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A B737-300 returned to the gate twice for #2 engine overheat warning. Found engine case to pneumatic duct elbow loose and leaking.
| Attributes | |
| ACN | 581715 |
| Time | |
| Date | 200305 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Qualification | technician : airframe technician : powerplant |
| ASRS Report | 581715 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 581941 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : company policies non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : #2 eng ovht detector |
| Resolutory Action | flight crew : diverted to another airport |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : repair performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : fault isolation |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
Aircraft came over to the hangar after its 2ND air return. It arrived right after shift change. We opened the engine cowl and #2 reverser cowl to troubleshoot a overheat problem. After checking the fire loop we determined it wasn't them. Then we pressurized the system using APU bleed while holding open the prsov valve -- no leaks were detected. About that time mr X came over and started looking. He then asked me (in humor) if that duct was supposed to be loose like that. I said probably not. I went to the engine shop to find the bolts, gasket, and safety wire tool. Took the loose clamp (shown in the picture) to make it easier to attach the duct to the case. After I got everything we needed, I installed the duct, safety wired the bolts, installed the clamp per maintenance manual.
Original NASA ASRS Text
Title: A B737-300 RETURNED TO THE GATE TWICE FOR #2 ENG OVERHEAT WARNING. FOUND ENG CASE TO PNEUMATIC DUCT ELBOW LOOSE AND LEAKING.
Narrative: ACFT CAME OVER TO THE HANGAR AFTER ITS 2ND AIR RETURN. IT ARRIVED RIGHT AFTER SHIFT CHANGE. WE OPENED THE ENG COWL AND #2 REVERSER COWL TO TROUBLESHOOT A OVERHEAT PROB. AFTER CHKING THE FIRE LOOP WE DETERMINED IT WASN'T THEM. THEN WE PRESSURIZED THE SYS USING APU BLEED WHILE HOLDING OPEN THE PRSOV VALVE -- NO LEAKS WERE DETECTED. ABOUT THAT TIME MR X CAME OVER AND STARTED LOOKING. HE THEN ASKED ME (IN HUMOR) IF THAT DUCT WAS SUPPOSED TO BE LOOSE LIKE THAT. I SAID PROBABLY NOT. I WENT TO THE ENG SHOP TO FIND THE BOLTS, GASKET, AND SAFETY WIRE TOOL. TOOK THE LOOSE CLAMP (SHOWN IN THE PICTURE) TO MAKE IT EASIER TO ATTACH THE DUCT TO THE CASE. AFTER I GOT EVERYTHING WE NEEDED, I INSTALLED THE DUCT, SAFETY WIRED THE BOLTS, INSTALLED THE CLAMP PER MAINT MANUAL.
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.