A B737-700 was dispatched after release from a 'C' check. It was found later #2 engine did not have ...

Attributes
ACN	714788
Time
Date	200610
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
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
ASRS Report	714788
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	713902
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : far non adherence : published procedure
Independent Detector	other other : 5
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure contributing factor : work cards performance deficiency : inspection performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : scheduled maintenance performance deficiency : unqualified personnel performance deficiency : training performance deficiency : installation
Supplementary
Problem Areas	Aircraft Environmental Factor Maintenance Human Performance Chart Or Publication
Primary Problem	Maintenance Human Performance

Narrative:

3 mechanics and an inspector were working blade lube on #2 engine. The 3 of us mechanics had very limited experience with B737-700 blade removal-installation. I had mentioned our inexperience to the inspector and asked him to watch us closely. I was in the inlet doing the removal; with the others on cleaning and inspection of blade parts. After cleaning and lubing of the banana clips they were put in a box for installation. I was installing the parts as they were handed to me. The banana clips were still in the box; apparently out of sight; and I didn't notice they were missing. After the installation was complete; I notice that when I would spin the blades they would stop and make a slight turn in reverse. I knew that wasn't normal and mentioned it to the inspector and my lead. We decided to see how the engine vibration run looked. After they ran the engines; I talked to the runway guys and they said everything looked good. I looked at the blades and the reverse spin had stopped. I'm not sure if that had to do with the missing parts; I'm guessing now it probably did; but since it stopped; I assumed it was due to heavy lubing. The aircraft left that morning and flew for the day. That night a mechanic found the box of clips on the blade stand and questioned why they were there. After a little investigating it was determined they were left out and the plane was then grounded. Mechanics were sent to check the engine and it was found no damage had occurred to the hub. The blades were then changed and new banana clips were installed. I was notified of the problem the morning of oct/xa/06. The plane was then released to service. Looking back on the process I can see where we should have done things different and how I should have been alerted to something wrong. I should have done what I usually do when doing a new job. Lay the parts in relative order of installation; as much as possible.

Original NASA ASRS Text

Title: A B737-700 WAS DISPATCHED AFTER RELEASE FROM A 'C' CHK. IT WAS FOUND LATER #2 ENG DID NOT HAVE FAN BLADE SPACERS INSTALLED AFTER THE FAN LUBRICATION.

Narrative: 3 MECHS AND AN INSPECTOR WERE WORKING BLADE LUBE ON #2 ENG. THE 3 OF US MECHS HAD VERY LIMITED EXPERIENCE WITH B737-700 BLADE REMOVAL-INSTALLATION. I HAD MENTIONED OUR INEXPERIENCE TO THE INSPECTOR AND ASKED HIM TO WATCH US CLOSELY. I WAS IN THE INLET DOING THE REMOVAL; WITH THE OTHERS ON CLEANING AND INSPECTION OF BLADE PARTS. AFTER CLEANING AND LUBING OF THE BANANA CLIPS THEY WERE PUT IN A BOX FOR INSTALLATION. I WAS INSTALLING THE PARTS AS THEY WERE HANDED TO ME. THE BANANA CLIPS WERE STILL IN THE BOX; APPARENTLY OUT OF SIGHT; AND I DIDN'T NOTICE THEY WERE MISSING. AFTER THE INSTALLATION WAS COMPLETE; I NOTICE THAT WHEN I WOULD SPIN THE BLADES THEY WOULD STOP AND MAKE A SLIGHT TURN IN REVERSE. I KNEW THAT WASN'T NORMAL AND MENTIONED IT TO THE INSPECTOR AND MY LEAD. WE DECIDED TO SEE HOW THE ENG VIBRATION RUN LOOKED. AFTER THEY RAN THE ENGS; I TALKED TO THE RWY GUYS AND THEY SAID EVERYTHING LOOKED GOOD. I LOOKED AT THE BLADES AND THE REVERSE SPIN HAD STOPPED. I'M NOT SURE IF THAT HAD TO DO WITH THE MISSING PARTS; I'M GUESSING NOW IT PROBABLY DID; BUT SINCE IT STOPPED; I ASSUMED IT WAS DUE TO HVY LUBING. THE ACFT LEFT THAT MORNING AND FLEW FOR THE DAY. THAT NIGHT A MECH FOUND THE BOX OF CLIPS ON THE BLADE STAND AND QUESTIONED WHY THEY WERE THERE. AFTER A LITTLE INVESTIGATING IT WAS DETERMINED THEY WERE LEFT OUT AND THE PLANE WAS THEN GNDED. MECHS WERE SENT TO CHK THE ENG AND IT WAS FOUND NO DAMAGE HAD OCCURRED TO THE HUB. THE BLADES WERE THEN CHANGED AND NEW BANANA CLIPS WERE INSTALLED. I WAS NOTIFIED OF THE PROB THE MORNING OF OCT/XA/06. THE PLANE WAS THEN RELEASED TO SVC. LOOKING BACK ON THE PROCESS I CAN SEE WHERE WE SHOULD HAVE DONE THINGS DIFFERENT AND HOW I SHOULD HAVE BEEN ALERTED TO SOMETHING WRONG. I SHOULD HAVE DONE WHAT I USUALLY DO WHEN DOING A NEW JOB. LAY THE PARTS IN RELATIVE ORDER OF INSTALLATION; AS MUCH AS POSSIBLE.

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 was dispatched after release from a 'C' check. It was found later #2 engine did not have fan blade spacers installed after the fan lubrication.