<< >> NASA ASRS Report 594537, September 2003

A dehavilland 8-200 left engine #1 propeller blade and retaining ring set was replaced. Later found incorrect retaining ring was installed.

Attributes
ACN	594537
Time
Date	200309
Day	Fri
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Dash 8-200
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Experience	maintenance technician : 19
ASRS Report	594537
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : inspection performance deficiency : non compliance with legal requirements performance deficiency : installation
Supplementary
Problem Areas	Aircraft Chart Or Publication Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

#1 propeller required #1 blade change. The retaining ring set also needed to be changed. The wrong type of retaining ring set was procured by the mechanic. I was the quality control inspector on the job and observed the retaining ring get installed. Later, it was discovered that the incorrect ring set was installed and it was changed at a line station. These ring sets are virtually identical and are distinguished by part number and class control number.

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Original NASA ASRS Text

Title: A DEHAVILLAND 8-200 L ENG #1 PROP BLADE AND RETAINING RING SET WAS REPLACED. LATER FOUND INCORRECT RETAINING RING WAS INSTALLED.

Narrative: #1 PROP REQUIRED #1 BLADE CHANGE. THE RETAINING RING SET ALSO NEEDED TO BE CHANGED. THE WRONG TYPE OF RETAINING RING SET WAS PROCURED BY THE MECH. I WAS THE QUALITY CTL INSPECTOR ON THE JOB AND OBSERVED THE RETAINING RING GET INSTALLED. LATER, IT WAS DISCOVERED THAT THE INCORRECT RING SET WAS INSTALLED AND IT WAS CHANGED AT A LINE STATION. THESE RING SETS ARE VIRTUALLY IDENTICAL AND ARE DISTINGUISHED BY PART NUMBER AND CLASS CTL NUMBER.

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.