Medium large transport on descent for landing has 'a' fire detection light activate on APU.

Attributes
ACN	245872
Time
Date	199307
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : den
State Reference	CO
Altitude	msl bound lower : 26000 msl bound upper : 26000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 5000
ASRS Report	245872
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Just prior to descent into den the APU fire detection loop 'a' light came on. A repeat item, APU was not running. Loop B system would not test properly. Followed QRH procedures. Landed in den without incident.

Original NASA ASRS Text

Title: MLG ON DSCNT FOR LNDG HAS 'A' FIRE DETECTION LIGHT ACTIVATE ON APU.

Narrative: JUST PRIOR TO DSCNT INTO DEN THE APU FIRE DETECTION LOOP 'A' LIGHT CAME ON. A REPEAT ITEM, APU WAS NOT RUNNING. LOOP B SYS WOULD NOT TEST PROPERLY. FOLLOWED QRH PROCS. LANDED IN DEN WITHOUT INCIDENT.

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.