Air carrier medium large transport altitude deviation overshot during descent using autoplt with autothrottles. Stall warning activated entering holding pattern.

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Attributes
ACN	92419
Time
Date	198808
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ihd
State Reference	PA
Altitude	msl bound lower : 8000 msl bound upper : 9000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pit
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	other
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 : 10000
ASRS Report	92419
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 10000 flight time type : 6500
ASRS Report	92617
Events
Anomaly	altitude deviation : overshoot altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : regained aircraft control
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While in initial turn entering hold (right turn) and speed set on autoplt mode control panel at 210 KTS (minimum maneuver speed 205 KTS), experienced stick shake moments later in 20-25 degree bank. Applied power (throttles were closed due to level change, descent to 9000'. Lag time produced increased shake. Lowered nose and altitude loss occurred approximately 400-500'. Notified ATC of descent and continued to 8000' for full recovery. Climbed back to 9000' per ATC request. No further actions required. No conflict. Autothrottle response was contributing factor.

Original NASA ASRS Text

Title: ACR MLG ALT DEVIATION OVERSHOT DURING DESCENT USING AUTOPLT WITH AUTOTHROTTLES. STALL WARNING ACTIVATED ENTERING HOLDING PATTERN.

Narrative: WHILE IN INITIAL TURN ENTERING HOLD (RIGHT TURN) AND SPEED SET ON AUTOPLT MODE CTL PANEL AT 210 KTS (MINIMUM MANEUVER SPD 205 KTS), EXPERIENCED STICK SHAKE MOMENTS LATER IN 20-25 DEG BANK. APPLIED PWR (THROTTLES WERE CLOSED DUE TO LEVEL CHANGE, DSCNT TO 9000'. LAG TIME PRODUCED INCREASED SHAKE. LOWERED NOSE AND ALT LOSS OCCURRED APPROX 400-500'. NOTIFIED ATC OF DSCNT AND CONTINUED TO 8000' FOR FULL RECOVERY. CLBED BACK TO 9000' PER ATC REQUEST. NO FURTHER ACTIONS REQUIRED. NO CONFLICT. AUTOTHROTTLE RESPONSE WAS CONTRIBUTING FACTOR.

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.