A320 flight crew experiences abnormal aircraft maneuvers during ILS approach.

Attributes
ACN	565924
Time
Date	200211
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	intersection : nabbo
State Reference	MA
Altitude	msl single value : 3000
Environment
Light	Night
Aircraft 1
Controlling Facilities	tracon : a90.tracon
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 4r other
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	565924
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	565923
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : overcame equipment problem flight crew : overrode automation flight crew : executed missed approach
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Aircraft Environmental Factor Navigational Facility
Primary Problem	Aircraft

Narrative:

Level 3000 ft, localizer for the localizer, the GS still not broken from top. Cleared the approach, hit the approach button. The aircraft pitched up sharply and added power. Manually disconnected and flew to 3000 ft where I put the autoplt back on level 3000 ft on the localizer with the GS just about exactly right there at nabbo. Hit approach and the same happened as before. Tower called and we requested vectors to try again. Next time, did all the same things after talking about what happened and all went a-ok. Why did this happen?

Original NASA ASRS Text

Title: A320 FLC EXPERIENCES ABNORMAL ACFT MANEUVERS DURING ILS APCH.

Narrative: LEVEL 3000 FT, LOC FOR THE LOC, THE GS STILL NOT BROKEN FROM TOP. CLRED THE APCH, HIT THE APCH BUTTON. THE ACFT PITCHED UP SHARPLY AND ADDED PWR. MANUALLY DISCONNECTED AND FLEW TO 3000 FT WHERE I PUT THE AUTOPLT BACK ON LEVEL 3000 FT ON THE LOC WITH THE GS JUST ABOUT EXACTLY RIGHT THERE AT NABBO. HIT APCH AND THE SAME HAPPENED AS BEFORE. TWR CALLED AND WE REQUESTED VECTORS TO TRY AGAIN. NEXT TIME, DID ALL THE SAME THINGS AFTER TALKING ABOUT WHAT HAPPENED AND ALL WENT A-OK. WHY DID THIS HAPPEN?

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.