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A B737-700 on climb at FL200 diverted due to #1 engine 'B' loop fault light illumination with #1 engine 'a' loop previously deferred.
| Attributes | |
| ACN | 494878 |
| Time | |
| Date | 200012 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 20000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute airway : j146.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer pilot : instrument pilot : multi engine pilot : commercial |
| Experience | flight time last 90 days : 180 flight time total : 14000 flight time type : 720 |
| ASRS Report | 494878 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : #1 engine fault warning other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : diverted to another airport |
| Consequence | other |
| Factors | |
| Maintenance | performance deficiency : inspection performance deficiency : fault isolation performance deficiency : repair performance deficiency : testing |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
During preflight checks, engine #1 'a' fire loop would not test. Same deferred by maintenance. As aircraft climbed through FL200 on departure from ZZZ, detector 'fault' light illuminated. Fire test indicated engine #1 'B' fire loop inoperative. QRH consulted. QRH recommends 'consideration should be given to landing as soon as practicable.' contacted dispatch, maintenance control, and operations manager. Consensus was that a return to ZZZ was appropriate. Flight returned to ZZZ and overweight landing made (144100 pounds). Callback conversation with reporter revealed the following information: the reporter said the diversion was required due to the 'a' loop being previously deferred. The reporter stated it was suspected a loop malfunction but did not receive any information from maintenance on the actual fix.
Original NASA ASRS Text
Title: A B737-700 ON CLB AT FL200 DIVERTED DUE TO #1 ENG 'B' LOOP FAULT LIGHT ILLUMINATION WITH #1 ENG 'A' LOOP PREVIOUSLY DEFERRED.
Narrative: DURING PREFLT CHKS, ENG #1 'A' FIRE LOOP WOULD NOT TEST. SAME DEFERRED BY MAINT. AS ACFT CLBED THROUGH FL200 ON DEP FROM ZZZ, DETECTOR 'FAULT' LIGHT ILLUMINATED. FIRE TEST INDICATED ENG #1 'B' FIRE LOOP INOP. QRH CONSULTED. QRH RECOMMENDS 'CONSIDERATION SHOULD BE GIVEN TO LNDG AS SOON AS PRACTICABLE.' CONTACTED DISPATCH, MAINT CTL, AND OPS MGR. CONSENSUS WAS THAT A RETURN TO ZZZ WAS APPROPRIATE. FLT RETURNED TO ZZZ AND OVERWT LNDG MADE (144100 LBS). CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID THE DIVERSION WAS REQUIRED DUE TO THE 'A' LOOP BEING PREVIOUSLY DEFERRED. THE RPTR STATED IT WAS SUSPECTED A LOOP MALFUNCTION BUT DID NOT RECEIVE ANY INFO FROM MAINT ON THE ACTUAL FIX.
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.