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A B737-200 was released for service with the #1 engine overheat warning system deferred but the loop selector switch was positioned improperly in conflict with the MEL.
| Attributes | |
| ACN | 421056 |
| Time | |
| Date | 199811 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zzz airport : zzz |
| State Reference | US |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-200 |
| Flight Phase | other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | other other : other |
| ASRS Report | 421056 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | other personnel other oversight : supervisor |
| Qualification | other other : other |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
In-flight from XXX to ZZZ, 2 discrepancies were written up. One was a repeat item. The first item was the #1 start valve open light on in-flight (repeat item), and the other was #1 engine overheat light came on in-flight. I arrived in ZZZ approximately XA40. Talked to the flight crew and started working on the #1 engine start valve light problem until about XH00. The #1 engine overheat detection was an MEL item, so I called the maintenance controller. I was given the MEL and control numbers. I quickly read the MEL procedures and determined that the #1 norm/fire switch on the fire control panel should be placed in the fire position. While in-flight from ZZZ to YYY and at climb power, the #1 engine fire warning flickered then the throttles were pulled back to idle for the remainder of the flight. The fire switch should've been left in the normal position.
Original NASA ASRS Text
Title: A B737-200 WAS RELEASED FOR SVC WITH THE #1 ENG OVERHEAT WARNING SYS DEFERRED BUT THE LOOP SELECTOR SWITCH WAS POSITIONED IMPROPERLY IN CONFLICT WITH THE MEL.
Narrative: INFLT FROM XXX TO ZZZ, 2 DISCREPANCIES WERE WRITTEN UP. ONE WAS A REPEAT ITEM. THE FIRST ITEM WAS THE #1 START VALVE OPEN LIGHT ON INFLT (REPEAT ITEM), AND THE OTHER WAS #1 ENG OVERHEAT LIGHT CAME ON INFLT. I ARRIVED IN ZZZ APPROX XA40. TALKED TO THE FLC AND STARTED WORKING ON THE #1 ENG START VALVE LIGHT PROB UNTIL ABOUT XH00. THE #1 ENG OVERHEAT DETECTION WAS AN MEL ITEM, SO I CALLED THE MAINT CTLR. I WAS GIVEN THE MEL AND CTL NUMBERS. I QUICKLY READ THE MEL PROCS AND DETERMINED THAT THE #1 NORM/FIRE SWITCH ON THE FIRE CTL PANEL SHOULD BE PLACED IN THE FIRE POS. WHILE INFLT FROM ZZZ TO YYY AND AT CLB PWR, THE #1 ENG FIRE WARNING FLICKERED THEN THE THROTTLES WERE PULLED BACK TO IDLE FOR THE REMAINDER OF THE FLT. THE FIRE SWITCH SHOULD'VE BEEN LEFT IN THE NORMAL POS.
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.