Flaw in equipment design contributes to altitude deviation.

Attributes
ACN	112562
Time
Date	198906
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : orl
State Reference	FL
Altitude	msl bound lower : 16000 msl bound upper : 16500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	general aviation : corporate
Make Model Name	Small Transport
Flight Phase	cruise other
Route In Use	enroute airway : zjx
Flight Plan	IFR
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 50 flight time total : 7200 flight time type : 600
ASRS Report	112562
Person 2
Affiliation	Other
Function	instruction : trainee
Qualification	pilot : private
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

While instructing private/military rated executive pilot, student inadvertently pressed go-around switch on power levers, aircraft pitched up 7-10, at an indicated airspeed of 160 KTS. Aircraft climbed rapidly from assigned altitude of 16,000', at which time we were already leveled at. I immediately disconnected the autoplt/flight director system, however, we had already busted our altitude by 500' by this time. I advised ATC of the nature of the altitude deviation. They never acknowledged the occurrence.

Original NASA ASRS Text

Title: FLAW IN EQUIPMENT DESIGN CONTRIBUTES TO ALT DEVIATION.

Narrative: WHILE INSTRUCTING PRIVATE/MIL RATED EXECUTIVE PLT, STUDENT INADVERTENTLY PRESSED GO-AROUND SWITCH ON POWER LEVERS, ACFT PITCHED UP 7-10, AT AN INDICATED AIRSPEED OF 160 KTS. ACFT CLIMBED RAPIDLY FROM ASSIGNED ALT OF 16,000', AT WHICH TIME WE WERE ALREADY LEVELED AT. I IMMEDIATELY DISCONNECTED THE AUTOPLT/FLT DIRECTOR SYSTEM, HOWEVER, WE HAD ALREADY BUSTED OUR ALT BY 500' BY THIS TIME. I ADVISED ATC OF THE NATURE OF THE ALT DEVIATION. THEY NEVER ACKNOWLEDGED THE OCCURRENCE.

Data retrieved from NASA's ASRS site as of August 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.