F100 hydraulic loss due to leak in rudder power unit.

Attributes
ACN	479148
Time
Date	200007
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	intersection : ortro
State Reference	TX
Altitude	msl single value : 28000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : vacating altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
ASRS Report	479148
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 10500 flight time type : 2100
ASRS Report	479149
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : eicas other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On climb out, MFDU alert hydraulic system #2 low quantity. Reservoir had approximately 30% for system #2. We completed the procedure shutting off system #2 engine 1/2 pumps. We then took vectors direct dfw and declared an emergency. We got vectors direct runway 17C dfw. Approach and landing were uneventful except 7 units of left wing down trim was required. Callback conversation with reporter of acn 479149 revealed the following information: reporter said that on postflt inspection there appeared to be a leak in the area of the rudder power unit accounting for the loss of hydraulic fluid. With the fluid loss there is loss of one aileron but that should not have accounted for the amount of trim required. He suspects the failure of the rudder out of the faired position may have been the problem with trim.

Original NASA ASRS Text

Title: F100 HYD LOSS DUE TO LEAK IN RUDDER PWR UNIT.

Narrative: ON CLBOUT, MFDU ALERT HYD SYS #2 LOW QUANTITY. RESERVOIR HAD APPROX 30% FOR SYS #2. WE COMPLETED THE PROC SHUTTING OFF SYS #2 ENG 1/2 PUMPS. WE THEN TOOK VECTORS DIRECT DFW AND DECLARED AN EMER. WE GOT VECTORS DIRECT RWY 17C DFW. APCH AND LNDG WERE UNEVENTFUL EXCEPT 7 UNITS OF L WING DOWN TRIM WAS REQUIRED. CALLBACK CONVERSATION WITH RPTR OF ACN 479149 REVEALED THE FOLLOWING INFO: RPTR SAID THAT ON POSTFLT INSPECTION THERE APPEARED TO BE A LEAK IN THE AREA OF THE RUDDER PWR UNIT ACCOUNTING FOR THE LOSS OF HYD FLUID. WITH THE FLUID LOSS THERE IS LOSS OF ONE AILERON BUT THAT SHOULD NOT HAVE ACCOUNTED FOR THE AMOUNT OF TRIM REQUIRED. HE SUSPECTS THE FAILURE OF THE RUDDER OUT OF THE FAIRED POS MAY HAVE BEEN THE PROB WITH TRIM.

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.