<< >> NASA ASRS Report 282656, September 1994

Flight crew of medium large transport used alternate means to lower the landing gear and flaps after the main hydraulic system malfunctioned.

Attributes
ACN	282656
Time
Date	199409
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mdt
State Reference	PA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mdt artcc : zau
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other landing other other
Route In Use	enroute airway : mdt
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	282656
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During descent, hydraulic system 1 low quantity message appeared on MFDU. System 1 hydraulic quantity was 30. Checklists performed according to operations manual. Gear and flaps were lowered by alternate means. Main gear doors retracted as advertised. Landing was uneventful. We taxied clear of runway with differential braking and shut down. Aircraft was towed to the gate by station personnel. No emergency was declared. Dispatch was notified prior to landing by mdt station. Holding was requested to allow time to accomplish checklists. Flight attendants were briefed on the situation prior to lowering gear and flaps. All passenger seemed ok during deplaning.

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Original NASA ASRS Text

Title: FLC OF MLG USED ALTERNATE MEANS TO LOWER THE LNDG GEAR AND FLAPS AFTER THE MAIN HYD SYS MALFUNCTIONED.

Narrative: DURING DSCNT, HYD SYS 1 LOW QUANTITY MESSAGE APPEARED ON MFDU. SYS 1 HYD QUANTITY WAS 30. CHKLISTS PERFORMED ACCORDING TO OPS MANUAL. GEAR AND FLAPS WERE LOWERED BY ALTERNATE MEANS. MAIN GEAR DOORS RETRACTED AS ADVERTISED. LNDG WAS UNEVENTFUL. WE TAXIED CLR OF RWY WITH DIFFERENTIAL BRAKING AND SHUT DOWN. ACFT WAS TOWED TO THE GATE BY STATION PERSONNEL. NO EMER WAS DECLARED. DISPATCH WAS NOTIFIED PRIOR TO LNDG BY MDT STATION. HOLDING WAS REQUESTED TO ALLOW TIME TO ACCOMPLISH CHKLISTS. FLT ATTENDANTS WERE BRIEFED ON THE SIT PRIOR TO LOWERING GEAR AND FLAPS. ALL PAX SEEMED OK DURING DEPLANING.

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.