Altdevs occur as an air carrier flight crew deals with the loss of one of the left electrical bus.

Attributes
ACN	555513
Time
Date	200207
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bos.airport
State Reference	MA
Altitude	msl single value : 100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : a90.tracon tower : bos.tower
Operator	common carrier : air carrier
Make Model Name	MD-82
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 6000 flight time type : 700
ASRS Report	555513
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	altitude deviation : excursion from assigned altitude
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

After takeoff from bos, AC electrical power was lost on left bus. Ran checklists per procedure. Returned to bos landing visual on runway 4R. Loss of longitudinal trim was a result of electrical failure. There was also a loss of altitude alert, autoflt, flight director, autothrottle and left engine and system instruments. At times, there were deviations of about +/-200-250 ft from assigned altitude.

Original NASA ASRS Text

Title: ALTDEVS OCCUR AS AN ACR FLC DEALS WITH THE LOSS OF ONE OF THE L ELECTRICAL BUS.

Narrative: AFTER TKOF FROM BOS, AC ELECTRICAL PWR WAS LOST ON L BUS. RAN CHKLISTS PER PROC. RETURNED TO BOS LNDG VISUAL ON RWY 4R. LOSS OF LONGITUDINAL TRIM WAS A RESULT OF ELECTRICAL FAILURE. THERE WAS ALSO A LOSS OF ALT ALERT, AUTOFLT, FLT DIRECTOR, AUTOTHROTTLE AND L ENG AND SYS INSTS. AT TIMES, THERE WERE DEVS OF ABOUT +/-200-250 FT FROM ASSIGNED ALT.

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.