Aircraft equipment problem. Nose tire missing after landing. Flight crew noticed unusual thumping during taxi out, but it went away. Flight was uneventful with normal landing at destination. During taxi in, cessna pilot reported that their aircraft was missing a nosewheel.

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Attributes
ACN	330423
Time
Date	199603
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sna
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
ASRS Report	330423
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other other : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After a xbleed start of the left engine, we continued on taxiway M to runway 27L. I felt a rhythmic thumping that somewhat reminded me of a flat tire. The captain and I decided that it was not like any flat tire sound we had heard before. Anyway the sound went away in a few seconds. Throughout the turn onto and the takeoff roll from runway 27L I neither heard nor felt any other unusual sounds. The captain and I discussed a possible reason for this noise in-flight and decided it was just another one of those things. However, we would be aware of anything different at landing. There wasn't anything. Not until we were about to pull into the gate at sna and ground control said a cessna pilot was reporting we had only one nosewheel tire, did we have any indication anything at all had happened. I do not feel that we did anything wrong given what we knew, or didn't know at the time. The B757 is a very well built airplane and everything worked just fine with one nosewheel, just like it should have.

Original NASA ASRS Text

Title: ACFT EQUIP PROB. NOSE TIRE MISSING AFTER LNDG. FLC NOTICED UNUSUAL THUMPING DURING TAXI OUT, BUT IT WENT AWAY. FLT WAS UNEVENTFUL WITH NORMAL LNDG AT DEST. DURING TAXI IN, CESSNA PLT RPTED THAT THEIR ACFT WAS MISSING A NOSEWHEEL.

Narrative: AFTER A XBLEED START OF THE L ENG, WE CONTINUED ON TXWY M TO RWY 27L. I FELT A RHYTHMIC THUMPING THAT SOMEWHAT REMINDED ME OF A FLAT TIRE. THE CAPT AND I DECIDED THAT IT WAS NOT LIKE ANY FLAT TIRE SOUND WE HAD HEARD BEFORE. ANYWAY THE SOUND WENT AWAY IN A FEW SECONDS. THROUGHOUT THE TURN ONTO AND THE TKOF ROLL FROM RWY 27L I NEITHER HEARD NOR FELT ANY OTHER UNUSUAL SOUNDS. THE CAPT AND I DISCUSSED A POSSIBLE REASON FOR THIS NOISE INFLT AND DECIDED IT WAS JUST ANOTHER ONE OF THOSE THINGS. HOWEVER, WE WOULD BE AWARE OF ANYTHING DIFFERENT AT LNDG. THERE WASN'T ANYTHING. NOT UNTIL WE WERE ABOUT TO PULL INTO THE GATE AT SNA AND GND CTL SAID A CESSNA PLT WAS RPTING WE HAD ONLY ONE NOSEWHEEL TIRE, DID WE HAVE ANY INDICATION ANYTHING AT ALL HAD HAPPENED. I DO NOT FEEL THAT WE DID ANYTHING WRONG GIVEN WHAT WE KNEW, OR DIDN'T KNOW AT THE TIME. THE B757 IS A VERY WELL BUILT AIRPLANE AND EVERYTHING WORKED JUST FINE WITH ONE NOSEWHEEL, JUST LIKE IT SHOULD HAVE.

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.