Saab-340B loses nosewheel assembly on landing.

Attributes
ACN	268573
Time
Date	199404
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : fyv
State Reference	AR
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	SF 340B
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : takeoff climbout : initial landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : cfi pilot : atp
Experience	flight time last 90 days : 400 flight time total : 12000 flight time type : 2000
ASRS Report	268573
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 225 flight time total : 5600 flight time type : 2500
ASRS Report	268338
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Aircraft departed dfw. Takeoff roll and rotation normal after positive rate, the captain called gear up. I (first officer) placed the handle in the up position at which time a 'pop' was heard. As all appeared normal, flight was continued. At destination fyv, land runway 16. Gear extension was normal, landing was normal as the nose wheel touched down, a vibration was noted. At taxi speed there was no vibration. Taxi to the gate was normal. Post flight discovered that the left nose tire of the SF340B was missing. It was found by fyv airport personnel about midfield. The wheel assembly was in fact, fully inflated, however, the hub assembly was worn with bits of metal broken out. The axle was still equipped with the lock nut and cotter pin. The wheel bearings appeared to have locked-up causing deterioration of the hub allowing it to slip over the lock nut. Supplemental information from acn 268338: 3 propeller blades had small places where the coating was chipped away and fiberglass exposed (possibly from bearings exiting aircraft).

Original NASA ASRS Text

Title: SAAB-340B LOSES NOSEWHEEL ASSEMBLY ON LNDG.

Narrative: ACFT DEPARTED DFW. TKOF ROLL AND ROTATION NORMAL AFTER POSITIVE RATE, THE CAPT CALLED GEAR UP. I (FO) PLACED THE HANDLE IN THE UP POS AT WHICH TIME A 'POP' WAS HEARD. AS ALL APPEARED NORMAL, FLT WAS CONTINUED. AT DEST FYV, LAND RWY 16. GEAR EXTENSION WAS NORMAL, LNDG WAS NORMAL AS THE NOSE WHEEL TOUCHED DOWN, A VIBRATION WAS NOTED. AT TAXI SPD THERE WAS NO VIBRATION. TAXI TO THE GATE WAS NORMAL. POST FLT DISCOVERED THAT THE L NOSE TIRE OF THE SF340B WAS MISSING. IT WAS FOUND BY FYV ARPT PERSONNEL ABOUT MIDFIELD. THE WHEEL ASSEMBLY WAS IN FACT, FULLY INFLATED, HOWEVER, THE HUB ASSEMBLY WAS WORN WITH BITS OF METAL BROKEN OUT. THE AXLE WAS STILL EQUIPPED WITH THE LOCK NUT AND COTTER PIN. THE WHEEL BEARINGS APPEARED TO HAVE LOCKED-UP CAUSING DETERIORATION OF THE HUB ALLOWING IT TO SLIP OVER THE LOCK NUT. SUPPLEMENTAL INFO FROM ACN 268338: 3 PROP BLADES HAD SMALL PLACES WHERE THE COATING WAS CHIPPED AWAY AND FIBERGLASS EXPOSED (POSSIBLY FROM BEARINGS EXITING ACFT).

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.