An medium large transport air carrier crew had a failure of the normal hydraulic stabilizer trim system. The backup electrical system got them on the ground with no further problems.

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Attributes
ACN	217476
Time
Date	199208
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : clt
State Reference	NC
Altitude	msl bound lower : 24000 msl bound upper : 24000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : clt
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 120 flight time total : 9200 flight time type : 420
ASRS Report	217476
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : overcame equipment problem flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

First officer was flying on autoplt when aircraft pitched up 2-300 ft. Both hydraulic stabilizer trim channels failed. Autoplt did not disconnect. I took over flying using electric back up trim and declared and emergency. Slow speed of electric trim made steady altitude control tricky. We ran the abnormal and normal checklists and a reduced flap landing was accomplished. During approach and descent we asked for and received block altitude assignments and tried to fly between them (11,000 and 12,000 -- we flew 11,500).

Original NASA ASRS Text

Title: AN MLG ACR CREW HAD A FAILURE OF THE NORMAL HYD STABILIZER TRIM SYS. THE BACKUP ELECTRICAL SYS GOT THEM ON THE GND WITH NO FURTHER PROBLEMS.

Narrative: FO WAS FLYING ON AUTOPLT WHEN ACFT PITCHED UP 2-300 FT. BOTH HYD STABILIZER TRIM CHANNELS FAILED. AUTOPLT DID NOT DISCONNECT. I TOOK OVER FLYING USING ELECTRIC BACK UP TRIM AND DECLARED AND EMER. SLOW SPD OF ELECTRIC TRIM MADE STEADY ALT CTL TRICKY. WE RAN THE ABNORMAL AND NORMAL CHKLISTS AND A REDUCED FLAP LNDG WAS ACCOMPLISHED. DURING APCH AND DSCNT WE ASKED FOR AND RECEIVED BLOCK ALT ASSIGNMENTS AND TRIED TO FLY BTWN THEM (11,000 AND 12,000 -- WE FLEW 11,500).

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.