Altitude deviation altitude overshot in climb. In-flight encounter with clear air turbulence.

Attributes
ACN	357980
Time
Date	199701
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ipl
State Reference	CA
Altitude	msl bound lower : 33000 msl bound upper : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
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 : 11000 flight time type : 1200
ASRS Report	357980
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 6500 flight time type : 2500
ASRS Report	357979
Events
Anomaly	altitude deviation : overshoot inflight encounter other non adherence : clearance non adherence : far other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Flight was operating from san-dtw. We were climbing to FL370. Encountered turbulence approximately FL340-FL345. ZLA asked if we were requesting FL330 or FL370. We asked about the rides and got clearance to FL370. We were handed off to another frequency. When level at FL370 and on the new frequency, the flight crew had thoughts about whether we were originally cleared to FL330 or FL370. ATC didn't make any comments. Possible readback/hearback situation. Supplemental information from acn 357979: approaching FL340, center asked us if we would like FL370. We said we would and continued our climb to FL370. We got the impression maybe we weren't cleared to FL370. We got a frequency change and were not able to pursue the issue.

Original NASA ASRS Text

Title: ALTDEV ALT OVERSHOT IN CLB. INFLT ENCOUNTER WITH CLR AIR TURB.

Narrative: FLT WAS OPERATING FROM SAN-DTW. WE WERE CLBING TO FL370. ENCOUNTERED TURB APPROX FL340-FL345. ZLA ASKED IF WE WERE REQUESTING FL330 OR FL370. WE ASKED ABOUT THE RIDES AND GOT CLRNC TO FL370. WE WERE HANDED OFF TO ANOTHER FREQ. WHEN LEVEL AT FL370 AND ON THE NEW FREQ, THE FLC HAD THOUGHTS ABOUT WHETHER WE WERE ORIGINALLY CLRED TO FL330 OR FL370. ATC DIDN'T MAKE ANY COMMENTS. POSSIBLE READBACK/HEARBACK SIT. SUPPLEMENTAL INFO FROM ACN 357979: APCHING FL340, CTR ASKED US IF WE WOULD LIKE FL370. WE SAID WE WOULD AND CONTINUED OUR CLB TO FL370. WE GOT THE IMPRESSION MAYBE WE WEREN'T CLRED TO FL370. WE GOT A FREQ CHANGE AND WERE NOT ABLE TO PURSUE THE ISSUE.

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.