An A300-600 on gear retraction a shudder was felt through the airframe and control yoke; followed by...

Attributes
ACN	644939
Time
Date	200501
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 800
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	A300
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	644939
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	644945
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : ecam warnings other flight crewa other flight crewb
Resolutory Action	controller : separated traffic flight crew : diverted to another airport flight crew : declared emergency
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On takeoff; gear retracted followed by shudder felt through aircraft frame and control yoke. Shortly followed by #1 yaw damper kicking off; causing involuntary rudder pedal movement. That was followed by #1 regulator failure and the #1 high pressure bleed failure. Copilot was flying aircraft at which time declared emergency and took over flying duties. Landed overweight on runway 31L. Rollout uneventful. Terminated emergency. Supplemental information from acn 644945: takeoff on runway 31L. No conflicting traffic to speak of. Just after gear retraction; I felt a shudder through the control yoke. Then a few seconds later; the #1 pressure regulator faulted and the #1 hp bleed faulted. At this time I leveled off at 2000 ft; still in VMC. The captain decided to declare an emergency with tower and we made a left downwind turn back to runway 31L. The captain took over the controls on midfield downwind and made the uneventful landing. We were at 313000 gross weight and the sink rate was 10 ft per min. Crash fire rescue equipment was called but was not needed. We terminated the emergency as we departed the runway. Callback conversation with reporter acn 644939 revealed the following information: the reporter stated the maintenance action taken and any parts that were replaced is unknown as maintenance has released no information. Callback conversation with reporter acn 644945 revealed the following information: the reporter stated the maintenance findings were unknown as maintenance has released no data on the fix.

Original NASA ASRS Text

Title: AN A300-600 ON GEAR RETRACTION A SHUDDER WAS FELT THROUGH THE AIRFRAME AND CTL YOKE; FOLLOWED BY YAW DAMPER DISCONNECTED WITH RUDDER PEDAL MOVEMENT. #1 PRESSURIZATION FAILED AND #1 HIGH PRESSURE BLEED FAILED. DECLARED EMER AND DIVERTED. CAUSE UNKNOWN.

Narrative: ON TKOF; GEAR RETRACTED FOLLOWED BY SHUDDER FELT THROUGH ACFT FRAME AND CTL YOKE. SHORTLY FOLLOWED BY #1 YAW DAMPER KICKING OFF; CAUSING INVOLUNTARY RUDDER PEDAL MOVEMENT. THAT WAS FOLLOWED BY #1 REGULATOR FAILURE AND THE #1 HIGH PRESSURE BLEED FAILURE. COPLT WAS FLYING ACFT AT WHICH TIME DECLARED EMER AND TOOK OVER FLYING DUTIES. LANDED OVERWT ON RWY 31L. ROLLOUT UNEVENTFUL. TERMINATED EMER. SUPPLEMENTAL INFO FROM ACN 644945: TKOF ON RWY 31L. NO CONFLICTING TFC TO SPEAK OF. JUST AFTER GEAR RETRACTION; I FELT A SHUDDER THROUGH THE CTL YOKE. THEN A FEW SECONDS LATER; THE #1 PRESSURE REGULATOR FAULTED AND THE #1 HP BLEED FAULTED. AT THIS TIME I LEVELED OFF AT 2000 FT; STILL IN VMC. THE CAPT DECIDED TO DECLARE AN EMER WITH TWR AND WE MADE A L DOWNWIND TURN BACK TO RWY 31L. THE CAPT TOOK OVER THE CTLS ON MIDFIELD DOWNWIND AND MADE THE UNEVENTFUL LNDG. WE WERE AT 313000 GROSS WT AND THE SINK RATE WAS 10 FT PER MIN. CFR WAS CALLED BUT WAS NOT NEEDED. WE TERMINATED THE EMER AS WE DEPARTED THE RWY. CALLBACK CONVERSATION WITH RPTR ACN 644939 REVEALED THE FOLLOWING INFO: THE RPTR STATED THE MAINT ACTION TAKEN AND ANY PARTS THAT WERE REPLACED IS UNKNOWN AS MAINT HAS RELEASED NO INFO. CALLBACK CONVERSATION WITH RPTR ACN 644945 REVEALED THE FOLLOWING INFO: THE RPTR STATED THE MAINT FINDINGS WERE UNKNOWN AS MAINT HAS RELEASED NO DATA ON THE FIX.

Data retrieved from NASA's ASRS site as of January 2009 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.

An A300-600 on gear retraction a shudder was felt through the airframe and control yoke; followed by yaw damper disconnected with rudder pedal movement. #1 pressurization failed and #1 high pressure bleed failed. Declared emergency and diverted. Cause unknown.