MD80 crew had pitch down at stick shaker.

Attributes
ACN	446960
Time
Date	199908
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	intersection : beauty
State Reference	NY
Altitude	msl single value : 17000
Environment
Light	Night
Aircraft 1
Controlling Facilities	tracon : n90.tracon
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Flight Phase	descent : vacating altitude
Route In Use	arrival star : mip 5
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
ASRS Report	446960
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe non adherence : published procedure non adherence : company policies non adherence : far other anomaly
Independent Detector	other flight crewa other flight crewb
Resolutory Action	aircraft : equipment problem dissipated flight crew : overcame equipment problem flight crew : overrode automation flight crew : regained aircraft control
Supplementary
Problem Areas	Aircraft Company Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Mach overspd clacker triggered during descent on MIP5 arrival. Air carrier abc was asked to make best forward speed while on milton arrival to lga. As indicated, speed approached the limit needle in IAS mode -- IAS wheel was rolled to a slower speed and spoilers were deployed. The aircraft pitched nose down upon full deployment of spoilers and tripped the overspd warning. Autothrottles and autoplt were then disconnected to prevent further pitch down and speed increase. A slight increase from 1 G was felt during this event, which is the reason for this report. Method for a smooth recovery from this unusual circumstance is not taught in the time limited simulator sessions during training, which is now advised.

Original NASA ASRS Text

Title: MD80 CREW HAD PITCH DOWN AT STICK SHAKER.

Narrative: MACH OVERSPD CLACKER TRIGGERED DURING DSCNT ON MIP5 ARR. ACR ABC WAS ASKED TO MAKE BEST FORWARD SPD WHILE ON MILTON ARR TO LGA. AS INDICATED, SPD APCHED THE LIMIT NEEDLE IN IAS MODE -- IAS WHEEL WAS ROLLED TO A SLOWER SPD AND SPOILERS WERE DEPLOYED. THE ACFT PITCHED NOSE DOWN UPON FULL DEPLOYMENT OF SPOILERS AND TRIPPED THE OVERSPD WARNING. AUTOTHROTTLES AND AUTOPLT WERE THEN DISCONNECTED TO PREVENT FURTHER PITCH DOWN AND SPD INCREASE. A SLIGHT INCREASE FROM 1 G WAS FELT DURING THIS EVENT, WHICH IS THE REASON FOR THIS RPT. METHOD FOR A SMOOTH RECOVERY FROM THIS UNUSUAL CIRCUMSTANCE IS NOT TAUGHT IN THE TIME LIMITED SIMULATOR SESSIONS DURING TRAINING, WHICH IS NOW ADVISED.

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.