<< >> NASA ASRS Report 775520, February 2008

After performing a grease leak inspection on a #2 engine propeller; a dehavilland dhc-8-400 mechanic is informed of having left his 5/16 inch allen socket inside the propeller spinner. Found at downline station.

Attributes
ACN	775520
Time
Date	200802
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Q400 (Formerly Dash 8-400)
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
ASRS Report	775520
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far non adherence : company policies
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	performance deficiency : installation performance deficiency : non compliance with legal requirements performance deficiency : scheduled maintenance performance deficiency : inspection
Supplementary
Problem Areas	Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

During my shift; performed a grease leak inspection on #2 propeller. After servicing the propeller hub with oil; I installed the hub bolt in accordance with the maintenance manual. After tightening the hub bolt and removing tools from the propeller; the 5/16 inch allen head socket must have stuck inside the head of the bolt. Rattling noise was discovered at ZZZ1 gate. Mechanic removed spinner and discovered the tool inside. Organized tools better to be better aware of where tools are at all times. Didn't check for all tools after finishing the task. Did not verify area around the propeller was clear. Tools are better organized and inventoried after each task and before plane is dispatched. Doublechk surroundings after tasks are completed for tools or FOD.

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Original NASA ASRS Text

Title: AFTER PERFORMING A GREASE LEAK INSPECTION ON A #2 ENG PROPELLER; A DEHAVILLAND DHC-8-400 MECHANIC IS INFORMED OF HAVING LEFT HIS 5/16 INCH ALLEN SOCKET INSIDE THE PROP SPINNER. FOUND AT DOWNLINE STATION.

Narrative: DURING MY SHIFT; PERFORMED A GREASE LEAK INSPECTION ON #2 PROP. AFTER SVCING THE PROP HUB WITH OIL; I INSTALLED THE HUB BOLT IN ACCORDANCE WITH THE MAINT MANUAL. AFTER TIGHTENING THE HUB BOLT AND REMOVING TOOLS FROM THE PROP; THE 5/16 INCH ALLEN HEAD SOCKET MUST HAVE STUCK INSIDE THE HEAD OF THE BOLT. RATTLING NOISE WAS DISCOVERED AT ZZZ1 GATE. MECH REMOVED SPINNER AND DISCOVERED THE TOOL INSIDE. ORGANIZED TOOLS BETTER TO BE BETTER AWARE OF WHERE TOOLS ARE AT ALL TIMES. DIDN'T CHK FOR ALL TOOLS AFTER FINISHING THE TASK. DID NOT VERIFY AREA AROUND THE PROP WAS CLR. TOOLS ARE BETTER ORGANIZED AND INVENTORIED AFTER EACH TASK AND BEFORE PLANE IS DISPATCHED. DOUBLECHK SURROUNDINGS AFTER TASKS ARE COMPLETED FOR TOOLS OR FOD.

Data retrieved from NASA's ASRS site as of May 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.