APU fire warning after takeoff. Aircraft return land at departure airport.

Attributes
ACN	308733
Time
Date	199506
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : pit
State Reference	PA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ewr
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : takeoff landing other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 13000
ASRS Report	308733
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : declared emergency flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

At lift off from runway 28L (pit) APU fire warning occurred. Complied with emergency checklist, discharged fire bottle warning ceased. No emergency was declared since no warnings were present -- no reports of smoke/fire from tower. Returned to departure airport (pit) accomplished normal landing procedures except slightly over (less than 1000 pounds) maximum landing weight. Although no emergency was declared, pit crash fire rescue equipment was waiting for us after landing. I am submitting this report for possible use of NASA immunity in case FAA criticizes my decision to land overweight non-emergency.

Original NASA ASRS Text

Title: APU FIRE WARNING AFTER TKOF. ACFT RETURN LAND AT DEP ARPT.

Narrative: AT LIFT OFF FROM RWY 28L (PIT) APU FIRE WARNING OCCURRED. COMPLIED WITH EMER CHKLIST, DISCHARGED FIRE BOTTLE WARNING CEASED. NO EMER WAS DECLARED SINCE NO WARNINGS WERE PRESENT -- NO RPTS OF SMOKE/FIRE FROM TWR. RETURNED TO DEP ARPT (PIT) ACCOMPLISHED NORMAL LNDG PROCS EXCEPT SLIGHTLY OVER (LESS THAN 1000 LBS) MAX LNDG WT. ALTHOUGH NO EMER WAS DECLARED, PIT CFR WAS WAITING FOR US AFTER LNDG. I AM SUBMITTING THIS RPT FOR POSSIBLE USE OF NASA IMMUNITY IN CASE FAA CRITICIZES MY DECISION TO LAND OVERWT NON-EMER.

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.