ACN	1274488
Time
Date	201506
Local Time Of Day	1201-1800
Place
Locale Reference	LECM.ARTCC
State Reference	FO
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B777-200
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Autothrottle/Speed Control
Person 1
Function	Pilot Flying
Person 2
Function	Pilot Not Flying
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Speed All Types

Narrative:

After level off and stable in cruise at FL330 and mach .83. (Right side auto throttle placarded inop; left side auto throttle working properly). Right throttle being operated manually and aligned with left throttle; which was engaged and properly maintaining assigned speed. During a busy time; several frequency changes and preparing for our oceanic clearance; aircraft speed reduced to an unacceptable level; operating throttle failed to advance at all and had to be manually overridden; which was done; airspeed returned to acceptable level shortly after correction was made. Flight continued without further problems; throttle were operated manually for the duration of flight.

Original NASA ASRS Text

Title: B777 Flight Crew reports being dispatched with the right autothrottle inoperative. At FL330 and maintaining Mach .83 the operating autothrottle fails to advance and the crew is alerted to a low speed condition by the EICAS. After recovery manual throttles are used for the remainder of the flight.

Narrative: After level off and stable in cruise at FL330 and Mach .83. (Right side auto throttle placarded inop; left side auto throttle working properly). Right throttle being operated manually and aligned with left throttle; which was engaged and properly maintaining assigned speed. During a busy time; several frequency changes and preparing for our oceanic clearance; aircraft speed reduced to an unacceptable level; operating throttle failed to advance at all and had to be manually overridden; which was done; airspeed returned to acceptable level shortly after correction was made. Flight continued without further problems; throttle were operated manually for the duration of flight.

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.

B777 flight crew reports being dispatched with the right autothrottle inoperative. At FL330 and maintaining mach .83 the operating autothrottle fails to advance and the crew is alerted to a low speed condition by the EICAS. After recovery manual throttles are used for the remainder of the flight.