<< >> NASA ASRS Report 396802, March 1998

An EMB120 was dispatched after maintenance with the nose landing gear doors locked in the open position.

Attributes
ACN	396802
Time
Date	199803
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 135
Navigation In Use	Other
Flight Phase	other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 270 flight time total : 11000 flight time type : 7000
ASRS Report	396802
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Accepted aircraft from previous crew with 2 maintenance write-ups - - green system hydraulic fluid indicator gauge slowly decreasing and service door light comes on in-flight. Aircraft was cleared of these 2 write-ups and properly signed off. Departed gate for destination. Within 3 mins of taxi out green hydraulic system fluid gauge was showing decreasing levels of fluid. Returned to gate. Maintenance again worked on problem replacing the gauge and rechking hydraulic fluid level. Departed again, this time on climb out we felt an unusual vibration. I knew what it was. Returned for landing and found nosewheel landing gear clam shell doors open. Maintenance resecured doors to internal bell cranks, inspected them, then we departed again for destination. I personally inspected all panels before we left the second time. I saw the nosewheel doors down but they were latched (door handles closed and locked). I had no reason to doubt they would not retract upon hydraulic system pressurization -- this is the norm.

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Original NASA ASRS Text

Title: AN EMB120 WAS DISPATCHED AFTER MAINT WITH THE NOSE LNDG GEAR DOORS LOCKED IN THE OPEN POS.

Narrative: ACCEPTED ACFT FROM PREVIOUS CREW WITH 2 MAINT WRITE-UPS - - GREEN SYS HYD FLUID INDICATOR GAUGE SLOWLY DECREASING AND SVC DOOR LIGHT COMES ON INFLT. ACFT WAS CLRED OF THESE 2 WRITE-UPS AND PROPERLY SIGNED OFF. DEPARTED GATE FOR DEST. WITHIN 3 MINS OF TAXI OUT GREEN HYD SYS FLUID GAUGE WAS SHOWING DECREASING LEVELS OF FLUID. RETURNED TO GATE. MAINT AGAIN WORKED ON PROB REPLACING THE GAUGE AND RECHKING HYD FLUID LEVEL. DEPARTED AGAIN, THIS TIME ON CLBOUT WE FELT AN UNUSUAL VIBRATION. I KNEW WHAT IT WAS. RETURNED FOR LNDG AND FOUND NOSEWHEEL LNDG GEAR CLAM SHELL DOORS OPEN. MAINT RESECURED DOORS TO INTERNAL BELL CRANKS, INSPECTED THEM, THEN WE DEPARTED AGAIN FOR DEST. I PERSONALLY INSPECTED ALL PANELS BEFORE WE LEFT THE SECOND TIME. I SAW THE NOSEWHEEL DOORS DOWN BUT THEY WERE LATCHED (DOOR HANDLES CLOSED AND LOCKED). I HAD NO REASON TO DOUBT THEY WOULD NOT RETRACT UPON HYD SYS PRESSURIZATION -- THIS IS THE NORM.

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.