A B757-300 captain reported that the aircraft pitched up violently for unknown reasons after a smoot...

Narrative:

After [we had] a very smooth touch down as the weight settled on the wheels the aircraft violently pitched up. Wag about 5. I have been on the 756 for almost 20 years; and I have flown the -300 since it came on the property. The 200 has never done this. However this is the second time in about 6 months that I have had this happen on the -300. First time I wrote it up in the maintenance log; but maintenance found nothing wrong with the aircraft. Fortunately having seen it I knew what it was doing as it happened and was not as surprised as the first time. I am not the ace of the base; but I know when an airplane is doing something it shouldn't be doing. In both cases the first officer agreed that it was not a control input on my part. Discussing this with other pilots I have had some tell me they too had it happen and it scared the heck out of them. This airplane is doing something funny; and it needs to be looked in to. Feel free to call me to discuss particulars.

Original NASA ASRS Text

Title: A B757-300 Captain reported that the aircraft pitched up violently for unknown reasons after a smooth landing as the aircraft settle on the wheels. This was the reporter's second such event in six months.

Narrative: After [we had] a very smooth touch down as the weight settled on the wheels the aircraft violently pitched up. WAG about 5. I have been on the 756 for almost 20 years; and I have flown the -300 since it came on the property. The 200 has never done this. However this is the second time in about 6 months that I have had this happen on the -300. First time I wrote it up in the maintenance log; but Maintenance found nothing wrong with the aircraft. Fortunately having seen it I knew what it was doing as it happened and was not as surprised as the first time. I am not the ace of the base; but I know when an airplane is doing something it shouldn't be doing. In both cases the First Officer agreed that it was not a control input on my part. Discussing this with other pilots I have had some tell me they too had it happen and it scared the heck out of them. This airplane is doing something funny; and it needs to be looked in to. Feel free to call me to discuss particulars.

Data retrieved from NASA's ASRS site 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.

Attributes
ACN	1150967
Time
Date	201402
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B757-300
Operating Under FAR Part	Part 121
Flight Phase	Landing
Flight Plan	IFR
Person 1
Function	Pilot Flying Captain
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 24000 Flight Crew Type 10000
Events
Anomaly	Aircraft Equipment Problem Less Severe

A B757-300 captain reported that the aircraft pitched up violently for unknown reasons after a smooth landing as the aircraft settle on the wheels. This was the reporter's second such event in six months.