B757-200 altitude deviation altitude overshot in descent procedure.

Attributes
ACN	354380
Time
Date	199611
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ric
State Reference	VA
Altitude	msl bound lower : 14000 msl bound upper : 15000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	artcc : zdc
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 19000 flight time type : 1800
ASRS Report	354380
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : crossing restriction not met altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : returned to intended course or assigned course none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

Cleared to 15000 ft 25 DME south of ott. On autoplt, given descent to 15000 ft close to 25 DME fix. Autoplt, descending at 6000 FPM plus went into capture mode at 17000 ft and did not respond. Went straight through 15000 ft. I disconnected autoplt and took over. Bottom of descent was 14000 ft and I immediately climbed back to 15000 ft. Radar controller never said anything.

Original NASA ASRS Text

Title: B757-200 ALTDEV ALT OVERSHOT IN DSCNT PROC.

Narrative: CLRED TO 15000 FT 25 DME S OF OTT. ON AUTOPLT, GIVEN DSCNT TO 15000 FT CLOSE TO 25 DME FIX. AUTOPLT, DSNDING AT 6000 FPM PLUS WENT INTO CAPTURE MODE AT 17000 FT AND DID NOT RESPOND. WENT STRAIGHT THROUGH 15000 FT. I DISCONNECTED AUTOPLT AND TOOK OVER. BOTTOM OF DSCNT WAS 14000 FT AND I IMMEDIATELY CLBED BACK TO 15000 FT. RADAR CTLR NEVER SAID ANYTHING.

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.