An small aircraft pilot, on final to tys, deviated from assigned altitude and airspeed.

Attributes
ACN	532426
Time
Date	200112
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : tys.airport
State Reference	TN
Altitude	msl single value : 2000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : tys.tracon tower : tys.tower
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Operating Under FAR Part	Part 91
Navigation In Use	ils localizer & glide slope : 5l
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 35 flight time total : 3150 flight time type : 75
ASRS Report	532426
Person 2
Affiliation	government : faa
Function	controller : approach
Events
Anomaly	altitude deviation : excursion from assigned altitude other anomaly
Independent Detector	other controllera
Resolutory Action	controller : issued alert flight crew : returned to assigned altitude other
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

ATC gave me vector to ILS localizer to runway 5R and instructed to maintain 2700 ft and 170 KTS. I allowed altitude to go to 2000 ft and speed to 120 KTS before I realized (with ATC alert). I immediately climbed back to 2700 ft and increased speed to 170 KTS. I was then turned over to knoxville tower to complete a successful normal ILS 5 left approach. Problem was, I used autoplt to descend to 2700 ft from 5000 ft and forgot to stop it at 2700 ft as instructed. I will fly manually in future, or if using autoplt, remember to stop descent at assigned altitude. Another contributing factor was inexperience doing ILS approachs in IMC with this aircraft. This was my first in this aircraft.

Original NASA ASRS Text

Title: AN SMA PLT, ON FINAL TO TYS, DEVIATED FROM ASSIGNED ALT AND AIRSPD.

Narrative: ATC GAVE ME VECTOR TO ILS LOC TO RWY 5R AND INSTRUCTED TO MAINTAIN 2700 FT AND 170 KTS. I ALLOWED ALT TO GO TO 2000 FT AND SPD TO 120 KTS BEFORE I REALIZED (WITH ATC ALERT). I IMMEDIATELY CLBED BACK TO 2700 FT AND INCREASED SPD TO 170 KTS. I WAS THEN TURNED OVER TO KNOXVILLE TWR TO COMPLETE A SUCCESSFUL NORMAL ILS 5 L APCH. PROB WAS, I USED AUTOPLT TO DSND TO 2700 FT FROM 5000 FT AND FORGOT TO STOP IT AT 2700 FT AS INSTRUCTED. I WILL FLY MANUALLY IN FUTURE, OR IF USING AUTOPLT, REMEMBER TO STOP DSCNT AT ASSIGNED ALT. ANOTHER CONTRIBUTING FACTOR WAS INEXPERIENCE DOING ILS APCHS IN IMC WITH THIS ACFT. THIS WAS MY FIRST IN THIS ACFT.

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.