Crj-200 has noise in nosewheel area from an undetermined source after takeoff. Maintenance determine...

Attributes
ACN	639021
Time
Date	200412
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mem.airport
State Reference	TN
Altitude	msl single value : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zme.artcc
Operator	common carrier : air carrier
Make Model Name	Regional Jet 200 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 240 flight time total : 6200 flight time type : 4600
ASRS Report	639021
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Climbing through 8000 ft, loud, rapid, clunking noise began from the nosewheel well area. I told the first officer, the PF, to disconnect the autoplt, slow the aircraft down and level off. We had no caution or warning messages and no indications of a problem. I pulled up and checked all EICAS pages with special attention to hydraulics, flight controls, and doors pages. Our flight attendant called asking if we knew of the noise and passenger concerns. I told him we were handling the problem and would get back to him as soon as we could. I found nothing abnormal with the aircraft, using all of the indications available. I feared we may have a nose gear door separating from the aircraft. I declared an emergency with mem and requested a return to mem. We ran through all normal checklists and notified the flight attendant and passenger of the situation and the return to mem. We landed with no problems. I advised the first officer to take it was easy on landing and easy on brakes using maximum reverse thrust and letting the aircraft roll to the end of the runway. We had no further incident so I canceled the emergency and taxied to the gate. Maintenance found a hydraulic valve for the nose landing gear doors at fault. Maintenance changed the valve. We ferried the aircraft home with no problems. Callback conversation with reporter revealed the following information: the reporter had experience a gear door separation in his background. The noise stopped after a time which led to the assumption that this could be the situation again.

Original NASA ASRS Text

Title: CRJ-200 HAS NOISE IN NOSEWHEEL AREA FROM AN UNDETERMINED SOURCE AFTER TKOF. MAINT DETERMINED THAT A VALVE FOR NOSE LNDG GEAR DOORS WAS AT FAULT.

Narrative: CLBING THROUGH 8000 FT, LOUD, RAPID, CLUNKING NOISE BEGAN FROM THE NOSEWHEEL WELL AREA. I TOLD THE FO, THE PF, TO DISCONNECT THE AUTOPLT, SLOW THE ACFT DOWN AND LEVEL OFF. WE HAD NO CAUTION OR WARNING MESSAGES AND NO INDICATIONS OF A PROB. I PULLED UP AND CHKED ALL EICAS PAGES WITH SPECIAL ATTN TO HYDS, FLT CTLS, AND DOORS PAGES. OUR FLT ATTENDANT CALLED ASKING IF WE KNEW OF THE NOISE AND PAX CONCERNS. I TOLD HIM WE WERE HANDLING THE PROB AND WOULD GET BACK TO HIM AS SOON AS WE COULD. I FOUND NOTHING ABNORMAL WITH THE ACFT, USING ALL OF THE INDICATIONS AVAILABLE. I FEARED WE MAY HAVE A NOSE GEAR DOOR SEPARATING FROM THE ACFT. I DECLARED AN EMER WITH MEM AND REQUESTED A RETURN TO MEM. WE RAN THROUGH ALL NORMAL CHKLISTS AND NOTIFIED THE FLT ATTENDANT AND PAX OF THE SIT AND THE RETURN TO MEM. WE LANDED WITH NO PROBS. I ADVISED THE FO TO TAKE IT WAS EASY ON LNDG AND EASY ON BRAKES USING MAX REVERSE THRUST AND LETTING THE ACFT ROLL TO THE END OF THE RWY. WE HAD NO FURTHER INCIDENT SO I CANCELED THE EMER AND TAXIED TO THE GATE. MAINT FOUND A HYD VALVE FOR THE NOSE LNDG GEAR DOORS AT FAULT. MAINT CHANGED THE VALVE. WE FERRIED THE ACFT HOME WITH NO PROBS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR HAD EXPERIENCE A GEAR DOOR SEPARATION IN HIS BACKGROUND. THE NOISE STOPPED AFTER A TIME WHICH LED TO THE ASSUMPTION THAT THIS COULD BE THE SIT AGAIN.

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.

Crj-200 has noise in nosewheel area from an undetermined source after takeoff. Maintenance determined that a valve for nose landing gear doors was at fault.