<< >> NASA ASRS Report 653490, April 2005

A B737-300 arrived with the left engine leaking oil. Found 'B' nut at test port on engine finger tight. Aircraft just released from contract maintenance facility.

Attributes
ACN	653490
Time
Date	200504
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
Person 1
Affiliation	company : air carrier
Qualification	technician : powerplant technician : airframe
Experience	maintenance lead technician : 5 maintenance technician : 30
ASRS Report	653490
Person 2
Affiliation	other
Function	maintenance : technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	performance deficiency : scheduled maintenance performance deficiency : testing performance deficiency : non compliance with legal requirements performance deficiency : inspection
Supplementary
Problem Areas	Environmental Factor Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

Aircraft arrived as a through flight. Did walk around and found oil dripping from bottom of #1 engine. Bottom left hand of cowl was soaked with oil blowing back inside reverser cowl and out of the back. After engine run found oil leaking from 'B' nut at oil pressure switch under fan cowl 24 drops per minute. Found 'B' nut barely on. This aircraft just came out of a heavy check from contract facility in ZZZ. Per air carrier X policy; amt's need not to walk around aircraft on receive and dispatch trips; unless a check is assigned. Despite this; I walk around all aircraft. This is a safety issue. Mechanics are afraid to do walk arounds due to management retaliation. This 'B' nut I found loose is where you remove a line and connect a tester for the switch. This is done at heavy checks.

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Original NASA ASRS Text

Title: A B737-300 ARRIVED WITH THE L ENG LEAKING OIL. FOUND 'B' NUT AT TEST PORT ON ENG FINGER TIGHT. ACFT JUST RELEASED FROM CONTRACT MAINT FACILITY.

Narrative: ACFT ARRIVED AS A THROUGH FLT. DID WALK AROUND AND FOUND OIL DRIPPING FROM BOTTOM OF #1 ENG. BOTTOM L HAND OF COWL WAS SOAKED WITH OIL BLOWING BACK INSIDE REVERSER COWL AND OUT OF THE BACK. AFTER ENG RUN FOUND OIL LEAKING FROM 'B' NUT AT OIL PRESSURE SWITCH UNDER FAN COWL 24 DROPS PER MINUTE. FOUND 'B' NUT BARELY ON. THIS ACFT JUST CAME OUT OF A HEAVY CHK FROM CONTRACT FACILITY IN ZZZ. PER ACR X POLICY; AMT'S NEED NOT TO WALK AROUND ACFT ON RECEIVE AND DISPATCH TRIPS; UNLESS A CHK IS ASSIGNED. DESPITE THIS; I WALK AROUND ALL ACFT. THIS IS A SAFETY ISSUE. MECHANICS ARE AFRAID TO DO WALK AROUNDS DUE TO MGMNT RETALIATION. THIS 'B' NUT I FOUND LOOSE IS WHERE YOU REMOVE A LINE AND CONNECT A TESTER FOR THE SWITCH. THIS IS DONE AT HEAVY CHKS.

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.