A B737-700 aircraft required air turn back due to engine overheat after #2 engine and high press tur...

Attributes
ACN	749902
Time
Date	200706
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
ASRS Report	749902
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	other
Factors
Maintenance	performance deficiency : scheduled maintenance performance deficiency : installation
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

Aircraft air-returned to ZZZ for a crew reported engine overheat on #2 engine. This aircraft had just had #2 engine changed prior to this flight. At the start of my shift; I volunteered to work with the engine changer crew. The received svcable engine had the high pressure turbine clearance control valve robbed prior to being shipped to us. I installed the replacement valve per the maintenance manual and the leak check and operations check were conducted during the ground runs after the engine change was complete. I was very methodical during the valve installation. I was told that after the air turn-back; no leaks could be located that would cause the overheat condition. The following shift of maintenance decided that since the high pressure turbine clearance control valve was the only port installed; that the seals should be doublechked. I was told that all seals were in position and one was suspect to leaking and changed. This resolved the overheat condition.

Original NASA ASRS Text

Title: A B737-700 ACFT REQUIRED AIR TURN BACK DUE TO ENG OVERHEAT AFTER #2 ENGINE AND HIGH PRESS TURBINE CLEARANCE CONTROL VALVE (HPTCCV) WAS REPLACED.

Narrative: ACFT AIR-RETURNED TO ZZZ FOR A CREW RPTED ENG OVERHEAT ON #2 ENG. THIS ACFT HAD JUST HAD #2 ENG CHANGED PRIOR TO THIS FLT. AT THE START OF MY SHIFT; I VOLUNTEERED TO WORK WITH THE ENG CHANGER CREW. THE RECEIVED SVCABLE ENG HAD THE HIGH PRESSURE TURBINE CLRNC CTL VALVE ROBBED PRIOR TO BEING SHIPPED TO US. I INSTALLED THE REPLACEMENT VALVE PER THE MAINT MANUAL AND THE LEAK CHK AND OPS CHK WERE CONDUCTED DURING THE GND RUNS AFTER THE ENG CHANGE WAS COMPLETE. I WAS VERY METHODICAL DURING THE VALVE INSTALLATION. I WAS TOLD THAT AFTER THE AIR TURN-BACK; NO LEAKS COULD BE LOCATED THAT WOULD CAUSE THE OVERHEAT CONDITION. THE FOLLOWING SHIFT OF MAINT DECIDED THAT SINCE THE HIGH PRESSURE TURBINE CLRNC CTL VALVE WAS THE ONLY PORT INSTALLED; THAT THE SEALS SHOULD BE DOUBLECHKED. I WAS TOLD THAT ALL SEALS WERE IN POS AND ONE WAS SUSPECT TO LEAKING AND CHANGED. THIS RESOLVED THE OVERHEAT CONDITION.

Data retrieved from NASA's ASRS site as of January 2009 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.

A B737-700 aircraft required air turn back due to engine overheat after #2 engine and high press turbine clearance control valve (hptccv) was replaced.