A B737-300 flight crew notes a yaw and reduced engine performance on #2 engine during climb out of d...

Attributes
ACN	511886
Time
Date	200105
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : den.airport
State Reference	CO
Altitude	msl bound lower : 24600 msl bound upper : 25000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv.artcc
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	511886
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	511890
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : ni-fuel flow other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency flight crew : landed in emergency condition none taken : detected after the fact other
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Climbing through FL246, captain (PF) felt the aircraft yaw and noticed the control yoke displace to the left. Autoplt was disconnected. Climb was stable at 300 KIAS in VNAV and LNAV. Engine instruments showed #1 N1 94.7% and #2 at 86.2% with a #1 fuel flow. 4700 pounds per hour and #2 2400 pounds per hour. Aircraft was leveled at FL250. Requested a precautionary return to den from ZDV. During return 5-6 inch throttle split was required to maintain matched N1's. Chidd notified and emergency was declared in case #2 engine would quit. Engine continued to run until shutdown on taxi in. Normal landing, rollout and taxi in were accomplished.

Original NASA ASRS Text

Title: A B737-300 FLC NOTES A YAW AND REDUCED ENG PERFORMANCE ON #2 ENG DURING CLBOUT OF DEN, CO.

Narrative: CLBING THROUGH FL246, CAPT (PF) FELT THE ACFT YAW AND NOTICED THE CTL YOKE DISPLACE TO THE L. AUTOPLT WAS DISCONNECTED. CLB WAS STABLE AT 300 KIAS IN VNAV AND LNAV. ENG INSTS SHOWED #1 N1 94.7% AND #2 AT 86.2% WITH A #1 FUEL FLOW. 4700 LBS PER HR AND #2 2400 LBS PER HR. ACFT WAS LEVELED AT FL250. REQUESTED A PRECAUTIONARY RETURN TO DEN FROM ZDV. DURING RETURN 5-6 INCH THROTTLE SPLIT WAS REQUIRED TO MAINTAIN MATCHED N1'S. CHIDD NOTIFIED AND EMER WAS DECLARED IN CASE #2 ENG WOULD QUIT. ENG CONTINUED TO RUN UNTIL SHUTDOWN ON TAXI IN. NORMAL LNDG, ROLLOUT AND TAXI IN WERE ACCOMPLISHED.

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.

A B737-300 flight crew notes a yaw and reduced engine performance on #2 engine during climb out of den, co.