<< >> NASA ASRS Report 531414, November 2001

A B737-700 was dispatched in non compliance with unmatched nose gear tire and wheel assemblies. One bias ply and other was a radial.

Attributes
ACN	531414
Time
Date	200111
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 23500 flight time type : 17550
ASRS Report	531414
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Experience	flight time last 90 days : 233 flight time total : 10285 flight time type : 5713
ASRS Report	531414
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : far non adherence : published procedure
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure contributing factor : work cards performance deficiency : inspection performance deficiency : installation
Supplementary
Problem Areas	Flight Crew Human Performance Maintenance Human Performance Chart Or Publication Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

On takeoff (first day for crew) from bhm to ZZZ, noticed a significant vibration that appeared to be coming from nose gear area. I called maintenance to inspect nose gear area. After nose gear area and tires were inspected, a decision was made to change the nose gear tires. We then flew ZZZ-oak-ZZZ2 where the aircraft terminated for the night. No further vibration was experienced on takeoff or landing. Late the next morning in my hotel room in ZZZ2 I received a call from the captain who originated the same aircraft in ZZZ2 to inform me that his first officer found one radial tire and one bias tire on that aircraft. After discussion with maintenance control ZZZ2, contract maintenance was called and radial nose tire was taken off and bias nose tire was put on so to have 2 bias nose gear tires. Flight departed about 18 mins late from ZZZ2. When I received this information I did remember reading a notice which was a copy of a maintenance notice concerning changing over to -700 radial nose gear tires.

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Original NASA ASRS Text

Title: A B737-700 WAS DISPATCHED IN NON COMPLIANCE WITH UNMATCHED NOSE GEAR TIRE AND WHEEL ASSEMBLIES. ONE BIAS PLY AND OTHER WAS A RADIAL.

Narrative: ON TKOF (FIRST DAY FOR CREW) FROM BHM TO ZZZ, NOTICED A SIGNIFICANT VIBRATION THAT APPEARED TO BE COMING FROM NOSE GEAR AREA. I CALLED MAINT TO INSPECT NOSE GEAR AREA. AFTER NOSE GEAR AREA AND TIRES WERE INSPECTED, A DECISION WAS MADE TO CHANGE THE NOSE GEAR TIRES. WE THEN FLEW ZZZ-OAK-ZZZ2 WHERE THE ACFT TERMINATED FOR THE NIGHT. NO FURTHER VIBRATION WAS EXPERIENCED ON TKOF OR LNDG. LATE THE NEXT MORNING IN MY HOTEL ROOM IN ZZZ2 I RECEIVED A CALL FROM THE CAPT WHO ORIGINATED THE SAME ACFT IN ZZZ2 TO INFORM ME THAT HIS FO FOUND ONE RADIAL TIRE AND ONE BIAS TIRE ON THAT ACFT. AFTER DISCUSSION WITH MAINT CTL ZZZ2, CONTRACT MAINT WAS CALLED AND RADIAL NOSE TIRE WAS TAKEN OFF AND BIAS NOSE TIRE WAS PUT ON SO TO HAVE 2 BIAS NOSE GEAR TIRES. FLT DEPARTED ABOUT 18 MINS LATE FROM ZZZ2. WHEN I RECEIVED THIS INFO I DID REMEMBER READING A NOTICE WHICH WAS A COPY OF A MAINT NOTICE CONCERNING CHANGING OVER TO -700 RADIAL NOSE GEAR TIRES.

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.