Altitude deviation. Excursion from assigned when selecting heading select and inadvertently hitting the VNAV switch. Aircraft climbed 300 ft, flight crew saw it and returned to assigned.

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Attributes
ACN	339741
Time
Date	199606
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ama
State Reference	TX
Altitude	msl bound lower : 31000 msl bound upper : 31300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw
Operator	common carrier : air carrier
Make Model Name	L-1011 Tri-Star All Series
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 80 flight time total : 25000 flight time type : 80
ASRS Report	339741
Person 2
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : instrument pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 6000 flight time type : 1400
ASRS Report	339116
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

ATC gave us a 10 degree left turn, at the time we were using FMS (LNAV). The heading switch and the VNAV switch are next to each other. I must have hit the VNAV switch at the same time I pushed the heading switch. We noticed the altitude change as we were passing 31250 ft. The autoplt was kicked off and a recovery to 31000 ft was started. The maximum altitude we reached was 31300 ft.

Original NASA ASRS Text

Title: ALTDEV. EXCURSION FROM ASSIGNED WHEN SELECTING HDG SELECT AND INADVERTENTLY HITTING THE VNAV SWITCH. ACFT CLBED 300 FT, FLC SAW IT AND RETURNED TO ASSIGNED.

Narrative: ATC GAVE US A 10 DEG L TURN, AT THE TIME WE WERE USING FMS (LNAV). THE HDG SWITCH AND THE VNAV SWITCH ARE NEXT TO EACH OTHER. I MUST HAVE HIT THE VNAV SWITCH AT THE SAME TIME I PUSHED THE HDG SWITCH. WE NOTICED THE ALT CHANGE AS WE WERE PASSING 31250 FT. THE AUTOPLT WAS KICKED OFF AND A RECOVERY TO 31000 FT WAS STARTED. THE MAX ALT WE REACHED WAS 31300 FT.

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.