Stabilizer out of trim light illuminated on B727 with autoplt in attitude hold coupled with a 1500 FPM descent. Recurrent problem that ground checks ok.

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Attributes
ACN	468692
Time
Date	200004
Day	Wed
Local Time Of Day	1801 To 2400
Place
State Reference	CT
Altitude	msl bound lower : 22500 msl bound upper : 23000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zbw.artcc
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : military pilot : commercial pilot : atp
Experience	flight time last 90 days : 75 flight time total : 14300 flight time type : 1312
ASRS Report	468692
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : atp pilot : commercial pilot : flight engineer
Experience	flight time last 90 days : 180 flight time total : 2800 flight time type : 450
ASRS Report	468693
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : stab. out of trim lght other flight crewa other flight crewb other other : 3
Resolutory Action	flight crew : regained aircraft control flight crew : returned to assigned altitude
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Cruising at FL230, I was looking at charts and adjusting my HSI when I noticed a stabilizer out of trim light for autoplt was on. Looked at altimeter and aircraft was descending at 1500 FPM with the autoplt in altitude hold. It had descended approximately 500 ft. Autoplt was disconnected and aircraft was out of trim nose down. Retrimmed and climbed back to FL230. Was out of FL230 less than 15 seconds. Upon arrival at bos, maintenance put autoplt on mco. The autoplt had a previous write-up describing exact same scenario. Maintenance corrective action was ground checked ok.

Original NASA ASRS Text

Title: STABILIZER OUT OF TRIM LIGHT ILLUMINATED ON B727 WITH AUTOPLT IN ATTITUDE HOLD COUPLED WITH A 1500 FPM DSCNT. RECURRENT PROB THAT GND CHKS OK.

Narrative: CRUISING AT FL230, I WAS LOOKING AT CHARTS AND ADJUSTING MY HSI WHEN I NOTICED A STABILIZER OUT OF TRIM LIGHT FOR AUTOPLT WAS ON. LOOKED AT ALTIMETER AND ACFT WAS DSNDING AT 1500 FPM WITH THE AUTOPLT IN ALT HOLD. IT HAD DSNDED APPROX 500 FT. AUTOPLT WAS DISCONNECTED AND ACFT WAS OUT OF TRIM NOSE DOWN. RETRIMMED AND CLBED BACK TO FL230. WAS OUT OF FL230 LESS THAN 15 SECONDS. UPON ARR AT BOS, MAINT PUT AUTOPLT ON MCO. THE AUTOPLT HAD A PREVIOUS WRITE-UP DESCRIBING EXACT SAME SCENARIO. MAINT CORRECTIVE ACTION WAS GND CHKED OK.

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.