An A320 flight crew reports abnormal control response on takeoff out of cyvr.

Attributes
ACN	719604
Time
Date	200612
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cyvr.airport
State Reference	BC
Altitude	agl single value : 100
Environment
Flight Conditions	VMC
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 240 flight time total : 10000 flight time type : 5700
ASRS Report	719604
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	Aircraft
Primary Problem	Ambiguous

Narrative:

On initial rotation out of cyvr the aircraft made an uncommanded increase in pitch attitude of approximately 8-10 degrees. Aircraft responded normally after that to pilot input and pitch attitude was decreased to normal climb attitude. It is my opinion that when the aircraft 'blends' from ground mode to flight mode there was an uncommanded or unwanted abnormal increase in pitch attitude that I had not experienced on other aircraft. I have been flying the airbus for 8 yrs now and have never had an aircraft do that. The remainder of the flight was as normal with normal flight control responses both on and off the autoplt. Normal climb attitude once established is approximately 10 degrees nose up. The uncommanded excursion took us to approximately 15-18 degrees; but responded after that to normal control stick inputs. The captain (who is also very experienced on the airbus); and I discussed the event and decided it warranted a logbook write-up.

Original NASA ASRS Text

Title: AN A320 FLT CREW RPTS ABNORMAL CTL RESPONSE ON TKOF OUT OF CYVR.

Narrative: ON INITIAL ROTATION OUT OF CYVR THE ACFT MADE AN UNCOMMANDED INCREASE IN PITCH ATTITUDE OF APPROX 8-10 DEGS. ACFT RESPONDED NORMALLY AFTER THAT TO PLT INPUT AND PITCH ATTITUDE WAS DECREASED TO NORMAL CLB ATTITUDE. IT IS MY OPINION THAT WHEN THE ACFT 'BLENDS' FROM GND MODE TO FLT MODE THERE WAS AN UNCOMMANDED OR UNWANTED ABNORMAL INCREASE IN PITCH ATTITUDE THAT I HAD NOT EXPERIENCED ON OTHER ACFT. I HAVE BEEN FLYING THE AIRBUS FOR 8 YRS NOW AND HAVE NEVER HAD AN ACFT DO THAT. THE REMAINDER OF THE FLT WAS AS NORMAL WITH NORMAL FLT CTL RESPONSES BOTH ON AND OFF THE AUTOPLT. NORMAL CLB ATTITUDE ONCE ESTABLISHED IS APPROX 10 DEGS NOSE UP. THE UNCOMMANDED EXCURSION TOOK US TO APPROX 15-18 DEGS; BUT RESPONDED AFTER THAT TO NORMAL CTL STICK INPUTS. THE CAPT (WHO IS ALSO VERY EXPERIENCED ON THE AIRBUS); AND I DISCUSSED THE EVENT AND DECIDED IT WARRANTED A LOGBOOK WRITE-UP.

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.