Altitude deviation on descent. Overshoot.

Attributes
ACN	306400
Time
Date	199505
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : clt
State Reference	NC
Altitude	msl bound lower : 11650 msl bound upper : 12000
Environment
Flight Conditions	Marginal
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zkc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute airway : zjx
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 180 flight time total : 6900 flight time type : 1800
ASRS Report	306400
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot 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:

On descent to 12000 ft MSL with autoplt on and 'VNAV' (FMS- descent path) engaged -- descent rate was increased by use of flight spoilers to make required crossing restr (12000 ft). When restr was captured, spoilers were retracted. Autoplt trim was extremely slow to provide nose-up trim. Altitude recaptured manually -- 350 ft maximum deviation. (11650 ft).

Original NASA ASRS Text

Title: ALTDEV ON DSCNT. OVERSHOOT.

Narrative: ON DSCNT TO 12000 FT MSL WITH AUTOPLT ON AND 'VNAV' (FMS- DSCNT PATH) ENGAGED -- DSCNT RATE WAS INCREASED BY USE OF FLT SPOILERS TO MAKE REQUIRED XING RESTR (12000 FT). WHEN RESTR WAS CAPTURED, SPOILERS WERE RETRACTED. AUTOPLT TRIM WAS EXTREMELY SLOW TO PROVIDE NOSE-UP TRIM. ALT RECAPTURED MANUALLY -- 350 FT MAX DEV. (11650 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.