CL65 crew had access door come open in-flight.

Attributes
ACN	457555
Time
Date	199912
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lex.airport
State Reference	KY
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : lex.tower
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 200 flight time total : 2400 flight time type : 400
ASRS Report	457555
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 4000
ASRS Report	457725
Events
Anomaly	aircraft equipment problem : critical non adherence : company policies non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency flight crew : diverted to another airport flight crew : landed in emergency condition
Consequence	other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : scheduled maintenance performance deficiency : inspection performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Company Maintenance Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

Just after rotation, a fairly loud buzzing and high pitched whine were heard coming from the right side of the aircraft nose. No warnings or other cockpit indications occurred. After a short crew discussion it was decided safety dictated we return to the point of departure. We received ATC vectors for a visual approach. While turning from base to an approximately 20 mi final on indicated airspeed, warning flag was observed for approximately 1 second with a corresponding large fluctuation in airspeed. Airspeed then returned to normal. (The door is located in front of a pitot tube.) after an uneventful landing and taxi in, it was discovered an oxygen service door had opened up causing the noise. The door is hinged at the top and is spring-loaded to stay open when unlatched. After crew and mechanic inspection, the hinges and latches were operating properly. A 7 day service check had been performed the previous night and this was the first flight of the day. The mechanic and I were positive it was closed prior to taxi. Supplemental information from acn 457725: on takeoff, oxygen service door popped open. This caused very loud wind noises in cockpit and causes malfunctions in air data system because door 1) is in front of 1 pitot tube and angle of attack indicator. 2) door is not hinged into the slipstream so air forces it open. Door should be rotated 90 degrees and moved away from pitot tubes.

Original NASA ASRS Text

Title: CL65 CREW HAD ACCESS DOOR COME OPEN INFLT.

Narrative: JUST AFTER ROTATION, A FAIRLY LOUD BUZZING AND HIGH PITCHED WHINE WERE HEARD COMING FROM THE R SIDE OF THE ACFT NOSE. NO WARNINGS OR OTHER COCKPIT INDICATIONS OCCURRED. AFTER A SHORT CREW DISCUSSION IT WAS DECIDED SAFETY DICTATED WE RETURN TO THE POINT OF DEP. WE RECEIVED ATC VECTORS FOR A VISUAL APCH. WHILE TURNING FROM BASE TO AN APPROX 20 MI FINAL ON INDICATED AIRSPD, WARNING FLAG WAS OBSERVED FOR APPROX 1 SECOND WITH A CORRESPONDING LARGE FLUCTUATION IN AIRSPD. AIRSPD THEN RETURNED TO NORMAL. (THE DOOR IS LOCATED IN FRONT OF A PITOT TUBE.) AFTER AN UNEVENTFUL LNDG AND TAXI IN, IT WAS DISCOVERED AN OXYGEN SVC DOOR HAD OPENED UP CAUSING THE NOISE. THE DOOR IS HINGED AT THE TOP AND IS SPRING-LOADED TO STAY OPEN WHEN UNLATCHED. AFTER CREW AND MECH INSPECTION, THE HINGES AND LATCHES WERE OPERATING PROPERLY. A 7 DAY SVC CHK HAD BEEN PERFORMED THE PREVIOUS NIGHT AND THIS WAS THE FIRST FLT OF THE DAY. THE MECH AND I WERE POSITIVE IT WAS CLOSED PRIOR TO TAXI. SUPPLEMENTAL INFO FROM ACN 457725: ON TKOF, OXYGEN SVC DOOR POPPED OPEN. THIS CAUSED VERY LOUD WIND NOISES IN COCKPIT AND CAUSES MALFUNCTIONS IN AIR DATA SYS BECAUSE DOOR 1) IS IN FRONT OF 1 PITOT TUBE AND ANGLE OF ATTACK INDICATOR. 2) DOOR IS NOT HINGED INTO THE SLIPSTREAM SO AIR FORCES IT OPEN. DOOR SHOULD BE ROTATED 90 DEGS AND MOVED AWAY FROM PITOT TUBES.

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.