An md-80 on normal landing the ground spoilers deployed then immediately retracted and disarmed autobraking. Autospoilers deployed manually ok. Cause unknown.

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Attributes
ACN	523845
Time
Date	200109
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Controlling Facilities	tracon : c90.tracon
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Navigation In Use	other
Flight Phase	landing : roll
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	523845
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : spoiler handle retract other flight crewa other flight crewb other other : 3
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Autospoilers failed to remain deployed on landing. They initially came back on touchdown and immediately retracted. Landing was normal to slightly firm but in no way unstuck and bounced. Airspeed, pitch and rate of descent were all normal. Autobrakes immediately disarmed on spoiler retraction. Ground spoilers stayed deployed when extended manually. Callback conversation with reporter revealed the following information: the reporter stated the landing was normal and the ground spoilers deployed and then immediately retracted and the autobrakes immediately disarmed on spoiler retraction. The reporter said maintenance checked the system finding no fault. The reporter stated he believes the problem is related to the landing gear position and the center of gravity. The reporter said in a smooth landing the main landing gear strut on initial touchdown raises slightly effectively putting the airplane in flight momentarily thus causing the retraction of the ground spoilers.

Original NASA ASRS Text

Title: AN MD-80 ON NORMAL LNDG THE GND SPOILERS DEPLOYED THEN IMMEDIATELY RETRACTED AND DISARMED AUTOBRAKING. AUTOSPOILERS DEPLOYED MANUALLY OK. CAUSE UNKNOWN.

Narrative: AUTOSPOILERS FAILED TO REMAIN DEPLOYED ON LNDG. THEY INITIALLY CAME BACK ON TOUCHDOWN AND IMMEDIATELY RETRACTED. LNDG WAS NORMAL TO SLIGHTLY FIRM BUT IN NO WAY UNSTUCK AND BOUNCED. AIRSPEED, PITCH AND RATE OF DSCNT WERE ALL NORMAL. AUTOBRAKES IMMEDIATELY DISARMED ON SPOILER RETRACTION. GND SPOILERS STAYED DEPLOYED WHEN EXTENDED MANUALLY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE LNDG WAS NORMAL AND THE GND SPOILERS DEPLOYED AND THEN IMMEDIATELY RETRACTED AND THE AUTOBRAKES IMMEDIATELY DISARMED ON SPOILER RETRACTION. THE RPTR SAID MAINT CHECKED THE SYS FINDING NO FAULT. THE RPTR STATED HE BELIEVES THE PROB IS RELATED TO THE LNDG GEAR POSITION AND THE CENTER OF GRAVITY. THE RPTR SAID IN A SMOOTH LNDG THE MAIN LNDG GEAR STRUT ON INITIAL TOUCHDOWN RAISES SLIGHTLY EFFECTIVELY PUTTING THE AIRPLANE IN FLT MOMENTARILY THUS CAUSING THE RETRACTION OF THE GND SPOILERS.

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.