A B757-200 in initial climb at 2000 ft experienced a jolt followed by the autothrottle increasing engine to a high power setting. Cabin attendant and passenger report seeing a flash behind left engine.

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Attributes
ACN	599084
Time
Date	200311
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 2000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 17000 flight time type : 2000
ASRS Report	599084
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 30 flight time total : 4000 flight time type : 350
ASRS Report	598928
Events
Anomaly	aircraft equipment problem : critical other anomaly other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : airspeed indicator
Resolutory Action	none taken : detected after the fact
Consequence	other other
Supplementary
Problem Areas	Environmental Factor Flight Crew Human Performance Airport Aircraft
Primary Problem	Aircraft

Narrative:

While engine power was reducing from maximum takeoff thrust to climb 2, there was a jolt similar to a food cart hitting a bulkhead. The autothrottle then increased engine power back to a high power setting. The first officer pulled the throttle back to the reduced setting, but it then went back to a high climb power setting. Then first officer therefore disconnected the autothrottle (airspeed was building). During the distraction, airspeed increased above 250 KTS. Speed was then returned back to 250 KTS. The engine parameters appeared normal, and pressurization appeared normal. The flight attendants reported hearing and feeling the jolt. 1 flight attendant reported seeing a flash behind the left wing. 3 passenger also reported seeing a flash behind the left engine.

Original NASA ASRS Text

Title: A B757-200 IN INITIAL CLB AT 2000 FT EXPERIENCED A JOLT FOLLOWED BY THE AUTOTHROTTLE INCREASING ENG TO A HIGH PWR SETTING. CABIN ATTENDANT AND PAX RPT SEEING A FLASH BEHIND L ENG.

Narrative: WHILE ENG PWR WAS REDUCING FROM MAX TKOF THRUST TO CLB 2, THERE WAS A JOLT SIMILAR TO A FOOD CART HITTING A BULKHEAD. THE AUTOTHROTTLE THEN INCREASED ENG PWR BACK TO A HIGH PWR SETTING. THE FO PULLED THE THROTTLE BACK TO THE REDUCED SETTING, BUT IT THEN WENT BACK TO A HIGH CLB PWR SETTING. THEN FO THEREFORE DISCONNECTED THE AUTOTHROTTLE (AIRSPD WAS BUILDING). DURING THE DISTR, AIRSPD INCREASED ABOVE 250 KTS. SPD WAS THEN RETURNED BACK TO 250 KTS. THE ENG PARAMETERS APPEARED NORMAL, AND PRESSURIZATION APPEARED NORMAL. THE FLT ATTENDANTS RPTED HEARING AND FEELING THE JOLT. 1 FLT ATTENDANT RPTED SEEING A FLASH BEHIND THE L WING. 3 PAX ALSO RPTED SEEING A FLASH BEHIND THE L ENG.

Data retrieved from NASA's ASRS site as of July 2007 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.