A jetstream 4100 on landing. Immediately after the nose gear touched down, aircraft jerked violently...

Attributes
ACN	494832
Time
Date	200012
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	Jetstream 41
Operating Under FAR Part	Part 121
Flight Phase	landing : roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : multi engine
Experience	flight time last 90 days : 250 flight time total : 3000 flight time type : 400
ASRS Report	494832
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other anomaly other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : anti- skid warning other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other other
Supplementary
Problem Areas	Flight Crew Human Performance Weather Aircraft
Primary Problem	Aircraft

Narrative:

We were on final approach to runway 33R at the airport. Profile was good. As we crossed the airport property fence, I called out approximately 3 KTS slow on final approach speed and slightly low on GS (1/2 DOT low). As the first officer flared, the main landing gear touched down smoothly. It was a very nice landing in fact. He slowly lowered the nose gear and as it neared ground contact, the aircraft jerked violently and started pulling left and right a small amount. I am not sure when the aircraft started jerking, but it was either a split second before or after the nose gear came in contact with the ground. We then got a yellow attention-getter with an antiskid caption. I then took control of the aircraft and it continued to jerk violently. No hard brake applications were applied and the engines were not in reverse. After the aircraft came to a stop, I immediately called for crash rescue. The rescue team advised me that the aircraft was ok except for the tires being blown. On postflt walkaround, I noticed that the left and right outboard tires were blown with a bald spot at the bottom of the tire where it was in contact with the runway. The left and right inboard tires were the exact opposite with numerous bald spots and over 1/2 the tire missing. I know I am not a mechanic, but I am sure the wheels seemed to lock up, pulling occasionally. Callback conversation with reporter revealed the following information: the reporter stated initially it was his guess the antiskid system failed but maintenance checked the system and found it operative. The reporter said the airplane was returned to service and no tire or antiskid reports were reported. The reporter stated the company had advised the pilots by memo that when requesting deicing make certain the people doing the deicing do not hose down the landing gear. The reporter said the reason for not deicing the landing gear was the pressurized fluid was entering the brake mounted wheel sensors and causing antiskid problems. The reporter stated the aircraft was deiced that morning but is not certain this caused the problem.

Original NASA ASRS Text

Title: A JETSTREAM 4100 ON LNDG. IMMEDIATELY AFTER THE NOSE GEAR TOUCHED DOWN, ACFT JERKED VIOLENTLY AND PULLED L AND R WITH ANTISKID WARNING. POSTFLT CHK REVEALED OUTBOARD TIRES BLOWN AND INBOARD TIRES FLAT SPOTTED.

Narrative: WE WERE ON FINAL APCH TO RWY 33R AT THE ARPT. PROFILE WAS GOOD. AS WE CROSSED THE ARPT PROPERTY FENCE, I CALLED OUT APPROX 3 KTS SLOW ON FINAL APCH SPD AND SLIGHTLY LOW ON GS (1/2 DOT LOW). AS THE FO FLARED, THE MAIN LNDG GEAR TOUCHED DOWN SMOOTHLY. IT WAS A VERY NICE LNDG IN FACT. HE SLOWLY LOWERED THE NOSE GEAR AND AS IT NEARED GND CONTACT, THE ACFT JERKED VIOLENTLY AND STARTED PULLING L AND R A SMALL AMOUNT. I AM NOT SURE WHEN THE ACFT STARTED JERKING, BUT IT WAS EITHER A SPLIT SECOND BEFORE OR AFTER THE NOSE GEAR CAME IN CONTACT WITH THE GND. WE THEN GOT A YELLOW ATTN-GETTER WITH AN ANTISKID CAPTION. I THEN TOOK CTL OF THE ACFT AND IT CONTINUED TO JERK VIOLENTLY. NO HARD BRAKE APPLICATIONS WERE APPLIED AND THE ENGS WERE NOT IN REVERSE. AFTER THE ACFT CAME TO A STOP, I IMMEDIATELY CALLED FOR CRASH RESCUE. THE RESCUE TEAM ADVISED ME THAT THE ACFT WAS OK EXCEPT FOR THE TIRES BEING BLOWN. ON POSTFLT WALKAROUND, I NOTICED THAT THE L AND R OUTBOARD TIRES WERE BLOWN WITH A BALD SPOT AT THE BOTTOM OF THE TIRE WHERE IT WAS IN CONTACT WITH THE RWY. THE L AND R INBOARD TIRES WERE THE EXACT OPPOSITE WITH NUMEROUS BALD SPOTS AND OVER 1/2 THE TIRE MISSING. I KNOW I AM NOT A MECH, BUT I AM SURE THE WHEELS SEEMED TO LOCK UP, PULLING OCCASIONALLY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED INITIALLY IT WAS HIS GUESS THE ANTISKID SYS FAILED BUT MAINT CHKED THE SYS AND FOUND IT OPERATIVE. THE RPTR SAID THE AIRPLANE WAS RETURNED TO SVC AND NO TIRE OR ANTISKID RPTS WERE RPTED. THE RPTR STATED THE COMPANY HAD ADVISED THE PLTS BY MEMO THAT WHEN REQUESTING DEICING MAKE CERTAIN THE PEOPLE DOING THE DEICING DO NOT HOSE DOWN THE LNDG GEAR. THE RPTR SAID THE REASON FOR NOT DEICING THE LNDG GEAR WAS THE PRESSURIZED FLUID WAS ENTERING THE BRAKE MOUNTED WHEEL SENSORS AND CAUSING ANTISKID PROBS. THE RPTR STATED THE ACFT WAS DEICED THAT MORNING BUT IS NOT CERTAIN THIS CAUSED THE PROB.

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.

A jetstream 4100 on landing. Immediately after the nose gear touched down, aircraft jerked violently and pulled left and right with antiskid warning. Postflt check revealed outboard tires blown and inboard tires flat spotted.