FLC OF AN MLG ACR ACFT HAD ALL 4 MAIN LNDG GEAR TIRES FLAT AFTER LNDG ROLL ON A SNOW COVERED RWY.

Narrative

ON NORMAL LNDG BRAKES WERE APPARENTLY ON WITHOUT PLT INPUT AND ACFT CAME TO A STOP ON A SNOW COVERED RWY WITH ALL 4 MAIN TIRES FLAT. NOT SURE WHAT HAPPENED. POSSIBLE ANTI-SKID OR PARKING BRAKE MALFUNCTION DUE TO COLD WX/DE- ICING. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: RPTR STATED THAT THE ACFT WAS A DC9-30 TYPE ACFT AND SUBSEQUENT INVESTIGATION BY THE FAA AND THE ACFT MANUFACTURER DID NOT REVEAL ANY ABNORMALITY OF THE BRAKING SYS; INCLUDING THE ANTI-SKID SYS; EXCEPT FOR A LOOSE WIRE ON ONE SIDE. THE ACFT MANUFACTURING REPRESENTATIVE COULD NOT GIVE ANY REASON FOR THE PROB. THE RPTR FURTHER STATED THAT THE ACFT HAD A PROB DURING THE TKOF PRIOR TO THIS LNDG. IT SEEMS THAT THE FO HAD TROUBLE DURING THE TKOF WHEREIN DIRECTIONAL CTL WAS LOST DURING THE TKOF ROLL AND THE RPTING CAPT HAD TAKEN OVER AND LIFTED THE ACFT INTO THE AIR TO PREVENT GOING OFF THE SIDE OF THE RWY. HE THOUGHT IT MAY HAVE BEEN CAUSED BY THE PARKING BRAKE INADVERTENTLY LEFT ON DURING TKOF. HOWEVER; IN OUR DISCUSSION THIS WAS RULED OUT SINCE THE CAPT REMEMBERS THE ACFT ROLLING AFTER BRAKE RELEASE. HE NOW BELIEVES THAT THE FO COULD HAVE 'RIDDEN' THE BRAKES BOTH ON TKOF AND LNDG CAUSING THE ANTI-SKID SYS TO NOT BE USEFUL ON LNDG SINCE THE WHEELS WERE NOT ABLE TO SPIN UP TO THE MINIMUM OF 40 KTS TO REACT. THEREFORE; THE BRAKES COULD HAVE BEEN ALL LOCKED DURING TOUCHDOWN. HE THANKED ME FOR THE CALL AND OBSERVATIONS SUGGESTIONS.