<< >> NASA ASRS Report 376306, August 1997

Bonanza 35 aircraft in cruise. Reporter pilot says that fatigue contributed to deviation from altitude which resulted in a near midair collision.

Attributes
ACN	376306
Time
Date	199708
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zla
State Reference	CA
Altitude	msl bound lower : 10500 msl bound upper : 10700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla
Operator	general aviation : personal
Make Model Name	Bonanza 35
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute airway : zla
Flight Plan	None
Aircraft 2
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 50 flight time total : 1300 flight time type : 30
ASRS Report	376306
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : nmac other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 100 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

I was cruising, and inadvertently climbed due to fatigue and turbulence. I had taken off from O5H at XX00 (ca time), and was flying over the desert in the later afternoon. I inadvertently climbed a couple hundred feet too high, not correcting for turbulence fast enough.

Related reports:

• Fractional aircraft first officer reported SOP deviations an...

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Original NASA ASRS Text

Title: BONANZA 35 ACFT IN CRUISE. RPTR PLT SAYS THAT FATIGUE CONTRIBUTED TO DEV FROM ALT WHICH RESULTED IN A NMAC.

Narrative: I WAS CRUISING, AND INADVERTENTLY CLBED DUE TO FATIGUE AND TURB. I HAD TAKEN OFF FROM O5H AT XX00 (CA TIME), AND WAS FLYING OVER THE DESERT IN THE LATER AFTERNOON. I INADVERTENTLY CLBED A COUPLE HUNDRED FEET TOO HIGH, NOT CORRECTING FOR TURB FAST ENOUGH.

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.