Air carrier medium large transport had broken spoiler return line causing trim difficulty at cruise. When unable to isolate flight crew decided to return land.

Home

Browse by month

Random

Latest

About

Contact

Attributes
ACN	109322
Time
Date	198904
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : vfb
State Reference	FL
Altitude	msl bound lower : 25000 msl bound upper : 25000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zma
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute airway : zma
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 6000
ASRS Report	109322
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During climb and level off at 25000' MSL we noted a slight rumbling sound and began having difficulty trimming the medium large transport in roll and yaw. We noted then that the right outboard spoiler was 'floating' up 10-15 degrees (20 degrees normal when selected in flight). The left outboard was also 'floating' very slightly. Isolating the controling hydraulic system was ineffective, so we returned to the originating airport, orl. Aircraft was fully ctlable in all configns of approach and landing, and no further difficulties encountered. Maintenance found a broken hydraulic return line which caused the #1 system spoiler problem.

Original NASA ASRS Text

Title: ACR MLG HAD BROKEN SPOILER RETURN LINE CAUSING TRIM DIFFICULTY AT CRUISE. WHEN UNABLE TO ISOLATE FLT CREW DECIDED TO RETURN LAND.

Narrative: DURING CLIMB AND LEVEL OFF AT 25000' MSL WE NOTED A SLIGHT RUMBLING SOUND AND BEGAN HAVING DIFFICULTY TRIMMING THE MLG IN ROLL AND YAW. WE NOTED THEN THAT THE RIGHT OUTBOARD SPOILER WAS 'FLOATING' UP 10-15 DEGS (20 DEGS NORMAL WHEN SELECTED IN FLT). THE LEFT OUTBOARD WAS ALSO 'FLOATING' VERY SLIGHTLY. ISOLATING THE CTLING HYD SYS WAS INEFFECTIVE, SO WE RETURNED TO THE ORIGINATING ARPT, ORL. ACFT WAS FULLY CTLABLE IN ALL CONFIGNS OF APCH AND LNDG, AND NO FURTHER DIFFICULTIES ENCOUNTERED. MAINT FOUND A BROKEN HYD RETURN LINE WHICH CAUSED THE #1 SYS SPOILER PROB.

Data retrieved from NASA's ASRS site as of August 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.