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A B737-400 with a deferred inoperative APU fire detection is reported to have the master caution overheat detector annunciator and the master caution light inoperative.
| Attributes | |
| ACN | 455650 |
| Time | |
| Date | 199911 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other |
| Flight Phase | ground : parked ground : preflight |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : multi engine |
| Experience | flight time last 90 days : 210 flight time total : 8000 flight time type : 3000 |
| ASRS Report | 455650 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Air carrier flts #abc sjc pdx, #wxw wxy-pdx, and #XXX pdx-sjc, aircraft #xyz a B737-400. All the above 3 flts in aircraft xyz an incorrect MEL was entered in the maintenance log. The APU fire detection system was inoperative. But the engine overheat master caution on forward master caution display was also inhibited/inoperative. This should not have been the case with an inoperative APU fire warning system. Engine overheat lights on aircraft center console illuminated correctly but the master caution engine overheat light on forward panel did not illuminate. On flts #abc, #wxw, and #XXX we had no master caution engine overheat warning but engine overheat light on center console would illuminate but not give us a master caution warning. Again, this is not an associated system on the APU fire warning system. Incorrect maintenance write-up and inhibition of a required engine overheat warning system.
Original NASA ASRS Text
Title: A B737-400 WITH A DEFERRED INOP APU FIRE DETECTION IS RPTED TO HAVE THE MASTER CAUTION OVERHEAT DETECTOR ANNUNCIATOR AND THE MASTER CAUTION LIGHT INOP.
Narrative: ACR FLTS #ABC SJC PDX, #WXW WXY-PDX, AND #XXX PDX-SJC, ACFT #XYZ A B737-400. ALL THE ABOVE 3 FLTS IN ACFT XYZ AN INCORRECT MEL WAS ENTERED IN THE MAINT LOG. THE APU FIRE DETECTION SYS WAS INOP. BUT THE ENG OVERHEAT MASTER CAUTION ON FORWARD MASTER CAUTION DISPLAY WAS ALSO INHIBITED/INOP. THIS SHOULD NOT HAVE BEEN THE CASE WITH AN INOP APU FIRE WARNING SYS. ENG OVERHEAT LIGHTS ON ACFT CTR CONSOLE ILLUMINATED CORRECTLY BUT THE MASTER CAUTION ENG OVERHEAT LIGHT ON FORWARD PANEL DID NOT ILLUMINATE. ON FLTS #ABC, #WXW, AND #XXX WE HAD NO MASTER CAUTION ENG OVERHEAT WARNING BUT ENG OVERHEAT LIGHT ON CTR CONSOLE WOULD ILLUMINATE BUT NOT GIVE US A MASTER CAUTION WARNING. AGAIN, THIS IS NOT AN ASSOCIATED SYS ON THE APU FIRE WARNING SYS. INCORRECT MAINT WRITE-UP AND INHIBITION OF A REQUIRED ENG OVERHEAT WARNING SYS.
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.