A DC9-30 was dispatched in non compliance with the right engine oil filler cap not installed.

Attributes
ACN	604307
Time
Date	200401
Day	Wed
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	DC-9 30
Person 1
Affiliation	company : air carrier
Qualification	technician : powerplant technician : airframe
Experience	maintenance repairman : 24
ASRS Report	604307
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : far non adherence : published procedure non adherence : company policies
Independent Detector	aircraft equipment other aircraft equipment : r engine oil quantity ind.
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure contributing factor : tooling performance deficiency : scheduled maintenance performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : installation performance deficiency : inspection
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Weather
Primary Problem	Maintenance Human Performance

Narrative:

After changing the #1 engine main oil filter, I did the filter leak check. The wind was blowing upwards of 20 mph. The temperature was below zero with the wind chill. I installed the cowling support struts to keep from damaging the cowling and aircraft. I then removed the engine oil cap, svced the engine. I heard mechanic trying to close his cowling. I got off my ladder to give him a hand. It took a couple of mins, had a problem with a latch and wind. We then came over to my side, secured the struts. The wind was bad on my side, we fought to close the cowling. The next day, I came to work and found out an oil cap was left off an engine on aircraft. I was sure I installed mine. I then found out it was the engine I worked. I then thought of all that took place, getting off the ladder, helping mechanic fighting the WX. I can honestly say, I can't say one way or the other if I installed the cap for sure.

Original NASA ASRS Text

Title: A DC9-30 WAS DISPATCHED IN NON COMPLIANCE WITH THE R ENG OIL FILLER CAP NOT INSTALLED.

Narrative: AFTER CHANGING THE #1 ENG MAIN OIL FILTER, I DID THE FILTER LEAK CHK. THE WIND WAS BLOWING UPWARDS OF 20 MPH. THE TEMP WAS BELOW ZERO WITH THE WIND CHILL. I INSTALLED THE COWLING SUPPORT STRUTS TO KEEP FROM DAMAGING THE COWLING AND ACFT. I THEN REMOVED THE ENG OIL CAP, SVCED THE ENG. I HEARD MECH TRYING TO CLOSE HIS COWLING. I GOT OFF MY LADDER TO GIVE HIM A HAND. IT TOOK A COUPLE OF MINS, HAD A PROB WITH A LATCH AND WIND. WE THEN CAME OVER TO MY SIDE, SECURED THE STRUTS. THE WIND WAS BAD ON MY SIDE, WE FOUGHT TO CLOSE THE COWLING. THE NEXT DAY, I CAME TO WORK AND FOUND OUT AN OIL CAP WAS LEFT OFF AN ENG ON ACFT. I WAS SURE I INSTALLED MINE. I THEN FOUND OUT IT WAS THE ENG I WORKED. I THEN THOUGHT OF ALL THAT TOOK PLACE, GETTING OFF THE LADDER, HELPING MECH FIGHTING THE WX. I CAN HONESTLY SAY, I CAN'T SAY ONE WAY OR THE OTHER IF I INSTALLED THE CAP FOR SURE.

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.