Large transport return land ord because of noisy cockpit caused by improperly sealed cockpit window.

Attributes
ACN	164826
Time
Date	199012
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 5000 msl bound upper : 5700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : takeoff climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Experience	flight time last 90 days : 180 flight time total : 14000 flight time type : 9000
ASRS Report	164826
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 183 flight time total : 22300 flight time type : 4000
ASRS Report	165142
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Just after takeoff loud noise emanated from captain's sliding window. Wind noise became progressively louder as we climbed to assigned altitude of 5000' MSL. With the radio turned up to maximum vol, we could not clearly define radio calls. We thought we were cleared to climb to FL180 (after leveling off at 5000' MSL). We then heard controller saying turn to heading 180 degrees. We were at 5700' MSL and started back down to 5000' MSL. The controller then cleared us to 10000' MSL and we began to climb again. However, as we ascended the noise became even greater and no amount of effort to push the window handle further shut would reduce noise. At this time the captain made the decision to return to ord. Return and landing at ord was uneventful. Maintenance determined that the wrong size drain tube was installed next to sliding window and had become caught in the sliding window when maintenance had been performed on the captain's windshield wiper after the previous leg. Maintenance had closed the window, but the drain tube had broken the seal, causing excessive wind and pressurization noise.

Original NASA ASRS Text

Title: LGT RETURN LAND ORD BECAUSE OF NOISY COCKPIT CAUSED BY IMPROPERLY SEALED COCKPIT WINDOW.

Narrative: JUST AFTER TKOF LOUD NOISE EMANATED FROM CAPT'S SLIDING WINDOW. WIND NOISE BECAME PROGRESSIVELY LOUDER AS WE CLBED TO ASSIGNED ALT OF 5000' MSL. WITH THE RADIO TURNED UP TO MAX VOL, WE COULD NOT CLEARLY DEFINE RADIO CALLS. WE THOUGHT WE WERE CLRED TO CLB TO FL180 (AFTER LEVELING OFF AT 5000' MSL). WE THEN HEARD CTLR SAYING TURN TO HDG 180 DEGS. WE WERE AT 5700' MSL AND STARTED BACK DOWN TO 5000' MSL. THE CTLR THEN CLRED US TO 10000' MSL AND WE BEGAN TO CLB AGAIN. HOWEVER, AS WE ASCENDED THE NOISE BECAME EVEN GREATER AND NO AMOUNT OF EFFORT TO PUSH THE WINDOW HANDLE FURTHER SHUT WOULD REDUCE NOISE. AT THIS TIME THE CAPT MADE THE DECISION TO RETURN TO ORD. RETURN AND LNDG AT ORD WAS UNEVENTFUL. MAINT DETERMINED THAT THE WRONG SIZE DRAIN TUBE WAS INSTALLED NEXT TO SLIDING WINDOW AND HAD BECOME CAUGHT IN THE SLIDING WINDOW WHEN MAINT HAD BEEN PERFORMED ON THE CAPT'S WINDSHIELD WIPER AFTER THE PREVIOUS LEG. MAINT HAD CLOSED THE WINDOW, BUT THE DRAIN TUBE HAD BROKEN THE SEAL, CAUSING EXCESSIVE WIND AND PRESSURIZATION NOISE.

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.