Widebody transport flight crew has malfunctioning door warning activate. Emergency descent.

Attributes
ACN	154352
Time
Date	199008
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mxkf
State Reference	FO
Altitude	msl bound lower : 30000 msl bound upper : 30500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : mskf
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : commercial pilot : instrument
Experience	flight time last 90 days : 250 flight time total : 4400 flight time type : 750
ASRS Report	154352
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Emergency descent due to inadequate/malfunctioning door warning system. Previously written up and worked on by maintenance. False illumination of system caused emergency descent from 30000'. Crew realized in accordance with the procedures in aircraft flight manual and deviated from altitude assigned by ATC. HF comm was inadequate to obtain descent clearance and captain exercise emergency deviation authority.

Original NASA ASRS Text

Title: WDB FLT CREW HAS MALFUNCTIONING DOOR WARNING ACTIVATE. EMERGENCY DESCENT.

Narrative: EMER DSNT DUE TO INADEQUATE/MALFUNCTIONING DOOR WARNING SYS. PREVIOUSLY WRITTEN UP AND WORKED ON BY MAINT. FALSE ILLUMINATION OF SYS CAUSED EMER DSNT FROM 30000'. CREW REALIZED IN ACCORDANCE WITH THE PROCS IN ACFT FLT MANUAL AND DEVIATED FROM ALT ASSIGNED BY ATC. HF COMM WAS INADEQUATE TO OBTAIN DSNT CLRNC AND CAPT EXERCISE EMER DEV AUTHORITY.

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.