A climbing B737-400 leaves its assigned altitude for a requested higher altitude prior to getting an actual clearance from ZSE, wa.

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Attributes
ACN	479140
Time
Date	200007
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zse.artcc
State Reference	WA
Altitude	msl bound lower : 29000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zse.artcc tower : dfw.tower
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : enroute altitude change
Route In Use	departure sid : ns enroute airway : ns.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : multi engine pilot : cfi pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 250 flight time total : 12600 flight time type : 5300
ASRS Report	479140
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp
Experience	flight time last 90 days : 250 flight time total : 15400 flight time type : 8000
ASRS Report	479166
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : company policies other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Environmental Factor Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During climb out of seattle, we were flight planned at FL290. We checked our FMC to see if we could climb to FL330 and it said we could. I requested it on 126.6 and we were cleared to FL330. During the climb, I asked center how the rides were at FL330 before I turned the seatbelt sign off and he said he had no complaints. Several mins later, center came back and said he remembered us asking about the rides at FL330, but not clearing us for it. Both of us then decided to fill this out even though we both remember being cleared to FL330. As I was talking to the passenger about our flight and turning the seatbelt sign off, center cleared us to FL330. I did not specifically hear center clear us since I was talking to the passenger, but the captain set FL330 in the MCP. Supplemental information from acn 479166: I questioned center if any follow-up ws required. He said no conflicts, so no follow-up required.

Original NASA ASRS Text

Title: A CLBING B737-400 LEAVES ITS ASSIGNED ALT FOR A REQUESTED HIGHER ALT PRIOR TO GETTING AN ACTUAL CLRNC FROM ZSE, WA.

Narrative: DURING CLBOUT OF SEATTLE, WE WERE FLT PLANNED AT FL290. WE CHKED OUR FMC TO SEE IF WE COULD CLB TO FL330 AND IT SAID WE COULD. I REQUESTED IT ON 126.6 AND WE WERE CLRED TO FL330. DURING THE CLB, I ASKED CTR HOW THE RIDES WERE AT FL330 BEFORE I TURNED THE SEATBELT SIGN OFF AND HE SAID HE HAD NO COMPLAINTS. SEVERAL MINS LATER, CTR CAME BACK AND SAID HE REMEMBERED US ASKING ABOUT THE RIDES AT FL330, BUT NOT CLRING US FOR IT. BOTH OF US THEN DECIDED TO FILL THIS OUT EVEN THOUGH WE BOTH REMEMBER BEING CLRED TO FL330. AS I WAS TALKING TO THE PAX ABOUT OUR FLT AND TURNING THE SEATBELT SIGN OFF, CTR CLRED US TO FL330. I DID NOT SPECIFICALLY HEAR CTR CLR US SINCE I WAS TALKING TO THE PAX, BUT THE CAPT SET FL330 IN THE MCP. SUPPLEMENTAL INFO FROM ACN 479166: I QUESTIONED CTR IF ANY FOLLOW-UP WS REQUIRED. HE SAID NO CONFLICTS, SO NO FOLLOW-UP REQUIRED.

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.