<< >> NASA ASRS Report 660110, May 2005

B737-700 captain reports finding both nose tires flat and questions why didn't technicians notice tires and why did both tires go flat?

Attributes
ACN	660110
Time
Date	200505
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : oak.airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ind.tower
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	660110
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : company policies non adherence : far
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	performance deficiency : non compliance with legal requirements performance deficiency : inspection
Supplementary
Problem Areas	Aircraft Chart Or Publication Maintenance Human Performance Flight Crew Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

During the preflight; the first officer reported that both nose tires were flat. Maintenance was requested and replaced both tires promptly. No delay was encountered. The mechanics reported that both tires were fine 45 mins prior when they towed the aircraft to the gate. 2 things struck us (first officer and myself) as odd: 1) why didn't the mechanics notice the flat tires when they walked out the plane to discuss the status of the plane when we arrived to preflight? 2) why would both tires go flat at the same time?

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Original NASA ASRS Text

Title: B737-700 CAPT RPTS FINDING BOTH NOSE TIRES FLAT AND QUESTIONS WHY DIDN'T TECHNICIANS NOTICE TIRES AND WHY DID BOTH TIRES GO FLAT?

Narrative: DURING THE PREFLT; THE FO RPTED THAT BOTH NOSE TIRES WERE FLAT. MAINT WAS REQUESTED AND REPLACED BOTH TIRES PROMPTLY. NO DELAY WAS ENCOUNTERED. THE MECHS RPTED THAT BOTH TIRES WERE FINE 45 MINS PRIOR WHEN THEY TOWED THE ACFT TO THE GATE. 2 THINGS STRUCK US (FO AND MYSELF) AS ODD: 1) WHY DIDN'T THE MECHS NOTICE THE FLAT TIRES WHEN THEY WALKED OUT THE PLANE TO DISCUSS THE STATUS OF THE PLANE WHEN WE ARRIVED TO PREFLT? 2) WHY WOULD BOTH TIRES GO FLAT AT THE SAME TIME?

Data retrieved from NASA's ASRS site as of January 2009 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.